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Five parameters of a model of a polymer electrolyte membrane fuel cell (PEMFC) cathode (the volume fraction of gas pores in the gas diffusion layer, the volume fraction of gas pores in the catalyst layer, the exchange current density of the oxygen reduction reaction, the effective ionic conductivity of the electrolyte, and the ratio of the effective diffusion coefficient of oxygen in a flooded spherical agglomerate particle to the square of that particle radius) were determined by least-squares fitting of experimental polarization curves. The values of parameters obtained in this work indicate that ionic conduction and gas-phase transport are two processes significantly influencing the performance of PEMFC air cathodes. While ionic conduction influences cathode performance over a wide range of current densities, gas-phase transport influences cathode performance only at high current densities


© The Electrochemical Society, Inc. 2004. 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

Guo, Q., Sethuraman, V.A., & White, R.E. (2004). Parameter Estimates for a PEMFC Cathode. Journal of the Electrochemical Society, 151(7): A983-A993.

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