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首页> 外文会议>11th fuel cell science, engineering, and technology conference 2013 >IN-PLANE MICROSTRUCTURE OF GAS DIFFUSION LAYERS WITH DIFFERENT PROPERTIES FOR PEFC
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IN-PLANE MICROSTRUCTURE OF GAS DIFFUSION LAYERS WITH DIFFERENT PROPERTIES FOR PEFC

机译：PEFC不同性质的气体扩散层的面内微观结构

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摘要

Gas diffusion layer (GDL) is undoubtedly one of the most complicated components used in a polymer electrolyte fuel cell (PEFC) in terms of liquid and gas transport phenomena. An appropriate fuel cell design seeks a fundamental study of this tortuous porous component. Currently, porosity and gas permeability have been known as some of the key parameters affecting liquid and gas transport through GDL. Although these are dominant parameters defining mass transport through porous layers, there are still many other factors affecting transport phenomena as well as overall cell performance. In this work, microstructural properties of Toray carbon papers with different thicknesses and for polytetrafluoroethylene (PTFE) treated and untreated cases have been studied based on scanning electron microscopy (SEM) image analysis. Water droplet contact angle as a dominant macro-scale property as well as mean pore diameter, pore diameter distribution, and pore roundness distribution as important micro-scale properties have been studied. It was observed that the mean pore diameter of Toray carbon paper does not change with its thickness and PTFE content. Mean pore diameter for Toray carbon papers was calculated to be around 26μm regardless of their thicknesses and PTFE content. It was also observed that droplet contact angle on GDL surface does not vary with GDL thickness. The average contact angle for 10 wt.% PTFE treated GDLs of different thicknesses was measured about 150°. Finally, the heterogeneous in-plane PTFE distribution on the GDL surface was observed to have no effect on mean pore diameter of GDLs.
机译：就液体和气体传输现象而言，气体扩散层（GDL）无疑是聚合物电解质燃料电池（PEFC）中使用的最复杂的组件之一。适当的燃料电池设计寻求对该弯曲多孔部件的基础研究。目前，孔隙率和气体渗透率已被认为是影响通过GDL输送液体和气体的一些关键参数。尽管这些是决定通过多孔层的质量传输的主要参数，但仍有许多其他因素影响传输现象以及整体电池性能。在这项工作中，基于扫描电子显微镜（SEM）图像分析，研究了不同厚度的Toray碳纸的微观结构特性以及聚四氟乙烯（PTFE）处理和未处理的情况。已经研究了作为主要的宏观性质的水滴接触角以及作为重要的微观性质的平均孔径，孔径分布和圆度分布。据观察，东丽碳纸的平均孔径不会随其厚度和PTFE含量而变化。不论厚度和PTFE含量如何，Toray碳纸的平均孔径均约为26μm。还观察到，GDL表面上的液滴接触角不随GDL厚度而变化。测量不同厚度的10 wt。％PTFE处理的GDL的平均接触角约为150°。最后，观察到在GDL表面上的异质面内PTFE分布对GDL的平均孔径没有影响。

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  • 会议地点 Minneapolis MN(US)
  • 作者

    Mehdi Mortazavi; Kazuya Tajiri;

  • 作者单位

    Multiscale Transport Process Laboratory Mechanical Engineering-Engineering Mechanics Michigan Technological University Houghton, Michigan 49931;

    Mechanical Engineering-Engineering Mechanics Michigan Technological University Houghton, Michigan, 49931;

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  • 正文语种 eng
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