Effect of gas diffusion layer degradation on the internal water distribution in PEMFC

PEMFC 기체확산층 열화에 의한 내부 물 분포 변화 연구

This study explores the effect of gas diffusion layer (GDL) degradation on the performance and water management of polymer electrolyte membrane fuel cells (PEMFCs) through in-situ accelerated stress tests involving humidification/dehumidification cycles. Using synchrotron X-ray imaging, the research reveals that GDL degradation increases water retention and alters water transport behavior, leading to flooding and mass transport losses. The aged GDLs show larger pores and reduced hydrophobicity, impairing water drainage and gas transport. This contributes to performance loss, particularly at higher current densities. The findings highlight the importance of enhancing GDL durability to maintain stable PEMFC performance and meet lifespan targets, particularly in automotive applications requiring long-term reliability under fluctuating conditions.