Abstract
A 1-D macro-homogeneous model of the PEMFC is presented with the ability to simulate electrochemical impedance spectroscopy (EIS). The model is shown to reproduce the inductive loop seen at low frequencies at moderate to high current densities. Based on the model, this feature of EIS can be assigned to modulation of membrane conductivity due to water buildup. In addition, the model is compared to experimental polarization data and EIS at low oxygen concentrations to evaluate the oxygen reduction reaction kinetics at high overpotential and oxygen transport limitations under non-condensing conditions. The results suggest that a lower reaction order and dual Tafel slope may be necessary to best describe experimental results.
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