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Local Area Water Removal Analysis of a Proton Exchange Membrane Fuel Cell under Gas Purge Conditions

机译:气体吹扫条件下质子交换膜燃料电池的局部除水分析

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摘要

In this study, local area water content distribution under various gas purging conditions are experimentally analyzed for the first time. The local high frequency resistance (HFR) is measured using novel micro sensors. The results reveal that the liquid water removal rate in a membrane electrode assembly (MEA) is non-uniform. In the under-the-channel area, the removal of liquid water is governed by both convective and diffusive flux of the through-plane drying. Thus, almost all of the liquid water is removed within 30 s of purging with gas. However, liquid water that is stored in the under-the-rib area is not easy to remove during 1 min of gas purging. Therefore, the re-hydration of the membrane by internal diffusive flux is faster than that in the under-the-channel area. Consequently, local fuel starvation and membrane degradation can degrade the performance of a fuel cell that is started from cold.
机译:在这项研究中,首次通过实验分析了各种气体吹扫条件下的局部含水量分布。使用新型微型传感器测量局部高频电阻(HFR)。结果表明,膜电极组件(MEA)中的液体除水速率不均匀。在通道下方区域,液态水的去除受平面干燥的对流和扩散通量的控制。因此,几乎所有的液态水在用气体吹扫后的30秒内都被去除了。但是,存储在肋骨下方区域的液态水在吹扫气体1分钟的过程中不容易清除。因此,通过内部扩散通量使膜的再水化比在通道下方区域中的更快。因此,局部燃料不足和膜降解会降低从冷开始的燃料电池的性能。

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