Abstract
We report a model for impedance Zh of oxygen transport in a PEMFC channel. Analytical solution for Zh is derived and a simple approximate equation for the summit frequency of Zh arc is obtained. In the limit of zero frequency of AC signal, a rather cumbersome expression for Zh reduces to a simple equation for the cell resistivity due to oxygen transport in the channel: , where b is the ORR Tafel slope per exponential basis, λ is the stoichiometry of the oxygen (air) flow, and J is the mean current density in the cell.
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