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首页> 外文期刊>Transport in Porous Media >Inhomogeneous Distribution of Polytetrafluorethylene in Gas Diffusion Layers of Polymer Electrolyte Fuel Cells
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Inhomogeneous Distribution of Polytetrafluorethylene in Gas Diffusion Layers of Polymer Electrolyte Fuel Cells

机译：聚四氟乙烯在聚合物电解质燃料电池气体扩散层中的不均匀分布

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摘要

Polymer electrolyte fuel cells require gas diffusion layers that can efficiently distribute the feeding gases from the channel structure to the catalyst layer on both sides of the membrane. On the cathode side, these layers must also allow the transport of liquid product water in a counter flow direction from the catalyst layer to the air channels where it can be blown away by the air flow. In this study, two-phase transport in the fibrous structures of a gas diffusion layer was simulated using the lattice Boltzmann method. Liquid water transport is affected by the hydrophilic treatment of the fibers. Following the assumption that polytetrafluorethylene is preferably concentrated at the crossings of fibers, the impact of its spatial distribution is analyzed. Both homogeneous and inhomogeneous distribution is investigated. The concentration of polytetrafluorethylene in the upstream region is of advantage for the fast transport of liquid water through the gas diffusion layer. Special attention is given to the topmost fiber layer. Moreover, polytetrafluorethylene covering the fibers leads to large contact angles.
机译：聚合物电解质燃料电池需要气体扩散层，其可以有效地将馈送气体从通道结构分布到膜的两侧的催化剂层。在阴极侧，这些层还必须允许将液体产物水从催化剂层输送到空气通道的空气通道中。在该研究中，使用晶格Boltzmann方法模拟气体扩散层的纤维结构中的两相传输。液体水运输受到纤维的亲水处理的影响。在假设聚四氟乙烯优选浓缩在纤维的交叉处，分析其空间分布的影响。研究了均匀和不均匀的分布。上游区域中聚四氟乙烯的浓度对于通过气体扩散层的快速运输液态水是有利的。特别注意最顶层的光纤层。此外，覆盖纤维的聚四氟乙烯导致大的接触角。

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