Unveiling the synergistic effect of Co₃O₄/C₃N₅ architecture for the high performance symmetric hybrid supercapacitor

Supercapacitor is the most promising energy storage system due to its excellent cyclic stability, reliability, and high power density. Nevertheless, the thriving performance of supercapacitors in next-generation energy storage systems is impeded by their low energy density, and electrochemical potential window. The hybrid supercapacitor has acquired a potential alternative to the conventional supercapacitor with its commendable electrochemical properties from entwined effects. Herein, Co₃O₄ is grown into the layered C₃N₅ through the in-situ hydrothermal technique; the Co₃O₄/C₃N₅ composite is constructed for the high performance supercapacitor. It widens the voltage window within aqueous and gel-based electrolytes, employing three-electrode and two-electrode setups. The augmented proportion of Co₃O₄ developed between the delaminated carbon nitride enabling impressive cyclic stability and extending their electrochemical potential window. As a result, the assembled Co₃O₄/C₃N₅ composite achieved a maximum specific capacitance of approximately 405 F/g at a current density of 1 A/g. Furthermore, the fabricated symmetric supercapacitor achieved a high energy density of 57.7 Wh/kg and exhibited excellent cyclic stability of 100 % over 5000 cycles. This will epitomize the hybrid supercapacitor, serving as a resurgence to provide promising solutions in the field of energy storage applications.