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A model for impedance of a PEM fuel cell cathode catalyst layer undersimultaneous application of potential and oxygen concentration perturbations isdeveloped and solved. The resulting expression demonstrates dramatic loweringof the layer impedance under increase in the amplitude of the oxygenconcentration perturbation. In--phase oscillations of the overpotential andoxygen concentration lead to formation of a fully transparent to oxygensub--layer. This sub--layer works as an ideal non polarizable electrode, whichstrongly reduces the system impedance.

Performance of a PEM fuel cell cathode catalyst layer under oscillating potential and oxygen supply