Improving the supercapacitance performance of V₂O₅ interconnected Al₂O₃ composite electrode for energy storage application

Designing and synthesizing transition metal oxide complex nanostructures involved high-capacity electrodes for energy storage applications. In this research work, we have systematically synthesized the V₂O₅/Al₂O₃ composite electrode which evaluated the charge storage activities in an aqueous system to confirm the supercapacitor properties. Further, the obtained composite electrode was estimated by various physico-chemical techniques. The XRD pattern, FE-SEM, TEM images, and BET analysis confirmed the orthorhombic crystalline structure of V₂O₅/Al₂O₃ as mixed crystalline in phase and good formation of the composite electrode with remarkable porous properties. The charge storage activities of this composite electrode were evaluated via a three-electrode system in 1 M KOH electrolyte solution. As an output result, the V₂O₅/Al₂O₃ composite electrode achieved 746.6 F/g at the current density value of 1 A/g. Interestingly, the electrode attained 87.4% stability retention in 3000 cycles. These acceptable electrochemical performances are ascribed to the synergistic effect of metal oxides, which is the coexistence of various electronic states of this V₂O₅/Al₂O₃ composite.