Electrochemical oscillations of a new type in an H2O2+H2SO4 | Pt-electrode system, appearing by addition of small amounts of halide ions

被引：28

作者：

Mukouyama, Y

Nakanishi, S

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：

JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 1999年 / 473卷 / 1-2期

关键词：

chemical oscillation; hydrogen peroxide; platinum; halides; adsorption; autocatalysis;

D O I：

10.1016/S0022-0728(99)00169-2

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Electrochemical oscillations of a new type, named oscillations C and D, appear, in addition to previously reported oscillations, named oscillations A and B, in the H2O2-reduction reaction on a PI electrode in acidic solutions when small amounts of halide ions such as Cl-, Br-,and I- are added to the solution. Oscillation A appears in a narrow potential region of - 0.25 to - 0.32 V Versus SCE where adsorbed hydrogen (upd-H) of a nearly full coverage is formed, and oscillation B appears in a region below ca. - 0.35 V where hydrogen evolution occurs, whereas oscillations C and D appear in potential regions more positive than - 0.30 V where halide ions are adsorbed on Pt. The detailed behavior of oscillations C and D is described and compared with that of oscillations A and B. Mathematical simulation has shown that the essential features of oscillations C (and D) can be understood by a reaction model which includes a kind of autocatalytic mechanism in which adsorbed halogen and OH promote dissociative adsorption of H2O2. (C) 1999 Elsevier Science S.A. All rights reserved.

引用

页码：156 / 165

页数：10

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