文献类型：期刊文献

英文题名：Development of Grooves in Gas Diffusion Layers for PEM Fuel Cells Considering Mechanisms of Oxygen Transport and Water Drainage

作者：Wang, Bin[1];Pan, Weitong[1,2];Hu, Zichao[1];Zhang, Guoyu[1];Tang, Longfei[1];Chen, Xueli[1];Wang, Fuchen[1]

机构：[1]East China Univ Sci & Technol, Engn Res Ctr Resource Utilizat Carbon Containing W, Minist Educ, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Div Proc Equipment Sci & Engn, Shanghai 200237, Peoples R China

年份：2024

卷号：38

期号：21

起止页码：21397

外文期刊名：ENERGY & FUELS

收录：;EI(收录号：20244417274068);WOS:【SCI-EXPANDED(收录号:WOS:001340166200001)】；

基金：The research is supported by the China National Postdoctoral Program for Innovative Talents (BX20230121), China Postdoctoral Science Foundation (2023M741163), and Shanghai Post-doctoral Excellence Program (2023741).

语种：英文

外文关键词：Gas permeable membranes

摘要：Ordered structural modifications of the gas diffusion layer (GDL) are crucial for enhancing the performance of proton exchange membrane (PEM) fuel cells. In this work, a three-dimensional, two-phase numerical model of PEM fuel cells with grooves added is constructed. The size, position, and direction of the grooves are examined. The essential relationship between grooves and the cell performance is revealed. The mechanisms of oxygen transport and water drainage are elucidated based on the Sherwood (Sh) number and capillary pressure gradient (del P C), respectively. The findings suggest that under-rib longitudinal grooves offer lower cell performance than under-channel longitudinal grooves due to on-way resistance. Furthermore, the smaller the size of grooves, the higher the cell performance. The underlying reason is that the longitudinal groove demonstrates an increased Shaverage and an enhanced del P C,average, while the transverse groove exhibits a reduced Shaverage and a progressively smooth del P C,local, respectively. On this basis, a comparison between longitudinal and transverse grooves is performed. The current density is enhanced by 0.89% and 1.10%, respectively. Longitudinal grooves are recommended in industrial practice owing to the more favorable del P C,average and relative ease of fabrication. Finally, the superior effects of the longitudinal groove on the cell performance are explored via applications in GDLs with various properties. Taking the drainage capability into account, the longitudinal groove is more suitable for addition in GDLs with a lower porosity.