A MICROELECTRODE STUDY OF OXYGEN REDUCTION AT THE PLATINUM/RECAST-NAFION FILM INTERFACE

被引：110

作者：

URIBE, FA

SPRINGER, TE

GOTTESFELD, S

机构：

[1] Electronics Research Group, Los Alamos National Laboratory, Los Alamos

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 1992年 / 139卷 / 03期

关键词：

D O I：

10.1149/1.2069299

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

We describe a study of the oxygen reduction kinetics at the Pt/recast Nafion(R) interface employing a minicell based on a filmed microelectrode. The experimental conditions are identical to those in polymer-electrolyte fuel cells in that the recast ionomer electrolyte is exposed only to water vapor. We find that the interfacial rate of oxygen reduction near 0.9 V is similar for the Pt/recast ionomer interface and for Pt immersed in dilute aqueous acid solutions. A significant loss of oxygen reduction activity occurs when the recast ionomer electrolyte loses water. We discuss a possible evaluation of catalyst utilization in polymer electrolyte fuel cells.

引用

页码：765 / 773

页数：9

共 27 条

[1]

ALLEN PG, 1991, ELECTROCHEMICAL SOC, V912, P1130

[2]

CARSLAW HS, 1980, CONDUCTION HEAT SOLI, P215

[3] ACTIVATION PARAMETERS FOR OXYGEN REDUCTION KINETICS IN TRIFLUOROMETHANE SULFONIC-ACID SYSTEMS [J].