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(조선대학교) (조선대학교)
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대한기계학회 대한기계학회 춘추학술대회 대한기계학회 2022년 학술대회
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    초록·키워드

    Variations in humidity in operating polymer electrolyte membrane fuel cells(PEMFCs) lead to the swelling and shrinkage of membranes which causes the mechanical degradation. Most previous studies have focused on the mechanical damage of the membrane although mass transport was also influenced by the mechanical degradation. In this study, the effect of mechanical degradation in PEMFC on the performance and mass transport loss was investigated. In order to induce the mechanical degradation, accelerated stress test(AST) with periodic wet and dry conditions was employed. The performance was maintained up to AST 2000 cycles. At above 2000 cycles, the performance started to decrease. The maximum power density after AST 5000 cycles was reduced by about 50%. Mass transfer losses after AST were higher than those in original cell. Different with the original PEMFC having no mass transport loss, the mass transport loss after AST 5000 cycles occurred even at low current density.

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