Measurement of liquid water distribution in GDL under cross-flow-inducing parallel flow field using operando synchrotron X-ray radiography

IF 5.4 Q2 CHEMISTRY, PHYSICAL Journal of Power Sources Advances Pub Date : 2023-06-01 DOI:10.1016/j.powera.2023.100119
Takahisa Suzuki , Akihiko Kato , Satoshi Yamaguchi , Yasutaka Nagai , Daisuke Hayashi , Satoru Kato
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Abstract

Baffles in flow field channels for air in a polymer electrolyte fuel cell are known to enhance the performance by inducing convective flow through the gas diffusion layer (GDL) with smaller pressure loss than interdigitated flow fields. This work experimentally correlates performance enhancement with the amount of liquid water in a GDL. A parallel flow field (PFF) that has different inlet and outlet opening sizes is applied to induce cross-flow in the GDL under the rib between adjacent air channels. Operando synchrotron X-ray radiography experiments are conducted to compare the amount of water in the GDL with that for a PFF having the same inlet and outlet sizes. The performance enhancement by application of different opening sizes increases with decreasing relative humidity and increasing air flow rate. A significant performance enhancement is observed when the amount of water in the GDL substrate under the rib becomes almost zero. No performance enhancement is observed under over-humidified conditions, although a decrease in the amount of water in the GDL is still observed, which suggests that the performance becomes insensitive to the difference in the liquid water saturation as the saturation increases.

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横流诱导平行流场下GDL内液态水分布的operando同步辐射x射线测量
已知聚合物电解质燃料电池中用于空气的流场通道中的挡板通过诱导对流通过气体扩散层(GDL)来增强性能,该对流具有比叉指状流场更小的压力损失。这项工作通过实验将性能增强与GDL中液态水的量联系起来。应用具有不同入口和出口开口尺寸的平行流场(PFF),以在相邻空气通道之间的肋下的GDL中诱导交叉流动。进行了操作同步加速器X射线照相实验,以比较GDL中的水量与具有相同入口和出口尺寸的PFF中的水量。通过应用不同开口尺寸的性能增强随着相对湿度的降低和空气流速的增加而增加。当肋下的GDL基板中的水量几乎为零时,观察到显著的性能增强。在过度加湿的条件下没有观察到性能增强,尽管仍然观察到GDL中水量的减少,这表明随着饱和度的增加,性能对液态水饱和度的差异变得不敏感。
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CiteScore
9.10
自引率
0.00%
发文量
18
审稿时长
64 days
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