卟啉
催化作用
硫黄
共价键
电化学
兴奋剂
金属
氧气
氮气
碳纤维
共价有机骨架
化学
无机化学
氧还原反应
材料科学
光化学
组合化学
作者
Xiaoming Yu,Yunchao Ma,Cuiyan Li,Xinyu Guan,Qianrong Fang,Shilun Qiu
标识
DOI:10.1007/s40242-021-1374-1
摘要
Oxygen reduction reaction(ORR) is a significant reaction for energy conversion systems(such as fuel cells, metal-air batteries, etc.). It is an urgent need to develop cheap, durable and highly-active catalysts for efficient ORR. Hence, we report a metal-free nitrogen and sulfur co-doped porphyrin-based covalent organic framework(COF) as a high-efficiency ORR catalyst[the onset potential(Eo) is 0.79 V and the half-wave potential(E1/2) is 0.70 V]. The double doping of N and S atoms causes uneven charge distribution around carbon atoms, which can act as catalytic active centers, improving ORR activity. Compared with single-atom doping, double atoms doping exhibits a higher activity due to the synergistic effect between different elements. These results demonstrate that reasonable design of stable metal-free COFs with a high electrochemical activity can promote their wide applications.
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