This study reports a unique graphitic-C3N4 supported ZnCo2O4 composite, synthesized through a facile hydrothermal method to enhance the electrochemical performance of the electrode. The g-C3N4@ZnCo2O4 hybrid composite based electrode exhibits a significant increase in specific surface area and maximum specific capacity of 157 mAhg-1 at 4 Ag-1. Moreover, g-C3N4@ZnCo2O4 electrode maintained significant capacity retention of 90% up to 2500 cycles. Utilizing this composite in the development of the symmetric device, g-C3N4@ZnCo2O4//g-C3N4@ZnCo2O4 displays a specific capacity of 121 mAhg-1. The device exhibits an energy density of 39 Whkg-1 with an equivalent power density of 1478 Wkg-1. A good cycling stability performance with an energy efficiency of 75% and capacity retention of 71% was observed up to 10,000 cycles. The superior performance of g-C3N4@ZnCo2O4 is attributed to the support of the g-C3N4 which increases the surface area, electroactive sites and provides chemical stability for electrochemical performance. The outstanding performance of this exclusive device symbolizes remarkable progress in the direction of high-performance energy storage applications.