One-step Synthesis and Electrochemical Properties of Reduced Graphene Oxide/MnO2 Composites

doi:10.15541/jim20150004

Abstract

Abstract:

Reduced graphene oxide/MnO₂ (RGO/M) composites were successfully prepared via one-step hydrothermal routine, in which graphene oxide serviced as the oxidant and Mn²⁺ as the reducer. The morphology and microstructure of the nanocomposites were characterized by X-ray diffraction (XRD) analysis, X-ray Photoelectron Spectroscope (XPS), Raman spectra (RS), Fourier transform infrared (FTIR) spectroscope and field emission scanning electron microscope (FESEM). In addition, the electrochemical properties of the composite were evaluated by cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy techniques for supercapacitor applications. The results indicate that the RGO/M composites displayed controllable specific capacitance in acidic electrolytes by adjusting the molar ratio of GO to manganous chloride at a specific hydrothermal reaction condition. In the optimal case, a specific capacitance of 277 F/g can be obtained in 1 mol/L H₂SO₄ at a scan current density of 1 A/g, with a capacitance retention of 98% after 500 cycles.

Key words: reduced graphene oxide, manganese dioxide, hydrothermal, specific capacitance, supercapacitor

CLC Number:

O646

HOU Yuan, ZHANG Bang-Wen, XING Rui-Guang, BULIN Chao-Ke. One-step Synthesis and Electrochemical Properties of Reduced Graphene Oxide/MnO₂ Composites[J]. Journal of Inorganic Materials, 2015, 30(8): 855-860.

Figures/Tables 11

Fig. 1 XRD patterns of NG, GO and RGO/M3 composite

Fig. 2 Raman spectra of GO and RGO/M3 composite

Fig. 3 XPS spectra of the RGO/M3 composite

Fig. 4 FTIR spectra of the GO and RGO/M3 composite

Fig. 5 FESEM images (a-c), FSEM image and the corresponding EDS elemental mapping images (d)

Fig. 6 Schematic of the formation mechanism of RGO/M composites

Fig. 7 Cyclic voltammograms of RGO/M and RGO with different molar ratios at a scan rate of 10 mV/s

Fig. 8 Discharge curves (at 1 A/g) of RGO/M with different molar ratios

Fig. 9 Cyclic voltammograms of RGO/M3 at various scan rates

Fig. 10 Nyquist plots of RGO/M3

Fig. 11 Cycle performance of RGO/M3 at a scan rate of 1 A/g

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One-step Synthesis and Electrochemical Properties of Reduced Graphene Oxide/MnO₂ Composites

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