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.

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页码：113 / 121

页数：9

相关论文

共 27 条

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

Mukouyama, Y ;

Nakanishi, S ;

Konishi, H ;

Nakato, Y .

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1999, 473 (1-2) :156-165

[12] Mechanism and simulation of electrochemical current oscillations observed in the H2O2-reduction reaction on platinum electrodes in acidic solutions [J].

Mukouyama, Y ;

Hommura, H ;

Nakanishi, S ;

Nishimura, T ;

Konishi, H ;

Nakato, Y .

BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, 1999, 72 (06) :1247-1254

[13] Positive feedback mechanism, autocatalysis mechanism, and dependence on atomic-level surface structures in electrochemical oscillations for H2O2 reduction on Pt electrodes [J].

Mukouyama, Y ;

Nakanishi, S ;

Nakato, Y .

BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, 1999, 72 (12) :2573-2590

[14] New-type electrochemical oscillation caused by electrode - Surface inhomogeneity and electrical coupling as well as solution stirring through electrochemical gas evolution reaction [J].

Mukouyama, Y ;

Nakanishi, S ;

Konishi, H ;

Ikeshima, Y ;

Nakato, Y .

JOURNAL OF PHYSICAL CHEMISTRY B, 2001, 105 (44) :10905-10911

[15] Mechanisms of two electrochemical oscillations of different types, observed for H2O2 reduction on a Pt electrode in the presence of a small amount of halide ions [J].

Mukouyama, Y ;

Nakanishi, S ;

Chiba, T ;

Murakoshi, K ;

Nakato, Y .

JOURNAL OF PHYSICAL CHEMISTRY B, 2001, 105 (30) :7246-7253

[16]

Mukouyama Y., 2015, Electrochem. Soc, V64, P49

[17]

Mukouyama Y., 2015, ECS T, V64, P11

[18] Transient chaotic behavior during simultaneous occurrence of two electrochemical oscillations [J].

Mukouyama, Yoshiharu ;

Kawasaki, Hirokazu ;

Hara, Daisuke ;

Nakanishi, Shuji .

JOURNAL OF SOLID STATE ELECTROCHEMISTRY, 2015, 19 (11) :3253-3263

[19] 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 [J].

Nakanishi, S ;

Mukouyama, Y ;

Karasumi, K ;

Imanishi, A ;

Furuya, N ;

Nakato, Y .

JOURNAL OF PHYSICAL CHEMISTRY B, 2000, 104 (17) :4181-4188

[20] Promoted dissociative adsorption of hydrogen peroxide and persulfate ions and electrochemical oscillations - Caused by a catalytic effect of adsorbed bromine [J].

Nakanishi, S ;

Sakai, S ;

Hatou, M ;

Fukami, K ;

Nakato, Y .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2003, 150 (01) :E47-E51