Investigation of reactant transport within a polymer electrolyte fuel cell using localised CO stripping voltammetry and adsorption transients

被引:23
作者
Brett, DJL
Atkins, S
Brandon, NP
Vesovic, V
Vasileiadis, N
Kucernak, AR [1 ]
机构
[1] Univ London Imperial Coll Sci Technol & Med, Dept Chem, London SW7 2AZ, England
[2] Univ London Imperial Coll Sci Technol & Med, Dept Chem Engn, London SW7 2AZ, England
[3] Univ London Imperial Coll Sci Technol & Med, Dept Earth Sci & Engn, London SW7 2AZ, England
基金
英国工程与自然科学研究理事会;
关键词
polymer electrolyte fuel cell; CO stripping; reactant distribution; adsorption transient;
D O I
10.1016/j.jpowsour.2004.02.007
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
The distribution of carbon monoxide (CO) within a simple one dimensional polymer electrolyte fuel cell (PEFC) is studied experimentally using localised stripping voltammetry and adsorption transients. The effect of varying the carrier gas flow rate and CO dosage is investigated. It is found that residence time within the fuel cell is the key factor in determining the extent of poisoning or CO adsorption. Low flow rates are seen to result in a more anisotropic distribution of CO with greater amounts found away from the channel. High flow rates lead to a much more uniform profile. Diffusion of reactant into the gas distribution layer (GDL) and adsorption onto the catalyst retards the flow of reactant down the channel which broadens the peak width of the bulk adsorption transient. With knowledge of the catalyst roughness factor, pseudo 2-D reactant distribution profiles can be derived. These diagrams provide the equivalent of 'snap-shots' of the flow of reactants through the simple one dimensional fuel cell. This technique has applications in optimising the lateral distribution of catalyst and MEA properties such as GDL porosity. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:205 / 213
页数:9
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