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首页> 外文会议>Meeting of the Electrochemical Society >Impact of Porosity Gradients within Catalyst Layer and MPL of a PEM Fuel Cell on the Water Management and Performance: A Neutron Radiography Investigation
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Impact of Porosity Gradients within Catalyst Layer and MPL of a PEM Fuel Cell on the Water Management and Performance: A Neutron Radiography Investigation

机译：PEM燃料电池催化剂层和MPL在水管理和性能下的影响：中子放射照相调查

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The influence of porosity modification of both the cathode microporous layer (MPL) and catalyst layer (CL) of a low temperature polymer electrolyte membrane fuel cell (PEMFC) is studied with a neutron radiography technique to determine the water distribution and transport inside the cell. Three types of cathode MPLs with varying porosity distributions are made by introducing Chemisnow monodisperse spherical polymer particles with 1.5 μm and 30 μm diameters inside the MPL slurry. CLs with three different porosities are manufactured by incorporation of 0 to 10 wt.% polystyrene particles with 0.5 μm diameters. Water thicknesses are measured inside the cell components at relative humidity of 120% with an increasing current density up to 1 A/cm~2. The results indicate that introducing micro pores into the structure of the MPL and CL may lead to the extraction of the excess water through these pores, leaving smaller pores accessible for the reaction gases and better cell performance.
机译：用中子放射线照相技术研究了低温聚合物电解质电解质膜燃料电池（PEMFC）的阴极微孔层（MPL）和催化剂层（CL）的影响，以确定细胞内部的水分布和输送。通过在MPL浆料内引入1.5μm和30μm直径的ChemisNow Monodperse聚合物颗粒，制备具有不同孔隙率分布的三种类型的阴极MPLS。具有三种不同孔隙率的CLS通过掺入0至10重量％的聚苯乙烯颗粒而制造，其直径为0.5μm。在120％的相对湿度下测量水厚度在120％的电池组分中测量，电流密度增加至1A / cm〜2。结果表明，将微孔引入MPL和Cl的结构中，可以通过这些孔来提取过量水，留下较小的孔，可用于反应气体和更好的细胞性能。

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