Dynamic behavior of a PEM fuel cell stack for stationary applications

We discuss the behavior and performance of a proton exchange membrane fuel cell stack under fast load commutations. We present experimental results for the polarization curves, energy balance sheet, and time response of the fuel cells. Although load transients are present both in the voltage and current generated, it is found that the fuel cell system response is faster than 0.15 a to load commutations. The experimental results were also compared to the Amphlett et al. and Kim et al. models, which were found to describe the data well. (C) 2001 International Association for Hydrogen Energy. Published by Elsevier Science Ltd. All rights reserved.