努森扩散
多孔性
催化作用
扩散
直接甲醇燃料电池
材料科学
甲醇
扩散层
化学工程
努森数
图层(电子)
电极
分析化学(期刊)
化学
复合材料
热力学
色谱法
物理化学
有机化学
工程类
物理
阳极
作者
Jinghui Jiang,Xianda Sun
出处
期刊:Journal of electrochemical energy conversion and storage
[ASME International]
日期:2021-03-18
卷期号:19 (1)
被引量:2
摘要
Abstract Constructing the ordered catalyst layer is one of the most effective strategies to maximize the catalyst utilization in direct methanol fuel cells (DMFCs). To gain insight into the mass and charge transports in ordered catalyst layer, herein, a two-dimensional two-phase mass-transport model involving Knudsen diffusion was proposed. It is found that the simulation results of the model with Knudsen diffusion are more consistent with the experimental results than that of the model without Knudsen diffusion. It has been demonstrated that higher porosity near the oxygen diffusion layer facilitates the oxygen transport, and the optimal porosity is obtained by balancing mass and charge transport resistances in the ordered catalyst layer. In contrast, higher catalyst loading near membrane improves the cell performance significantly. The highest peak power density of 56.5 mW/cm2 is achieved, when the catalyst loading of the outer and inner layer is 0.15 mg/cm2 and 0.85 mg/cm2, respectively.
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