Influence of the NaOH Concentration on the Hydrogen Electrode Reaction Kinetics of Ni and NiCu Electrodes
Full article
| Общее |
Language:
Английский,
Genre:
Full article,
Status:
Published,
Source type:
Original
|
| Journal |
ChemElectroChem
ISSN: 2196-0216
|
| Output data |
Year: 2020,
Volume: 7,
Number: 6,
Pages: 1438-1447
Pages count
: 10
DOI:
10.1002/celc.202000319
|
| Tags |
electron transfer theory; hydrogen electrocatalysis; Ni and NiCu catalysts; pH effect; sodium hydroxide |
| Authors |
Kuznetsov Aleksey N.
1,2
,
Oshchepkov Alexandr G.
1
,
Cherstiouk Olga V.
1,2
,
Simonov Pavel A.
1,2
,
Nazmutdinov Renat R.
3
,
Savinova Elena R.
4
,
Bonnefont Antoine
5
|
| Affiliations |
| 1 |
Boreskov Institute of Catalysis, Novosibirsk, 630090 Russia
|
| 2 |
Novosibirsk State University, Novosibirsk, 630090 Russia
|
| 3 |
Kazan National Research Technological University, 420015 Kazan, Russia
|
| 4 |
Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé, UMR 7515 CNRS-University of Strasbourg, 67087 Strasbourg Cedex, France
|
| 5 |
Institut de Chimie de Strasbourg, UMR 7177 CNRS-University of Strasbourg, 67070 Strasbourg, France
|
|
Funding (1)
|
1
|
Russian Foundation for Basic Research
|
17-53-150008
|
Nickel is a promising electrocatalyst for hydrogen electrode reactions in alkaline media. Its electrocatalytic activity for hydrogen oxidation and evolution reactions can be enhanced when its surface is partially covered by Ni (hydr)oxides or by associating it with Cu. In this work, the influence of the NaOH concentration on the hydrogen electrode kinetics on various Ni electrodes is investigated. On metallic Ni, the electrocatalytic activity (measured as an exchange current density normalized to the surface area of Ni) is almost constant between pH 12 and 14, whereas it decreases by a factor of two on partially oxidized Ni and on the NiCu/C electrode. Analyzing the current potential curves with the help of microkinetic modeling reveals that the Had and OHad binding energies on Ni do not depend on pH, whereas the rate constants of the Volmer and Heyrovsky reactions decrease with pH. The pH effect on the electron transfer elementary act is briefly discussed in the framework of a quantum mechanical theory.