Consumption rate of Pt under potential cycling

被引:148
作者
Mitsushima, Shigenori [1 ]
Kawahara, Shuya [1 ]
Ota, Ken-ichiro [1 ]
Kamiya, Nobuyuki [1 ]
机构
[1] Yokohama Natl Univ, Dept Energy & Safety Engn, Hodogaya Ku, Yokohama, Kanagawa 2408501, Japan
关键词
D O I
10.1149/1.2400596
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
The consumption rate of Pt in sulfuric acid under potential cycling has been investigated in 1 mol dm(-3) H2SO4 at 40 degrees C as a basic study to understand the consumption rate of the electrocatalyst of polymer electrolyte fuel cells. With a higher potential limit, EH was 1.5 V vs reversible hydrogen electrode ( RHE ), the consumption rate was a few ng cm(-2) cycle(-1) for rectangular and symmetric triangular waves, and the consumption rate increased with the EH up to 1.8 V vs RHE. Among the triangular waves between 0.5 to 1.8 V vs RHE, the consumption rate of symmetric waves and fast cathodic asymmetric triangular waves were a few ng cm(-2) cycle(-1). However, the slow cathodic triangular wave, which were 20 V s(-1) anodic and 0.5 V s(-1) cathodic, showed 24 ng cm(-2) cycle(-1) consumption rate. The ratio in the difference of charge to the consumption showed that the electron transfer number was about 2 for the slow cathodic triangular wave, and that of the electron transfer number was about 4 for the symmetric waves and the fast cathodic triangular waves. Therefore, PtO2 + 4H(+) + 2e(-). Pt2+ + 2H(2)O that follows the Pt oxidation, Pt + 2H(2)O. PtO2 + 4H(+) + 4e(-) would occur under the enhanced condition, and Pt. Pt4+ + 4e(-) would occur under symmetric conditions. (c) 2006 The Electrochemical Society.
引用
收藏
页码:B153 / B158
页数:6
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