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Enhanced Stability and Narrowed D-Band Gap of Ce-Doped Co3O4 for Rechargeable Aqueous Zn-Air Battery

Authors:	Jinmei Qian Xin Liu Chenglin Zhong Guofu Xu Haijing Li Wanhai Zhou Bo You Fei Wang Daqiang Gao Dongliang Chao

Affiliation:	1. Key Laboratory for Magnetism and Magnetic Materials of MOE, Key Laboratory of Special Function Materials and Structure Design of MOE, Lanzhou University, Lanzhou, 730000 China;2. Laboratory of Advanced Materials, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, and School of Chemistry and Materials, Fudan University, Shanghai, 200433 China;3. College of Chemistry and Chemical Engineering, Linyi University, Linyi, Shandong, 276005 China;4. Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049 China;5. School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074 China

Abstract:	It remains challenging to achieve further breakthroughs in the development of durable bifunctional air cathode electrocatalysts for increasing the cycling life of rechargeable Zn-air battery (RZAB). Herein, d-band gap narrowing strategy is proposed to significantly boost the electrocatalytic activity and stability of spinel Co₃O₄ for both oxygen reduction and evolution reactions. In situ Raman spectroscopy finds that the Ce atom substitution can significantly improve the durability and corrosion resistance of electrocatalysts in harsh alkaline electrolytes. Synchrotron X-ray absorption fine structure reveals that the Co³⁺/Co²⁺ ratio of Co₃O₄ can be tuned with Ce introduction, which is beneficial to optimize the adsorption/desorption of the intermediates over Co_oh³⁺ active sites. Density functional theory calculations further confirm the reduced gap between Co d-band and O p-band centers, increased electrical conductivity, together with the deepened valence band maximum of Co sites in Ce-doped Co₃O₄. Thereby, the optimized RZAB with Ce-Co₃O₄ delivers excellent long-term durability (290 h) and large specific capacity (876.3 $W h k g_{Z n}^{? 1} $Whkg_{Zn}^{{\bm{ - }}1}$$ ), which possesses great prospects in all-solid-state flexible RZAB devices.

Keywords:	aqueous batteries Ce-doped Co 3O 4 d-band center octahedral-site occupation Zn-air batteries

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