Document Type

Article

Publication Date

11-2002

Publication Title

Journal of the Electrochemical Society

Abstract

Sustained potential oscillations are experimentally observed in a proton exchange membrane fuel cell with PtRu as anode catalyst and with H2/108ppm CO as the anode feed when operating under a constant current density mode. These oscillations appear at fuel-cell temperatures below 70°C. A threshold value exists for both the current density and the anode flow rate at a given fuel-cell temperature for their onset. The temperature dependence of the oscillation period shows an apparent activation energy around 60 kJ/mol. The potential oscillations are believed to be due to the coupling of anode electro-oxidation of H2 and CO on the PtRu catalyst surface, on which OHad is formed more readily, i.e., at lower overpotentials. A simple kinetic model is provided that can reproduce the observed oscillatory phenomenon both qualitatively and quantitatively.

Volume

149

Issue

11

First Page Number

A1423

Last Page Number

A1431

DOI

10.1149/1.1511752

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 (11), A1423-A1431.

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