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本文通过采用单电池在高电流密度(1200 mA·cm~(-2))下进行100 h的稳态测试,研究了PEMFC水淹过程的碳腐蚀行为及其耐久性。实验前后均进行了性能测试,实验前后对电池阴极进行了循环伏安(CV)分析,实验结束后制备了膜电极的三个区域的样本进行了SEM分析。结果发现:电池性能基本无变化,高电流密度下工作稳定,但是阴极催化剂活性表面积有一定减小,而且阴极催化层特别是流道出口区域有轻微衰减,阳极出口区域催化层厚度有略微的减小,实验结果证明了阴极催化层水淹过程中的碳腐蚀行为。
In this paper, a steady state test of 100 h at high current density (1200 mA · cm ~ (-2)) was carried out to study the carbon corrosion behavior and durability of PEMFC during flooding. Performance tests were performed before and after the experiment. Cyclic voltammetry (CV) analysis was performed on the cathode of the battery before and after the experiment. SEM analysis was performed on the samples prepared from the three regions of the membrane electrode after the experiment. The results show that the performance of the battery is basically unchanged and the operation is stable under the high current density. However, the active surface area of the cathode catalyst decreases to some extent, and the cathode catalyst layer has a slight attenuation at the outlet of the flow channel and the catalyst layer thickness at the anode outlet area decreases slightly Small, the experimental results demonstrate the carbon corrosion behavior of the cathode catalyst layer during flooding.