2120 低加湿運転PEFC内水分輸送が流路方向発電性能分布に及ぼす影響(J17-3 燃料電池(3) 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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For implementation of higher performance of Polymer Electrolyte Membrane Fuel Cells (PEMFCs) under low humidity condition, water management is essential to keep membrane hydration. To establish water management, it is strongly necessary to understand the water transport in PEMFCs. In this study, the effect of the micro porous layer (MPL) and counter-flow mode under low humidity condition on water transport was examined. Tunable Diode Laser Absorption Spectroscopy (TDLAS) measurement system, which can measure water vapor concentration in the PEMFCs channels, was used in order to investigate water transport between the cathode and the anode side. The experimental results showed that the MPL enhances transport of generated water from the cathode side catalyst layer to the anode side channel through the membrane, and it results in improvement of membrane hydration. The results also showed that improvement of performance at the gas inlet region is caused by counter-flow mode.
2008-08-02