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Three-dimensional porous V2O5 hierarchical spheres as a battery-typed electrode for hybrid supercapacitor with excellent charge storage performance

Abstract

Three-dimensional porous V2O5 hierarchical spheres composed of stacked platelets were fabricated by a facile, low-cost and template-free method. The synthetic route involved a precipitation of precursor microspheres in aqueous solution at room temperature and subsequent calcination. Various techniques including XRD, FE-SEM, TEM, EDS, IR, Raman and nitrogen adsorption-desorption isotherms were used to reveal the composition, morphology and structure of the as-obtained porous V2O5 hierarchical spheres. BET specific surface area of V2O5 hierarchical spheres measured 14 m2·g-1 and their average pore size reached 18.2 nm, and a majority of pores in hierarchical structures were mesoporous. Electrochemical properties of the as-obtained three-dimensional porous V2O5 hierarchical spheres as a battery-typed electrode were investigated by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS). The hierarchical spheres displayed excellent capacity and rate capability and showed an excellent capacity up to 473 C·g−1 at 0.2 A·g−1 owing to their high ion transfer speed transpired between electrolytes and active electrode materials. A flexible hybrid supercapacitor (HSC) device was fabricated using the as-obtained three-dimensional porous V2O5 hierarchical spheres as cathode and activated carbon as anode and delivered an excellent capacitance of 0.26 F cm−2 at 10 mV s−1. The good electrochemical performance of the porous V2O5 hierarchical spheres indicates their high potential as a battery-typed electrode material for HSC device.

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Publication details

The article was received on 11 Aug 2017, accepted on 02 Oct 2017 and first published on 02 Oct 2017


Article type: Paper
DOI: 10.1039/C7DT02986A
Citation: Dalton Trans., 2017, Accepted Manuscript
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    Three-dimensional porous V2O5 hierarchical spheres as a battery-typed electrode for hybrid supercapacitor with excellent charge storage performance

    Y. Zhang, X. Jing, Q. Wang, J. Zheng, H. Jiang and C. Meng, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT02986A

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