Synthesis of Ni3V2O8-rGO composite nanostructure for high-performance hybrid supercapacitors via hydrothermal method

Abstract

To address global energy demand, major efforts have been made to develop cutting-edge electrode materials for electrochemical energy storage (EES) devices. The present article discusses the hydrothermal synthesis of bare nickel vanadate and a nickel vanadate/reduced graphene oxide (Ni 3 V 2 O 8 -rGO) composite for supercapacitor applications. The physicochemical properties of pure Ni 3 V 2 O 8 (NVO) and the Ni 3 V 2 O 8 -rGO (NVO-rGO) composite were investigated using a variety of characterization tools. The electrochemical traits of the NVO-rGO composite outperform bare NVO due to the synergistic effect. At a current density of 1 mAcm - 2 , the NVO and NVO-rGO nanostructures exhibit excellent specific capacitances of 85 Fg - 1 and 108 Fg - 1 , respectively. These nanostructures also have energy densities of about 3.82 and 5.02 WhKg - 1 , with power densities of 141.75 and 151.57 WKg - 1 for NVO and NVO-rGO composite, respectively. Electrochemical impedance spectroscopy (EIS) studies revealed a charge resistance of 2.05 Omega . The transfer coefficient and standard rate constant indicate that the charge storage mechanism is based on a quasi-reversible redox process. The present investigation demonstrates that the NVO-rGO composite has exceptional electrochemical performance. The outstanding electrochemical performance of both NVO and NVO-rGO underlines their potential as novel and promising materials for supercapacitor applications, implying significant feasibility for large-scale utilization.