Development and Comprehensive Analysis of rGO/Co3O4@Ni nanocomposite: Dual-Functional Materials for Magnetic and Supercapacitor Applications

This work involved the hydrothermal synthesis of rGO/Co ₃ O ₄ @Ni nanocomposites at low temperatures, followed by annealing at 600°C. The microstructural and electrochemical characteristics of the nanostructured rGO/Co ₃ O ₄ @Ni were evaluated in detail. A Co ₃ O ₄ cubic structure with the space group Fd̅3m(227) and distinct peaks at the (220), (311), (222), (400), (422), (511), and (440) planes was formed, according to XRD analysis. Raman measurements confirmed the presence of Co-O bonds and provided detailed information on the microstructure of the samples. SEM analysis of the shape and surface architecture demonstrated the unique properties of the porous nanoparticles. The existence of Co ²⁺ and Co ³⁺ ions was verified by XPS. The nanocomposites demonstrated improved electrochemical stability and a peak capacitance of 1056 F/g at a current density of 1 A/g in electrochemical tests carried out in an aqueous 1M KOH electrolyte.