High-energy density asymmetric supercapacitor based on electrospun vanadium pentoxide and polyaniline nanofibers in aqueous electrolyte
Mak, Wai Fatt
Mhaisalkar, Subodh Gautam
Date of Issue2012
School of Materials Science and Engineering
Energy Research Institute
Vanadium pentoxide nanofibers (VNF) and polyaniline nanofibers (PANF) nanofibers are synthesized by electrospinning and rapid chemical polymerization routes, respectively. The electrochemical performances of synthesized nanofibers are evaluated in symmetrical (VNF-VNF, PANF-PANF) and asymmetrical (VNF-PANF) configurations in aqueous KCl (3 M) medium by cyclic voltammetry (CV) and galvanostatic measurements. Both VNF and PANF fibers exhibits pseudocapacitive behavior at the electrode/electrolyte interface. The VNF-PANF asymmetrical device is capable of delivering an energy and power densities of 26.7 Wh kg−1 at 0.22 kW kg−1, respectively which is higher than that of symmetrical configuration of VNF-VNF (5.2 Wh kg−1 at 0.22 kW kg−1). In addition, VNF-PANF asymmetrical supercapacitor retained 73% of specific capacitance after 2000 cycles. These results clearly shows that high energy density supercapacitor can be constructed utilizing transitional metal oxides with conducting polymers as electro-active materials in an asymmetrical configuration in aqueous medium.
Journal of the electrochemical society
© 2012 The Electrochemical Society. This paper was published in Journal of The Electrochemical Society and is made available as an electronic reprint (preprint) with permission of The Electrochemical Society. The paper can be found at the following official DOI: [http://dx.doi.org/10.1149/2.040209jes]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.