Appearance of an oscillation through the autocatalytic mechanism by control of the atomic-level structure of electrode surfaces in electrochemical H2O2 reduction at Pt electrodes

被引：46

作者：

Nakanishi, S

Mukouyama, Y

Karasumi, K

Imanishi, A

Furuya, N

Nakato, Y ^{[1
]}

机构：

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

[2] Univ Yamanashi, Fac Engn, Dept Appl Chem, Yamanashi 4008510, Japan

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2000年 / 104卷 / 17期

关键词：

D O I：

10.1021/jp993961c

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The influence of the atomic-level structure of electrode surfaces on electrochemical oscillations has been studied in a system of H2O2 reduction on Pt electrodes in acidic solutions. A current oscillation of another type, named oscillation E, has been found to appear for an atomically flat single-crystal Pt(111) electrode, in addition to previously reported oscillations, named oscillations A and B. Oscillation E does not appear for atomically flat Pt(100), Pt(110), polycrystalline Pt, and Pt(111) with atomically nonflat surfaces. Mathematical simulation by use of a model including an autocatalytic effect of adsorbed OH for dissociative adsorption of H2O2, as a possible explanation, has reproduced the appearance of oscillation E, as well as observed correlations between the appearance of oscillation E and the magnitudes of H2O2-reduction current and "negative" resistance. It is discussed that an efficient autocatalytic mechanism works at the atomically flat Pt(111) surface, which is responsible for the appearance of oscillation E at this surface.

引用

页码：4181 / 4188

页数：8

共 27 条

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