电解质
化学
催化作用
溶解
电化学
膜
无机化学
离聚物
化学工程
聚合物
电极
有机化学
共聚物
生物化学
工程类
物理化学
作者
Seongmin Yuk,Dong Wook Lee,Kah-Young Song,Sun-Gyu Choi,Donghyun Lee,Gisu Doo,Jonghyun Hyun,Jiyun Kwen,Jun Young Kim,Hee‐Tak Kim
标识
DOI:10.1016/j.jpowsour.2019.227447
摘要
Ce-based materials have been widely used as a radical scavenger to improve the chemical durability of the membrane in polymer electrolyte fuel cells; however, any negative effects from Ce ions on power performance have not been reported as an issue before except for ionomer contamination by Ce3+. Herein, we propose and experimentally demonstrate the detrimental effect of Ce4+ on the Pt/C catalyst. Due to the strong oxidation power of Ce4+, Pt and carbon are subjected to oxidative decomposition under contact with Ce4+. Based on the electrochemical and spectroscopic analyses of the Pt/C stored in Ce3+ and Ce4+ electrolyte, Pt2+ dissolution and carbon corrosion by Ce4+ are verified. As a result, the active surface area and oxygen reduction reaction activity of Pt/C are considerably reduced after storage in the Ce4+ electrolyte. Additionally, at the membrane electrode assembly level, it is demonstrated that the Ce4+ leached out from the CeO2 causes a significant power performance decay along with the loss of the active surface area and an increase in the charge transfer resistance. The newly-found detrimental effect of Ce4+ on the Pt/C catalyst emphasizes the importance of preventing Ce4+ dissolution to improve the membrane durability by Ce-containing radical scavengers.
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