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An experimental study of the liquid water saturation level in the cathode gas diffusion layer of a PEM fuel cell

机译：PEM燃料电池阴极气体扩散层中液态水饱和度的实验研究

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摘要

A proton exchange membrane (PEM) fuel cell with a flow field that can be switched between the serpentine and the interdigitated flow modes was used to measure the liquid water saturation level in the gas diffusion layer (GDL) of the cathode and the effect of the liquid water saturation level on the fuel cell performance. Using correlations between the liquid water saturation level and gas relative permeability obtained by neutron imaging, the liquid water saturation level in the GDL under serpentine flow mode was determined by the gas pressure drop across the GDL right after the flow field was switched from the serpentine mode to interdigitated mode. The results showed that the saturation levels in the cathode GDL during the interdigitated mode was much lower than that during the serpentine mode leading to better oxygen gas access to the cathode catalyst layer and consequently better fuel cell performance, especially at high current densities and low oxygen stoichiometric flow rate. In most cases, the fuel cell became unstable when the average liquid water saturation level exceeded 20%.
机译：质子交换膜（PEM）燃料电池的流场可以在蛇形和指间流动模式之间切换，用于测量阴极气体扩散层（GDL）中的液态水饱和度以及液态水饱和度对燃料电池的性能影响很大。利用中子成像获得的液态水饱和度水平与气体相对渗透率之间的相关性，通过将流场从蛇形模式切换后立即通过GDL的气压降来确定蛇形流动模式下GDL中的液态水饱和度水平进入交叉模式。结果表明，在交叉指模式下阴极GDL的饱和度要比在蛇形模式下低得多，这导致氧气更好地进入阴极催化剂层，从而改善了燃料电池的性能，特别是在高电流密度和低氧的情况下化学计量流量。在大多数情况下，当平均液态水饱和度水平超过20％时，燃料电池就会变得不稳定。

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  • 来源
    《Journal of power sources》 |2012年第1期|p.50-56|共7页
  • 作者

    Xuhai Wang; Trung Van Nguyen;

  • 作者单位

    Department of Chemical and Petroleum Engineering, The University of Kansas. Lawrence. KS 66045, USA;

    Department of Chemical and Petroleum Engineering, The University of Kansas. Lawrence. KS 66045, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    PEM fuel cells; liquid saturation levels; relative permeability;

    机译：PEM燃料电池;液体饱和度水平;相对磁导率;

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