<p>The rising energy demands in recent times highlight the need for the development of stable and effective electrode materials for energy storage systems. Herein, manganese vanadate (MnV₂O₄) was synthesized using a simple hydrothermal method, and an advanced nanocomposite (MnV₂O₄-GO) by the incorporation of GO was developed as a multifunctional electrocatalyst. The several advanced spectroscopic techniques, including XRD, Raman, BET, FE-SEM, EDAX, and HR-TEM, were employed to confirm the successful synthesis of high-purity materials. The electrochemical studies were conducted to evaluate the electrochemical activity of the synthesized materials. Because of its exceptional electrical conductivity and beneficial electrochemical activity, the binary transition metal oxide/graphene nanocomposite has been accepted as a potential electrode material. The composite material decorated on graphite felt was utilized as an electrode with an active area of 132&#xa0;cm² in a vanadium redox flow battery (VRFB). The assembled VRFB cell demonstrated a CE of 84.71% and a discharge capacity of 1201.2 mAh at a current density of 50-12.5&#xa0;mA cm⁻², maintaining the stability for up to 200 cycles. Furthermore, research on supercapacitors is carried out by using the nanocomposite material as the working electrode after being coated onto a Toray carbon sheet (1&#xa0;mg cm⁻² area). The electrode exhibited a specific capacitance of 718.6&#xa0;F g⁻¹ at 1&#xa0;A g⁻¹ in charge-discharge studies, and it demonstrated excellent cycling stability with a capacitance retention of 96.66% over 3500 cycles. Additionally, MVG//MV//KOH ASD achieves ED and PD values of 46.66 Wh kg⁻¹ and 399.94 Wkg⁻¹, respectively with 95.28% capacitance retention after 5000 cycles. These studies emphasize the material’s outstanding performance across different energy storage applications.</p> Graphical abstract <p></p>