Impedance-Based Performance Analysis of Micropatterned Polymer Electrolyte Membrane Fuel Cells
Impedance-Based Performance Analysis of Micropatterned Polymer Electrolyte Membrane Fuel Cells
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基于阻抗的微图案聚合物电解质膜燃料电池性能分析
DOI：
10.1115/1.4053388
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发表时间：
2022
影响因子：
2.5
通讯作者：
Nakao Masayuki
中科院分区：
文献类型：
--
作者：
Tomizawa Morio;Nagato Keisuke;Nagai Kohei;Tanaka Akihisa;Heinzmann Marcel;Weber Andr?;Inoue Gen;Nakao Masayuki
将微图案应用于质子交换膜可以改善聚合物电解质燃料电池的性能，然而，这种改善的机理尚不清楚。用电化学阻抗谱和驰豫时间分布分析比较了图案化膜电极组件(MEA)和平板膜电极组件(MEA)。微图形通过增加反应面积对氧还原反应有积极的影响。然而，与此同时，这种模式对气体扩散产生了负面影响，因为它延长了通过催化层的平均氧传输路径。此外，有图案的MEA更容易受到洪水的影响，但在低湿度条件下的性能优于平坦的MEA。因此，需要对微图案化MEA的组成、几何结构和工作条件进行综合优化，以达到最佳的性能。
Micropatterns applied to proton exchange membranes can improve the performance of polymer electrolyte fuel cells; however, the mechanism underlying this improvement is yet to be clarified. In this study, a patterned membrane electrode assembly (MEA) was compared with a flat one using electrochemical impedance spectroscopy and distribution of relaxation time analysis. The micropattern positively affects the oxygen reduction reaction by increasing the reaction area. However, simultaneously, the pattern negatively affects the gas diffusion because it lengthens the average oxygen transport path through the catalyst layer. In addition, the patterned MEA is more vulnerable to flooding, but performs better than the flat MEA in low-humidity conditions. Therefore, the composition, geometry, and operating conditions of the micropatterned MEA should be comprehensively optimized to achieve optimal performance.