期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 897, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.163203
关键词
Electrocatalysis; Oxygen Evolution Reaction; Oxygen Reduction Reaction; Zn-air battery; Co6Mo6C2
资金
- National Natural Science Foundation of China [21902189, 21901264]
- Key Scientific Research Projects of Universities in Henan Province [21A150062]
- Young Backbone Teacher of Zhongyuan University of Technology
- Fundamental Research Funds for the Central University [DUT21LK15]
This study presents a facile strategy to synthesize N-doped carbon encapsulated Co-Co6Mo6C2 nano polyhedron using ZIF-67 as a precursor, which exhibits high catalytic activity for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). The introduction of Co6Mo6C2 into Co@NC significantly enhances the OER catalytic activity of the catalyst while maintaining high ORR catalytic activity.
To facilitate the development of rechargeable metal-air batteries, the exploration of high effective bifunctional electrocatalysts is essential. In this work, we report a facile strategy to synthesize N doped carbon (NC) encapsulated Co-Co6Mo6C2 (Co-Co6Mo6C2@NC) nano polyhedron using ZIF-67 as a precursor and investigated its catalytic performance for both oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). The introduction of Co6Mo6C2 into Co@NC can significantly improve the OER catalytic activity of the catalyst, while the high ORR catalytic activity of the catalyst is maintained. Specifically, Co-Co6Mo6C2@NC-5 shows a decent half-wave potential of 0.80 V for ORR, and a very low overpotential of 270 mV at 10 mA cm(-2) for OER, demonstrating its bifunctional activity. The rechargeable Zn-air battery assembled using Co-Co6Mo6C2@NC-5 exhibits a maximum power density of 90.75 mW cm(-2) and a high specific capacity of 768 mA h g(-1), as well as good durability of 50 h without attenuation in performance, highlighting its practical application. (C) 2021 Elsevier B.V. All rights reserved.
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