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Synthesis and capacitance performance of MnO2/RGO double-shelled hollow microsphere

Published online by Cambridge University Press:  25 April 2016

Yibing Xie  and
Jingjing Ji
Yibing Xie*
Affiliation:
School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China
Jingjing Ji
Affiliation:
School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China
*
a)Address all correspondence to this author. e-mail: [email protected]
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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.

Keywords

microstructurenanostructureenergy storage
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 10 , 28 May 2016 , pp. 1423 - 1432
Copyright
Copyright © Materials Research Society 2016 

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