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Fabrication of vanadium oxide with different valences embedded carbon fibers and their electrochemical performance for supercapacitor

Abstract

Composite materials, VxOy embedded carbon fibers, were fabricated through a facile electrospinning method followed by calcination. The as-prepared composite were characterized by X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Thermogravimetric analysis (TGA). The relevant results showed that V2O3 nanoparticles were uniformed embedded in carbon fibers (V2O3/CFs); the VO2 particles were embedded in carbon fibers with mixed valence of V5+ (VO2-V2O5/CFs); amorphous V2O5 were homogeneous dispersed in carbon fibers (V2O5/CFs). Electrochemical properties of the as-prepared composite as working electrode without addition of binder and conductive in a supercapacitor device were evaluated using cyclic voltammetry (CV), galvanostatic charge/discharge (GV) and electrochemical impedance spectroscopy (EIS). The specific capacitance values of V2O3/CFs, VO2-V2O5/CFs and V2O5/CFs were 557 F g-1, 476 F g-1 and 606 F g-1 at 0.5 A g-1, respectively. Consequently, the samples presented well cyclic stability after 5000 cycles at the current density of 5 A g-1 for V2O3/CFs, VO2-V2O5/CFs and V2O5/CFs, respectively. These results demonstrate that variable valence of vanadium oxide embedded could be obtained through the different calcination process and the electrochemical performance of V2O5/CFs is better than that of V2O3/CFs and VO2-V2O5/CFs when they applied to supercapacitor.

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Publication details

The article was received on 03 May 2017, accepted on 12 Jul 2017 and first published on 12 Jul 2017


Article type: Paper
DOI: 10.1039/C7NJ01482A
Citation: New J. Chem., 2017, Accepted Manuscript
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    Fabrication of vanadium oxide with different valences embedded carbon fibers and their electrochemical performance for supercapacitor

    G. huang, C. Li, X. Sun and J. bai, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ01482A

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