气体扩散层各向异性传输特性的孔尺度模拟

doi:10.13229/j.cnki.jdxbgxb20220142

Abstract

Abstract:

To study the effect of porosity in the gas diffusion layer （GDL） of a proton exchange membrane fuel cell on the anisotropic transport properties， stochastic numerical method was used to reconstruct the 3-D microstructure of the Toray TGP-H GDL. The anisotropy of carbon fiber distribution and all phases in the gas diffusion layer including pores， carbon fibers， binder， and polytetrafluoroethylene （PTFE） were taken into account in the reconstructed structure. The pore-scale model was employed to obtain the relationship between porosity and effective gas diffusivity， tortuosity， liquid water permeability， effective electrical and thermal conductivity in the in-plane and through-plane. The results show that the porosity has a significant effect on the transport properties， and the transport properties of the Toray TGP-H GDL have obvious anisotropy in the in-plane and through-plane.

Key words: proton exchange membrane fuel cell（PEMFC）, gas diffusion layer, transport properties, anisotropy, pore size model

CLC Number:

TM911.4

Heng ZHANG,Zhi-gang ZHAN,Ben CHEN,Pang-chieh SUI,Mu PAN. Anisotropic transport properties of gas diffusion layer based on pore⁃scale model[J].Journal of Jilin University(Engineering and Technology Edition), 2022, 52(9): 2055-2062.

Figures/Tables 9

Fig.1

Fig.2

Fig.3

Table 1

Boundary conditions"

参数	边界1^［18］	边界2^［18］
$c O 2 /$ 10^-6 mol cm^-3	9	8.9
$? s /$ V	0.69	0.7
$T / K$	349.9	350

Table 1

Fig.4

Fig.5

Table 2

Relationship between the anisotropic transport properties of GDL and porosity"

	厚度方向（TP）		平面内方向（IP）
	方程	R²	方程	R²
D/D_eff	$1.15 ε - 3.18$	0.97	$0.74 ε - 3.02$	0.96
$τ$	$1.15 ε - 2.18$	0.97	$0.74 ε - 2.02$	0.97
K/［W·（m·K）^-1］	423.4 $e - 7.27 ε$	0.96	200 $e - 4.31 ε$	0.97
σ_e/（S·m^-1）	296 342 $e - 7.27 ε$	0.98	139 764 $e - 4.31 ε$	0.98
$κ$ /μm²	0.008 3 $e 8.04 ε$	0.98	0.063 6 $e 6.41 ε$	0.97

Table 2

Fig.6

Fig.7

References 20

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Anisotropic transport properties of gas diffusion layer based on pore⁃scale model

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