CO and CO/H2 electrooxidation on carbon supported Pt-Ru catalyst in phosphotungstic acid (H3PW12O40) electrolyte

被引：27

作者：

Aricò, AS ^{[1
]}

Modica, E ^{[1
]}

Ferrara, I ^{[1
]}

Antonucci, V ^{[1
]}

机构：

[1] CNR, Inst Transformat & Storage Energy, I-98126 Messina, Italy

来源：

JOURNAL OF APPLIED ELECTROCHEMISTRY | 1998年 / 28卷 / 09期

关键词：

CO electrooxidation; Pt-Ru catalyst; phosphotungstic acid; reaction orders; activation energy; Tafel slopes;

D O I：

10.1023/A:1003456119509

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

An electrode-kinetic study of the oxidation of CO and CO/H-2 mixtures on a Pt-Ru/C catalyst was carried out in phosphotungstic acid (PWA) electrolyte. The influence of temperature, CO partial pressure and proton concentration on the electrochemical oxidation rate was investigated, An apparent activation energy of about 50 kJ mol(-1) was found for CO oxidation at 0.6 V vs NHE. Fractional reaction orders close to 0.5 and -0.4 with respect to carbon monoxide and proton concentration, respectively, were observed, Tafel slopes were close to 136 mV dec(-1) at 70 degrees C for both CO and CO/H-2 oxidation. The PWA electrolyte appeared to promote the methanol electrooxidation by increasing the rate of water discharge at the electrode.

引用

页码：881 / 887

页数：7

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