<p>A facile solvothermal method was employed to synthesize CoFe₂O₄/reduced graphene oxide (rGO) nanocomposites. The effects of rGO content on the structural, microstructural, and electrochemical properties were investigated using modern characterization methods. Ferric and cobalt hydroxides were coprecipitated onto the rGO sheets, which were then transformed into the spinel CoFe₂O₄ phase. As the amount of rGO increased, the specific surface area increased from 85 to 105 m²/g due to the dispersion of CoFe₂O₄ nanoparticles across the rGO sheets. The CoFe₂O₄-10&#xa0;wt. %&#xa0;rGO (10rGO)&#xa0;powders exhibited the highest specific capacitance of 1820 Fg⁻¹ at a current density of 1 Ag⁻¹, decreasing to 1238 Fg⁻¹ at 20 Ag⁻¹. The 10rGO nanocomposite and activated carbon (AC) were used as positive and negative electrodes, respectively, for assembling an asymmetric capacitor. The 10rGO//AC capacitor demonstrated a high energy density of 25.9 Wh kg⁻¹ at a power density of 1500 W kg⁻¹ and a capacitive retention of 82% over 2000 charge/discharge cycles.</p>