The effect of in-phase current and temperature oscillations on the impedance of the cathode catalyst layer in a PEM fuel cell

Abstract

An impedance model for the cathode catalyst layer (CCL) in a PEM fuel cell demonstrates that in-phase harmonic perturbations to the cell current density and CCL temperature lower both CCL impedance and static resistivity. This mitigation is primarily driven by the oscillating exchange current density of the oxygen reduction reaction.