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Date of Publication:2022-10-07

Journal:太阳能学报

Issue:4

Page Number:368-374

ISSN No.:0254-0096

Abstract:A three-dimensional, non-isothermal mathematical model was developed for proton exchange membrane fuel cell (PEMFC) with conventional flow field. The electrochemical dynamics and the flow and transport phenomena of reactant gases in flow channel and porous media were considered in this model, and the electro-osmotic drag and diffusion effects of liquid water in membrane were investigated. The simulation results indicated that the local current density distribution of electrode and the output performance of fuel cell are determined by the limit of mass transfer of reactant gases and the water content in membrane. The net flux of water from anode to cathode occurs if the current densities higher than 0.3-0.4 A/cm2. And there were higher temperature gradients in membrane thickness direction, which had great effect on mass transfer performance of membrane.

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