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Synthesis of MnO2/short multi-walled carbon nanotube nanocomposite for supercapacitors

机译：Synthesis of MnO2/short multi-walled carbon nanotube nanocomposite for supercapacitors

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Multi-walled carbon nanotubes (MWNTs) were selectively etched in molten nitrate to produce short MWNTs (s-MWNTs). MnO2/s-MWNT nanocomposite was synthesized by a reduction of potassium permanganate under microwave irradiation. For comparative purpose, MnO2/MWNT nanocomposite was also synthesized and investigated for its physical and electrochemical performance. Uniform and conformal MnO2 coatings were more easily formed on the surfaces of individual s-MWNTs. MnO2/s-MWNT nanocomposite estimated by cyclic voltammetry (CV) in 0.5 M Na2SO4 aqueous solution had the specific capacitance as high as 392.1 F g(-1) at 2 mV s(-1). This value was more than 48.9 larger than MnO2/s-MWNT nanocomposite. In addition, MnO2/s-MWNT nanocomposite was also examined by repeating the CV test at a scan rate of 50 mV s(-1), exhibiting an excellent cycling stability along with 99.2 specific capacitance retained after 1000 cycles. Therefore, MnO2/s-MWNT nanocomposite is a promising electrode material in the supercapacitors. (C) 2013 Elsevier B.V. All rights reserved.

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