Nano Archive

Graphene-based electrochemical supercapacitors

Vivekchand, S. R. C. and Rout, Chendra Shekar and Subrahmanyam, K. S. and Govindaraj, Achutharao and Rao, C. N. R. (2008) Graphene-based electrochemical supercapacitors. Journal of CHEMICAL SCIENCES, 120 (1). pp. 9-13.

Full text is not hosted in this archive but may be available via the Official URL, or by requesting a copy from the corresponding author.

Official URL: http://www.ias.ac.in/chemsci/Pdf-Jan2008/9.pdf

Abstract

Graphenes prepared by three different methods have been investigated as electrode materials in electrochemical supercapacitors. The samples prepared by exfoliation of graphitic oxide and by the transformation of nanodiamond exhibit high specific capacitance in aq. H2SO4, the value reaching up to 117 F/g. By using an ionic liquid, the operating voltage has been extended to 3⋅5 V (instead of 1 V in the case of aq. H2SO4), the specific capacitance and energy density being 75 F/g and 31⋅9 Wh kg–1 respectively. This value of the energy density is one of the highest values reported to date. The performance characteristics of the graphenes which are directly related to the quality, in terms of the number of layers and the surface area, are superior to that of single-walled and multi-walled carbon nanotubes.

Item Type:Article
Subjects:Physical Science > Nanophysics
Material Science > Nanochemistry
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:2917
Deposited By:JNCASR
Deposited On:20 Jan 2009 11:15
Last Modified:08 Apr 2009 15:33

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