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

吉林大学学报(工学版) ›› 2022, Vol. 52 ›› Issue (9): 2055-2062.doi: 10.13229/j.cnki.jdxbgxb20220142

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气体扩散层各向异性传输特性的孔尺度模拟

张恒^1,²(),詹志刚²(),陈奔³,隋邦杰³,潘牧²

^1.先进能源科学与技术广东省实验室佛山分中心（佛山仙湖实验室），广东佛山 528200
^2.武汉理工大学材料复合新技术国家重点实验室，武汉 430070
^3.武汉理工大学汽车工程学院，武汉 430070

收稿日期:2022-02-19 出版日期:2022-09-01 发布日期:2022-09-13
通讯作者: 詹志刚 E-mail:hzhang1027@163.com;zzg-j@163.com
作者简介:张恒（1993-），男，在站博士后. 研究方向：新能源汽车燃料电池的模拟仿真计算. E-mail：hzhang1027@163.com
基金资助:
国家自然科学基金项目(22179103);佛山仙湖实验室开放基金重点项目(XHD2020-002)

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

Heng ZHANG^1,²(),Zhi-gang ZHAN²(),Ben CHEN³,Pang-chieh SUI³,Mu PAN²

^1.Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory，Foshan 528200，China
^2.State Key Laboratory of Advanced Technology for Materials Synthesis and Processing，Wuhan University of Technology，Wuhan 430070，China
^3.School of Automotive Engineering，Wuhan University of Technology，Wuhan 430070，China

Received:2022-02-19 Online:2022-09-01 Published:2022-09-13
Contact: Zhi-gang ZHAN E-mail:hzhang1027@163.com;zzg-j@163.com

摘要/Abstract

摘要：

为研究质子交换膜燃料电池（PEMFC）气体扩散层（GDL）内孔隙率对各向异性传输特性参数的影响，首先，使用数值随机重构的方法对Toray TGP-H气体扩散层进行三维微观结构重构。在重构中考虑到了碳纤维分布的各向异性以及Toray TGP-H气体扩散层内部所有的相，包括孔、碳纤维、黏合剂和聚四氟乙烯。然后，利用孔尺度模型分别研究了孔隙率与有效扩散率、曲度、有效电导率、有效热导率以及液态水渗透率在厚度方向和平面内方向的关系。结果表明：孔隙率对传输特性有显著的影响，并且Toray TGP-H气体扩散层的传输特性在平面方向和厚度方向存在着十分明显的各向异性。

关键词: 质子交换膜燃料电池, 气体扩散层, 传输特性, 各向异性, 孔尺度模型

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

中图分类号:

TM911.4

张恒,詹志刚,陈奔,隋邦杰,潘牧. 气体扩散层各向异性传输特性的孔尺度模拟[J]. 吉林大学学报(工学版), 2022, 52(9): 2055-2062.

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.

图/表 9

图1

图2

图3

表1

边界条件"

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

表1

图4

图5

表2

GDL的各向异性参数与孔隙率的关系"

	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

表2

图6

图7

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气体扩散层各向异性传输特性的孔尺度模拟

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

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