Kinetics of methanol electrooxidation on Pt/C and PtRu/C catalysts

被引：11

作者：

Diaz, V. ^{[1
]}

Ohanian, M. ^{[1
]}

Zinola, C. F. ^{[2
]}

机构：

[1] Univ Republica, Fac Ingn, Inst Ingn Quim, Montevideo 11300, Uruguay

[2] Univ Republica, Fac Ciencias, Lab Electroquim Fundamental, Montevideo 11400, Uruguay

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2010年 / 35卷 / 19期

关键词：

Carbon-supported electrodes; Electrocatalysis; Methanol fuel cells; Kinetic model; CONCENTRATED PHOSPHORIC-ACID; SOLID ELECTRODE SURFACES; PLATINUM-ELECTRODES; ELECTROCATALYTIC ACTIVITY; AU NANOPARTICLES; OXYGEN REDUCTION; AQUEOUS-MEDIA; FORMIC-ACID; OXIDATION; RU;

D O I：

10.1016/j.ijhydene.2010.07.135

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：

This paper analyzes the performance of platinum and platinum:ruthenium carbon-supported catalysts modified by the application of in-situ cathodic polarizations towards the methanol oxidation reaction. These new electrodes are characterized by electrochemical techniques together with transmission electron microscopy images to envisage the dispersion of the catalyst. We measure methanol electrooxidation current transients, fitting the results with a general kinetic equation for a mixed mass and charge transfer processes for adsorbed reactant species. The kinetic equation also helps to predict the exponent of the chronoamperometric decay as directly related to the fractal dimension of the catalyst surface and to discuss the possible processes involved in the electrocatalytic reaction. (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.

引用

页码：10539 / 10546

页数：8

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