Investigation of MEA degradation in PEM fuel cell by on/off cyclic operation under different humid conditions
Investigation of MEA degradation in PEM fuel cell by on/off cyclic operation under different humid conditions
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DOI：
10.1016/j.ijhydene.2010.02.053
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发表时间：
2011
影响因子：
7.2
通讯作者：
Dongho Seo;Jung-Hyun Lee;Sangsun Park;Junki Rhee;S. Choi;Y. Shul
中科院分区：
文献类型：
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作者：
Dongho Seo;Jung-Hyun Lee;Sangsun Park;Junki Rhee;S. Choi;Y. Shul
通过开启/关闭循环操作，研究了不同湿度条件和MEA降解对PEM燃料电池耐久性的影响。在相对湿度(RH)分别为1000、80、50、30和10%时，由电池电压损失10%的循环确定的最大循环次数分别为1980、1650、1100、520和320个循环。在相对湿度为100和80%的高湿条件下，观察到欧姆电阻的增大。另一方面，在相对湿度为50%、30%和10%的低湿条件下，电荷转移阻力增大。在RH50和30%的条件下，通断循环后的电化学表面积损失分别为21%和7%。阳极和阴极层的电极厚度均减小，表明在通断循环过程中发生了碳腐蚀。在阴极层，用X射线衍射仪和透射电子显微镜检测到铂颗粒在聚合物电解液中的生长和迁移。
The durability of PEM fuel cells as a function of different humid conditions and MEA degradation were investigated by on/off cyclic operation. The maximum numbers of cycles determined by cycle at 10% of cell voltage loss were 1980, 1650, 1100, 520, and 320 cycles at relative humidity (RH) of 1000, 80, 50, 30, and 10%, respectively. The increases of ohmic resistance were observed at the high humid conditions of RH 100 and 80%. On the other hand, the charge transfer resistance increased at low humid conditions of RH 50, 30, and 10%. The losses of electrochemical surface area were obtained about 21% and 7% under RH 50 and 30% after the on/off cyclic operations, respectively. The thickness of electrode was reduced in the both anode and cathode layer, indicating that carbon corrosion occurred during on/off cycling. At cathode layer, the growth and migration platinum particles into polymer electrolyte were detected by XRD and TEM analyses.