微型多孔材料
质子交换膜燃料电池
降级(电信)
化学
催化作用
介电谱
化学工程
图层(电子)
膜
欧姆接触
大规模运输
扩散层
扩散
电化学
材料科学
电极
有机化学
热力学
工程类
物理化学
物理
电信
工程物理
生物化学
计算机科学
作者
Yongtaek Lee,Bosung Kim,Yongchan Kim,Xianguo Li
标识
DOI:10.1016/j.jpowsour.2010.10.028
摘要
The gas diffusion layer (GDL) covered with a microporous layer (MPL) is being widely used in proton exchange membrane fuel cells (PEMFCs). However, the effect of MPL on water transport is not so clear as yet; hence, many studies are still being carried out. In this study, the effect of MPL on the performance degradation of PEMFCs is investigated in repetitive freezing conditions. Two kinds of GDL differentiated by the existence of MPL are used in this experiment. Damage on the catalyst layer due to freezing takes place earlier when GDL with MPL is used. More water in the membrane and catalyst layer captured by MPL causes permanent damage on the catalyst layer faster. More detailed information about the degradation is obtained by electrochemical impedance spectroscopy (EIS). From the point of view that MPL reduces the ohmic resistance, it is effective until 40 freezing cycles, but has no more effect thereafter. On the other hand, from the point of view that MPL enhances mass transport, it delays the increase in the mass transport resistance.
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