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In this work, a simple facile route for preparing an rGO/MnFe 2 O 4 nanocomposite through a one-pot hydrothermal approach was demonstrated. Graphite oxide (GO) was prepared from graphite powder by a modified Hummers method. Fe(NO 3 ) 2 "9H 2 O and Mn(NO 3 ) 2 " H 2 O were used as the precursors for the preparation of the rGO/MnFe 2 O 4 nanocomposite. The formation of the rGO/MnFe 2 O 4 nanocomposite was confirmed by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), and Rama spectroscopy (Raman). The specific surface area of the prepared composite obtained by Brunauer-Emmett-Teller (BET) analysis was lower than that of pure rGO but higher than that of pure MnFe 2 O 4 . Consequently, the electrochemical performance was investigated by using a three-electrode cell system in 6.0 M KOH. The results show that the specific capacitance was determined to be 190.3, 276.9, and 144.5 F/g at a scan rate of 10 mV/s, and 194.9, 274.6, and 134.4 F/g at a current density of 5.0 A/g for rGO, rGO/(5 mmol) MnFe 2 O 4 , and rGO/(10 mmol) MnFe 2 O 4 , respectively. These results suggest that the composite of MnFe 2 O 4 nanoparticles on an rGO nanosheet can improve the capacitive behavior of the fabricated electrode, but the electrochemical properties are reduced when the MnFe 2 O 4 concentration ratio is high.

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