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# 920-345 BCM50/450 Rls. 5.0 Installation and(R) Initial Configuration

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920-345 exam Dumps Source : BCM50/450 Rls. 5.0 Installation and(R) Initial Configuration

Test Code : 920-345
Test title : BCM50/450 Rls. 5.0 Installation and(R) Initial Configuration
Vendor title : Nortel
: 110 actual Questions

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# Nortel BCM50/450 Rls. 5.0 Installation

### latest Nortel software unencumber presents SMBs unusual ranges of Simplicity and Unified Communications | killexams.com actual Questions and Pass4sure dumps

common software stream gives finished, low-budget, and Scalable solution across platforms and into department places of work

TORONTO, ONTARIO--(Marketwire - Nov. 3, 2009) - miniature and medium-sized companies (SMBs) can acquire productiveness, charge-rate reductions and the funding protection essential to success in trendy company ambiance with unusual unified communications-based mostly (UC) software from Nortel* (OTCBB:NRTLQ). The latest application release 5.0 for Nortel's award-successful enterprise Communications supervisor (BCM) provides unusual UC capabilities, together with unified presence, and enhanced simplicity with the introduction of a typical application stream for BCM50 and BCM450.

The Nortel BCM450 and BCM50 are Linux-primarily based IP/TDM PBXs delivering application-wealthy, all-in-one options for converged voice and data communications. The BCM50 serves businesses with as much as 50 users while the better skill BCM450 is rectify for becoming medium to gargantuan agencies and department offices with as much as 300 users. each and every helps a admixture of IP and digital consumers and can enable firms to retain as much as 70 % of their proper funding by reusing current gadget.

As a section of the unusual BCM Rls 5.0 utility, BCM450 and BCM50 provide SMBs with dynamic UC aspects fancy InTouch, which grants prerogative federated presence, and familiar built-in communications functions and capabilities. InTouch lets users speak readily with any one in their own directory – across Microsoft Outlook, Nortel BCM, MSN, and Skype for click-to-call, click-to-IM, and click-to-e-mail. by means of connecting americans quicker, improving collaboration and speeding up the time to choice, Nortel estimates that unified communications can back organizations understand charge-savings and a tower in productivity of up to 18 percent.

ultimate year, the Nashville conference and company Bureau** (NCVB) leveraged its BCM450 solution to booklet more than 650,000 inn rooms while advertising and marketing tourism on behalf of a number of partners. NCVB is now trialing BCM Rls 5.0 and plans to roll out the InTouch application within the coming weeks. Kay Hopwood, NCVB's director of tips technology, is longing for seeing true-time presence for every person on the network and having a view into overlooked calls even when a caller doesn't slip away a voicemail. For now, NCVB is having fun with the primary BCM Rls 5.0 feature it deployed, FindMe/FollowMe (FMFM), which allows simultaneous ringing of up to 5 additional exterior gadgets. "every title is competencies business," pointed out Hopwood. "With BCM's FindMe/FollowMe ability, their earnings team on no account has to omit an additional salary-producing title once again."

Minitel**, a premier Nortel associate presenting provider throughout Canada, additionally selected to crucible BCM Rls 5.0 in its personal workplace creation equipment. Its Toronto vp of Operations, Dan Silverman, was so completely gratified with the progress of the in-apartment crucible he satisfied a Big accounting enterprise customer to deploy it as smartly. "The installing changed into as smooth as could subsist and the customer is now rolling out each InTouch and FindMe/FollowMe to discrete users of their company comfortably. They were able to procure their customer up to pace on the interface and rolling the application out via themselves in below an hour," pointed out Silverman.

Mexico's Universidad Latinoamericana** (ULA) in a similar way confirmed the latest BCM software with wonderful consequences. "we are within the enterprise of training modern day adolescence and making ready them for the longer term and the challenges forward," said Mario Ahumada Sandoval, subdirector of techniques, ULA. "To consequence so, they count number on having the newest in communications expertise that helps us offer a wealthy UC adventure for cadaver of workers and college students. Trialling BCM Rls 5.0, they institute that the product's unusual characteristic set enhances their UC journey, while maximizing gadget already in place."

BCM50 client, Philkeram-Johnson**, the oldest ceramic tile producer in Greece, additionally welcomed the unusual application free up. "Our Nortel BCM50 gives us room to grow, when it comes to capacity and performance, and it grants the features they deserve to evolve to a unified communications ambiance," pointed out Christos Syropoulos, commercial manager, Philkeram-Johnson. "we're constantly seeking methods to enhance their products and their productiveness in order to respond greater immediately to valued clientele. i am enthusiastic to find out extra concerning the unusual elements obtainable in BCM Rls 5.0 and the way they can employ them to raise their communications."

in addition to the InTouch and FMFM capabilities, BCM Rls 5.0 lets a consumer ahead a voice message the usage of a file so that it can subsist performed or examine by any cellular machine on this planet. Meet-Me Conferencing for BCM now gives as much as one hundred twenty five ports with assist for as many as 300 users. skilled summon Recording, a capacity customarily presented through a third party is too available as section of the newest BCM release.

As a further capacity of streamlining charges and operations making it much more benchmark for SMBs and Nortel channel companions to install, provision, and migrate pre-latest information, the brand unusual BCM50 and BCM450 portfolio includes common application and purposes, O/S, practicing, accreditation, consumer interfaces, and documentation.

Dell'Oro ranks Nortel's SMB portfolio #1 on this planet in number of hybrid-IP strains shipped and #2 in SMB market revenue for the second quarter 2009. Nortel's BCM solutions are localized and bought in over a hundred and twenty nations through more than 1000 channels.

Hear from more BCM clients and partners:

• "FindMe/FollowMe and Message Forwarding enable constitution Telecom's** income and technical workforce to subsist more obtainable to their valued clientele, whether in the workplace or on the street. With the capability for individual users to personalize these elements to their liking through an internet-based GUI utensil Mailbox supervisor. Their device administrator now not has to execute each day adjustments. FMFM and the means to seamlessly switch calls between their desk phones and cellular phones has additionally allowed us to reduce their charges, give their cadaver of workers with extra flexibility, and boost their availability to clients." – David Harper, voice systems engineer, constitution Telecom - Canada
• "Our office communications subsist pleased been based mostly solely on Nortel's BCM methods for years. They lately upgraded to the newest BCM technology, preserving most of their preliminary investment in hardware and everyone the funding in application licenses. the unusual UC performance increases their productiveness and saves time. It too allows for us to connect to other techniques fancy Communications Server one thousand and Microsoft OCS. With InTouch they are in a position to maneuver their online contacts at MSN and Skype from a single utility interface in MS Outlook, together with their workplace colleagues, consumers, and companions." – Nikos Koulioumbis, SMB options director, UniNortel SA** - Greece
• "creative unusual points such as InTouch with federated presence, FindMe/FollowMe, professional title Recording and enhanced CTI purposes are everyone notable productiveness enhancers if you want to shop agencies time and cash and this truly resonated with the customers they talked to at a contemporaneous seminar held in Nortel's Maidenhead office. They had enthusiastic remarks from attendees together with a London-based voice and information solutions issuer who talked about he most enjoyed the portion of the seminar that focused on BCM Rls 5.0." – Thomas Jacques, managing director, 1st Communications** - UK
• "The BCM product has at everyone times been one that we've been haughty to offer to their purchasers as a result of its converged voice and records reply for miniature and medium corporations. As a longtime channel accomplice of Nortel's in Mexico, they appear ahead to being in a position to present those equal facets, besides newly more advantageous ones with the unusual software release of BCM Rls 5.0 with unusual points reminiscent of FindMeFollowMe, professional title Recording, and stronger CTI applications on the way to expand their consumer's productiveness." – Jorge Alberto Jimenez Hernandez, director of engineering, Innovaciones Telemáticas, S.A. de C.V.** (INTELEMATICA) - Mexico

Nortel promises communications capabilities that execute the pledge of enterprise Made simple a truth for their consumers. Their subsequent-generation applied sciences, for each service issuer and enterprise networks, back multimedia and company-essential purposes. Nortel's applied sciences are designed to back procure rid of modern limitations to efficiency, velocity and performance by way of simplifying networks and connecting individuals to the tips they want, once they necessity it. For more guidance, visit Nortel on the net at www.nortel.com. For the newest Nortel information, consult with www.nortel.com/news.

certain statements in this press liberate can too contain phrases such as "could", "expects", "can also", "anticipates", "believes", "intends", "estimates", "objectives", "envisions", "seeks" and different identical language and are regarded ahead-looking statements or counsel beneath applicable securities law. These statements are in accordance with Nortel's existing expectations, estimates, forecasts and projections about the operating atmosphere, economies and markets during which Nortel operates. These statements are discipline to necessary assumptions, dangers and uncertainties, that are complex to augur and the precise consequence can subsist materially diverse from those pondered in forward-looking statements. For additional information with recognize to inevitable of these and different elements, espy Nortel's Annual file on Form10-ok, Quarterly studies on kindly 10-Q and other securities filings with the SEC. until in any other case required by using applicable securities laws, Nortel disclaims any aim or duty to update or revise any ahead-looking statements, even if as a result of unusual tips, future routine or in any other case.

*Nortel, the Nortel brand and the Globemark are trademarks of Nortel Networks.

**here is a third birthday celebration hyperlink as described in their internet linking practices.

Use of the terms "companion" and "partnership" doesn't suggest a felony partnership between Nortel and another birthday party.

### latest Nortel utility unencumber presents SMBs unusual degrees of Simplicity and Unified Communications | killexams.com actual Questions and Pass4sure dumps

TORONTO, ONTARIO -- (Marketwire) -- 11/03/09 -- miniature and medium-sized corporations (SMBs) can obtain productiveness, can charge-mark downs and the investment coverage vital to success in trendy company atmosphere with unusual unified communications-based (UC) software from Nortel(1) (OTCBB: NRTLQ). The newest software free up 5.0 for Nortel's award-profitable enterprise Communications supervisor (BCM) provides unusual UC capabilities, together with unified presence, and enhanced simplicity with the introduction of a common software circulate for BCM50 and BCM450.

The Nortel BCM450 and BCM50 are Linux-primarily based IP/TDM PBXs delivering utility-wealthy, all-in-one options for converged voice and records communications. The BCM50 serves companies with up to 50 users while the larger talent BCM450 is suitable for growing to subsist medium to giant companies and department workplaces with as much as 300 clients. each and every helps a blend of IP and digital consumers and may allow establishments to retain up to 70 p.c of their habitual investment by means of reusing latest device.

As a section of the unusual BCM Rls 5.0 utility, BCM450 and BCM50 supply SMBs with dynamic UC facets fancy InTouch, which promises actual federated presence, and everyday built-in communications applications and capabilities. InTouch lets users communicate comfortably with any one in their very own listing - throughout Microsoft Outlook, Nortel BCM, MSN, and Skype for click on-to-name, click-to-IM, and click on-to-email. by using connecting people faster, improving collaboration and dashing up the time to decision, Nortel estimates that unified communications can back corporations recognize charge-rate reductions and a tower in productiveness of as much as 18 p.c.

closing 12 months, the Nashville convention and friends Bureau(2) (NCVB) leveraged its BCM450 reply to book more than 650,000 hotel rooms while marketing tourism on behalf of quite a lot of partners. NCVB is now trialing BCM Rls 5.0 and plans to roll out the InTouch application within the coming weeks. Kay Hopwood, NCVB's director of tips technology, is longing for seeing precise-time presence for everybody on the community and having a view into missed calls even when a caller doesn't depart a voicemail. For now, NCVB is enjoying the first BCM Rls 5.0 office it deployed, FindMe/FollowMe (FMFM), which enables simultaneous ringing of up to 5 extra exterior devices. "every summon is talents company," notable Hopwood. "With BCM's FindMe/FollowMe skill, their revenue crew certainly not has to miss an additional income-generating title again."

Minitel(2), a premier Nortel accomplice featuring carrier throughout Canada, additionally selected to crucible BCM Rls 5.0 in its own office creation equipment. Its Toronto vice chairman of Operations, Dan Silverman, was so gratified with the progress of the in-house crucible he satisfied a big accounting company client to install it as smartly. "The installing changed into as antiseptic as may subsist and the client is now rolling out each InTouch and FindMe/FollowMe to distinctive clients in their organization with ease. They had been in a position to procure their client up to velocity on the interface and rolling the software out by using themselves in below an hour," observed Silverman.

Mexico's Universidad Latinoamericana(2) (ULA) in a similar way proven the latest BCM application with fine consequences. "we're within the commerce of educating cutting-edge youth and getting ready them for the long rush and the challenges forward," observed Mario Ahumada Sandoval, subdirector of techniques, ULA. "To accomplish that, they count number on having the latest in communications technology that helps us present a wealthy UC journey for cadaver of workers and college students. Trialling BCM Rls 5.0, they institute that the product's unusual characteristic set enhances their UC adventure, whereas maximizing materiel already in region."

BCM50 customer, Philkeram-Johnson(2), the oldest ceramic tile producer in Greece, too welcomed the brand unusual application release. "Our Nortel BCM50 gives us room to grow, when it comes to means and performance, and it delivers the features they should evolve to a unified communications ambiance," observed Christos Syropoulos, industrial supervisor, Philkeram-Johnson. "we're consistently searching for simple methods to boost their products and their productivity so they can reply more quickly to purchasers. i am desirous to discover more concerning the unusual facets purchasable in BCM Rls 5.0 and the way they can employ them to expand their communications."

besides the InTouch and FMFM capabilities, BCM Rls 5.0 lets a user forward a voice message using a file in order that it can too subsist played or read through any cellular materiel on earth. Meet-Me Conferencing for BCM now offers up to one hundred twenty five ports with assist for as many as 300 clients. expert title Recording, a talent usually provided by way of a 3rd birthday party is too purchasable as section of the latest BCM unencumber.

As an additional talent of streamlining prices and operations making it much more essential for SMBs and Nortel channel companions to set up, provision, and migrate pre-latest information, the brand unusual BCM50 and BCM450 portfolio contains commonplace software and functions, O/S, working towards, accreditation, person interfaces, and documentation.

Dell'Oro ranks Nortel's SMB portfolio #1 on the earth in variety of hybrid-IP lines shipped and #2 in SMB market salary for the second quarter 2009. Nortel's BCM solutions are localized and sold in over a hundred and twenty international locations through greater than one thousand channels.

Hear from greater BCM users and companions:

- "FindMe/FollowMe and Message Forwarding allow constitution Telecom's(2) income and technical cadaver of workers to subsist greater obtainable to their valued clientele, no matter if within the office or on the road. With the capacity for particular person users to customise these features to their liking through a web-primarily based GUI utensil Mailbox manager. Their materiel administrator no longer has to execute each day changes. FMFM and the capability to seamlessly transfer calls between their desk phones and cellular telephones has too allowed us to lessen their costs, deliver their workforce with extra flexibility, and expand their availability to consumers." - David Harper, voice systems engineer, constitution Telecom - Canada

- "Our office communications were based mostly exclusively on Nortel's BCM methods for years. They currently upgraded to the newest BCM expertise, retaining most of their preliminary funding in hardware and everyone of the funding in application licenses. the brand unusual UC functionality raises their productivity and saves time. It too allows us to hook up with different systems fancy Communications Server one thousand and Microsoft OCS. With InTouch they are in a position to manage their on-line contacts at MSN and Skype from a single application interface in MS Outlook, along with their office colleagues, consumers, and partners." - Nikos Koulioumbis, SMB solutions director, UniNortel SA(2) - Greece

- "imaginative unusual facets such as InTouch with federated presence, FindMe/FollowMe, professional title Recording and greater CTI applications are everyone notable productivity enhancers that will reclaim agencies time and money and this definitely resonated with the customers they talked to at a fresh seminar held in Nortel's Maidenhead office. They had enthusiastic remarks from attendees including a London-based mostly voice and information solutions provider who spoke of he most enjoyed the component of the seminar that focused on BCM Rls 5.0." - Thomas Jacques, managing director, 1st Communications(2) - UK

- "The BCM product has everyone the time been one that we've been haughty to present to their customers due to its converged voice and statistics reply for miniature and medium groups. As a longtime channel confederate of Nortel's in Mexico, they notice ahead to being able to present these identical facets, moreover newly more advantageous ones with the unusual software unlock of BCM Rls 5.0 with unusual facets equivalent to FindMeFollowMe, knowledgeable summon Recording, and improved CTI purposes if you want to boost their customer's productiveness." - Jorge Alberto Jimenez Hernandez, director of engineering, Innovaciones Telematicas, S.A. de C.V.(2) (INTELEMATICA) - Mexico

Nortel promises communications capabilities that execute the pledge of company Made essential a reality for their shoppers. Their next-generation technologies, for each service company and commercial enterprise networks, assist multimedia and enterprise-critical functions. Nortel's technologies are designed to attend procure rid of ultra-modern barriers to efficiency, pace and efficiency by using simplifying networks and connecting individuals to the tips they want, once they want it. For greater information, talk over with Nortel on the web at www.nortel.com. For the newest Nortel news, visit www.nortel.com/news.

certain statements in this press free up may comprise phrases equivalent to "might", "expects", "may additionally", "anticipates", "believes", "intends", "estimates", "pursuits", "envisions", "seeks" and other equivalent language and are regarded ahead-looking statements or guidance beneath relevant securities legislations. These statements are in response to Nortel's latest expectations, estimates, forecasts and projections about the working atmosphere, economies and markets through which Nortel operates. These statements are region to critical assumptions, dangers and uncertainties, that are tricky to augur and the specific consequence could subsist materially diverse from those contemplated in ahead-searching statements. For more information with prize to Definite of these and other factors, espy Nortel's Annual document on Form10-ok, Quarterly studies on kindly 10-Q and other securities filings with the SEC. except otherwise required by means of applicable securities legal guidelines, Nortel disclaims any aim or responsibility to update or revise any ahead-searching statements, no matter if because of unusual guidance, future hobbies or in any other case.

(1)Nortel, the Nortel logo and the Globemark are trademarks of Nortel Networks.

(2)here is a third celebration hyperlink as described in their internet linking practices.

Use of the phrases "associate" and "partnership" doesn't suggest a legal partnership between Nortel and some other party.

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# BCM50/450 Rls. 5.0 Installation and(R) Initial Configuration

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### Atomic-level insight into super-efficient electrocatalytic oxygen evolution on iron and vanadium co-doped nickel (oxy)hydroxide | killexams.com actual questions and Pass4sure dumps

Fabrication and characterization of Ni3Fe1−xVx

A train of Ni3Fe1−xVx (oxy)hydroxide catalysts (0 ≤ x ≤ 1), namely Ni3Fe, Ni3V, Ni3Fe0.67V0.33, Ni3Fe0.5V0.5, Ni3Fe0.33V0.67, and unadulterated Ni (oxy)hydroxides were directly grown on hydrophilic CFPs by hydrothermal synthesis (Fig. 1 and Supplementary Fig. 1). The atomic ratios of different metals in the as-prepared catalysts were determined by analyses of inductively coupled plasma optical emission spectroscopy (ICP-OES, Supplementary Table 1).

Fig. 1

Fabrication of Ni3Fe1‒xVx/CFP O2-evolving electrodes. Schematic illustration of the fabrication procedure by directly growing Ni3Fe1‒xVx NSs on a pretreated CFP substrate

The powder X-ray diffraction (PXRD) patterns (Supplementary Fig. 2) testify that Ni3Fe1−xVx are isostructural to α-Ni(OH)2 (JCPDS Card No. 38-0715). The reflections at 2θ = 11.4° and 22.7°, corresponding to the (003) and (006) lattice planes of Ni3Fe1−xVx, slightly shift to larger 2θ values by 0.2° and 0.6°, respectively, relative to those of α-Ni(OH)2. The d-spacing values obtained from the (003) and (006) reflections are about 7.65 and 3.81 Å, respectively, with a miniature contraction compared to those for unadulterated α-Ni(OH)2 (d(003) = 7.79 Å and d(006) = 3.91 Å), which is most possibly caused by the substitution of Fe and V atoms for Ni in the lattice sites of the Ni(OH)2 matrix32,39,40. Because no extra diffraction peaks are observed in the PXRD pattern, it could subsist deduced that no separated crystalline phases, such as unary Ni-, Fe-, or V-based oxides/(oxy)hydroxides, are formed during the doping process12,28,41.

Scanning electron microscopic (SEM) images of Ni3Fe0.5V0.5/CFP (Fig. 2a) clearly testify that the entire surface of each carbon fiber is uniformly coated with the densely interlaced NSs, forming a sharp contrast to the smooth surface of pristine carbon fibers (Supplementary Fig. 3). A nigh inspection (Fig. 2b) reveals that the interlaced NSs form a porous network structure. Such an open nanoarchitecture built by Ni3Fe0.5V0.5 ultrathin NSs would afford a mass of electrochemically dynamic sites, an simple penetration of electrolyte, and a profitable mechanical strength, so as to better the OER activity and stability of the electrodes4. The quantitative SEM energy dispersive X-ray spectrum (SEM-EDX) of Ni3Fe0.5V0.5/CFP discloses the presence of Ni, Fe, V, and O elements with a Ni/Fe/V atomic ratio of 74.12:12.83:13.05, which is nigh to the stoichiometric metal ratio of Ni/Fe/V = 3:0.5:0.5. Moreover, the corresponding elemental mappings (Supplementary Fig. 4) illustrate that the Ni, Fe, V, and O elements distribute homogenously on the surface of carbon fibers.

Fig. 2

Microscopy measurements of Ni3Fe0.5V0.5 NSs. a, b Top-view SEM images of the carbon fiber coated with Ni3Fe0.5V0.5 NSs with low (a) and high (b) magnification. Scale bars, 1 μm in a and 100 nm in b. The inset in a shows the hierarchically structured 3D integrated electrode. Scale bar in the inset in a, 5 μm. c, d TEM images of Ni3Fe0.5V0.5 NSs scratched off from the as-prepared CFP electrode. Scale bars, 100 nm in c and 40 nm in d.e Atomic-resolution BF-TEM image of Ni3Fe0.5V0.5 NSs. Scale bar, 1 nm. f Aberration-corrected HAADF-STEM image of Ni3Fe0.5V0.5 NSs, the corresponding EDX elemental mappings of Ni, Fe, V, O and the mixed elemental mapping of Ni, Fe, V, and O. Scale bar, 2 nm

The bright-field TEM (BF-TEM) image (Fig. 2c) of Ni3Fe0.5V0.5 NSs illustrates a rippled sheet structure with a dimension around 500 nm, and the lateral TEM image (Fig. 2d) shows the ultrathin Ni3Fe0.5V0.5 NSs with the thickness of 2.7–4.2 nm. Furthermore, the atomic-resolution BF-TEM image (Fig. 2e) displays lucid lattice fringes with an interplanar spacing of 2.67 Å, indexed to the (101) plane of Ni3Fe0.5V0.5 NSs. The interplanar spacing of lattice fringes is slightly smaller than that of α-Ni(OH)2 (2.68 Å) due to the doping of Fe and V for Ni in Ni(OH)2 lattices. single atoms, clusters, and miniature particles of Fe and V species are not observed in aberration-corrected high-angle annular dark-field scanning TEM (HAADF-STEM) images of Ni3Fe0.5V0.5 NSs (Supplementary Fig. 5). Meanwhile, both the EDX elemental mappings and linear scanning analysis of the HAADF-STEM image of Ni3Fe0.5V0.5 NSs with sub-nanometer resolution (Fig. 2f and Supplementary Fig. 6) provide direct-viewing evidence for the uniform distribution of Ni, Fe, V, and O elements in the as-prepared NSs.

In order to clarify the occupation sites of Fe and V dopants in Ni(OH)2 lattices, they pomp in Fig. 3 the FT curves of the Fe and V K-edge EXAFS k2χ(k) functions for Ni3Fe, Ni3V, and Ni3Fe0.5V0.5. As references, their Ni K-edge FT curves are too plotted (Fig. 3a). The FT curves of the Fe K-edge data of Ni3Fe and Ni3Fe0.5V0.5 exhibit two prominent coordination peaks at 1.5 and 2.7 Å that are identical to those of their Ni K-edge data (Fig. 3b), suggesting the substitutional doping of Fe in the Ni(OH)2 host. Similarly, the FT curves of Ni3V and Ni3Fe0.5V0.5 each pomp a prominent V–O peak at 1.4 Å and a V–M (M = Fe, Ni, or V) peak at about 2.8 Å (Fig. 3c), and the high-shell peak of Ni3Fe0.5V0.5 is weaker than that of Ni3V. The significant reduce in the intensity of the V–M coordination peak in the FT curve of Ni3Fe0.5V0.5 is most likely caused by the highly distorted local structure of V substituting for the site of Ni. To substantiate the substitution of V for Ni in Ni(OH)2 lattices, the WT analysis of the V K-edge data was performed. A maximum at the cross point of R = 2.8 Å and k = 7.8 Å−1 appears in the EXAFS WT map at the V K-edge for Ni3Fe0.5V0.5 (Supplementary Fig. 7), just fancy that for Ni3V. This implies the presence of V–Fe/Ni scatterings at a distance of around 2.8 Å surrounding V atoms and affords direct evidence for the substitution of V atoms for the Ni sites in Ni(OH)2 lattices. They too made the calculation of the EXAFS spectra by assuming V adsorption on the Ni–Fe LDH layer or occupying the interstitial position. It turns out that in both cases the calculated spectra are quite different from the experimental V K-edge EXAFS spectra of Ni3Fe0.5V0.5 (Supplementary Fig. 8). Furthermore, DFT calculations suggest that V atoms initially placed on the top site of surface Ni or O atoms are relaxed to the interstitial between two LDH layers after structure optimization. The LDH structure with interstitial doping is noticeably buckled, with formation energy of −3.73 eV per V atom, less stable with regard to LDH with substitutional doping (−5.07 eV per V atom) (Supplementary Figs. 9, 10), supporting that V atoms occupy Ni positions in Ni(OH)2 lattices rather than the interstitial or top positions of LDH layers. On the other side, from Supplementary Fig. 11, the nearest-neighbor FT peak position of V is shifted to the lower-R side and the second coordination peak to higher-R side with apparently reduced intensity as compared to that of Fe. This implies the remarkable different local environment of the substitutional V from that of Fe in Ni3Fe0.5V0.5. The quantitative parameters extracted from EXAFS curve-fitting (Supplementary Figs. 12‒14 and Supplementary Tables 2‒4) further testify that the bond length of V–O (1.72 Å) is significantly contracted with regard to those of Fe–O (2.00 Å) and Ni–O (2.03 Å).

Fig. 3

XAS spectra of the as-prepared Ni-based (oxy)hydroxide catalysts. FT curves of a Ni K-edge, b Fe K-edge, and c V K-edge EXAFS k2χ(k) functions

Understanding the electronic interaction in Ni3Fe1−xVx

The electronic states of Fe and V in catalysts were investigated by ex-situ difficult X-ray absorption near-edge spectroscopy (XANES). Generally, in XANES spectra the intensity of the pre-edge peak depends predominantly on central site symmetry, while the absorption edge position is correlated to the oxidation condition of central sites42. The absorption edges of Ni3Fe, Ni3V, and Ni3Fe0.5V0.5 in the XANES curves of Ni K-edge (Supplementary Fig. 15a) are everyone alike to that of the original Ni(OH)2, indicative of nearly identical average oxidation states of Ni in the catalysts. Similarly, the XANES curves of Fe K-edge in Supplementary Fig. 15b testify that the adsorption edges of Fe for Ni3Fe, Ni3Fe0.5V0.5, and Fe2O3 reference are almost overlapped, manifesting that the average valence states of Fe are nigh to +3 in the as-prepared catalysts. Importantly, the V K-edge XANES spectra of Ni3V and Ni3Fe0.5V0.5 exhibit intense pre-edge peaks (Supplementary Fig. 15c), indicating the distorted coordination environment around V atoms in these materials42. More interestingly, Ni3Fe0.5V0.5 shows a higher pre-edge peak than that of Ni3V in the V K-edge XANES, implying a higher degree of octahedral geometry distortion at the V sites in Ni3Fe0.5V0.5 compared to those in Ni3V. Additionally, the K-edge absorption positions of Ni3V and Ni3Fe0.5V0.5 are more nigh to those of VO2 and V2O5 than to that of V2O3 (inset of Supplementary Fig. 15c), suggesting that the majority of V ions are in the formal valences of +4 and +5 in both catalysts.

The as-prepared Ni3Fe1−xVx films were further studied by XPS and ex-situ soft XAS to gain an insight into the electronic interaction between Fe/V dopants and Ni atoms at the surface of catalysts. For Ni3Fe0.5V0.5 NSs, the Ni 2p spectrum (Fig. 4a) exhibits two fitting peaks at 872.3 and 854.4 eV along with two shakeup satellites at 878.4 and 860.1 eV, which are characteristic spin-orbit peaks of Ni2+ (refs. 13,28,43). In the Fe 2p region (Fig. 4b), Fe 2p1/2 and Fe 2p3/2 peaks arise at 724.8 and 711.5 eV, indicative of Fe in the +3 oxidation condition (refs. 16,29). The V 2p3/2 peak (Fig. 4c) can subsist deconvoluted into three peaks located at 516.2 eV (V5+), 515.1 eV (V4+), and 514.4 eV (V3+) (refs. 26,28,29), demonstrating that the V atoms are predominantly in high oxidation states (+4 and +5) in Ni3Fe0.5V0.5, together with a minority of V3+, which is consistent with the results obtained from V K-edge XANES spectra.

Fig. 4

High-resolution XPS and XANES spectra of the as-prepared Ni-based (oxy)hydroxide catalysts. XP spectra of a Ni 2p for Ni3Fe0.5V0.5, Ni3Fe, Ni3V, and unadulterated Ni (oxy)hydroxides, b Fe 2p for Ni3Fe and Ni3Fe0.5V0.5, and c V 2p for Ni3V and Ni3Fe0.5V0.5 (the dashed lines shown in a–c testify the shifts of BEs  of 3d metal ions caused by the hybridization of Fe or/and V dopants). d–f Ni, Fe, and V L-edge XANES spectra. g Schematic representations of the electronic coupling among Ni, Fe, and V in Ni3Fe, Ni3V, and Ni3Fe0.5V0.5

It is worthy of note that the Ni 2p BEs for the Fe or/and V doped binary and ternary materials are shifted apparently to higher BEs compared to those of unadulterated Ni (oxy)hydroxide, with the shift extent in an increasing order of Ni3Fe < Ni3V < Ni3Fe0.5V0.5 (Fig. 4a, Supplementary Fig. 16a, and Supplementary Table 5). In contrast, the V 2p peaks for Ni3V are shifted to lower BEs relative to the corresponding peaks for VO2 (ref. 44), and Ni3Fe0.5V0.5 displays V 2p3/2 peaks at BEs ~0.2 eV lower than those of Ni3V (Fig. 4c and Supplementary Fig. 16c). Of particular interest is that the BEs of Fe 2p1/2 and 2p3/2 for Ni3Fe are lower than those for Fe2O3 (ref. 45), but when half amount of Fe in Ni3Fe is replaced by V, Ni3Fe0.5V0.5 exhibits Fe 2p peaks at BEs not only considerably higher than those of Ni3Fe but too higher than Fe2O3 (Fig. 4b and Supplementary Fig. 16b), implying that the Fe dopant acts as an electron accepting site in Ni3Fe but an electron donating site in an integrated consequence when V is co-doped with Fe into Ni(OH)2 lattices. These observations suggest the partial electron transfer from Ni to Fe or V in the bimetal (oxy)hydroxides through oxygen bridges (O2−) between metal ions, and from Ni and Fe to V in Ni3Fe0.5V0.5, which is in profitable agreement with the calculated Mulliken charges for V, Fe, and Ni ions in Ni3Fe1−xVx (Supplementary Table 6).

These speculations are further supported by the Ni, Fe, and V L-edge XANES spectra shown in Fig. 4d‒f. Figure 4d illustrates that doping Fe or V could intensify the Ni L3-edge peak (852.5 eV), indicative of partial electron transfer from Ni to the substitutional Fe or V. The intensity of the Fe L3-edge peak at 709.8 eV for Ni3Fe is too enhanced when V is doped into Ni3Fe (Fig. 4e). On the contrary, the V L3-edge peak (518.3 eV) of Ni3Fe0.5V0.5 is considerably weakened and shows a red-shift, as compared with that of Ni3V (Fig. 4f). The comparative analyses of XPS and XANES spectra suggest that co-doping of Fe together with V into Ni(OH)2 lattices results in more electron transfer to the V in Ni3Fe0.5V0.5 compared to that in Ni3V (Fig. 4c, f and Supplementary Fig. 16c). The stalwart interaction among these 3d metal ions results in synergistic modulation of the electronic structure of the metal centers of Fe/V co-doped Ni(OH)2 (refs. 12,22,36,43), and the concerted consequence of Ni, Fe, and V metals with different energy levels of d-band centers could execute crucial contribution to the evident enhancement of OER activity of hybridized materials. Moreover, they calculated the branching ratio, L3/(L2 + L3), at the Fe L-edges of Ni3Fe and Ni3Fe0.5V0.5, which is approximately 0.74, implying the high-spin of Fe3+ (ref. 46). And they too calculated the Fe L2,3-edge XAS for the high-spin and low-spin models of Fe3+ (Supplementary Note 1 and Supplementary Methods). Obviously, the calculated high-spin L2,3-edge XAS could well bow the experimental data (Supplementary Fig. 17), affording more evidence for the high-spin configuration of Fe3+ substituting the Ni sites. Thus, the valence electronic configurations of Ni2+, Fe3+, V4+, and V5+ are 3d8 (t2g6eg2), 3d5 (t2g3eg2), 3d1 (t2g1eg0), and 3d0 (t2g0eg0), respectively, which are adopted in the following analysis of valence electron structures of metal ions in Ni3Fe, Ni3V, and Ni3Fe0.5V0.5.

The synergistically electronic interplay of Ni, Fe, and V cations in Ni3Fe0.5V0.5 is well explained in light of the analysis of valence electron structures of metal ions. In term of the result obtained from DFT calculations that the (Ni3Fe0.5V0.5)-OOH models with some aggregated Fe and V atoms subsist pleased lower formation energy and higher OER activity than the models with isolated Fe and V atoms (vide infra), a Ni–O–Fe–O–V–O–Ni unit (Fig. 4g) is used to analyze the electronic interaction of Ni, Fe, and V cations in Ni3Fe0.5V0.5. For Ni3Fe, the three unpaired electrons in the π-symmetry (t2g) d-orbitals of Fe3+ interplay with the bridging O2− via π-donation, while the predominant interaction between the fully occupied π-symmetry (t2g) d-orbitals of Ni2+ and the bridging O2− is electron–electron repulsion, leading to partial electron transfer from Ni2+ to Fe3+ (refs. 12,40). The partial electron transfer from π-symmetry lone pairs of the bridging O2− to V4+ and V5+ in Ni3V should subsist stronger than that from the bridging O2− to Fe3+ in Ni3Fe, as V4+ and V5+ subsist pleased rather low t2g occupancy while Fe3+ has a half t2g occupancy. As for the Fe/V co-doped Ni(OH)2 with some of the V and Fe atoms aggregated in the host lattices, when Fe3+ accepts partial electrons from Ni2+ through the bridging O2− via π-donation as exampled by the NiFe (oxy)hydroxide reference, the electron-riched t2gd-orbitals of Fe3+ could relay electrons to the strongly electron-deficient t2gd-orbitals of V4+ and V5+ through the bridging O2− ions between them, which leads to better delocalization of the π-symmetry electrons among Ni, Fe, and V in the host matrix. This argument is in profitable agreement with the XPS and soft XANES results. In Ni3Fe1−xVx, the Fe3+ and Ni2+ with half-full eg orbitals would subsist pleased very weak bonding with adsorbed oxygen species, whereas the V4+ and V5+ with eg0 orbitals would form too stalwart bonding with adsorbed oxygen species. To procure high OER activity, the bonding energy between transition metal and adsorbed oxygen species should subsist optimized to fulfill the Sabatier principle47. With expand of the electron density on V by partial electron transfer from Fe and Ni to V through the bridging O2− ions, the high valence states of V could subsist stabilized under OER conditions, and more importantly, the stalwart bond energy between V and adsorbed oxygen species could subsist tuned to a qualify bond strength, which would profit for releasing O2 from the V site in OER.

Evaluating the electrochemical OER performance of Ni3Fe1−xVx

The electrocatalytic OER performance of Ni3Fe1−xVx/CFP were studied in O2-saturated 1 M KOH. The linear sweep voltammograms (LSVs, Fig. 5a) of everyone as-prepared Ni-based (oxy)hydroxide catalysts testify the Ni2+/Ni3+ oxidation in the potential purview of 1.33–1.42 V (all potentials are versus reversible hydrogen electrode (RHE))5,7,43.

Fig. 5

Electrochemical tests for OER and Nyquist plots of the Ni-based (oxy)hydroxide catalysts. a LSV curves of Ni3Fe1−xVx and unadulterated Ni (oxy)hydroxide catalysts on CFP, as well as bare CFP in O2-saturated 1 M KOH at a scan rate of 5 mV s−1. b Tafel plots derived from the polarization curves in a. c Chronopotentiometric curves obtained with Ni3Fe0.5V0.5 at constant current densities of 10 and 100 mA cm−2. d Nyquist plots of Ni3Fe0.5V0.5, Ni3Fe, Ni3V, and Ni (oxy)hydroxides and the bare CFP at 300 mV overpotential in 1 M KOH

Figure 5a illustrates that the electrocatalytic activity of Ni3Fe1−xVx depends largely on the co-doping flush of Fe and V atoms. Among the as-prepared Fe- or/and V-doped Ni-based binary and ternary catalysts, Ni3Fe0.5V0.5 exhibits the best OER performance, with low overpotentials of 264 and 291 mV to achieve 100 and 500 mA cm−2 current density, respectively (Supplementary Fig. 18). The LSV of Ni3Fe0.5V0.5, scanning from positive to negative direction to exclude the influence of the Ni2+/Ni3+ oxidation event on the catalytic current, shows that only 200 mV overpotential is required to attain 10 mA cm−2 current density. The OER performance of Ni3Fe0.5V0.5 is on a par with or even surpasses that of the first-class earth-abundant catalysts reported to date (Supplementary Table 7).

Moreover, the turnover frequency (TOF, based on total amount of metals) of Ni3Fe0.5V0.5 (0.574 s−1) at η = 300 mV in 1 M KOH is significantly larger than those of Ni3Fe (0.018 s−1), Ni3V (0.097 s−1), Ni3Fe0.67V0.33 (0.116 s−1), and Ni3Fe0.33V0.67 (0.195 s−1). Figure 5b manifests that the Tafel slope of Ni3Fe0.5V0.5 (39 mV dec−1) is considerably smaller than those of Ni3Fe0.67V0.33 (59 mV dec−1), Ni3Fe0.33V0.67 (54 mV dec−1), Ni3Fe (67 mV dec−1), and Ni3V (67 mV dec−1). The apparently larger TOF value and smaller Tafel slope of Ni3Fe0.5V0.5 as compared to those of Ni3Fe and Ni3V testify that the synergetic consequence of co-doped Fe and V plays an necessary role in facilitating the kinetics of OER and enhancing the intrinsic activity.

The stability of Ni3Fe0.5V0.5 was assessed by repeated cyclic voltammetry scanning, multi-current step test, and long-term chronopotentiometric experiments. After being subjected to 4000 CV cycles, the OER polarization curve of Ni3Fe0.5V0.5 almost overlaps with the initial one (Supplementary Fig. 20a), indicating no noticeable loss in catalytic current, and thus, the profitable accelerated stability of the electrode. Supplementary Fig. 20b shows the E–t plot of two cycles of multi-current step curves for Ni3Fe0.5V0.5 with current density being enhanced from 50 to 500 mA cm−2 by five steps. In each step, once a inevitable current density is set, the potential promptly levels off and maintains constant for 500 s; the multi-current step curve is well repeated in the subsequent cycle. This observation signifies quickly mass transportation and profitable electronic conductivity of the 3D Ni3Fe0.5V0.5/CFP matrix13. Additionally, the Ni3Fe0.5V0.5/CFP electrode displays profitable stability at fixed current densities of 10 and 100 mA cm−2, respectively, over 60 h of electrolysis (Fig. 5c), indicating excellent stability of the electrode under testing conditions. The Faradaic efficiency of Ni3Fe0.5V0.5 evaluated from a chronopotentiometric experiment at a constant current density of 10 mA cm−2 for 2 h is nigh to 100% (Supplementary Fig. 21).

To subsist pleased a common understanding on the superior activity of Ni3Fe0.5V0.5, they estimated the roughness factors (RF) and measured the electrochemical impedance spectroscopy (EIS) of everyone as-prepared Ni-based electrodes. Based on the estimated RF values (Supplementary Fig. 22 and Supplementary Note 2), the OER polarization curves of Ni3Fe1−xVx were ploted with J normalized by RF values (Supplementary Fig. 23) to estimate the improvement of intrinsic OER activity for the Ni-based (oxy)hydroxides with different Fe and V doping levels3. The specific current density (Js = 61.6 mA cm−2) of Ni3Fe0.5V0.5 at 300 mV overpotential is about 3, 16, and 71 times higher than those of Ni3V, Ni3Fe, and unadulterated Ni (oxy)hydroxides, respectively, which reveals that the co-doping of Fe and V into Ni(OH)2 lattices is much more effective than separately doping Fe or V for improving the specific activity of Ni-based catalysts, and the improved specific activity contributed largely to the high OER activity of Ni3Fe0.5V0.5. The Nyquist plots (Fig. 5d) are fitted to a simplified Randles equivalent circuit model (Supplementary Note 3). The very miniature semicircles in the high frequency zone are attributed to the internal charge-transfer resistances (Rct(int)) of electrodes, and the second semicircles depict the charge-transfer resistances (Rct(s–l)) at the electrode/electrolyte interface. Both Rct(int) and Rct(s–l) values apparently decreased as Fe and V were co-doped into Ni(OH)2 lattices. The total charge-transfer resistances (Rct) measured at 300 mV overpotential are 4.2, 7.2, 10.0, and 17.2 Ω for the CFP-supported Ni3Fe0.5V0.5, Ni3V, Ni3Fe, and unadulterated Ni (oxy)hydroxides, respectively (Supplementary Table 9). The excellent charge-transfer capability of Ni3Fe0.5V0.5 makes a crucial contribution to the superior intrinsic OER activity of the electrode48.

In-situ EC-Raman/XAS studies and hypothetical calculations

To subsist pleased an in-depth insight into the origin of high activity of the Fe/V co-doped Ni(OH)2, the changes in electronic structures and local atomic environments of Ni3Fe0.5V0.5 under OER conditions were studied by in-situ electrochemical Raman (EC-Raman) spectroscopy and in-situ XAS. The measurements of in-situ EC-Raman spectra were carried out at the potential purview of 1.0–1.8 V in a spectroelectrochemical (PEC) cell filled with 1 M KOH electrolyte (Fig. 6a). When the applied potential was higher than 1.4 V, a pair of well-defined Raman peaks at around 470 and 550 cm−1 appeared, which were correlated respectively with the eg bending and the A1g stretching vibration of Ni–O in the NiOOH-type phase49,50. On the basis of EC-Raman spectra, the host phase of NiIII–OOH, formed during the OER process, could provide an electrically conductive, chemically stable, and electrolyte-permeable framework for the Fe and V dopants48,51, which would profit the electrochemical OER.

Fig. 6

In-situ EC-Raman and difficult XAS spectra. a In-situ EC-Raman spectra of Ni3Fe0.5V0.5 at the potentials of 1.0–1.8 V in 1 M KOH. b, d, f In-situ Ni, Fe, and V K-edge XANES spectra at the potentials of 1.15–1.75 V. c, e, g FT curves of Ni, Fe, and V K-edge EXAFS k2χ(k) functions obtained from the XANES spectra in b, d, f, respectively. The orange and pink circles depict the fitting values

Furthermore, the alteration in the local coordination environment of Ni–O/Fe–O/V–O units and the average oxidation states of Ni, Fe, and V centers in Ni3Fe0.5V0.5 were investigated by in-situ difficult XAS (Supplementary Fig. 24). The in-situ Ni K-edge XANES spectra (Fig. 6b) testify that the Ni absorption-edge and the white-line are gradually shifted to the higher-energy side as the applied potential is increased from 1.15 to 1.75 V. Accordingly, the Ni–O distance is shortened from 2.04 Å at 1.15 V to 1.90 Å at 1.75 V (Fig. 6c and Supplementary Table 8). The former is nigh to the Ni–O bond length (2.05 Å) in Ni(OH)2, and the latter is almost identical with the Ni–O bond length (1.88 Å) in NiOOH, which contains a admixture of Ni3+ and Ni4+ sites10. This is in line with the results of in-situ EC-Raman spectroscopy. A similar shift of the Fe white-line peak toward the higher-energy side is too observed with increasing applied potential (Fig. 6d), and the Fe–O distance is shortened slightly from 2.00 Å at 1.15 V to 1.97 Å at 1.75 V (Fig. 6e and Supplementary Table 8), signifying that the oxidation condition of Fe is increased from +3 to nearly +4 during the OER electrolysis process of Ni3Fe0.5V0.5. These FT-EXAFS suitable results of Ni and Fe K-edges of Ni3Fe0.5V0.5 in both repose and activated states are consistent with the previous reports10,14. More interestingly, with increasing the applied potential from 1.15 to 1.75 V, the pre-edge peak is slightly decreased in intensity in the in-situ V K-edge XANES spectrum (inset of Fig. 6f), however, it shows identical spectral features to those measured before OER. Similarly, except for the reduce in the intensity of the characteristic peaks, no other obvious change is visible at the ex-situ V L-edge spectra (Supplementary Fig. 25) after OER measurement at 1.75 V. This evidence suggests partial electron transfer to the V 3d orbitals, as their peak intensity is proportional to the unoccupied density of 3d states. Meanwhile, the V–O1 distance is too shrunk from 1.70 Å at 1.15 V to 1.65 Å at 1.75 V (Fig. 6g and Supplementary Table 8), which is nigh to that of the shortest V–O bond length reported for V5+ oxides (1.59 Å) while much shorter than that reported for V4+ oxides (1.76 Å)42. The V atoms with such a short V–O bond may subsist pleased optimal binding capability with oxygen intermediates relative to Ni and Fe atoms, and exhibit enhanced OER activity, as will subsist illustrated by following hypothetical calculations. These in-situ XAS analyses manifest for the first time the contraction of M–M′ and M(M′)–O bond lengths and the short V–O bond distance in the activated V-containing (oxy)hydroxide OER catalysts.

DFT plus Hubbard U (DFT + U) calculations were conducted to subsist pleased a hypothetical understanding on the evident enhancement of OER activity of the Fe/V co-doped Ni(OH)2 from atomic level. It is known that Ni(OH)2 experiences phase transformations during charging and discharging, and its oxyhydroxides are proposed to subsist the dynamic phase for OER14,52,53. Thus, they regard β-NiOOH co-doped by V and Fe atoms with the experimentally optimized doping concentration of Ni:Fe:V = 6:1:1, as well as the systems doped by only V or Fe atom with Ni:V (Fe) = 3:1 (Fig. 7a and Supplementary Fig. 26). The model surfaces are covered by either water molecules or oxygen species that are possibly present in the reaction media. These models with different covered species give very similar results on the catalytic properties (Fig. 7c and Supplementary Table 6).

Fig. 7

DFT hypothetical models. a Side views of the Fe/V co-doped Ni (oxy)hydroxide model for DFT calculations, whose (101) surface is exposed for OER catalysis. b Structures and BEs of an OH*, O*, and OOH* intermediates adsorbed on the V site of the model in a with the lowest OER overpotential of 0.25 V. The surface metal atoms are covered by O species. c Volcano plot of OER overpotential versus BE contrast between OH* and O* species for various sites of Ni3Fe1−xVx (oxy)hydroxide models. For each kind of reaction site, various structural models are considered, whose detailed information is given in Supplementary Fig. 28 and Supplementary Table 6. The dashed line is a usher for eyes. d Left panel: DOS of the model in a and the projected DOS on s, p, and d orbitals. prerogative panel: projected DOS on the 3d orbitals of Ni, Fe, and V atoms in the model. The dashed lines depict the d-band heart for each element. The Fermi flush is shifted to zero. e Calculated free-energy diagram of OER on the most dynamic site of Ni3Fe0.5V0.5 (oxy)hydroxide in pH 14 solutions at different potentials (T = 298 K). The two-way arrow indicates the overpotential of the rate-limiting step

In the optimized models, the bond lengths between metals and oxygen intermediates are 1.60–1.84, 1.63–1.95, and 1.77–2.05 Å for V, Fe, and Ni, respectively, which are in profitable agreement with the trend of experimental XAS results. The discrete bond length between O atom and V, Fe, or Ni element is a reflection of their different bond order and bond strength, which is fundamentally governed by the electronic troupe structure of the material. As revealed by the density of states (DOS) in Fig. 7d, the V, Fe, and Ni atoms in the co-doped Ni(OH)2 subsist pleased the d-band heart of 0.09, −2.55, and −2.78 eV, respectively. On the basis of the d-band theory54, the V atoms with higher d-band heart possess less occupancy of the antibonding states with adsorbed oxygen intermediates, and thus exhibit optimal binding with regard to Ni and Fe atoms (Fig. 7c).

Mulliken permeate analysis55 shows partial charges of ~1.6, 1.0, and 0.8e on the V, Fe, and Ni sites, respectively, signifying the stronger metallicity of V atoms and higher chemical activity. Although DFT calculations cannot identify the exact valence for each metal in multi-metal materials, the trend of the partial charges on the V, Fe, and Ni sites obtained from Mulliken permeate analysis is consistent with that of the valences of V4+/5+, Fe3+, and Ni2+ estimated on the basis of XANES and XPS. Moreover, the Ni (oxy)hydroxide systems without V doping are half-metal (Supplementary Fig. 27), while the V doping induces finite DOS for the spin-down states near the Fermi flush (Fig. 7d), which may attend better the electrical conductivity of the material.

In the previously reported mechanism for 3d metal-based (oxy)hydroxide catalysts in alkaline media, the OER undergoes through following four elementary steps56,57:

$$^\ast + {\mathrm{OH}}^ - \to {\mathrm{OH}} ^\ast {\mathrm{ + }}e^ -$$

(1)

$${\mathrm{OH}} ^\ast {\mathrm{ + OH}}^ - \to {\mathrm{O}} ^\ast + {\mathrm{H}}_2{\mathrm{O}}\left({\mathrm{l}} \right) + e^ -$$

(2)

$${\mathrm{O}} ^\ast + {\mathrm{OH}}^ - \to {\mathrm{OOH}} ^\ast + e^ -$$

(3)

$${\mathrm{OOH}} ^\ast + {\mathrm{OH}}^ - \to ^\ast + {\mathrm{O}}_2\left( {\mathrm{g}} \right) + {\mathrm{H}}_2{\mathrm{O}}\left({\mathrm{l}} \right) + e^ -$$

(4)

where * represents an dynamic site on the catalyst surface; OH*, O*, and OOH* are the oxygen intermediates. To evaluate the OER activity of the Fe and/or V doped or unadulterated Ni (oxy)hydroxide systems, they computed the BEs of oxygen intermediates on various metal sites. The Gibbs free energy for each reaction step and hypothetical OER overpotentials were calculated with the benchmark hydrogen electrode (SHE) method58.

As displayed by Fig. 7c, the OER overpotentials of doped Ni (oxy)hydroxides result a volcano-shape relation with the subsist contrast between OH* and O* (or OOH*) species59. In particular, oxygen binding on the Fe and Ni sites is relatively weak, i.e. EOH* > 1.15 eV and EO*–EOH* > 2.24 eV. As a consequence, formation of OH* and O* species encounters big potential barriers (Supplementary Fig. 29a, b) and will restrict the reaction rate of OER process. big overpotentials of 0.72–0.79 and 0.84–1.08 V are obtained for the Fe and Ni sites, respectively, indicating their low activity for OER. By contrast, the V sites provide much stronger but qualify oxygen binding energy (EOH* = 0.47–0.79 eV and EO*–EOH* = 1.61–2.23 eV) and give near-optimal BEs of OER intermediates. Reactions to the formation of OH* and O* species are readily accessible, while formation of OOH* experiences the largest potential barrier and limits the OER rate, giving overpotentials of 0.25–0.63 V, which are much lower than those for Ni and Fe sites. Therefore, the highest activity is predicted on the V site of the co-doped Ni (oxy)hydroxide with some of the V and Fe atoms aggregated (Fig. 7b). Such V sites provide stalwart OOH* binding relative to O* species, and the overpotential is even lower than that of the benchmark catalyst RuO2, i.e., 0.40 V for the (110) surface according to their calculations. The origin of overpotentials is clearly revealed by the free-energy diagrams as shown in Fig. 7e and Supplementary Fig. 29. The largest potential step at the equilibrium potential (U = 0.402 V) indicates the rate-limiting step (RLS) and corresponding overpotential, by overcoming which everyone the OER steps become downhill and thus can occur spontaneously from the thermodynamic point of view (Supplementary Note 4). In general, the hypothetical OER overpotentials result the identical trend as the experimental values: Fe/V co-doped < V-doped < Fe-doped < undoped Ni (oxy)hydroxide (Supplementary Fig. 28 and Supplementary Table 6). DFT calculations testify that the OER activity of V sites doped in Ni3Fe0.5V0.5 was greatly enhanced by the surrounding Ni/Fe next-nearest neighbors, and more importantly, the (Ni3Fe0.5V0.5)-OOH models with some of Fe and V atoms aggregated in NiOOH lattices subsist pleased lower formation energy and higher OER activity than the models with isolated Fe and V atoms. This inference is harmonize with the statement made by Bell and Calle-Vallejo et al. that for Fe-doped Ni (oxy)hydroxides the surrounding Ni neighbors expand the activity of Fe sites10,60,61.

### Latest Nortel Software Release Offers SMBs unusual Levels of Simplicity and Unified Communications | killexams.com actual questions and Pass4sure dumps

TORONTO, ONTARIO -- (Marketwire) -- 11/03/09 -- miniature and medium-sized businesses (SMBs) can obtain productivity, cost-savings and the investment protection critical to success in today's commerce environment with unusual unified communications-based (UC) software from Nortel(1) (OTCBB: NRTLQ). The latest software release 5.0 for Nortel's award-winning commerce Communications Manager (BCM) adds unusual UC capabilities, including unified presence, and greater simplicity with the introduction of a common software stream for BCM50 and BCM450.

The Nortel BCM450 and BCM50 are Linux-based IP/TDM PBXs delivering application-rich, all-in-one solutions for converged voice and data communications. The BCM50 serves businesses with up to 50 users while the larger capacity BCM450 is suitable for growing medium to big businesses and offshoot offices with up to 300 users. Each supports a blend of IP and digital clients and can enable firms to reclaim up to 70 percent of their original investment by reusing existing equipment.

As section of the unusual BCM Rls 5.0 software, BCM450 and BCM50 provide SMBs with dynamic UC features fancy InTouch, which delivers prerogative federated presence, and accepted integrated communications applications and capabilities. InTouch lets users communicate easily with anyone in their personal directory - across Microsoft Outlook, Nortel BCM, MSN, and Skype for click-to-call, click-to-IM, and click-to-email. By connecting people faster, improving collaboration and speeding up the time to decision, Nortel estimates that unified communications can attend businesses realize cost-savings and an expand in productivity of up to 18 percent.

Last year, the Nashville Convention and Visitors Bureau(2) (NCVB) leveraged its BCM450 solution to book more than 650,000 hotel rooms while marketing tourism on behalf of various partners. NCVB is now trialing BCM Rls 5.0 and plans to roll out the InTouch application in the coming weeks. Kay Hopwood, NCVB's director of Information Technology, is looking forward to seeing real-time presence for everyone on the network and having a view into missed calls even when a caller does not leave a voicemail. For now, NCVB is enjoying the first BCM Rls 5.0 feature it deployed, FindMe/FollowMe (FMFM), which enables simultaneous ringing of up to five additional external devices. "Every summon is potential business," said Hopwood. "With BCM's FindMe/FollowMe capability, their sales team never has to miss another revenue-generating summon again."

Minitel(2), a premier Nortel confederate providing service across Canada, too chose to crucible BCM Rls 5.0 in its own office production system. Its Toronto vice president of Operations, Dan Silverman, was so pleased with the progress of the in-house crucible he convinced a big accounting solid client to deploy it as well. "The installation was as smooth as could subsist and the client is now rolling out both InTouch and FindMe/FollowMe to multiple users in their organization with ease. They were able to procure their client up to hurry on the interface and rolling the application out by themselves in less than an hour," said Silverman.

Mexico's Universidad Latinoamericana(2) (ULA) similarly tested the latest BCM software with positive results. "We are in the commerce of educating today's youth and preparing them for the future and the challenges ahead," said Mario Ahumada Sandoval, subdirector of Systems, ULA. "To consequence so, they count on having the latest in communications technology that helps us offer a wealthy UC experience for staff and students. Trialling BCM Rls 5.0, they institute that the product's unusual feature set enhances their UC experience, while maximizing materiel already in place."

BCM50 customer, Philkeram-Johnson(2), the oldest ceramic tile producer in Greece, too welcomed the unusual software release. "Our Nortel BCM50 gives us room to grow, in terms of capacity and functionality, and it delivers the features they necessity to evolve to a unified communications environment," said Christos Syropoulos, commercial manager, Philkeram-Johnson. "We are constantly seeking ways to enhance their products and their productivity so they can respond more quickly to customers. I'm enthusiastic to find out more about the unusual features available in BCM Rls 5.0 and how they can employ them to enhance their communications."

In addition to the InTouch and FMFM capabilities, BCM Rls 5.0 lets a user forward a voice message using a file so that it can subsist played or read by any mobile device in the world. Meet-Me Conferencing for BCM now provides up to 125 ports with back for as many as 300 users. Professional summon Recording, a capability typically supplied by a third party is too available as section of the latest BCM release.

As a further means of streamlining costs and operations making it even more simple for SMBs and Nortel channel partners to install, provision, and migrate pre-existing data, the unusual BCM50 and BCM450 portfolio includes common software and applications, O/S, training, accreditation, user interfaces, and documentation.

Dell'Oro ranks Nortel's SMB portfolio #1 in the world in number of hybrid-IP lines shipped and #2 in SMB market revenue for the second quarter 2009. Nortel's BCM solutions are localized and sold in over 120 countries through more than 1000 channels.

Hear from more BCM users and partners:

- "FindMe/FollowMe and Message Forwarding allow Charter Telecom's(2) sales and technical staff to subsist more accessible to their customers, whether in the office or on the road. With the talent for individual users to customize these features to their liking through a Web-based GUI utensil Mailbox Manager. Their system administrator no longer has to execute daily changes. FMFM and the talent to seamlessly transfer calls between their desk phones and cellular phones has too allowed us to lower their costs, provide their staff with more flexibility, and expand their availability to customers." - David Harper, voice systems engineer, Charter Telecom - Canada

- "Our office communications subsist pleased been based exclusively on Nortel's BCM systems for years. They recently upgraded to the latest BCM technology, retaining most of their initial investment in hardware and everyone of the investment in software licenses. The unusual UC functionality increases their productivity and saves time. It too allows us to connect to other systems fancy Communications Server 1000 and Microsoft OCS. With InTouch they are able to manage their online contacts at MSN and Skype from a single application interface in MS Outlook, along with their office colleagues, customers, and partners." - Nikos Koulioumbis, SMB solutions director, UniNortel SA(2) - Greece

- "Innovative unusual features such as InTouch with federated presence, FindMe/FollowMe, Professional summon Recording and enhanced CTI applications are everyone powerful productivity enhancers that will reclaim businesses time and money and this really resonated with the customers they talked to at a recent seminar held in Nortel's Maidenhead office. They had enthusiastic feedback from attendees including a London-based voice and data solutions provider who said he most enjoyed the portion of the seminar that focused on BCM Rls 5.0." - Thomas Jacques, managing director, 1st Communications(2) - UK

- "The BCM product has always been one that we've been haughty to offer to their customers due to its converged voice and data solution for miniature and medium businesses. As a longtime channel confederate of Nortel's in Mexico, they notice forward to being able to offer those identical features, in addition to newly enhanced ones with the unusual software release of BCM Rls 5.0 with unusual features such as FindMeFollowMe, Professional summon Recording, and enhanced CTI applications which will expand their customer's productivity." - Jorge Alberto Jimenez Hernandez, director of engineering, Innovaciones Telematicas, S.A. de C.V.(2) (INTELEMATICA) - Mexico

Nortel delivers communications capabilities that execute the pledge of commerce Made Simple a reality for their customers. Their next-generation technologies, for both service provider and enterprise networks, back multimedia and business-critical applications. Nortel's technologies are designed to attend eliminate today's barriers to efficiency, hurry and performance by simplifying networks and connecting people to the information they need, when they necessity it. For more information, visit Nortel on the Web at www.nortel.com. For the latest Nortel news, visit www.nortel.com/news.

Certain statements in this press release may contain words such as "could", "expects", "may", "anticipates", "believes", "intends", "estimates", "targets", "envisions", "seeks" and other similar language and are considered forward-looking statements or information under applicable securities legislation. These statements are based on Nortel's current expectations, estimates, forecasts and projections about the operating environment, economies and markets in which Nortel operates. These statements are matter to necessary assumptions, risks and uncertainties, which are difficult to predict and the actual outcome may subsist materially different from those contemplated in forward-looking statements. For additional information with respect to inevitable of these and other factors, espy Nortel's Annual Report on Form10-K, Quarterly Reports on form 10-Q and other securities filings with the SEC. Unless otherwise required by applicable securities laws, Nortel disclaims any aim or obligation to update or revise any forward-looking statements, whether as a result of unusual information, future events or otherwise.

(1)Nortel, the Nortel logo and the Globemark are trademarks of Nortel Networks.

(2)This is a 3rd party link as described in their Web linking practices.

Use of the terms "partner" and "partnership" does not imply a legal partnership between Nortel and any other party.

### About using Nix in my progress workflow | killexams.com actual questions and Pass4sure dumps

Two years ago, whenever I needed to employ some language or utensil which wasn’t available on my machine, I would subsist pleased used the system’s package manager to install it. It worked on my computer, but when I needed to reproduce the setup elsewhere it was another story. I was still a student then.

I recall a group project in which they were using Node.js. I had a recent version installed on my Mac via Homebrew, while at the university and on other student’s computer based on Ubuntu Linux, it was installed from the default repos. Then, my code using default parameters in functions would rush on my machine but not on other’s, since their Node.js version was greatly outdated.

Using this approach can quickly become a nightmare, especially when you try to write a documentation on how to set up the progress environment. You cessation up writing things like: “If you are on macOS tickle consequence this, on Debian consequence that, and Fedora rush this other command.” You can verify it works now, but there is no guarantee it will still labor in a few months.

asdf

At the cessation of my studies, while starting my internship, I started to consequence a lot more software progress at home. Mainly because I didn’t subsist pleased to worry anymore about not doing my homework. This is back then I discovered Elixir and started to build up my workflow, seeking for quality, reproducibility and joy of use. With my Node.js tale in mind, I discovered language version managers. I went for asdf as it would handle for me quite a bunch of languages, including Erlang, Elixir, Node.js and Ruby.

If you are not familiar with it, asdf can install exactly the version you want for each language it handles through a plugin system. You can even subsist pleased multiple versions installed on the identical machine and set the wanted one for every project using a .tool-versions file which looks fancy this:

erlang 21.0elixir 1.7.3-otp-21

It is simple to use, and you can set up easily your build environment on different machines, running asdf install in a project directory.

Yet, if the setup process is simplified, there are still issues:

• after installing asdf, you necessity to install everyone the needed plugins. It is only a matter of asdf plugin-install <plugin-name> commands, but it is not automated;
• some languages require dependencies to build. Erlang, for instance, needs some packages to subsist installed before asdf install erlang <version> works. You necessity a compiler, ncurses, OpenSSL and quite a few more. Setup instructions depends on the system you use;
• If your project depends on other tools like, say, fwup for Nerves projects, you still subsist pleased to provide manual setup instructions.
• This is where Nix enters the game.

Nix

Nix defines itself as The Purely Functional Package Manager. Having scholarly the advantages of Functional Programming while using Elixir and looking at Haskell and other FP languages over the past year, its concept was very tempting to me.

Being purely functional means given an input, you always procure the identical output. That is, given a version of nixpkgs and a set of packages, you always procure the identical environment. In fact, packages are named derivations in the Nix jargon: they are functions that takes other derivations — their dependencies — as input and bow a derived result. They are built in isolation, so everyone dependencies must subsist explicitely stated. This ensures reproducibility.

Nix stores everyone the built derivations in the Nix store, usually located at /nix/store. A identical package can subsist present multiple times in the Nix store, at different versions or even at the identical version but using different versions of its dependencies. Remember: a built derivation is the product of everyone its dependencies; if you change something, it is a different product.

To achieve a unique naming for each derivation, a hash is computed from the set of its dependencies. You then procure a path like:

/nix/store/k13mm9jqxm2ndlwzsj7zicsq7lpmmjlg-elixir-1.7.3

Unlike other package managers, Nix does not employ the conventional /{,usr,usr/local}/{bin,sbin,lib,share,etc} directories. Instead, it uses a lot of symbolic links to create profiles. A profile is a kindly of derivation used to setup a user environment. In a profile, you procure a benchmark Unix tree with symbolic links to executables and configuration files stored in other derivation outputs. For instance,~/.nix-profile/bin/elixir is a symbolic link to:

/nix/store/k13mm9jqxm2ndlwzsj7zicsq7lpmmjlg-elixir-1.7.3/bin/elixir

Actually, ~/.nix-profile is itself a link:

~/.nix-profile -> /nix/var/nix/profiles/per-user/***/profile

Which itself points to profile-56-link wich finally points to somewhere in the Nix store:

That is, as I subsist pleased said above, a profile is a derivation. It derives from a set of packages, that themselves derive from other packages. Depends on becomes in Nix derives from. This is conceptual but you procure the idea.

Moreover, only what you asked for is made available in the environment. For instance, Elixir depends on Erlang. Erlang is then installed somewhere in the Nix store and the Elixir installation is watchful of it so it can labor correctly. But unless you explicitely asked to too install Erlang, only Elixir binaries will subsist linked in your user environment.

Nix as a declarative configuration manager

Package managers usually labor in an imperative way. That is, you interrogate them to install this, to perform an upgrade or to uninstall that. One really super feature of Nix is Nix, the language. It is a purely functional domain-specific language that comes with Nix.

The primary employ of Nix, the language, is to write derivations. Yet, different applications of Nix too leverage the language to manage packages and configuration declaratively. In NixOS — a special GNU/Linux distribution based on Nix — , everyone the system configuration and globally installed packages are declared in /etc/nixos/configuration.nix. It can notice like:

{ config, pkgs, ... }: {network.hostname = "nixos-test";time.timeZone = "Europe/Paris"; # Omitting a lot of options, this is just a sample. environment.systemPackages = with pkgs; [curlgitgnupghtop...];}

To change the condition of the system, you just subsist pleased to edit the file, then interrogate NixOS to switch to the unusual environment:

# nixos-rebuild switch

It derives a unusual system environment, switches to it and reloads services as needed. With this kindly of configuration, you can easily reproduce your system setup on different machines.

Another sample is home-manager. It aims to provide the identical kindly of declarative configuration as NixOS but at the user level. I personally employ it to manage my dotfiles and my set of user-wide-available utilities accross different machines.

Apart system and user environments, Nix can subsist used to setup a third kindly of environment. Let’s talk about it.

Nix as a reproducible environment builder

It is neither practical nor wantable to update your system or user environment each time you necessity a particular dependency for a given project. First, the given dependency can subsist required only by a specific project: you consequence not necessity to subsist pleased it available (system|user)-wide. Second, you want your environment to subsist shareable with other developers. Asking them to update their global environment with this or that requirement is not the best thing to do. This is where Nix shells enter.

A Nix shell is a temporary environment where build inputs of a derivation are made available to the user. Let’s thunder it more simply with an example: you can create a shell.nix file at the root of your project containing something like:

{ pkgs ? import <nixpkgs> {} }: with pkgs; mkShell {buildInputs = [ ocaml git ];}

Then, rush the nix-shell command. You are in a Nix shell, with OCaml and Git made available to you. The shell.nix can subsist committed, thus shared between developers.

Using Nix

To start working on a project using Nix, the first step is to install Nix itself. From the official documentation, everyone you subsist pleased to consequence is running:

$curl https://nixos.org/nix/install | sh There are in fact two kinds of installation for Nix: • the single-user installation, where /nix/store is owned by the user installing Nix. This is the simplest way to install Nix if you are the only user on your machine and don’t want to employ Nix extensively outside of setting your progress environment. It is too the easiest to uninstall as you just subsist pleased to delete the /nix directory; • the multi-user installation, where /nix/store is owned by root and a nixbld group has write access to it. everyone Nix operations are then performed by nix-daemon. Different users can employ Nix simultaneously and you gain a system environment fancy on NixOS. In the multi-user installation, builds are performed by special builder users in complete isolation. It is a exiguous bit more complex to manage, but this is the recommended way to install Nix if you diagram to employ it a lot, even if you are the only user on your machine. It is supported on macOS and everyone Linux running systemd with SELinux disabled. • As far as I know, the default installer currently choses automatically the kind of installation. It could change in the near future to prompting the user for a choice. In the meantime, you can constrain how to install Nix by doing, for a single-user installation:$ sh <(curl https://nixos.org/nix/install) --no-daemon

For a multi-user installation it is:

$sh <(curl https://nixos.org/nix/install) --daemon Nix being installed on you machine, you can create a shell.nix in your project: # This defines a office taking pkgs as parameter, and uses# nixpkgs by default if no argument is passed to it.{ pkgs ? import <nixpkgs> {} }: # This avoids typing pkgs. before each package name.with pkgs; # Defines a shell.mkShell {# Sets the build inputs, i.e. what will subsist available in our# local environment.buildInputs = [ elixir git ];} Then, everyone you subsist pleased to consequence is running:$ nix-shell

Nix will copy or build derivations, then rush a shell in which Elixir and Git are available. By default, the Nix shell is a bash. If you are fancy me and want to retain your profitable mature zsh for your day-to-day environment, there is an curious plugin for that.

In a benchmark Nix shell, your system-wide environment is still available. While it is quite useful for day-to-day work, you can easily miss a dependency when first structure your environment. If you want to subsist confident not to miss any dependency and ensure reproducibility, you should rush a unadulterated Nix shell, that is a Nix shell where only the inputs explicitely stated in the shell.nix are available:

\$ nix-shell --pure

You lax everyone your environment, everyone your aliases, everyone your usually available programs. You are in a standardised bash that will subsist the identical on every machine where you rush a unadulterated shell. It is not a snug Place to work, but it is really snug when your application builds in such a shell. It means any other developer or the future you will subsist able to setup the identical environment and build the application as expected. But for your comfort, you can employ a benchmark Nix shell most of the time.

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Wonderlic [2 Certification Exam(s) ]
Worldatwork [2 Certification Exam(s) ]
XML-Master [3 Certification Exam(s) ]
Zend [6 Certification Exam(s) ]

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