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Experimental measurement of effective diffusion coefficient of gas diffusion layer/microporous layer in PEM fuel cells

机译：PEM燃料电池中气体扩散层/微孔层有效扩散系数的实验测量

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Accuracy in the effective diffusion coefficient of the gas diffusion layer (GDL)/microporous layer (MPL) is important to accurately predict the mass transport limitations for high current density operation of polymer electrolyte membrane (PEM) fuel cells. All the previous studies regarding mass transport limitations were limited to pure GDLs, and experimental analysis of the impact of the MPL on the overall diffusion in the porous GDL is still lacking. A modified Loschmidt cell with an oxygen-nitrogen mixture is used in this work to determine the effect of MPL on the effective diffusion coefficients. It is found that Knudsen effects play a dominant role in the diffusion through the MPL where pore diameters are less than 1 μm. Experimental results show that the effective diffusion coefficient of the MPL is only about 21% that of its GDL substrate and Knudsen diffusion accounts for 80% of the effective diffusion coefficient of the GDL with MPL measured in this study. No existing correlations can correlate the effective diffusion coefficient with significant Knudsen contribution.
机译：气体扩散层（GDL）/微孔层（MPL）的有效扩散系数的准确性对于准确预测聚合物电解质膜（PEM）燃料电池的高电流密度运行的质量传输限制很重要。以前有关传质限制的所有研究仅限于纯GDL，而仍然缺乏对MPL对多孔GDL中总扩散的影响的实验分析。在这项工作中使用带有氧气-氮气混合物的改良Loschmidt电池来确定MPL对有效扩散系数的影响。发现在孔径小于1μm的MPL扩散过程中，克努森效应起主要作用。实验结果表明，MPL的有效扩散系数仅为其GDL底物的21％，而Knudsen扩散占MPL的GDL有效扩散系数的80％。没有现有的相关性可以将有效扩散系数与重要的克努森贡献相关联。

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