Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 12, Issue 30, Pages 7076-7084Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.1c01776
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Funding
- National Natural Science Foundation of China [51771076, 51901080]
- Guangdong Pearl River Talents Plan [2017GC010218]
- R&D Program in Key Areas of Guangdong Province [2020B0101030005]
- Guangdong Basic and Applied Basic Research Foundation [2019A1515010039]
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In this study, highly oriented VO2 monocrystals grown on a Ti current collector were designed as a research model, showing excellent zinc-ion storage capability. Time-of-flight secondary-ion mass spectrometry was used to visualize the H+ reaction process, revealing the reaction mechanism of H+ in the VO2 cathode.
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.
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