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MES research in electrode, membrane. Abstract A model for the transient electrochemical performance of a ...

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Abstract

Abstract A model for the transient electrochemical performance of a conical pore in the cathode catalyst layer of a low–Pt PEM fuel cell is developed. The pore is separated from the Pt surface by a thin ionomer film. A transient equation for the oxygen diffusion along the pore coupled to the proton conservation equation in the ionomer film is derived. Numerical solution of the static equations shows superior electrochemical performance of a conical pore as compared to cylindrical pore with equivalent electrochemically active surface area. Equations for the pore impedance are derived by linearization and Fourier–transform of transient equations. The conical pore impedance is calculated and compared to the impedance of equivalent cylindrical pore. It is shown that the pore shape affects the frequency dependence of impedance.

Keywords

Conical surfaceProton exchange membrane fuel cellElectrical impedanceTransient (computer programming)CathodeElectrochemistry

Identifiers

DOI
10.1002/elsa.202300006
Journal
Electrochemical Science Advances
Year
2024