Investigation of methanol electrooxidation on Pt and Pt-Ru in H3PO4 using MEA with PBI-H3PO4 membrane

被引：6
|
作者：
Modestov, A. D. [1 ]
Tarasevich, M. R. [1 ]
Pu, Hongting [2 ]
机构：
[1] Russian Acad Sci, AN Frumkin Inst Phys Chem & Electrochem, Moscow 119071, Russia
[2] Tongji Univ, Inst Funct Polymers, Sch Mat Sci & Engn, Shanghai 201804, Peoples R China
来源：
JOURNAL OF POWER SOURCES | 2012年 / 205卷
关键词：
PBI; DMFC; Methanol; Electrooxidation; Pt; Pt-Ru; FUEL-CELL; IN-SITU; ELECTROCHEMICAL OXIDATION; TEMPERATURE-DEPENDENCE; CARBON-MONOXIDE; PLATINUM; CO; ELECTRODES; ACID; RUTHENIUM;
D O I：
10.1016/j.jpowsour.2012.01.089
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Electrochemical oxidation of methanol on Pt/C and Pt-Ru/C electrocatalysts was studied by slow scan rate voltammetry at 130-190 degrees C. The effects of partial pressures of water, methanol, and CO on the methanol electrooxidation rate were determined. It was found that methanol oxidation on Pt-Ru/C proceeds primarily via the "indirect" route through the formation of strongly adsorbed intermediate COads, while on Pt methanol electrooxidation occurs primarily via "direct" route through the formation of weakly adsorbed intermediates. At 140 degrees C activity of Pt-Ru/C in methanol electrooxidation was found 2 orders of magnitude higher than that of Pt/C. Methanol oxidation reaction orders per water and methanol vapor pressures were determined. The main features of methanol electrooxidation both on Pt and Pt-Ru were accounted for assuming Langmuir-Hinshelwood mechanism of respective RDS. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：207 / 214
页数：8
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