Integrating conductivity and pseudocapacitance in rGO@V₂O₅ nanocomposites for high capacitance and stable cycling performance

In the realm of energy storage, hybrid nanocomposite materials are promising materials with a wide range of applications. In order to create hybrid nanocomposites with superior electrical and charge storage capabilities, 2D rGO was hybridized onto 1D V2O5 using the hydrothermal method. Using a hydrothermal method, three distinct nanocomposite materials were created: one comprised of rGO@V2O5 33.33 wt% rGO, the second one is rGO@V2O5 50 wt% rGO and third one comprised of rGO@V2O5 66.66 wt% rGO as referred to as (G1V2) (G1V1) and (G2V1) respectively. All synthesised composites were compared with pure V2O5. Different physical and electrochemical techniques, including XRD, Raman, FESEM, EIS spectroscopy, cyclic voltammetry, and galvanostatic charge/discharge, were used to analyse the sample and determine the energy-storing parameters, including specific capacitance (Cs), energy density of the composite electrode material. The role of pseudo active V2O5 in storing high charge was investigated in combination with rGO. Maximum specific capacitance (Cs) of 377.3 Fg-1 at 10 mV/s of scan rate, energy density (E) of 42.4 Whkg-1 for G1V1 electrode was obtained. Compared to the pure material, G1V1 demonstrated superior specific capacitance. Also, Faradaic current and capacitive current contributions to total current were also evaluated for G1V1 composite. Furthermore, capacitance retention was also evaluated for pure, optimized G1V1 electrode and it was found to be 3.5-fold higher than the pure electrode.