阴极
阳极
材料科学
饱和(图论)
电导率
极化(电化学)
化学工程
氢
润湿
膜
水运
质子交换膜燃料电池
电极
分析化学(期刊)
水流
复合材料
化学
色谱法
环境工程
环境科学
生物化学
数学
有机化学
组合数学
工程类
物理化学
作者
Sen Huo,Jae Wan Park,Pengfei He,Dawei Wang,Kui Jiao
标识
DOI:10.1016/j.ijheatmasstransfer.2017.04.137
摘要
Alkaline anion exchange membrane fuel cell (AEMFC) has been recognized as a promising zero-emission power source for portable, mobile and stationary application in recent years. To ensure high ionic conductivity and efficient reactants delivery, water management is regarded as one of the most critical issues for AEMFC. In this study, an analytical model is formulated to investigate the effect of electrode wettability on the water transport and resultant AEMFC performance. The pressure continuity method is considered to simulate liquid saturation jump on the interfaces of adjacent electrode layers. The results show that decreasing the cathode catalyst layer (CL) contact angle improves the performance because more water can be kept in the cathode CL decreasing polarization losses. The anode micro porous layer (MPL) is generally helpful, by forcing the liquid water to back-diffuse to the cathode. However, cathode MPL hinders the water transport to the cathode CL, leading to a lower reaction rate and membrane conductivity. The liquid water injection into the cathode has great potential to further improve the performance of AEMFC, however it may cause flooding in the flow channel and GDL. The cathode reaction kinetics should be considered as one of the most significant factors dragging the cell performance.
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