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Hydrothermally encapsulating VO2(A) nanorods into amorphous carbon by the carbonization of glucose for energy storage device

Abstract

During past decades, tremendous attention has been paid to the development of new electrode materials with high capacitance to meet the requirements of electrode materials in supercapacitors. Among various vanadium oxides, recently VO2(A) has received increasing attention as its unique layered structure, phase transformation and applications in Li-ion batteries. However, little study is focused on its electrochemical properties as electrochemical capacitors. Herein, we develop a facile hydrothermal method to prepare VO2(A)@C core-shell structured composites by the carbonization of glucose in the presence of V2O5 nanowires. Electrochemical properties of VO2(A)@C core-shell composites are investigated using as a supercapacitor electrode for the first time and the composites show an excellent pseudocapacitive behavior and display specific capacitance up to 179 F·g−1 at 1 A·g−1. A flexible asymmetric supercapacitor device is fabricated using VO2(A)@C composites and activated carbon and delivers an excellent capacitance of 0.5 F cm−2 at a scan rate of 5 mV s−1. Replacing the aqueous electrolyte with a LiCl/PVA gel electrolyte can efficiently improve the cycling performance to 85% remain after 1600 cycles. The good electrochemical performance of the composites indicates their high potential as an electrode material for supercapacitors.

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Supplementary files

Publication details

The article was received on 13 Oct 2017, accepted on 21 Nov 2017 and first published on 21 Nov 2017


Article type: Paper
DOI: 10.1039/C7DT03853D
Citation: Dalton Trans., 2017, Accepted Manuscript
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    Hydrothermally encapsulating VO2(A) nanorods into amorphous carbon by the carbonization of glucose for energy storage device

    J. Zheng, Y. Zhang, Q. Wang, H. Jiang, Y. Liu, T. Lv and C. Meng, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT03853D

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