Effect of Manganese and Zinc co-dopants on electrochemical properties of vanadium oxide (V2O5) based electrode: application for supercapacitor

Abstract

Vanadium oxides have been investigated for their potential use in electrochemical supercapacitors due to their variable oxidation states yielding surface redox. However, its electrochemical performance is limited by its poor electronic and ionic conductivity. In an attempt to improve the electronic conductance and electrochemical performance of V2O5, (Mn, Zn) co-doped V2O5 is investigated. (Mn, Zn) (2, 2) wt% co-doped V2O5 provides the high specific capacitance, it achieves 23.72F/g at a scan rate of 5mV/s, and it is characterized by very low charge transfer resistance (301mΩ). At 2A/g current density, its power density and energy density are about 2520Wkg− 1, and 4.85Whkg− 1respectively. Because of its good electrochemical performance, (Mn, Zn) (2, 2) wt% co-doped V2O5 has great application prospects in supercapacitors.