发表刊物：Electrochemistry Communications
关键字：Oxygen reduction reaction, Model catalysts, Fe/N/C, Encapsulated catalysts, FePc, Graphene
摘要：Carbon atomic layers with encapsulated transition metal nanoparticles exhibit high catalytic activity for the oxygen reduction reaction (ORR), and good tolerance for poisoning species and acid leaching. However, the active sites and catalytic mechanism are not yet clear, mainly due to the highly heterogeneous structure of encapsulated types of catalysts. In this study, we developed a new model catalyst to mimic encapsulated types of catalysts by covering the well-defined active sites of iron phthalocyanine (FePc) with a monolayer of graphene. It was found that the FePc can activate the surface carbon layer to catalyze the ORR. Unlike exposed FePc on graphene, the embedded catalyst is insensitive to poisoning by SCN− ions. The designed model catalyst demonstrates that molecular type active sites, as well as metal nanoparticles, can form encapsulated catalysts for ORR. The simple and well-defined structure of this model catalyst is helpful for investigating the active sites and the catalytic mechanism at the atomic scale.
论文类型：期刊论文
学科门类：理学
一级学科：化学
文献类型：J
卷号：112
页面范围：106670
是否译文：否
发表时间：2020-05-01
收录刊物：SCI
DOI码：10.1016/j.elecom.2020.106670