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Mechanistic study of the hydrogen evolution reaction on NiCoZn electrodes

✍ Scribed by M.J. de Giz; G. Tremiliosi-Filho; E.R. Gonzalez

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
447 KB
Volume
39
Category
Article
ISSN
0013-4686

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✦ Synopsis

Electrodeposited N&Co-Zn alloy on a mild steel substrate have shown high electrochemical activity for the hydrogen evolution reaction. Such materials were investigated previously by EDX surface analysis and evaluated as Hz-evolving cathodes in alkaline solution through steady-state techniques and under conditions of long-term operation. The material was found to have high surface area and its polarization behaviour to exhibit a low Tafel slope. This paper describes a detailed mechanistic study of the hydrogen evolution reaction on Ni-Co-Zn carried out mainly with impedance techniques. The values of the rate constants for the elementary steps were obtained. The analysis of the results suggests a mechanism involving an electron transfer followed by an electrochemical desorption step (Volmer-Heyrovsky mechanism). Through the study of the effect of temperature, it was possible to calculate the apparent activation energy of the rate determining step (25 kJmol_') which is the same value as that found for the overall reaction.

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