미세 기공층을 포함한 PEMFC의 상대 습도 변화 환경에서의 유동 분배 및 성능 분석

Abstract

This study analyzes and compares the performance of a micro porous layer (MPL) applied in the gas diffusion layer (GDL) of polymer electrolyte membrane fuel cells under various relative humidity conditions. To analyze the impact of relative humidity, other operating conditions were controlled, and the humidity was set to 50%, 60%, 70%, 80%, 90%, and 100%. This study numerically simulates hydrophobic characteristics and capillary pressure, confirming that the integration of a MPL results in higher water removal characteristic than when only a GDL is present. Under high relative humidity of 100%, there was a 4.89% performance improvement with the MPL; however, under low relative humidity of 50%, the insufficient hydration within the cell led to a 3.93% performance decrease.