The search of low cost, highly competent electrode material is the hot research area for various next-gen applications. Herein, cost effective nitrogen doped carbon quantum dots (N-CQDs) anchored in cobalt oxide (Co3O4) nanocomposite was fabricated through a simple hydrothermal method. The fabricated N-CQDs/Co3O4nanocomposite showed high specific surface area (BET) of ~880?m2?g?1with BJH pore size and volume of ~21?nm, 0.81945?cm3?g?1respectively. The electrochemical performance through cyclic voltammetry (CV) in 3-electrode systems exhibited an improved specific capacitance of 1782?F g?1at 5?mV s?1in 6?M KOH electrolyte. Additionally, galvanostatic charge–discharge (GCD) analysis showed an improved capacitive performance with a specific capacitance of 1867??F g?1at 1?A g?1current density. The energy density was calculated 36.9?Wh?kg?1at the power density of 480?W?kg?1.The capacitance retention graph demonstrates 96% stability through 500 GCD cycles.
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