多孔性
质子交换膜燃料电池
扩散
气体扩散
温度梯度
材料科学
复合材料
化学
化学工程
燃料电池
膜
热力学
生物化学
量子力学
物理
工程类
作者
Yuwen Liu,Shiyu Wu,Yanzhou Qin,Mengfei Zhang,Xin Liu,Yan Yin
标识
DOI:10.1080/15435075.2021.2007389
摘要
As a key component of proton exchange membrane (PEM) fuel cell, gas diffusion layer (GDL) plays an important role in mass transport process. In this study, the layered setting method is used to cut the GDL along the thickness direction, and the porosity of different layers is set to make it have porosity distribution along the thickness direction. The influence of five porosity distributions of GDL on the internal mass transport process and performance of fuel cell is studied. It is found that the porosity gradient and distribution shape of the GDL affects the effective diffusion coefficient of the reactant gas, and larger porosity gradient leads to poorer uniformity of the gas diffusion coefficient distribution, which is not conducive to the internal mass transport of fuel cell. When the porosity gradient of the GDL is smaller, the gas diffusion process occurs more uniformly, the electrochemical reaction rate is higher, and the performance of the fuel cell is better. In addition, the inverted “V” shaped porosity distribution along the thickness direction of the GDL is more conducive to the reactant gas transport and fuel cell performance than the “V” shaped porosity distribution.
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