SURFACE EFFECTS IN THE HYDROGEN EVOLUTION REACTION ON NI-ZN ALLOY ELECTRODES IN ALKALINE-SOLUTIONS

被引：34

作者：

ANGELO, ACD ^{[1
]}

LASIA, A ^{[1
]}

机构：

[1] UNESP,DEPT QUIM,BAURU,SP,BRAZIL

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 1995年 / 142卷 / 10期

关键词：

D O I：

10.1149/1.2049980

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Hydrogen evolution reaction was studied on Ni-Zn (25% of Ni before leaching) in 1 M NaOH at 25 degrees C. These electrodes were characterized by very low Tafel slopes of 67 mV dec(-1). Other techniques used included potential and current pulse, potential relaxation in an open circuit, and ac impedance spectroscopy. Analysis of the experimental results led to the conclusion that hydrogen 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 hydrogen absorption and restore ''normal'' Tafel slopes. Kinetic parameters of the hydrogen evolution reaction were determined.

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页码：3313 / 3319

页数：7

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