This research focuses on the one-step hydrothermal preparation of NiFe₂O₄@g-CN nanosheets as an electrode material for supercapacitor devices. The study involves the synthesis of NiFe₂O₄@g-CN using a hydrothermal route, followed by various characterization techniques including electrochemical and physical methods. The fabricated NiFe₂O₄@g-CN nanosheets exhibited exceptional specific capacitance of 740 F/g, energy density of 38 Wh/Kg, and power density of 305 W/Kg at 1 A/g. The charge transfer resistance (Rct) value of NFO@g-CN (0.23 Ω) was lower than that of NFO (0.35 Ω) and g-CN (0.27 Ω). Electrochemical stability tests showed that the NiFe₂O₄@g-CN material maintained a stable structure after 5000 cycles. The inclusion of graphitic carbon nitride (g-CN) improved the electrochemical efficiency of NiFe₂O₄ by providing a larger surface area, synergistic interaction, and a higher number of active sites. These findings suggest that the NiFe₂O₄@g-CN nanosheets are promising candidates for use in high-performance supercapacitor devices.This research focuses on the one-step hydrothermal preparation of NiFe₂O₄@g-CN nanosheets as an electrode material for supercapacitor devices. The study involves the synthesis of NiFe₂O₄@g-CN using a hydrothermal route, followed by various characterization techniques including electrochemical and physical methods. The fabricated NiFe₂O₄@g-CN nanosheets exhibited exceptional specific capacitance of 740 F/g, energy density of 38 Wh/Kg, and power density of 305 W/Kg at 1 A/g. The charge transfer resistance (Rct) value of NFO@g-CN (0.23 Ω) was lower than that of NFO (0.35 Ω) and g-CN (0.27 Ω). Electrochemical stability tests showed that the NiFe₂O₄@g-CN material maintained a stable structure after 5000 cycles. The inclusion of graphitic carbon nitride (g-CN) improved the electrochemical efficiency of NiFe₂O₄ by providing a larger surface area, synergistic interaction, and a higher number of active sites. These findings suggest that the NiFe₂O₄@g-CN nanosheets are promising candidates for use in high-performance supercapacitor devices.