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The CrVO4 and reduced graphene oxide (rGO)–CrVO4 composite has been synthesized through solid-state reaction and modified Hummer method and ultrasonication-assisted solid-state reaction method, respectively. The structural, compositional, and morphological features were studied by X-ray diffraction, Raman spectroscopy, scanning electron microscopy, and transmission electron microscopy techniques. The Raman spectroscopy shows the indicative GO, and CrVO4 peaks, respectively, and the coexistence of these peaks in composite material. The photocatalytic activity of rGO–CrVO4 composite evaluated by photocatalytic degradation of methylene blue dye under UV-light irradiation shows improved ability for composite as compared to the parent compound CrVO4. The rate constant evaluated for rGO–CrVO4 is 6.7 × 10–2 min–1. Electrochemical characterization through cyclic voltammetry, galvanostatic charging and discharging, and impedance analysis was carried out. The rGO–CrVO4 composite exhibits a higher specific capacitance, 102.66 F/g @ current density of 0.5 mA/cm2, as compared to the parent CrVO4, 30.87 F/g @ current density of 0.5 mA/cm2. We have also performed extensive density functional theory simulations to qualitatively support our experimental findings by presenting the quantum capacitance and providing the insight from electronic density of states for enhanced capacitance for rGO–CrVO4 nanocomposite. Presence of additional C 2p states from rGO results enhanced the density of states which is responsible for improved supercapacitance performance of rGO–CrVO4 compared to bare CrVO4. These encouraging results illustrate the exciting potential for-high performance applications for GO composites with multifunctionality for multiple applications.

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