文献类型：期刊文献

英文题名：Sectionalized Mechanism of Gas-Liquid Transport and Structural Optimization of Grooved Gas Diffusion Layers within PEMFCs

作者：Wang, Yuhao[1,2,3];Pan, Weitong[1,2,3];Tang, Longfei[1,2,3];Ding, Lu[1,2,3];Chen, Xueli[1,2,3];Wang, Fuchen[1,2,3]

机构：[1]East China Univ Sci & Technol, Inst Clean Coal Technol, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Minist Educ, Engn Res Ctr Resource Utilizat Carbon Containing W, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, State Key Lab Coal Liquefact, Gasificat & Utilizat High Efficiency & Low Carbon, Shanghai 200237, Peoples R China

年份：2026

卷号：40

期号：10

起止页码：5276

外文期刊名：ENERGY & FUELS

收录：;EI(收录号：20261120259512);WOS:【SCI-EXPANDED(收录号:WOS:001699672800001)】；

基金：The research is supported by the Shanghai YangFan Program (24YF2709200).

语种：英文

外文关键词：Channel flow - Diffusion in gases - Flow of gases - Gas fuel analysis - Gases - Liquid fuels - Shape optimization

摘要：Grooved gas diffusion layers (GDLs) have garnered significant attention due to their superior gas-liquid transport potential. However, existing studies lack systematic exploration of the mass transfer mechanism and liquid water distribution uniformity. In this work, a three-dimensional two-phase full-scale cell model is constructed to systematically investigate the electrochemical performance and gas-liquid transport characteristics of perpendicularly grooved GDLs. The results demonstrate that perpendicularly grooved GDLs outperform groove-free GDLs, with the optimal groove width of 200 mu m achieving a current density of 1.664 A/cm2 at 0.4 V, representing a 4.9% improvement. The core mechanism lies in the capillary pressure gradient (del P C ) and Sherwood number (Sh) in the GDL region beneath the gas flow channel (GFC), which are significantly increased. del P C and Sh are enhanced by 46.89% and 3.40%, respectively. However, it is notably found that the gas-liquid transport efficiency in the GDL region beneath the rib fails to be enhanced synchronously. The sectionalized transport mechanism leads to a 142.7% increase in liquid water distribution unevenness compared to groove-free GDLs. Therefore, a novel diagonally grooved GDL structure with high reaction uniformity is proposed. By connecting different regions of GDL, the diagonal grooves break the limitation of traditional sectionalized transport, reducing the unevenness of liquid water distribution by 70.6% compared to perpendicularly grooved GDLs. The study also finds the diagonal grooves further reduce the unevenness of liquid water distribution through improving mass transfer between adjacent channels in three-channel cell fuels. This study provides theoretical guidance for the analysis of gas-liquid mass transfer mechanisms and structural optimization of grooved GDLs. It is of great significance for achieving the synergistic optimization of GDL performance and durability.