期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 625, 期 -, 页码 839-849出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2022.06.094
关键词
Zinc air batteries; Bifunctional oxygen electrocatalysis; Oxygen vacancies; Ceria; Prussian blue analogue
资金
- National Natural Science Foundation of China [22075256, 21975229]
- Central Government Funds for Guiding Local Scientific and Technological Development [2021Szvup160]
This study proposes a novel air electrode using oxygen vacancies-rich CeO2 decorated CoSe2 nanocubes as a catalyst to drive oxygen evolution and reduction reactions in rechargeable Zn-air batteries. The CeO2 coupled CoSe2 nanocubes catalyst exhibits enhanced bifunctional activity, and the assembled Zn-air battery using this electrode shows high power density and long-life stability.
The coupling of oxygen evolution and reduction reactions (OER and ORR) plays a key role in rechargeable Zn-air batteries (ZABs). However, both OER and ORR still suffer from sluggish kinetics, even when using the mainstream precious metal-based catalysts. Herein, oxygen vacancies-rich CeO2 decorated CoSe2 nanocubes are proposed as a novel air electrode to drive OER and ORR for ZABs. The resultant CeO2 coupled CoSe2 nanocubes (CeO2@CoSe2-NCs) catalyst exhibits a significantly enhanced bifunctional activity relative to the pristine CoSe2-NCs and the pristine CeO2. Moreover, an assembled ZABs using this CeO2@CoSe2-NCs electrode delivers a high output power density of 153 mW cm(-2) and a long-life stability over 400 cycles, superior to the benchmark Pt/C-IrO2 electrode. Theoretical calculations reveal that the electronic interaction and oxygen vacancies in CeO2@CoSe2-NCs contribute to efficient oxygen electrocatalysis. This protocol provides a promising approach of constructing oxygen vacancies in hybrid catalysts for energy conversion and storage devices. (C) 2022 Elsevier Inc. All rights reserved.
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