文献类型：期刊文献

英文题名：Modeling Study on Anisotropic Transport Properties of Pemfc Gdls Facilitated by Xct

作者：Liu, Hang[1]; Li, Yang[1]; Huang, Heng[1]; Zhou, Zhifu[2]; Wu, Wei-Tao[3]; Wei, Lei[4]; Lyu, Jizu[5]; Hu, Chengzhi[1]; Li, Yubai[1]; Song, Yongchen[1]

机构：[1] Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian, 116024, China; [2] State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi’an, 710049, China; [3] School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China; [4] Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, 518055, China; [5] School of Mechanical Engineering, Guangdong Ocean University, Zhanjiang, 524088, China

年份：2025

外文期刊名：SSRN

收录：EI(收录号：20250042740)

语种：英文

外文关键词：Gas permeable membranes - Gas supply - Ionomers - Thermal diffusion in gases

外文摘要：The gas diffusion layer (GDL) of proton exchange membrane fuel cells (PEMFCs) is a critical component for the transport of reactants. The efficiency of reactant gas transport remains a major technical challenge in the field today. The anisotropic structure of the GDL gives rise to substantial variations of gas diffusion as well as permeability in different directions. The study employs X-CT technology to obtain the actual GDL’s geometry, aiming to investigate a spatial structure at the microscale and its gas transport characteristics. CFD method is used to simulate and study the gas diffusivity and gas permeability of GDL with four different thicknesses. The numerical simulation results show the diffusivity and permeability in the Through-plane (TP) direction are lower than those in the In-plane (IP) direction. Moreover, the effective diffusion coefficient decreases with increasing thickness, but is also dependent on the solid fibre structure of GDL. Horizontal alignment of the carbon fibers and the disc-shaped adhesive contributes to the anisotropy between the TP and IP directions, resulting in anisotropic gas transport. The purpose of the study is to supply critical references for manufacturing techniques and optimization of gas transport in GDLs. ? 2025, The Authors. All rights reserved.