2117 ガスクロスオーバの分圧依存性の評価にもとづく電解質膜劣化挙動解析(J17-2 燃料電池(2) 固体高分子形燃料電池,ジョイントセッション,21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

概要

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In this study, the accelerated membrane degradation experiments for polymer electrolyte membrane fuel cells (PEMFCs) under OCV condition were conducted to investigate the membrane degradation behaviors under different supplying gas condition such as hydrogen/oxygen and hydrogen/air. Through the cross-sectional SEM images of the postmortem MEA, it is elucidated that the anode side of the membrane is more deteriorated under H_2 and O_2 condition. In contrast, it is affirmed that the cathode side of the membrane is more deteriorated under hydrogen and air condition. This phenomenon is caused by the discrepancy of oxygen crossover between oxygen and air due to the partial pressure difference. To investigate the crossover effect on the membrane degradation, it is performed to detect the O_2 crossover in the MEA using Direct Gas Mass Spectroscopy. Numerical approach of the membrane degradation rate is performed with the experimental results. The calculated results were well matched to the experimental results.
2008-08-02