Bifurcation Behavior in Oscillations during H2O2 Reduction at Pt Electrodes

被引：2

作者：

Mukouyama, Y. ^{[1
]}

Hara, D. ^{[1
]}

Kawasaki, H. ^{[1
]}

Kikuchi, M. ^{[1
]}

Yamada, Y. ^{[1
]}

Nakanishi, S. ^{[2
]}

机构：

[1] Tokyo Denki Univ, Coll Sci & Engn, Div Sci, Hatoyama, Saitama 3500394, Japan

[2] Osaka Univ, Res Ctr Solar Energy Chem, Toyonaka, Osaka 5608531, Japan

来源：

GENERAL STUDENT POSTER SESSION | 2017年 / 75卷 / 52期

关键词：

ELECTROCHEMICAL OSCILLATIONS; NONCOVALENT INTERACTIONS; HYDROGEN-PEROXIDE; MECHANISM; SYSTEM; ELECTROOXIDATION; PLATINUM; SURFACES; AU;

D O I：

10.1149/07552.0113ecst

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 current due to the H2O2 reduction at Pt electrodes in H2SO4 solutions shows a period-1 oscillation in the potential region of upd-H. As reported before (ECS Transactions 69 (2015) 47), when Na2SO4 is added to the solutions, the oscillation exhibits bifurcation behavior: it changes into complex oscillations such as mixed-mode, chaotic, and period-n oscillations. We have tentatively suggested that a non-covalent interaction between adsorbed OH, which is the reaction intermediate of the H2O2 reduction, and Na+ plays a crucial role for the bifurcation. In this work, the complex oscillations are found to be caused by an impurity in a commercially available Na2SO4 reagent with a purity of 99.0%. The impurity is identified as Br- and its amount in the reagent is estimated to be more than 11 ppm. The bifurcation behavior can detect a trace of Br- in solutions containing a large amount of sulfate ions.

引用

页码：113 / 121

页数：9

共 27 条

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