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Rationally designed spider web-like trivanadium heptaoxide nanowires on carbon cloth as a new class of pseudocapacitive electrode for symmetric supercapacitors with high energy density and ultra-long cyclic stability

Abstract

Designed construction of one-dimensional (1D) nanostructures on flexible electrodes without use of polymer binders/conductive additives showed promising prospect to engineer the improved electrochemical properties in supercapacitors. Here, a facile in-situ hydrothermal technique was adopted for the growth of trivanadium heptaoxide nanowires on carbon fiber cloth (V3O7/CFC). The resultant V3O7 sample displayed a self-accumulated growth of nanowires on CFC after 48 h with a spider web-like morphology. The specially designed binder-free V3O7/CFC was used to fabricate symmetric supercapacitor in aqueous 1 M Na2SO4 electrolyte, which showed excellent electrochemical performance. Specifically, in half cell configuration, the device exhibited a maximum specific capacitance (Csp) of 198 F g-1 at 1 A g-1 and in full cell configuration, it showed a Csp of 151 F g-1 under the same current density with ultra-high cycling stability of ~97% (after 100,000 cycles). In addition, the performance of symmetric device in 1 M 1-ethyl-3-methylimidazolium trifluoromethanesulfonate electrolyte was studied and it showed a wide potential window of 2 V with a maximum Csp of 178 F g-1. Furthermore, the device exhibited high energy and power densities of 24.7 Wh kg-1 (48.5 mWh cm-2) and 5.13 kW kg-1 (10.05 W cm-2), representing as a viable electrode in ionic liquid electrolyte.

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Publication details

The article was received on 02 Apr 2018, accepted on 15 May 2018 and first published on 16 May 2018


Article type: Paper
DOI: 10.1039/C8TA03011A
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Rationally designed spider web-like trivanadium heptaoxide nanowires on carbon cloth as a new class of pseudocapacitive electrode for symmetric supercapacitors with high energy density and ultra-long cyclic stability

    M. Ramu, C. J. Raj, R. Murugesan, B. C. Kim, N. Goli, W. Lee and K. Yu, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA03011A

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