Supercapacitor behavior and characterization of RGO anchored V_2O_5 nanorods

摘要

Reduced graphene oxide (RGO) anchored vanadium pentoxide (V2O5) nanorods have been synthesized by using simple and cost efficacious sol-gel method. The prepared sample was analyzed by different physical and electrochemical techniques such as TG/DTA, XRD, XPS, FTIR, Micro-Raman, FESEM, HRTEM and cyclic voltammetry and galvanostatic charge/discharge. The electrochemical characterization shows that all the curves exhibit quasi-rectangular shape with redox peak, which indicates the pseudocapacitance nature of the V2O5 and RGO/V2O5 electrode materials. V2O5 electrode material exhibits the high specific capacitance (112 F/g) at low scan rate (10 mV/s) due to high surface area. The RGO/V2O5 electrode material exhibits two folds greater specific capacitance values (218.4 F/g at 10 mV/s) than pure V2O5 electrode material. This result clearly indicates the pseudocapacitance nature was enhanced by the RGO nanosheets. The GCD curve also reveals the RGO/V2O5 electrode has good charge/discharge time and superior specific capacitance than bare V2O5 electrode. These excellent electrochemical activities may credit due to RGO nanosheets, which induce large transfer of electrons and also provides high surface sites and short transport path length for the diffusion of electrolyte ions.