Temperature dependence of the oxygen reduction kinetics on RuxSey/C catalysts

被引：11
|
作者：
Leveratto, D. [1 ]
Racz, A. [1 ]
Savinova, E. R. [1 ]
Stimming, U. [1 ]
机构：
[1] Tech Univ Munich, Dept Phys, D-85748 Garching, Germany
来源：
FUEL CELLS | 2006年 / 6卷 / 3-4期
关键词：
activation enthalpy; electrochemical oxygen reduction reaction; ORR; pre-exponential factor; reaction kinetics; RuxSey/C catalyst; temperature dependence; transfer coefficient;
D O I：
10.1002/fuce.200600015
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The temperature dependence of the oxygen reduction kinetics on carbon-supported RuxSey catalysts is studied using a rotating disc electrode in 0.5 M H2SO4 in the temperature interval from 25 degrees C to 65 degrees C. When the absolute value of the overpotential is below ca. 0.65 V, the reaction is limited by a one-election charge transfer step where the transfer coefficient is independent of the temperature and equal to 0.44. The apparent activation enthalpy at zero over-potential is 0.49 eV and the pre-exponential factor is independent of the temperature.
引用
收藏
页码：203 / 207
页数：5
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