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Controlled synthesis of 3D porous VO2(B) hierarchical spheres with various interiors for energy storage

Abstract

A strategy for the synthesis of three-dimensional (3D) porous VO2(B) hierarchical spheres with various interiors (solid spheres and hollow spheres) is developed by a template-free method. 3D VO2(B) solid spheres are synthesized by a precipitation of precursor spheres at room temperature and subsequent calcination; while 3D VO2(B) hollow spheres are prepared by the hydrothermal treatment with the precursor spheres and subsequent calcination. BET specific surface area of VO2(B) solid spheres and hollow spheres measures 18 and 29 m2·g−1, and their porosity vary mesoporous to macroporous with hierarchical structures. Electrochemical properties of 3D porous VO2(B) hierarchical spheres are studied by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (ESI). As for the electrode materials, the specific capacitance of 3D VO2(B) hollow spheres and solid spheres reach as high as 1175 mF cm−2 (336 F·g−1) and 951 mF cm−2 (272 F·g−1) at 2 mA cm−2, respectively. After 10000 cycles, the capacitance of VO2(B) hollow spheres and solid spheres retains about 68% and 49%, respectively. Furthermore, symmetric supercapacitor (SSC) devices using VO2(B) hollow spheres and VO2(B) solid spheres are assembled and they exhibit good pseudocapacitive properties. VO2(B) hollow spheres SSC device delivers the areal capacitance of 246 mF·cm−2 at 1 mA·cm−2; while VO2(B) solid spheres SSC device delivers the areal capacitance of 122 mF·cm−2 at 1 mA·cm−2. VO2(B) hollow spheres exhibit better electrochemical properties including specific capacitance, areal energy density and cycling stability than that of VO2(B) solid spheres. Findings in this work demonstrate that 3D porous VO2(B) hierarchical spheres with various interiors can improve the electrochemical properties of VO2(B) and be considered as promising candidates for high-performance energy storage materials.

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Publication details

The article was received on 20 Jul 2018, accepted on 10 Sep 2018 and first published on 11 Sep 2018


Article type: Research Article
DOI: 10.1039/C8QI00728D
Citation: Inorg. Chem. Front., 2018, Accepted Manuscript
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    Controlled synthesis of 3D porous VO2(B) hierarchical spheres with various interiors for energy storage

    Y. Zhang, X. Jing, Y. Cheng, T. Hu and M. Changgong, Inorg. Chem. Front., 2018, Accepted Manuscript , DOI: 10.1039/C8QI00728D

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