Direct Detection and Visualization of the H+ Reaction Process in a VO2 Cathode for Aqueous Zinc-Ion Batteries

被引:33
作者
Zuo, Shiyong [1 ]
Liu, Jun [1 ]
He, Weixin [1 ]
Osman, Sahar [1 ]
Liu, Zhengbo [1 ]
Xu, Xijun [1 ]
Shen, Jiadong [1 ]
Jiang, Wei [1 ]
Liu, Jiangwen [1 ]
Zeng, Zhiyuan [2 ]
Zhu, Min [1 ]
机构
[1] South China Univ Technol, Sch Mat Sci & Engn, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510641, Peoples R China
[2] City Univ Hong Kong, Dept Mat Sci & Engn, Kowloon, Hong Kong 999077, Peoples R China
基金
中国国家自然科学基金;
关键词
PERFORMANCE; COMPOSITE; V2O5; XPS;
D O I
10.1021/acs.jpclett.1c01776
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Because they are safer and less costly than state-of-the-art Li-ion batteries, aqueous zinc-ion batteries (AZIBs) have been attracting more attention in stationary energy storage and industrial energy storage. However, the electrochemical reaction of H+ in all of the cathode materials of AZIBs has been puzzling until now. Herein, highly oriented VO2 monocrystals grown on a Ti current collector (VO2-Ti) were rationally designed as the research model, and such a well-aligned VO2 cathode also displayed excellent zinc-ion storage capability (e.g., a reversible capacity of 148.4 mAh/g at a current density of 2 A/g). To visualize the H+ reaction process, we used time-of-flight secondary-ion mass spectrometry. With the benefit of such a binder-free and conductor-free electrode design, a clear and intuitive reaction of H+ in a VO2 cathode is obtained, which is quite significant for unraveling the accurate reaction mechanism of VO2 in AZIBs.
引用
收藏
页码:7076 / 7084
页数:9
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