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THE NATURE OF FLOODING AND DRYING IN POLYMER ELECTROLYTE FUEL CELLS

机译:高分子电解质燃料电池的充液和干燥性质

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摘要

Two different 50 cm~2 fuel cells operated at high current density (1.3A/cm~2-1.5A/cm~2) were visualized using neutron imaging, and the liquid water content in the flow channels and diffusion media under the lands and channels was calculated and compared. At high current density with fully humidified inlet flow, a direct comparison between flooded and non-flooded conditions was achieved by increasing the fuel cell temperature over a small range, until voltage loss from flooding was alleviated. Results indicate that a surprisingly small mass of liquid water is responsible for a significant voltage loss. The deleterious effects of flooding are therefore more easily explained with a locally segregated flooded pore model, rather than a homogeneously flooded pore and blockage phenomenon. Anode dryout was similarly observed and quantified, and results indicate that an exceedingly small mass of water is responsible for significant voltage loss, which is consistent with expectations. The results presented help to form a more complete vision of the flooding loss and anode dryout phenomena in PEFCs.
机译:使用中子成像技术,可以观察到两个在高电流密度(1.3A / cm〜2-1.5A / cm〜2)下工作的50 cm〜2燃料电池,流道和平台下方的扩散介质中的液态水含量计算并比较渠道。在高电流密度和充分湿润的进口流量的情况下,通过在较小范围内提高燃料电池温度,直至减轻了溢流引起的电压损失,可以直接比较溢流和非溢流条件。结果表明,出乎意料的少量液态水是造成明显电压损失的原因。因此,用局部隔离的淹没孔隙模型而不是均匀淹没的孔隙和堵塞现象更容易解释淹没的有害影响。类似地观察到并量化了阳极变干,结果表明,极少的水量会导致明显的电压损失,这与预期相符。提出的结果有助于对PEFC中的水淹损失和阳极变干现象形成更完整的认识。

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