Degradation process of fuel cell membrane observed by positron

16th International Conference on Positron Annihilation

Honda, Y.^1 ; Aoyagi, Y.^1 ; Tojo, S.^1 ; Watanabe, G.^2 ; Akiyama, Y.^2 ; Nishijima, S.^2

Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan^1

Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan^2

关键词: Cluster structure;    Degradation process;    Proton conduction;    Solution analysis;    Sulfonic group;    Water radiolysis;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/443/1/012052/pdf
DOI  :  10.1088/1742-6596/443/1/012052

来源: IOP

【 摘 要 】

To investigate degradation process due to radicals in fuel cell membrane by means of positron annihilation spectroscopy, three kinds of radicals, HO, H and O2are produced through water radiolysis. The results show that the cluster structure and proton conductivity was greatly affected by reductive radicals. This is because the oxidative radical is responsible for the dissociation of sulfonic group, whereas the reductive radical breaks down the cluster in the membrane and disrupts proton conduction, which is consistent with solution analysis.