Influence of the NaOH Concentration on the Hydrogen Electrode Reaction Kinetics of Ni and NiCu Electrodes

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Influence of the NaOH Concentration on the Hydrogen Electrode Reaction Kinetics of Ni and NiCu Electrodes. / Kuznetsov, Aleksey N.; Oshchepkov, Alexandr G.; Cherstiouk, Olga V. et al.

In: ChemElectroChem, Vol. 7, No. 6, 16.03.2020, p. 1438-1447.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{39bdffc15ee049c4b49f1fce93dea10c,

title = "Influence of the NaOH Concentration on the Hydrogen Electrode Reaction Kinetics of Ni and NiCu Electrodes",

abstract = "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.",

keywords = "electron transfer theory, hydrogen electrocatalysis, Ni and NiCu catalysts, pH effect, sodium hydroxide",

author = "Kuznetsov, {Aleksey N.} and Oshchepkov, {Alexandr G.} and Cherstiouk, {Olga V.} and Simonov, {Pavel A.} and Nazmutdinov, {Renat R.} and Savinova, {Elena R.} and Antoine Bonnefont",

year = "2020",

month = mar,

day = "16",

doi = "10.1002/celc.202000319",

language = "English",

volume = "7",

pages = "1438--1447",

journal = "ChemElectroChem",

issn = "2196-0216",

publisher = "John Wiley and Sons Ltd",

number = "6",

}

RIS

TY - JOUR

T1 - Influence of the NaOH Concentration on the Hydrogen Electrode Reaction Kinetics of Ni and NiCu Electrodes

AU - Kuznetsov, Aleksey N.

AU - Oshchepkov, Alexandr G.

AU - Cherstiouk, Olga V.

AU - Simonov, Pavel A.

AU - Nazmutdinov, Renat R.

AU - Savinova, Elena R.

AU - Bonnefont, Antoine

PY - 2020/3/16

Y1 - 2020/3/16

N2 - 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.

AB - 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.

KW - electron transfer theory

KW - hydrogen electrocatalysis

KW - Ni and NiCu catalysts

KW - pH effect

KW - sodium hydroxide

UR - http://www.scopus.com/inward/record.url?scp=85082884937&partnerID=8YFLogxK

U2 - 10.1002/celc.202000319

DO - 10.1002/celc.202000319

M3 - Article

AN - SCOPUS:85082884937

VL - 7

SP - 1438

EP - 1447

JO - ChemElectroChem

JF - ChemElectroChem

SN - 2196-0216

IS - 6

ER -

ID: 23948496