Fabrication of Vanadium Oxide@Polypyyrole (V2O5@PPy) Core-Shell Nanofiber Electrode for Supercapacitor

Yue Liang1

Zhen Wei2

Xinyu Zhang1,Email

Ruigang Wang2,Email

1Department of Chemical Engineering, Auburn University, Auburn, AL 36849, USA
2Department of Metallurgical and Materials Engineering, The University of Alabama, Tuscaloosa, AL 35487, USA

 

Abstract

To address the dissolution problem and further enhance the cycling stability and capacitive performance of V2O5, V2O5@polypyrrole (V2O5@PPy) core-shell nanofiber electrode was synthesized by combining a low-cost, easily processing, and eco-friendly sol-gel with in situ polymerization method in this work. V2O5@PPy showed a high specific capacitance of 307 F/g and good cycling life (82 % capacity retention up to 1000 cycles). This benefited from the high conductivity PPy coating layer that facilitated charge transfer and protected the dissolution of V2O5 in the aqueous solution. The synergistic effect between the V2O5 and PPy and the individual role of each component in the electrochemical process were studied to further explore the growth mechanism and provide the rational design electrode material fundamental in the future. Also, the two-electrode symmetric V2O5/PPy device exhibited a maximum energy density of 37 Wh/Kg when the power density was 161 W/kg. 

Fabrication of Vanadium Oxide@Polypyyrole (V2O5@PPy) Core-Shell Nanofiber Electrode for Supercapacitor