5 years ago

Atomic-Scale CoOx Species in Metal–Organic Frameworks for Oxygen Evolution Reaction

Atomic-Scale CoOx Species in Metal–Organic Frameworks for Oxygen Evolution Reaction
Dawei Chen, Zhe Hu, Yu-Cheng Huang, Chung-Li Dong, Dafeng Yan, Li Tao, Jeng-lung Chen, Shuangyin Wang, Shulei Chou, Shaohua Shen, Shuo Dou
The activity of electrocatalysts strongly depends on the number of active sites, which can be increased by downsizing electrocatalysts. Single-atom catalysts have attracted special attention due to atomic-scale active sites. However, it is a huge challenge to obtain atomic-scale CoOx catalysts. The Co-based metal–organic frameworks (MOFs) own atomically dispersed Co ions, which motivates to design a possible pathway to partially on-site transform these Co ions to active atomic-scale CoOx species, while reserving the highly porous features of MOFs. In this work, for the first time, the targeted on-site formation of atomic-scale CoOx species is realized in ZIF-67 by O2 plasma. The abundant pores in ZIF-67 provide channels for O2 plasma to activate the Co ions in MOFs to on-site produce atomic-scale CoOx species, which act as the active sites to catalyze the oxygen evolution reaction with an even better activity than RuO2. Through the efficient and mild O2-plasma process, atomic-scale CoOx species in a ZIF-67 matrix are on-site formed, which are in favor of combining with OH* to act as active sites to directly catalyze the oxygen evolution reduction with an even better activity than commercial RuO2.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adfm.201702546

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