Microstructure and catalytic activity towards the hydrogen evolution reaction of electrodeposited NiPx alloys

Burchardt, Trygve; Hansen, V.; Våland, T.

doi:10.1016/s0013-4686(01)00456-x

Cited by 72 publications

(56 citation statements)

References 11 publications

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“…As reported by Burchardt et al,20,21 for Ni-P alloys, the observed behaviour for Pd-P supports that the amorphous phase increase the amount and residence time of adsorbed hydrogen, and therefore Pd-P alloys appears as promising materials for the electrocatalytic hydrogenations. The obtained results also show the importance of the degree of amorphicity, (or in other words of the P content), pointing to Pd-P film with about 17 % at.…”

Section: Resultssupporting

confidence: 73%

“…This beneficial influence is more noticeable in the responses obtained in pure ethanol (Figure 4b). It is known that the HER rate is determined by the energy of adsorption and desorption of hydrogen; a low adsorption energy is associated to an incomplete surface coverage and thus to a low reaction rate, whereas when the adsorption energy is too high the overall reaction rate decreases due to the reduced ability of the species to desorption.As reported by Burchardt et al,20,21 for Ni-P alloys, the observed behaviour for Pd-P supports that the amorphous phase increase the amount and residence time of adsorbed hydrogen, and therefore Pd-P alloys appears as promising materials for the electrocatalytic hydrogenations. The obtained results also show the importance of the degree of amorphicity, (or in other words of the P content), pointing to Pd-P film with about 17 % at.…”

supporting

confidence: 73%

“…The use of amorphous materials in electrocatalysis has been subject of many reported studies; special attention has been paid to Ni-based alloys 20,21,24,25 being scarce the literature in what concerns Pd-electroless as electrode material for organic substrates hydrogenation.…”

Section: Resultsmentioning

confidence: 99%

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The influence of P content on the electrocatalytic properties of Pd-P electroless alloys for HER on aqueous/ethanolic media

Robertis

Fundo²,

Motheo

et al. 2005

J. Braz. Chem. Soc.

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Prepararam-se filmes de Pd-P sobre aço carbono, por deposição electroless, usando hipofosfito de sódio como agente redutor. As ligas foram caracterizadas (estrutura e morfologia) por Difração de Raios X (DRX) e Microscopia Eletrônica de Varredura (MEV) o que revelou que o grau de amorficidade aumenta com a quantidade de P co-depositado. A resposta de eletrodos de Pd-P, com diferentes composições, para a reação de evolução de hidrogênio (REH), analisada em soluções de água-etanol e de etanol puro, mostraram que o caráter amorfo das ligas aumenta a aptidão para adsorver hidrogênio. Os resultados sugerem que filmes de Pd-P com adequados teores em fósforo (17% at.) são superfícies de eletrodo apropriadas para a hidrogenação de substratos orgânicos.Pd-P modified carbon steel electrodes have been prepared by electroless deposition using sodium hypoposphite as reducing agent. The alloy characteristics (structure and morphology) were analysed by X-Ray Diffraction (XRD) and Scanning Electronic Microscopy (SEM) revealing that the degree of amorphicity increases with the amount of co-deposited P. The behaviour of Pd-P with different compositions towards the HER, analysed in water-ethanol and pure ethanol solutions, have shown that the alloy amorphous character enhances the hydrogen adsorption. The results suggest that Pd-P films with adequate phosphorous content (17% at.) are suitable electrode surfaces for organic substrates hydrogenation.Keywords: electroless deposition, Pd-P alloys, electrocatalytic activity IntroductionThe preparation of modified electrodes with catalytical properties for the hydrogen evolution reaction (HER) has been subject of intensive research, 1,2 due to its relevant use in industrial applications. The principal aim is to find a low cost and efficient cathodic material for the preparation of electrodes with high surface area. In this context, the metallic electroless deposition is considered an interesting alternative. 3,4 Besides the common utilisation of Ni and Pt for HER, Pd presents very good catalytic properties and it has also been used for hydrogenation reactions, 5,6 mainly as dispersed particles in low cost substrates. [7][8][9] For this purpose, Pd electroless baths have been improved and the respective deposits investigated; 10-13 reports on its use to prepare membranes 14,15 and in electronic components 16,17 reveal the increasing interest on electroless Pd.The behaviour towards HER of Ni based alloys, namely Ni-P is still a controversial since the alloy P content seems to be critical for the catalytic activity of the electrode. Paseka 18,19 endorses that some of these materials are electroactive for the hydrogen evolution reaction, while others, especially electrodes with high phosphorus content, (>12.5% at.) are inactive. Buchardt et al. 20,21 attribute the good performance of these electrodes to the amorphous structure. Other authors 22,23 support that films electrocatalytic activity does not depend solely on the phosphorus content, but would also be related to the preparation met...

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Section: Resultssupporting

confidence: 73%

supporting

confidence: 73%

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The influence of P content on the electrocatalytic properties of Pd-P electroless alloys for HER on aqueous/ethanolic media

Robertis

Fundo²,

Motheo

et al. 2005

J. Braz. Chem. Soc.

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“…In addition, we also notice that the intensity of the first shell peak decreases more acutely than that of the high coordination shell peaks in the RSFs with the P concentration increasing from 8 to 10 at.%. It indicates that the size of Ni-rich phase may be larger if P content is lower [17,18].…”

Section: Resultsmentioning

confidence: 99%

Effect of Phosphorus Content on Local Structures of NiP Amorphous Alloys

Song¹,

Zheng²,

Zhang³

et al. 2007

AIP Conference Proceedings

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Abstract. XAFS technique is used to determine the atomic and electronic structures of NiP amorphous alloys with different P concentrations prepared by chemical reduction method. From the radial structural function (RSF) obtained from EXAFS, it is found that the amorphous alloys with P content less than 10 at.% still present strong peaks corresponding to high coordination shells just like crystalline Ni. This indicates the prominent existence of Ni-rich phase with the fcc-structure, which is not remarkably modified by the P atoms. As the P content is as large as 14 at.%, only the first shell peak in the RSF can be observed and the higher shell peaks disappear. Therefore the sample is totally amorphous. The XANES results show that as the P concentration is above 26 at.%, charge transfers from Ni atoms to P atoms. For P concentration lower than 20at.%, on the contrary, charge transfers from P atoms to Ni atoms, and 3d electron density of Ni atoms reaches the maximum when P concentration is about 14~20 at.%.

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“…1 -3,5,6 Electron diffraction showed that the structure of the alloys was amorphous-nanocrystalline (see Refs 5,7). X-ray photoelectron spectroscopy (XPS) was performed using a VG Scientific MICROLAB Mk III, a VG Scientific ESCALAB MKII and a Thermo VG Scientific Sigma Probe spectrometers using the Al K˛radiation (h D 1486.6 eV).…”

Section: Methodsmentioning

confidence: 99%

Probing the electronic structure of NiX, (X = B, S, P) catalysts with XPS

Diplas

Jörgensen

Taftø

et al. 2006

Surface & Interface Analysis

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Amorphous films of Ni-B, Ni-P and Ni-S were produced by electrodeposition on pure polycrystalline Ni. The films were studied with X-ray photoelectron spectroscopy (XPS). Changes in the Auger parameter (AP), peak energy shifts and changes in the Ni 2p shake up satellite intensity and energy were used to probe the electronic changes occurring upon alloying Ni with P, S and B. It is suggested that the Ni sites experience a higher electron density in the alloys than in the pure element and this could be the reason for the increased catalytic activity.

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Microstructure and catalytic activity towards the hydrogen evolution reaction of electrodeposited NiPx alloys

Cited by 72 publications

References 11 publications

The influence of P content on the electrocatalytic properties of Pd-P electroless alloys for HER on aqueous/ethanolic media

The influence of P content on the electrocatalytic properties of Pd-P electroless alloys for HER on aqueous/ethanolic media

Effect of Phosphorus Content on Local Structures of NiP Amorphous Alloys

Probing the electronic structure of NiX, (X = B, S, P) catalysts with XPS

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