Document Type

Article

Publication Date

6-2002

Publication Title

Journal of the Electrochemical Society

Abstract

The anode flow rate of a proton exchange membrane (PEM) fuel cell involving Pt anode electrocatalyst is found to strongly influence the single cell performance when H2 containing trace amounts of CO is used as the feed. The performance drops dramatically due to CO poisoning as the anode flow rate increases until a large overpotential is reached when it levels off. This effect of the flow rate on the extent of poisoning is found to be reversible and is explained as depending on the actual concentration of CO in the anode chamber which in turn depends on the feed content, the flow rate, and CO oxidation kinetics on Pt. Further, it is found that oxygen permeating across the PEM from the cathode side also appreciably affects the anode overpotential by providing another route for CO oxidation. A CO inventory model is provided that explains the observed phenomena in a PEM fuel cell operating with H2/CO as anode feed and a cathode feed with different oxygen pressures.

Volume

149

Issue

6

First Page Number

A765

Last Page Number

A772

DOI

10.1149/1.1475686

Publisher Statement

© The Electrochemical Society, Inc., 2002. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS). The archival version of this work was published in Journal of the Electrochemical Society 149 (6), A765-A772.

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