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首页> 外文会议>11th fuel cell science, engineering, and technology conference 2013 >EFFECTS OF COMPRESSION ON GDL MICROSTRUCTURE BY HIGH-RESOLUTION X-RAY COMPUTED TOMOGRAPHY
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EFFECTS OF COMPRESSION ON GDL MICROSTRUCTURE BY HIGH-RESOLUTION X-RAY COMPUTED TOMOGRAPHY

机译：X射线计算机断层扫描显示压缩对GDL微观结构的影响

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摘要

Transport phenomena within gas diffusion layers (GDLs) of of proton exchange membrane fuel cells (PEMFCs) are crucially important for an optimum PEM fuel cell performance. The microstructure properties of the GDLs, such as porosity, tortuosity and pore size distribution govern the transport of fluid, heat and charge. Additionally, PEM fuel cells are assembled under high compression pressure to minimize the contact resistance between components. The compression significantly alters the microstructure of the GDLs, and affects the cell performance substantially by blocking the pathways of liquid and gas species to and from the catalyst layer reaction sites. This study gives detailed understanding on the effect of compression on a GDL microstructure using high resolution X-ray Computed Tomography. Porosity distributions were shown when the GDL is compressed. A significant GDL penetration into the gas channel was observed at high compression pressures.
机译：质子交换膜燃料电池（PEMFC）的气体扩散层（GDL）内的传输现象对于优化PEM燃料电池性能至关重要。 GDL的微观结构特性（例如孔隙率，曲折度和孔径分布）控制着流体，热量和电荷的传输。另外，PEM燃料电池在高压缩压力下组装，以最大程度地减少组件之间的接触电阻。压缩显着改变了GDL的微观结构，并通过阻止液体和气体种类进出催化剂层反应位点的途径而实质上影响了电池性能。这项研究使用高分辨率X射线计算机断层扫描技术对压缩对GDL微结构的影响提供了详细的了解。当压缩GDL时，显示出孔隙率分布。在高压缩压力下，观察到GDL大量渗入气体通道。

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  • 会议地点 Minneapolis MN(US)
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    Navvab Khajeh Hosseini D.; Takashi Tokumasu; Takashi Sasabe; Ugur Pasaogullari;

  • 作者单位

    Department of Mechanical Engineering, Center for Clean Energy Engineering, University of Connecticut, Storrs, Connecticut 06269-5233, USA;

    Institute of Fluid Science, Tohoku University, Sendai,Miyagi 980-8577, Japan;

    Institute of Fluid Science, Tohoku University, Sendai,Miyagi 980-8577, Japan;

    Department of Mechanical Engineering, Center for Clean Energy Engineering, University of Connecticut, Storrs, Connecticut 06269-5233, USA;

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