Pore Network Modeling of a Microporous Layer for Polymer Electrolyte Fuel Cells under Wet Conditions
Pore Network Modeling of a Microporous Layer for Polymer Electrolyte Fuel Cells under Wet Conditions
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潮湿条件下聚合物电解质燃料电池微孔层的孔网络建模
DOI：
10.1016/j.jpowsour.2023.232677
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发表时间：
2023
影响因子：
9.2
通讯作者：
Tatsumi Kitahara
中科院分区：
文献类型：
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作者：
Hironori Nakajima;Shintaro Iwasaki;Tatsumi Kitahara
已经开发了聚合物电解质燃料电池的气体扩散层（GDL），其中在其催化剂层（CL）侧中应用微孔层（MPLS）以减轻CL中液态水的积聚以将氧输送到阴极CL。我们的内部疏水MPL的三维多孔结构的数值模拟与孔隙网络模型（PNM）。对流透气性和氧气扩散，这取决于液体饱和度，进行了评估。为了构建PNM，使用聚焦离子束扫描电子显微镜（FIB-SEM）来获得孔径分布（PSD）。该模型通过空气渗透率和氧扩散率测试与控制饱和度的非挥发性润湿液体，是稳定的疏水MPL的异位验证。通过确定实验中浓度边界层和GDL衬底的扩散阻力，得到了MPL的氧扩散系数。该模型预测了MPL中液态水饱和度对空气和液态水渗透以及氧扩散的影响，从而可用于设计实际电池的最佳PSD。
The gas diffusion layers (GDLs) of polymer electrolyte fuel cells have been developed with applying microporous layers (MPLs) in their catalyst layer (CL) side to alleviate the accumulation of liquid water in the CL for oxygen transport to the cathode CL. A three-dimensional porous structure of our in-house hydrophobic MPL is numerically modeled with a pore network model (PNM). The convective air permeability and oxygen diffusivity, which depend on liquid saturation, are evaluated. To construct the PNM, focused ion beam scanning electron microscopy (FIB-SEM) is used to derive the pore size distribution (PSD). The model is ex-situ validated through air permeability and oxygen diffusivity tests with controlled saturation of non-volatile wetting liquid that is stable in the hydrophobic MPL. Oxygen diffusivity of the MPL is obtained by identifying the diffusion resistances of the concentration boundary layers and GDL substrate in the tests. The model predicts the effects of liquid water saturation in the MPL on the air and liquid water permeations, and the oxygen diffusion, and thus can be used to design optimal PSDs for practical cells.