Abstract
MnO2 nanoparticle/three dimensional graphene composite (MnO2/3DG) was synthesized by a hydrothermal template-free method and subsequent ultrasonic treatment in KMnO4 solution. The MnCO3/3DG particles can be detected after the hydrothermal process, which may be produced through the reaction between Mn2+ and \({\text{C}}{{\text{O}}_{\text{3}}}^{{\text{2}} - }\) due to the decarboxylation of GO under the hydrothermal condition. The final product MnO2/3DG displayed high specific capacitance (324 F g− 1 at 0.4 A g−1) and good cycle stability (91.1% capacitance retention after 5000 cycles). Furthermore, the asymmetric supercapacitor assembled with MnO2/3DG and activated carbon (AC) exhibits an energy density of 33.78 Wh kg−1 at the powder density of 380 W kg−1. The excellent supercapacitance of the MnO2/3DG composite may be due to the high pseudocapacitance of the dispersed MnO2 nanoparticles and the conductive graphene with three dimensional porous microstructure.
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Acknowledgements
The authors would like to thank the National Natural Science Foundation of China (21301159), Natural Science Research Assistance Program from the Education Department of Henan Province (15A150083) and Program of Zhengzhou City for Science and Technology (20150440) for financial support.
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Wang, P., Zhou, C., Wang, S. et al. Facial synthesis of MnO2/three dimensional graphene composite and its application in supercapacitors. J Mater Sci: Mater Electron 28, 12514–12522 (2017). https://doi.org/10.1007/s10854-017-7074-4
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DOI: https://doi.org/10.1007/s10854-017-7074-4