Electrochemical investigation of pyrochlore structure Co2V2O7 NPs decorated on rGO sheets for supercapacitor application

Transition-metal oxide (TMO) nanostructures have been widely investigated owing to their promising theoretical electrochemical behavior and high energy enactment. Furthermore, TMO-based nanostructures serve as positive electrode materials in the development of pseudocapacitor. The Co 2 V 2 O 7 nanoparticles (NPs) and Co 2 V 2 O 7 /rGO nanocomposite (NC) electrodes have synthesized by hydrothermal process for enhanced supercapacitor performance. The crystalline structure, purity, and composition of existing elements are confirmed through Powder X–ray diffraction (PXRD), Furrier transform infrared spectroscopy (FTIR), Scanning electron microscope (SEM), and High resolution transmission electron microscope (HR-TEM) analyses. PXRD has revealed a monoclinic crystal structure with an average crystallite size of ∼40 nm, whereas FTIR establish the existence of key functional groups. SEM and HR-TEM have displayed the formed spherical-like morphologies. Elemental compositional and oxidation state of the prepared NC have established by Energy dispersive X-ray spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS) analysis. The pseudocapacitive performance of the Co 2 V 2 O 7 /rGO electrode has evaluated in 1 M LiOH electrolyte solution, achieving a great specific capacitance 767.82 F/g at 1 A/g and 89.4% retaining with result of 5000 cycles. The prepared nanocomposite is used as the in an asymmetric supercapacitor (ACS) device, which delivered a specific capacitance of 97.61 F/g, electrode an energy density of 26.51 Wh/kg, and a power density of 1741.16 W/kg.