UNCONVENTIONAL SYMMETRY FACTOR AND TRANSFER-COEFFICIENT FOR OXYGEN REDUCTION AT IR ELECTRODES AND THEIR POSSIBLE USE AS DIAGNOSTIC-CRITERIA IN MECHANISTIC ANALYSIS

被引：7

作者：

SEPA, DB ^{[1
]}

VOJNOVIC, MV ^{[1
]}

STOJANOVIC, M ^{[1
]}

DAMJANOVIC, A ^{[1
]}

机构：

[1] ALLIED CORP,CORP TECHNOL,MORRISTOWN,NJ 07960

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 1987年 / 134卷 / 04期

关键词：

ACIDS; -; Solutions; ELECTRODES; Iridium;

D O I：

10.1149/1.2100584

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Oxygen reduction at iridium electrodes in acid solutions is characterized by two linear E-log i regions. In the high current-density (c. d. ) region with the Tafel slope of minus 120 mV, an unconventional symmetry factor is observed. It increases as temperature increases according to beta equals beta //0T. In low c. d. region with the Tafel slope of minus 60 mV, the transfer coefficient is also unconventional. It increases with temperature according to alpha equals alpha //0T. Such a transfer coefficient is not compatible with a slow chemical step as rate determining following first electron transfer step. It is compatible with a slow first charge transfer step under Temkin adsorption condition. It is suggested that this transfer coefficient is a sum of two symmetry factors both of which increase with temperature according to beta equals beta //0T.

引用

页码：845 / 848

页数：4

共 20 条

[1]

Bockris J.M., 1979, QUANTUM ELECTROCHEMI

[2] THE KINETICS OF THE HYDROGEN EVOLUTION REACTION AT MERCURY CATHODES - THE EFFECT OF TEMPERATURE, PH, AND PRESSURE ON HYDROGEN OVERPOTENTIAL IN AQUEOUS, MIXED AND METHANOLIC SOLUTIONS [J].