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Fabrication and Characterization of the Graphene Composites Containing Embedded Manganese Dioxide Nanoparticles.

Graphene composites containing embedded manganese dioxide (MnO2) were fabricated by simple solvothermal method. 100 nm to 200 nm size of nanoparticles were anchored on reduced graphene oxide layers. The MnO2/RGO composite with optimized molar concentration of manganese precursors in fixed graphene oxide mass was showed the highest specific capacitance of 186 F/g at 1 A/g. In addition, cycle life performance of MnO2/RGO composite was improved by using graphene having high electrical conductivity as a substrate. This result was related with prevention for collapse of the manganese nanoparticle. The structure and morphology analysis was confirmed by field emission scanning electron microscopy (FE-SEM) and Fourier-transform infrared spectroscopy (FT-IR). FE-SEM images explicitly revealed that MnO2 particles were attached on reduced graphene oxide layers.

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