核壳结构的V10O24·12H2O@ACFC:一种高性能对称超级电容器电极材料

doi:10.11896/cldb.22050088

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Abstract Supercapacitors with their high power density and long cycle life have attracted much attention. In order to engineer an electrode material with low-cost, easy to obtain and high-performance, cheap and easily available carbon fiber cloth is used as the substrate to activate itself by electrochemical etching in this work. And the actived carbon fiber cloth acting as the carrier successfully induces V₂O₅ sol to be converted into gel, and then on its surface obtains a composite material coated with V₁₀O₂₄·12H₂O ultra-thin nanosheets through freeze-drying treatment. Finally, the electrode materials with core-shell structure are prepared under simple and mild conditions. UV-Vis spectroscopy was employed to reveal the process of this adsorption conversion. The essence of electrochemical activation is that oxygen containing functional groups are introduced into the carbon fiber cloth and its adsorption performance is enhanced while showing mesoporous characteristics. SEM and XRD results show that the composite has a core-shell structure with carbon fiber as the ‘core' and V₁₀O₂₄·12H₂O ultra-thin nanosheets as the ‘shell'. Electrochemical measurements indicate that the specific capacity is 488 F/g at 1 A/g. While, the initial specific capacity of 256 F/g at 5 A/g is still being increased continuously at the beginning of the cycles within 4 000, from here until 10 000 cycles, the capacity retention could reach to 100%, showing the ulta-long life span. When the power density is 1 875 W/kg, the energy density of 20.1 Wh/kg can still be output. The excellent electrochemical performance benefits from the structural synergy of the electrode material. It is the core-shell structure that organically combines the electric double-layer capacitance behavior on ACFC-1.0 with the pseudo capacitance behavior on V₁₀O₂₄·12H₂O ultra-thin nanos-heets, which provides a feasible scheme for the design of new high-performance supercapacitors.

Key words： activated carbon fiber cloth adsorption core-shell structure oxygen-containing functional groups V₁₀O₂₄·12H₂O ultra-thin nanosheets supercapacitors

Published: 10 November 2023 Online: 2023-11-10

CLC number:	TB332
	TB321
	TM53

Fund:National Natural Science Foundation Youth Fund of China (51802291), the Key Projects on Scientific Research Plan of Colleges and Universities in Xinjiang Uygur Autonomous Region (XJEDU2016I045), the Innovation Project for Postgraduate Scientific Research of Yili Normal University in 2020 (YSD202017).

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	Articles by authors
	HUANG Xianmin
	LI Ziwei
	ZHANG Xiaoyan
	LIU Hui
	GAO Hongyan
	WANG Hai

Cite this article:

HUANG Xianmin,LI Ziwei,ZHANG Xiaoyan, et al. V₁₀O₂₄·12H₂O@ACFC with Core-shell Structure:a High Performance Symmetric Supercapacitor Electrode Material[J]. Materials Reports, 2023, 37(21): 22050088-8.

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http://www.mater-rep.com/EN/10.11896/cldb.22050088 OR http://www.mater-rep.com/EN/Y2023/V37/I21/22050088

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