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

Yang Gao, Yun Shen Zhou, Min Qian, Hao Ming Li, Jody Redepenning, Li Sha Fan, Xiang Nan He, Wei Xiong, Xi Huang, Masoud Majhouri-Samani, Lan Jiang, Yong Feng Lu

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Abstract

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 MnO2-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 MnO2 onto the carbon nanotube/carbon nanoonion (CNT/CNO) films. CNT/CNO films have a large surface area for MnO2 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 MnO2 deposition. The supercapacitor exhibits enhanced electrochemical performance with an energy density of 16.4 W h-1 kg-1 at a power density of 33.3 kW kg-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.

Original languageEnglish (US)
Pages (from-to)20613-20618
Number of pages6
JournalRSC Advances
Volume3
Issue number43
DOIs
Publication statusPublished - Nov 21 2013

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ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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