Investigation on the effect of microstructure of proton exchange membrane fuel cell porous layers on liquid water behavior by soft X-ray radiography
Investigation on the effect of microstructure of proton exchange membrane fuel cell porous layers on liquid water behavior by soft X-ray radiography
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DOI：
10.1016/j.jpowsour.2011.05.045
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发表时间：
2011-10
影响因子：
9.2
通讯作者：
T. Sasabe;P. Deevanhxay;S. Tsushima;S. Hirai
中科院分区：
文献类型：
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作者：
T. Sasabe;P. Deevanhxay;S. Tsushima;S. Hirai
为了研究质子交换膜燃料电池（PEMFC）多孔层的微观结构对液态水传输的影响，采用实验室软X射线成像技术对运行中的质子交换膜燃料电池（PEMFC）中液态水的积聚和放电行为进行了可视化研究。利用低能X射线成像技术，可以实现空间分辨率为0.8μm、时间分辨率为2.0sframe-1的PEMFC中液态水行为的可视化，截面成像可以分辨PEMFC的各个组成部分。可视化结果表明，添加MPL防止了液态水在基底层中的积聚，防止了液态水接触催化剂层并在催化剂层上形成液态水膜。此外，还发现液态水在碳纸和碳布GDL中的分布完全不同。碳布GDL中的液态水集中在纤维束的编织处，并被有效地排放到通道中。这些可视化结果表明，质子交换膜燃料电池多孔层的微观结构强烈地影响在质子交换膜燃料电池中的液态水的行为，和详细的孔结构和液态水的网络的理解是必不可少的，以保持氧传输路径的催化剂网站。
In order to investigate the effect of microstructure of PEMFC porous layers on the liquid water transport, liquid water accumulation and discharge behavior in the operating PEMFC was visualized by laboratory-based soft X-ray radiography. The utilization of low energy X-ray made it possible to visualize the liquid water behavior in the PEMFC with the spatial resolution of 0.8μm and the temporal resolution of 2.0sframe−1, and the cross-sectional imaging can resolve the each components of the PEMFC. The visualization results showed that adding the MPL prevents the accumulation of liquid water in the substrate layer from contacting and forming the liquid water film on the catalyst layer. Furthermore, it was found that the liquid water distribution in the carbon paper and the carbon cloth GDL was completely different. The liquid water in the carbon cloth GDL concentrates at the weaves of fiber bundle and was effectively discharged to the channel. These visualization results suggested that the microstructure of the PEMFC porous layers strongly affect the liquid water behavior in the PEMFC, and the detailed understanding of the pore structures and the network of liquid water is essential for keeping the oxygen transport path to the catalyst site.