Mass Transfer in Microporous Layers for Polymer Electrolyte Fuel Cells Analyzed with Pore Network Modeling
Mass Transfer in Microporous Layers for Polymer Electrolyte Fuel Cells Analyzed with Pore Network Modeling
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使用孔隙网络建模分析聚合物电解质燃料电池微孔层中的传质
DOI：
10.1149/10408.0129ecst
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发表时间：
2021
期刊：
影响因子：
--
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
将微孔层（MPL）施加到聚合物电解质燃料电池（PEFC，PEMFC）的气体扩散层基底的催化剂层（CL）侧，有效地减轻了CL处的液态水积聚，该液态水积聚抑制了氧向阴极CL的输送（溢流）。为了阐明两相流对MPL中氧气传输的影响，以优化设计，我们模拟了三维多孔结构的内部疏水性MPL的孔网络模型（PNM）对流空气渗透和氧气扩散与液态水饱和度。通过聚焦离子束扫描电子显微镜（FIB-SEM）获得的孔径分布用于构建PNM。氧气扩散测量，通过使用气相色谱仪与改变润湿液体饱和度，以及空气渗透测量，验证PNM。
The application of a microporous layer (MPL) to the catalyst layer (CL) side of the gas diffusion layer substrate of a polymer electrolyte fuel cell (PEFC, PEMFC) is effective to mitigate liquid water accumulation at the CL that inhibits oxygen transport to the cathode CL (Flooding). To elucidate the effects of two-phase flow on the oxygen transport in an MPL for its optimized designs, we have modeled three-dimensional porous structures of in-house hydrophobic MPLs with pore network models (PNMs) for convective air permeation and oxygen diffusion with liquid water saturation. Pore diameter distributions derived by a focused ion beam scanning electron microscope (FIB-SEM) are used to construct the PNMs. Oxygen diffusion measurements by using gas chromatography with changing wetting liquid saturation, as well as air permeation measurements, validate the PNMs.