Fabrication of manganese ferrite-reduced graphene oxide nanostructure as an electrode material for high performance supercapacitor

Recent studies corroborate spinel transition metal oxides as an apical and paramount electrode materials for supercapacitors as an energy storage device, however, some adventitious stability factors restrict their practical applications. The low specific energy and poor electrical conductivity are assumed as prime factors of concerns for these prospective electrode materials. To address such issues, in the current study, we have employed an integrative strategy to synthesize a three-dimensional hierarchical electrode material consisting of manganese ferrite-reduced graphene oxide (MnFe₂O₄@rGO) nanostructures by a straightforward hydrothermal procedure and subsequently explored its electrocapacitive performance. X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDAX), and X-ray photo spectrometer (XPS) have all been used to analyse the physicochemical properties of the materials. Moreover, using a three-electrode system and a 3 M KOH electrolyte solution, the electrocapacitive performances of the as-synthesised samples have been assessed through galvanostatic charge–discharge (GCD), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). As-prepared hierarchical electrode material exhibits gravimetric specific capacitance of 399.17 Fg⁻¹ at a current density of 0.65 Ag⁻¹ with Galvanostatic charging/discharging (GCD) technique and energy density (40.05 Wh/Kg) at power density (276.2 W/Kg. Furthermore, after 5000 cycles with ~ 12% retention, the as-synthesised electrodic nanocomposite shows satisfactory GCD stability without noticeable capacitance deterioration. The MnFe₂O₄@rGO nano-composite, as synthesised, demonstrates impressive power/energy densities and could be investigated as a potential electrode architecture for large-scale energy storage devices.