<p>The supercapacitor performance enhancement of vanadium oxide (V₂O₅) nanostructures through the incorporation of CuO and reduced graphene oxide (rGO), as the redox-active component and conductive additives, respectively, was reported in this work. The CuO incorporated V₂O₅ (CuO/V₂O₅) nanocomposites (NCs) and rGO-supported CuO/V₂O₅ (CuO/V₂O₅/rGO) NCs were successfully synthesized using an ultrasonication-assisted method. Their structural, morphological, and vibrational properties were systematically investigated using various characterization techniques. For electrochemical evaluation, working electrodes and asymmetric supercapacitors (ASCs) were fabricated using the prepared CuO/V₂O₅ and CuO/V₂O₅/rGO NCs via the Doctor Blade technique and analyzed in a 1&#xa0;M KOH electrolyte. The CuO/V₂O₅ and CuO/V₂O₅/rGO electrodes delivered high specific capacitance values of 740 and 1734 F g⁻¹ at 5&#xa0;mV&#xa0;s⁻¹, and 567 and 1440 F g⁻¹ at 0.5 A g⁻¹, respectively. In terms of device performance, the assembled ASCs based on CuO/V₂O₅ and CuO/V₂O₅/rGO NCs exhibited the outstanding energy densities of 3.8 and 9.93 Wh kg⁻¹ and power densities of 500 and 650 W kg⁻¹, respectively. Furthermore, the CuO/V₂O₅/rGO ASC demonstrated superior cycling stability with 88.31% of its initial capacitance after 5000 galvanostatic charge discharge (GCD) cycles, compared to CuO/V₂O₅ ASC (78.43%). The performance enrichment was ascribed to the synergistic redox interaction between CuO and V₂O₅, along with the improved electrical conductivity and charge transport provided by rGO nanosheets. This study demonstrated that the incorporation of secondary metal oxides and carbonaceous materials into vanadium oxide based electrode systems was an effective strategy for developing high-performance supercapacitors.</p>