燃料电池气体扩散层的分形模型研究

doi:10.11896/cldb.20120143

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Abstract Gas diffusion layer (GDL) is an important part of fuel cell. It is a porous medium made of carbon paper. Its internal structure shows fractal characteristics in a certain scale. Based on the fractal theory, Fick's law, the surface characteristics of gas diffusion layer and the law of gas-liquid two-phase flow, a mathematical model of gas diffusion coefficient was established. The results show that the effective diffusion coefficient is directly proportional to area fractal dimension and porosity, and inversely proportional to tortuosity fractal dimension and liquid saturation. By comparing the effective diffusion coefficient predicted by the mathematical model with the existing experimental data, it is found that the surface characteristics of the gas diffusion layer, i.e. hydrophilicity and hydrophobicity, have a great influence on the diffusion coefficient. In the case of low liquid saturation, the gas diffusion performance of the hydrophobic-treated diffusion layer is obviously better than that of the hydrophilic diffusion layer. The new mathematical model of gas diffusion coefficient can accurately describe the diffusion law in the gas diffusion layer, which has a certain guiding significance for the design of gas diffusion layer.

Key words： gas diffusion layer fractal theory liquid saturation surface characteristics

Published: 10 July 2022 Online: 2022-07-12

CLC number:

TK121

Fund:Youth Fund of Yunnan Provincial Department of Science and Technology (KKSQ201701008).

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	WANG Changjin
	ZHANG Sai
	XU Jinglei

Cite this article:

WANG Changjin,ZHANG Sai,XU Jinglei. Study on Fractal Model of Fuel Cell Gas Diffusion Layer[J]. Materials Reports, 2022, 36(13): 20120143-6.

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http://www.mater-rep.com/EN/10.11896/cldb.20120143 OR http://www.mater-rep.com/EN/Y2022/V36/I13/20120143

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