Porosity Distribution Optimization of Cathode Gas Diffusion Layer in PEM Fuel Cells Based on the Variational Principle
As an important component of the membrane electrode in proton exchange membrane fuel cell,the porosity of the gas diffusion layer has a significant impact on the cell performance.In this paper,a three-dimensional steady-state non-isothermal numerical model of the proton exchange membrane fuel cell(PEMFC)is established.Based on the variational principle,the optimized porosity distribution of the cathode gas diffusion layer is derived with the cathode diffusion layer water content as the optimization objective.The results show that the non-uniformly distributed porosity of the cathode gas diffusion layer is beneficial to the mass transfer of reactants and water in the cell,and meanwhile making the temperature distribution more even,which improves the cell performance.When the voltage is 0.3 V,the output cell current increased by 6.8％and the output power improved by 3.5％.
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