Investigation of hydrogen adsorption behaviours in the presence of methanol and dissolved oxygen using electrochemical quartz crystal microbalance

被引：10

作者：

Kim, D

Jung, I

Lee, H

Oh, I

Ha, H

Tak, Y ^{[1
]}

机构：

[1] Inha Univ, Dept Chem Engn, Inchon 402751, South Korea

[2] Res Inst Ind Sci & Technol, Water Proctect Res Team, Pohang 790330, South Korea

[3] Korea Inst Sci & Technol, Fuel Cell Res Ctr, Seoul 130650, South Korea

来源：

ELECTROCHIMICA ACTA | 2004年 / 50卷 / 2-3期

关键词：

oxygen reduction; methanol oxidation; hydrogen adsorption and desorption; in situ EQCM(1);

D O I：

10.1016/j.electacta.2003.12.074

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

In the presence of methanol and dissolved oxygen, hydrogen adsorption and reduction behaviours on electrodeposited Pt electrode were investigated with cyclic voltammetry and in situ electrochemical quartz crystal microbalance. Specific hydrogen adsorptions occur at two different cathodic potentials and its adsorption at low cathodic potential is suppressed by oxygen adsorption. After methanol oxidation occurred on Pt electrode, part of Pt surface is covered with reaction intermediate, CO, which blocks the adsorption of hydrogen and oxygen. Measurement of reaction currents and mass changes during cyclic voltammetry and potentiostatic oxygen reduction suggested that the amount of hydrogen adsorption decreases significantly and specific hydrogen adsorption steps are altered, which resulted in the decrease of oxygen reduction. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：693 / 697

页数：5

共 17 条

[1] The degree and effect of methanol crossover in the direct methanol fuel cell [J].