期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 56, 期 25, 页码 7121-7125出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201702430
关键词
bifunctional catalysts; cobalt oxide; Co-N-C species; oxygen reactions; oxygen vacancies
资金
- National Basic Research Program of China [2015CB932302]
- Natural Science Foundation of China [U1432133, U1532265, 11621063, 21331005, J1030412]
- Key Research Program of Frontier Sciences [QYZDY4SSW4SLH011]
- Chinese Academy of Science [XDB01020300]
- National Program for Support of Top-Notch Young Professionals
- Fundamental Research Funds for the Central Universities [WK2060190080, WK2060190027]
The electrocatalyzed oxygen reduction and evolution reactions (ORR and OER, respectively) are the core components of many energy conversion systems, including water splitting, fuel cells, and metal-air batteries. Rational design of highly efficient non-noble materials as bifunctional ORR/OER electrocatalysts is of great importance for large-scale practical applications. A new strongly coupled hybrid material is presented, which comprises CoOx nanoparticles rich in oxygen vacancies grown on B,N-decorated graphene (CoOx NPs/BNG) and operates as an efficient bifunctional OER/ORR electrocatalyst. Advanced spectroscopic techniques were used to confirm formation of abundant oxygen vacancies and strong Co-N-C bridging bonds within the CoOx NPs/BNG hybrid. Surprisingly, the CoOx NPs/BNG hybrid electrocatalyst is highly efficient for the OER with a low overpotential and Tafel slope, and is active in the ORR with a positive half-wave potential and high limiting current density in alkaline medium.
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