材料科学
四边形的
扩散
燃料电池
气体扩散
工程物理
核工程
化学工程
工程类
结构工程
物理
热力学
有限元法
作者
Pengzhu Lin,Jing Sun,Changxiang He,Maochun Wu,Tianshou Zhao
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2024-03-25
卷期号:: 1710-1716
标识
DOI:10.1021/acsenergylett.4c00417
摘要
Water flooding remains a critical challenge that hinders the operation of fuel cells at high current and power densities. Here, we develop a novel gas diffusion layer (GDL) featuring quadrilaterally patterned perforations to boost the water drainage capability in proton exchange membrane fuel cells. When the perforations are vertically arranged to flow channels, the fuel cell can achieve a peak power density of 1.43 W cm–2 and a current density of as high as 5400 mA cm–2, far outperforming those with commercial GDLs with and without a microporous layer by 28.6% and 58.8%, respectively. Pore-scale simulations reveal that the patterned perforations reduce the breakthrough pressure and facilitate water removal, thus improving oxygen diffusion in the perforated GDLs, while cell-scale simulations show that the vertically arranged perforations to flow channels significantly enhance water removal to the adjacent channels due to the improved in-plane permeability, thereby reducing liquid water saturation and boosting cell performance.
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