Graphene/MnO2 hybrid nanosheets as high performance electrode materials for supercapacitors

Graphene/MnO2 hybrid nanosheets were prepared by incorporating graphene and MnO2 nanosheets in ethylene glycol. Scanning electron microscopy and transmission electron microscopy analyses confirmed nanosheet morphology of the hybrid materials. Graphene/MnO2 hybrid nanosheets with different ratios wer...

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Bibliographic Details
Published in:Materials chemistry and physics 2014-01, Vol.143 (2), p.740-746
Main Authors: Mondal, Anjon Kumar, Wang, Bei, Su, Dawei, Wang, Ying, Chen, Shuangqiang, Zhang, Xiaogang, Wang, Guoxiu
Format: Article
Language:English
Subjects:
Composite materials
Crystal structure
Electrochemical properties
Electron microscopy
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Summary:Graphene/MnO2 hybrid nanosheets were prepared by incorporating graphene and MnO2 nanosheets in ethylene glycol. Scanning electron microscopy and transmission electron microscopy analyses confirmed nanosheet morphology of the hybrid materials. Graphene/MnO2 hybrid nanosheets with different ratios were investigated as electrode materials for supercapacitors by cyclic voltammetry (CV) and galvanostatic charge–discharge in 1 M Na2SO4 electrolyte. We found that the graphene/MnO2 hybrid nanosheets with a weight ratio of 1:4 (graphene:MnO2) delivered the highest specific capacitance of 320 F g−1. Graphene/MnO2 hybrid nanosheets also exhibited good capacitance retention on 2000 cycles. •Graphene/MnO2 hybrid nanosheets with different ratios were fabricated.•The specific capacitance is strongly dependent on graphene/MnO2 ratios.•The graphene/MnO2 hybrid electrode (1:4) exhibited high specific capacitance.•The electrode retained 84% of the initial specific capacitance after 2000 cycles.
ISSN:0254-0584
1879-3312
DOI:10.1016/j.matchemphys.2013.10.008