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Issue 45, 2017
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V2O5 embedded in vertically aligned carbon nanotube arrays as free-standing electrodes for flexible supercapacitors

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Abstract

Free-standing, three-dimensional (3D) V2O5 nanobelts coated with poly(3,4-ethylenedioxythiophene) (PEDOT) on vertically aligned CNTs (VA-CNTs)/graphene foam (GF) (PEDOT–V2O5–VA-CNTs/GF) are constructed for flexible energy storage devices. The well-aligned structure of VA-CNTs and light-weight, highly conductive GF lead to highly efficient ionic and electronic transport channels, which are of scientific and practical significance for energy storage/conversion applications. PEDOT–V2O5–VA-CNTs/GF delivers a specific capacitance of 1016 F g−1 at a current density of 1 A g−1 when tested in an aqueous electrolyte. All-solid-state asymmetric supercapacitor devices have been fabricated to demonstrate its flexibility in charging and discharging. Polypyrrole (PPy)/VA-CNTs/GF was used as the negative electrode, PEDOT–V2O5–VA-CNTs/GF as the positive electrode, and PVA/LiNO3 as the solid electrolyte. The solid-state flexible supercapacitors exhibit a high specific capacitance of 48.83 F g−1 at 1 A g−1 and an energy density of 17.34 W h kg−1 at a power density of 0.71 kW kg−1 with good cycle stability as well. This work highlights the advantages of the VA-CNTs/GF substrate in the hybrid electrode with V2O5 embedded among the VA-CNT interstitials for high-performance flexible energy storage devices.

Graphical abstract: V2O5 embedded in vertically aligned carbon nanotube arrays as free-standing electrodes for flexible supercapacitors

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Publication details

The article was received on 01 Sep 2017, accepted on 21 Oct 2017 and first published on 23 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA07727K
Citation: J. Mater. Chem. A, 2017,5, 23727-23736
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    V2O5 embedded in vertically aligned carbon nanotube arrays as free-standing electrodes for flexible supercapacitors

    H. Jiang, X. Cai, Y. Qian, C. Zhang, L. Zhou, W. Liu, B. Li, L. Lai and W. Huang, J. Mater. Chem. A, 2017, 5, 23727
    DOI: 10.1039/C7TA07727K

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