Impedance study of methanol oxidation on platinum electrodes

被引：116

作者：

Seland, Frode

Tunold, Reidar

Harrington, David A. ^{[1
]}

机构：

[1] Univ Victoria, Dept Chem, Victoria, BC V8W 3V6, Canada

[2] Norwegian Univ Sci & Technol, Electrochem Grp, Dept Mat Sci & Engn, NO-7491 Trondheim, Norway

来源：

ELECTROCHIMICA ACTA | 2006年 / 51卷 / 18期

关键词：

impedance; methanol oxidation; platinum; ac voltammetry; nucleation and growth;

D O I：

10.1016/j.electacta.2005.10.050

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Methanol oxidation on Pt electrodes is studied by ac voltammetry. Data from voltammograms at frequencies from 0.5 Hz to 20 kHz are assembled into electrochemical impedance spectra and analysed using equivalent circuits. Inductive behavior and negative relaxation times are attributed to nucleation and growth behavior. The rate-determining step is proposed to be the reaction of adsorbed CO and OH at the edge of islands of OH, with competition between OH and CO adsorption for the released reaction sites. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：3827 / 3840

页数：14

共 69 条

[1] The effect of anode flow characteristics and temperature on the performance of a direct methanol fuel cell [J].