Multicomponent diffusion in a gas-diffusion electrode with a ribbed flow field using the quasipotential transformation

摘要

We present a mathematical model of a gas-diffusion electrode adjacent to a ribbed current collector. The quasiptoential transformation is used to reduce the problem, governed by the Stefan-Maxwell equations and Darcy's law, to the s oluton of Laplace's equation sujbect to nonlinear boundary conditions. A Schwarz-Christoffel transformation is used to transform the flow field into a smpler fectangular region. Separation of variables is then used to express the current on the electrode as a Fourier series. The model is applied to the problem of anhydrous hydrogen chloride electrysis in a solid-polymer-electrolyte cell. Polarization curves, current distributions, and contours of reactant pressure in the gas-diffusion electrode are presented and discussed.