高电流密度下PEMFC水淹过程的碳腐蚀行为及耐久性研究

Study on Carbon Corrosion Behavior and Durability During Water-Flooding of PEMFC Based on High Current Density

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 order to study carbon corrosion behavior and durability during water-flooding of PEMFC,single cell was tested in steady-state under high current density of 1200 mA·cm^（-2） for100 hours in this paper.Polarization curve and cyclic Voltammetry were analyzed before and after the 100 hours high current density test.Three cross-sectionals of the tested membrane electrode assembly（MEA） were prepared and analyzed by Scanning electronic microscopy（SEM）after the test.The results show that the single cell running steadily during the 100 hours high current density operation,the performance of the cell had no decay after the test.While the cyclic voltammetry（CV） shows that the electrochemical surface area（ECSA） of the cathode was reduced,the cross-sectional SEM shows that the thicknesses of both anode and cathode catalyst layers near the outlet were reduced and cathode carbon corrosion was more serious than that in the anode.These observations confirmed a close correlation between the carbon corrosion and water flooding.