Hydrothermal synthesis and electrochemical performance of GNPs-doped MgFe2O4 electrodes for supercapacitors

Abstract

This study sought to determine the effect of graphene on the electrochemical performance of MgFe2O4. The electrode preparation was done directly on the nickel foam surface using a hydrothermal technique. The crystallographic, morphological, and chemical configurations of the electrode components were investigated using XRD, FTIR, XPS, SEM, and TEM. Cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectrometry (EIS) were used to evaluate its electrochemical characteristics. The findings of the characterization demonstrate that MgFe2O4 was successfully synthesized with GNPs in a porous structure on a Ni foam surface. The electrochemical experiments show that the greatest specific capacitance (Cs) value found is 828 mF/cm2 at 1 mA current. At the same time, its stability after 1500 cycles at 4 mA was observed to be 136%, and its energy-power densities were calculated to be 28.75 mWh/cm2 and 200 mW/cm2. The Cs value in this study is roughly 242% higher than pure MgFe2O4 and 95% higher than MgFe2O4/GNPs in the literature, which is a significant effect of GNPs.