Mechanism and simulation of electrochemical current oscillations observed in the H2O2-reduction reaction on platinum electrodes in acidic solutions

被引：21

作者：

Mukouyama, Y

Hommura, H

Nakanishi, S

Nishimura, T

Konishi, H

Nakato, Y ^{[1
]}

机构：

[1] Osaka Univ, Grad Sch Engn Sci, Dept Chem, Toyonaka, Osaka 5608531, Japan

[2] Osaka Univ, Res Ctr Photoenerget Organ Mat, Toyonaka, Osaka 5608531, Japan

来源：

BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN | 1999年 / 72卷 / 06期

关键词：

D O I：

10.1246/bcsj.72.1247

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Mechanisms of electrochemical current oscillations of two types, named oscillation A and B, both observed for the H2O2-reduction reaction on Pt electrodes in acidic solutions, have been studied experimentally and by mathematical simulation. Oscillation A appears in a potential region just before hydrogen evolution, while oscillation B appears in a region of hydrogen evolution. A phase diagram we obtained has shown that oscillations A and B appear in limited ranges of the H+ and H2O2 concentrations and their ratio. The oscillation period for oscillation A increases with decreasing H2O2 concentration and negative shift of the electrode potential, mainly determined by the current density in the low-current state. Mathematical simulation by taking account of all plausible interfacial reactions (H2O2 reduction, hydrogen adsorption, and hydrogen evolution) reproduces the essential features of oscillation A, but does not reproduce oscillation B. It is shown that a positive feedback mechanism works in sudden transitions between the high- and low-current states for oscillation A.

引用

页码：1247 / 1254

页数：8

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