Abstract
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/Co3O4 nanocomposite showed high specific surface area (BET) of similar to 880 m(2) g(-1) with BJH pore size and volume of similar to 21 nm, 0.81945 cm(3) g(-1) respectively. The electrochemical performance through cyclic voltammetry (CV) in 3-electrode systems exhibited an improved specific capacitance of 1782 F g(-1) at 5 mV s(-1) in 6 M KOH electrolyte. Additionally, galvanostatic charge-discharge (GCD) analysis showed an improved capacitive performance with a specific capacitance of 1867 F g(-1) at 1 A g(-1) current density. The energy density was calculated 36.9 Wh kg(-1) at the power density of 480 W kg(-1). The capacitance retention graph demonstrates 96% stability through 500 GCD cycles. (C) 2020 The Author(s). Published by Elsevier B.V. on behalf of King Saud University.