High-performance flexible solid-state supercapacitors based on MnO sub(2)-decorated nanocarbon electrodes

Flexible energy storage units are highly desired to meet the ever-increasing demands for flexible electronics. In this paper, highly flexible solid-state supercapacitors are fabricated using MnO sub(2)-decorated nanocarbon electrodes and 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide-...

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Bibliographic Details
Published in:RSC advances 2013-10, Vol.3 (43), p.20613-20618
Main Authors: Gao, Yang, Zhou, Yun Shen, Qian, Min, Li, Hao Ming, Redepenning, Jody, Fan, Li Sha, He, Xiang Nan, Xiong, Wei, Huang, Xi, Majhouri-Samani, Masoud, Jiang, Lan, Lu, Yong Feng
Format: Article
Language:English
Subjects:
Capacitors
Deposition
Electrodes
Electronics
Nanocomposites
Nanomaterials
Nanostructure
Supercapacitors
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Summary:Flexible energy storage units are highly desired to meet the ever-increasing demands for flexible electronics. In this paper, highly flexible solid-state supercapacitors are fabricated using MnO sub(2)-decorated nanocarbon electrodes and 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide-poly(vinylidene fluoride)-hexafluoropropylene ([EMIM][NTf2]-PVdF(HFP)) gel electrolytes. The flexible electrodes are prepared by electrodepositing MnO sub(2) onto the carbon nanotube/carbon nanoonion (CNT/CNO) films. CNT/CNO films have a large surface area for MnO sub(2) deposition and work as mechanical supports with high flexibility and light weight. CNOs act as spacers to separate CNTs, introducing mesopores inside the CNT/CNO films for preventing pore blocking during MnO sub(2) deposition. The supercapacitor exhibits enhanced electrochemical performance with an energy density of 16.4 W h super(-1) kg super(-1) at a power density of 33.3 kW kg super(-1) by using the [EMIM][NTf2]-PVdF(HFP) gel electrolyte. Moreover, the supercapacitors can exhibit high electrochemical performance under large mechanical stress, making the devices suitable for flexible electronics.
ISSN:2046-2069
DOI:10.1039/c3ra43039a