电催化剂
材料科学
化学工程
电解质
阴极
质子交换膜燃料电池
聚合物
气体扩散
电化学
电极
复合材料
化学
燃料电池
物理化学
工程类
作者
Kaustubh Khedekar,Pongsarun Satjaritanun,S. Michael Stewart,Jonathan Braaten,Plamen Atanassov,Nobumichi Tamura,Lei Cheng,Christina Johnston,Iryna V. Zenyuk
出处
期刊:Small
[Wiley]
日期:2022-07-24
卷期号:18 (33)
被引量:14
标识
DOI:10.1002/smll.202201750
摘要
Abstract Gas diffusion layers (GDLs) play a crucial role in heat transfer and water management of cathode catalyst layers in polymer electrolyte fuel cells (PEFCs). Thermal and water gradients can accelerate electrocatalyst degradation and therefore the selection of GDLs can have a major influence on PEFC durability. Currently, the role of GDLs in electrocatalyst degradation is poorly studied. In this study, electrocatalyst accelerated stress test studies are performed on membrane electrode assemblies (MEAs) prepared using three most commonly used GDLs. The effect of GDLs on electrocatalyst degradation is evaluated in both nitrogen (non‐reactive) and air (reactive) gas environments at 100% relative humidity. In situ electrochemical characterization and extensive physical characterization is performed to understand the subtle differences in electrocatalyst degradation and correlated to the use of different GDLs. Overall, no difference is observed in the electrocatalyst degradation due to GDLs based on polarization curves at the end of life. But interestingly, MEA with a cracked microporous layer (MPL) in the GDL exhibited a higher electrocatalyst loading loss, which resulted in a lower and more heterogeneous increase in the average electrocatalyst nanoparticle size.
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