Solvothermal synthesis of ruthenium doped MnV₂O₇@g-C₃N₄nanocomposite for oxygen evolution reaction and high-performance asymmetric supercapacitors

An increased focus on the supercapacitor has been driven by its improved electrochemical properties, which include a longer cycle life, higher specific capacitance, and better specific power. When comparing a battery to a standard capacitor, the supercapacitor fills the power and energy gap. The supercapacitor has been suggested as a potential energy storage option for future high-power applications. In this research solvent-based synthesis of Ru-MnV2O7@g-C3N4 nanoparticles was followed and these nanoparticles were characterized through X-ray diffraction (XRD), UV-visible spectroscopy, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and energy-dispersive X-ray spectroscopy (EDX). According to the X-ray diffraction (XRD) results the synthesized g-C3N4 and Ru-MnV2O7@g-C3N4 nanoparticles formed a monoclinic phase. By using galvanostatic charge-discharge (GCD), electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV), the supercapacitive characteristics of these nanoparticles were examined. At a current density of 2.5 A/g, the Ru-MnV2O7@g-C3N4//AC nanoparticles achieved a specific capacitance of 785.71 F/g. The asymmetric supercapacitor made of Ru-MnV2O7@g-C3N4//AC shows an impressive 96.1 % capacitance retention after 5000th cycles. In an alkaline environment, Ru-MnV2O7@g-C3N4//AC has a power density of 252 W/kg and an energy density of 13.9 Wh/kg.