Surface effects in the hydrogen evolution reaction on Ni-Zn alloy electrodes in alkaline solutions

Hydrogen evolution reaction was studied on Ni-Zn (25% of nickel before leaching) in 1M NaOH at 25 deg C. These electrodes were characterized by very low Tafel slopes of 67 mV dec exp -1 . Other techniques used included potential and current pulse, potential relaxation in an open circuit, and a.c. im...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 1995-10, Vol.142 (10), p.3313-3319
Main Authors: ANGELO, A. C. D, LASIA, A
Format: Article
Language:English
Subjects:
Applied sciences
Chemical and electrochemical properties
Exact sciences and technology
Metals. Metallurgy
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Summary:Hydrogen evolution reaction was studied on Ni-Zn (25% of nickel before leaching) in 1M NaOH at 25 deg C. These electrodes were characterized by very low Tafel slopes of 67 mV dec exp -1 . Other techniques used included potential and current pulse, potential relaxation in an open circuit, and a.c. impedance spectroscopy. Analysis of the experimental results led to the conclusion that H adsorption in the surface layers was responsible for the observed behavior. Influence of the oxidation of the electrode surface and the addition of poisons, thiourea and cyanides, were also studied. These processes inhibit the H absorption and restore normal Tafel slopes. Kinetic parameters of the H evolution reaction were determined.
ISSN:0013-4651
1945-7111
DOI:10.1149/1.2049980