Abstract
The Manganese dioxide/reduced graphene oxide (MnO2/RGO) double-shelled hollow microsphere with an improved electrical conductivity and accessible surface area has been synthesized using the monodispersive polystyrene (PS) microsphere as a self-sacrificing template. RGO/PS core–shell microsphere was prepared through π–π stacking interaction between PS microsphere and graphene oxide sheet, and then chemical reduction using hydrazine hydrate. MnO2/RGO/PS core-shell-shell microsphere was prepared through in situ chemical redox process between KMnO4 and benzyl alcohol-anchored RGO/PS. MnO2/RGO double-shelled hollow microsphere was obtained by etching PS microsphere from MnO2/RGO/PS using tetrahydrofuran. It had a pore diameter of 560–580 nm and layer thickness of 210–270 nm. Low charge transfer resistance of 0.3006 Ω and total electrochemical impedance of 2.37 Ω caused a high specific capacitance of 450.1 F g−1 at 0.2 A g−1. The capacitance retention of 81.7% after 1000 cycles indicated good cycling capability at 5 A g−1. MnO2/RGO double-shelled hollow microsphere presented the promising application for supercapacitor electrode material.
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ACKNOWLEDGMENT
The work was supported by National Natural Science Foundation of China (No. 21373047).
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Xie, Y., Ji, J. Synthesis and capacitance performance of MnO2/RGO double-shelled hollow microsphere. Journal of Materials Research 31, 1423–1432 (2016). https://doi.org/10.1557/jmr.2016.158
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DOI: https://doi.org/10.1557/jmr.2016.158