双功能
析氧
电催化剂
催化作用
材料科学
电极
氧还原
化学工程
纳米技术
化学
电化学
物理化学
有机化学
工程类
作者
Yonglong Huang,Yuzhou Liu,Yanzhu Deng,Jing Zhang,Beibei He,Jian Sun,Zhihong Yang,Wei Zhou,Ling Zhao
标识
DOI:10.1016/j.jcis.2022.06.094
摘要
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.
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