Synthesis of NiO/ZnO/GO nanocomposites derived from Ni-Zn-H2BDC metal−organic framework for high-performance supercapacitor electrodes

Abstract

The NiO/ZnO/graphene oxide (GO) nanocomposite was created for use in supercapacitor electrode materials. The GO component was synthesized using a modified version of the Hummers' method, NiO/ZnO nanomaterials have been successfully synthesized through the derivation of a Ni-Zn-H2BDC based metal-organic framework (Ni-Zn-MOF) and the nanocomposite of NiO/ZnO/GO was synthesized using the co-precipitation method. Material characterization techniques, including XRD, FTIR, FE-SEM, and EDX, were employed to assess the structure and purity of the synthesized material, confirming its successful synthesis. Electrochemical tests were conducted to evaluate the effectiveness of the synthesized materials as supercapacitor electrodes. These tests encompassed cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS) in an alkaline electrolyte (3 M KOH). The electrochemical tests were performed on Ni-Zn-H2BDC, NiO/ZnO, GO, and NiO/ZnO/GO nanocomposite electrodes in a 3 M KOH environment. Notably, the NiO/ZnO/GO nanocomposite electrode exhibited the highest specific capacity at a current density of 0.5 A/g, reaching 1800 F/g. These results demonstrate the superior charge-discharge capabilities and capacity of the synthesized NiO/ZnO/GO nanocomposite, confirming the success of the study.