▎ 摘　　要

Herein, 5-amino-substituted 1,10-phenanthroline-functionalized graphene oxide (N-FGO) was complexed with cobalt(II), and synthesized nanocomposite (N-FGO-Co nanocomposite) used in an actual symmetrical supercapacitor. First, the nanocomposite was analyzed by XPS, XRD, FT-IR, SEM, TEM, and BET. After structural characterization, electrochemical tests (CV, GCD, and EIS) in three-electrode systems were performed to investigate the electrochemical behavior of the nanocomposite. N-FGO-Co nanocomposite exhibits quasi-rectangular shape CV diagrams, triangular and symmetrical GCD diagrams, low resistance, and high stability. The results confirmed the ideal electrochemical behavior of this composite as the super capacitor electrode. In three-electrode system, the specific capacitance of 512 and 541 F g(-1) were calculated at current density of 1 A g(-1) and scan rate of 5 mV s(-1), respectively. Then, the nanocomposite was investigated as positive and negative electrodes in a symmetrical supercapacitor. The N-FGO-Co//N-FGO-Co system shows specific capacity of 268 and 266 F g(-1) at current density of 0.5 A g(-1) and the scan rate of 5 mV s(-1), respectively. Also, two-electrode system has good specific energy/specific power. The retention capacitance of three-and two-electrode systems, after 5000 charge-discharge cycles, were measured as 95.2% and 93.9%, respectively. The results confirm the high potential of synthesized nanocomposite in the application of supercapacitor electrode. (C) 2022 Elsevier B.V. All rights reserved.