HYDROGEN EVOLUTION REACTION ON GOLD ELECTRODE IN ALKALINE-SOLUTIONS

被引:33
作者
OHMORI, T
ENYO, M
机构
[1] Catalysis Research Center, Hokkaido University, Kita-ku, Sapporo
关键词
HYDROGEN EVOLUTION REACTION; ELEMENTARY REACTION; UNDERPOTENTIAL DEPOSITION OF ALKALI METAL ATOMS; ACTIVE SITES; GOLD ELECTRODE;
D O I
10.1016/0013-4686(92)87118-J
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
The mechanism of the hydrogen evolution reaction (HER) on an Au electrode in 0.5-2 x 10(-5)M NaOH and KOH solutions was investigated by observing the Tafel relationship, differential pseudo-capacitance and time constant of the electron transfer reaction. The HER kinetics follows the slow discharge mechanism over the whole range of solution concentration. It is demonstrated that at high concentrations, 0.5-0.01 M, the underpotential deposition (upd) of alkali metal takes place concomitantly, and it leads to poisoning of active sites of gold and thus strongly depresses the electrocatalytic activity. Anomalous concentration dependence of overpotential was observed at lower concentrations and its possible cause is discussed in relation to the upd of alkali metals.
引用
收藏
页码:2021 / 2028
页数:8
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