Design and synthesis of Mn-Ni ferrite/rGO hybrid nanostructures for enhanced electrochemical performance in supercapacitor applications

Manganese-nickel ferrite (Mn-Ni ferrite) and reduced graphene oxide (rGO) composites were synthesized and assessed as potential electrode materials for supercapacitors. The rGO was prepared using a modified Hummers’ method, while Mn-Ni ferrite was produced through an auto-combustion process. The composites were created by mixing different ratios of Mn-Ni ferrite with rGO, resulting in a series of Mn-Ni ferrite/rGO composites (MNR(x)(1-x)), where x = 0, 0.25, 0.5, 0.75, and 1 g. X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) were used to analyze the crystalline structure and functional groups, while scanning electron microscopy (SEM) examined the morphology, collectively confirming the successful formation and even dispersion of ferrite nanoparticles over the rGO sheets. Electrochemical properties were studied using cyclic voltammetry (CV), galvanostatic charge–discharge (GCD), and electrochemical impedance spectroscopy (EIS). The MNR55 composite (x = 0.5) exhibited the highest specific capacitance of 485 Fg -1 at a scan rate of 10 mVs -1 . These results indicate that Mn-Ni ferrite/rGO composites are promising, cost-effective, and environmentally friendly electrode materials for high-performance supercapacitors.