<p>In this study, cobalt vanadate (Co₃V₂O₈) electrodes with different molar ratios (1:1, 1:2, 1:3, 2:1, and 3:1) were successfully synthesized on nickel foam using a two-step hydrothermal method and subsequently modified with polyaniline (PANI) via in situ oxidative polymerization to enhance electrochemical performance. Structural and morphological characterizations confirmed the successful formation of crystalline Co₃V₂O₈ and the uniform deposition of a conductive PANI layer, resulting in an interconnected electrode architecture. Among the investigated compositions, the 2:1 molar ratio exhibited the highest areal capacitance of 2.20&#xa0;F cm⁻² at a current density of 1&#xa0;mA&#xa0;cm⁻². Following PANI incorporation, the discharge time increased nearly fivefold, and the areal capacitance increased significantly to 12.77&#xa0;F cm⁻² at 1&#xa0;mA&#xa0;cm⁻², demonstrating a strong synergistic effect between the cobalt vanadate framework and the conductive polymer network. Furthermore, the composite electrode maintained an areal capacitance of 0.26&#xa0;F cm⁻² even at a high current density of 100&#xa0;mA&#xa0;cm⁻², indicating a good rate capability. The optimized Co₃V₂O₈/PANI electrode delivered a maximum energy density of 0.11&#xa0;mWh cm⁻² at a power density of 0.95&#xa0;mW cm⁻² and retained 87.45% of its initial capacitance after 10,000 charge-discharge cycles, demonstrating excellent cycling stability. The enhanced electrochemical performance is attributed to the combined pseudocapacitive contribution of Co₃V₂O₈ and the improved electrical conductivity and ion transport pathways provided by the PANI coating. These findings highlight the effectiveness of compositional optimization and conductive polymer integration in the development of high-performance supercapacitor electrodes.</p>