Huang Yonglong, Liu Yuzhou, Deng Yanzhu, Zhang Jing, He Beibei, Sun Jian, Yang Zhihong, Zhou Wei, Zhao Ling
Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China.
Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China; Shenzhen Research Institute, China University of Geosciences, Shenzhen 518000, China.
J Colloid Interface Sci. 2022 Nov;625:839-849. doi: 10.1016/j.jcis.2022.06.094. Epub 2022 Jun 23.
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 CeO decorated CoSe nanocubes are proposed as a novel air electrode to drive OER and ORR for ZABs. The resultant CeO coupled CoSe nanocubes (CeO@CoSe-NCs) catalyst exhibits a significantly enhanced bifunctional activity relative to the pristine CoSe-NCs and the pristine CeO. Moreover, an assembled ZABs using this CeO@CoSe-NCs electrode delivers a high output power density of 153 mW cm and a long-life stability over 400 cycles, superior to the benchmark Pt/C-IrO electrode. Theoretical calculations reveal that the electronic interaction and oxygen vacancies in CeO@CoSe-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.
析氧反应与还原反应（OER和ORR）的耦合在可充电锌空气电池（ZABs）中起着关键作用。然而，即使使用主流的基于贵金属的催化剂，OER和ORR的动力学仍然迟缓。在此，提出了富含氧空位的CeO修饰的CoSe纳米立方体作为一种新型空气电极，用于驱动ZABs的OER和ORR。所得的CeO耦合CoSe纳米立方体（CeO@CoSe-NCs）催化剂相对于原始CoSe-NCs和原始CeO表现出显著增强的双功能活性。此外，使用这种CeO@CoSe-NCs电极组装的ZABs具有153 mW cm的高输出功率密度和超过400次循环的长寿命稳定性，优于基准Pt/C-IrO电极。理论计算表明，CeO@CoSe-NCs中的电子相互作用和氧空位有助于高效的氧电催化。该方案为在用于能量转换和存储装置的混合催化剂中构建氧空位提供了一种有前景的方法。
