Nanostructured spinel manganese cobalt ferrite for high-performance supercapacitors

Abstract

We report on the synthesis of manganese cobalt ferrite (MnCoFeO₄) nanoparticles via a simple one-pot co-precipitation method and their characterization through energy-dispersive spectroscopy (EDS), X-ray diffraction (XRD), high-resolution transmission electron microscopy (HR-TEM), Fourier transform infrared (FT-IR) spectroscopy and N₂ adsorption/desorption techniques. The MnCoFeO₄ supercapacitor showed the maximum specific capacitance of 675 F g⁻¹ at a scan rate of 1 mV s⁻¹. Its energy and power densities were 18.85 W h kg⁻¹ and 337.50 W kg⁻¹, respectively, at a current density of 1.5 A g⁻¹. The cyclic stability was scrutinized via galvanostatic charging/discharging (GCD) and electrochemical impedance spectroscopy (EIS). The degradation of the supercapacitive performance was only 7.14% after 1000 GCD cycles, indicating an excellent long-term stability. The equivalent series resistance (ESR) remained nearly constant even after 1000 GCD cycles.