One-Step Microwave-Assisted Synthesis of MnFe2O4/rGO Nanocomposites and Their Electrochemical Properties in Supercapacitors

In the pursuit of energy conservation and sustainability, supercapacitors offer high power density, fast charge–discharge rates, and long cycle life, making them ideal for applications in electric vehicles and portable electronics. This study presents the synthesis of MnFe2O4/reduced graphene oxide (rGO) nanocomposites through a rapid, one-pot microwave-assisted hydrothermal method. This approach significantly reduces synthesis time relative to conventional hydrothermal techniques. The nanocomposites were structurally characterized using X-ray diffraction (XRD) and Raman spectroscopy, morphologically examined via transmission electron microscopy (TEM) and Brunauer–Emmett–Teller (BET) analysis, and chemically analyzed through Fourier-transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA). Electrochemical testing revealed a high specific capacitance of 196.6 F/g at 0.5 A/g, with 90.22% retention after 6000 cycles at 10 A/g. The superior performance is attributed to the synergistic effects of MnFe2O4 and rGO, enhancing charge storage and stability. These findings demonstrate the potential of microwave hydrothermal synthesis for scalable production of high-performance electrode materials for supercapacitors.