Abstract
In this chapter, a mathematical model to simulate the impedance response of the gas diffusion layer (GDL) considering oxygen transport in the channels of the flow field plate of a polymer electrolyte membrane fuel cell (PEMFC) is presented. The mathematical treatment considered oxygen depletion along the channel at steady-state conditions and oscillating oxygen concentration in the channel during AC conditions. Parameters reported in the literature and extracted from the impedance response of a PEMFC operated at different oxygen stoichiometry assisted the simulation of the total impedance spectrum of the GDL and channel. The local GDL-channel impedance spectrum at different fractions of the channel length is simulated as well. It is possible to simulate the effect of oxygen stoichiometry on the total and local GDL-channel impedance spectrum. The effect of the amplitude of the oscillating contribution of the sinusoidal current on the impedance spectrum of the GDL-channel is simulated as well.
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