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Microporous layer for water morphology control in PEMFC

机译:PEMFC中用于控制水形态的微孔层

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We have used environmental scanning electron microscope to observe vapor condensation and liquid water morphology and breakthrough in porous layers of polymer electrolyte membrane fuel cell. These suggest presence of large droplets and high liquid saturation at interface of the catalyst layer (CL) and gas diffusion layer (GDL), due to jump in pore size. We develop a model for morphology of liquid phase across multiple porous layers by use of both continuum and breakthrough (percolation) treatments. Using the results of this model we show the liquid morphologies deteriorate the efficiency of electrochemical reactions in CL and increase the water saturation in GDL. Then we show that inserting a microporous layer between CL and GDL reduces both the droplet size and liquid saturation and improves the cell performance.
机译:我们已经使用环境扫描电子显微镜观察了蒸汽凝结和液态水的形态以及聚合物电解质膜燃料电池多孔层中的突破。这些表明由于孔径的跳跃,在催化剂层(CL)和气体扩散层(GDL)的界面处存在大液滴和高液体饱和度。我们通过使用连续体和突破(渗流)处理,开发了多个多孔层中液相形态的模型。使用该模型的结果,我们表明液体形态降低了CL中电化学反应的效率,并增加了GDL中的水饱和度。然后,我们表明在CL和GDL之间插入微孔层可减少液滴大小和液体饱和度,并改善电池性能。

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