Estimation of flooding in PEMFC gas diffusion layer by differential pressure measurement
Estimation of flooding in PEMFC gas diffusion layer by differential pressure measurement
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DOI：
10.1016/j.jpowsour.2007.10.019
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发表时间：
2007-07
影响因子：
9.2
通讯作者：
Kohei Ito;Kensuke Ashikaga;Hiromitsu Masuda;Toshihiro Oshima;Y. Kakimoto;K. Sasaki
中科院分区：
文献类型：
--
作者：
Kohei Ito;Kensuke Ashikaga;Hiromitsu Masuda;Toshihiro Oshima;Y. Kakimoto;K. Sasaki
液泛问题，特别是气体扩散层（GDL）的液泛问题，是质子交换膜燃料电池走向实用化的关键问题之一。然而，由于GDL的注水试验数据不足，GDL的水管理优化设计尚未建立。在这项研究中，我们开发了一种方法来估计含水饱和度，即在GDL中的液态水孔隙体积的比率。我们制作了一个简单的叉指型电池，其中供应气体被强制在肋下流动。该结构使得能够通过测量通过池的压差来估计GDL中的液态水比率。我们操作电池并测量压差，并成功地估算了含水饱和度，其随电池操作条件的变化而变化很大。除了这种差压测量之外，我们还通过交流阻抗法测量了聚合物电解质膜中的离子电阻。讨论了含水饱和度对槽电压的影响。
The flooding, especially in gas diffusion layer (GDL), is one of the critical issues to put PEMFC to practical use. However, the experimental data of the flooding in GDL is so insufficient that the optimization design related to the water management for GDL has not established. In this study we developed a method to estimate the water saturation, namely the ratio of liquid water to pore volume in GDL. We fabricated a simple interdigitated cell where the supply gas is enforced to flow under rib. This structure enables to estimate the liquid water ratio in GDL by the measurement of differential pressure through the cell. We operated the cell and measured the differential pressure, and succeeded in estimating the water saturation, which changed largely with changing cell operation condition. In addition to this deferential pressure measurement, we measured the ionic resistance in polymer electrolyte membrane by ac impedance method. We evaluated and discussed the influence of the water saturation on cell voltage.