Graphene-Based Ultracapacitors

Meryl D. Stoller, Sungjin Park, Yanwu Zhu, Jinho An and Rodney S. Ruoff*
Department of Mechanical Engineering and Texas Materials Institute, University of Texas at Austin, One University Station C2200, Austin, Texas, 78712-0292
Nano Lett., 2008, 8 (10), pp 3498–3502
DOI: 10.1021/nl802558y
Publication Date (Web): September 13, 2008
Copyright © 2008 American Chemical Society
* To whom correspondence should be addressed. E-mail: r.ruoff@mail.utexas.edu.

Abstract

Abstract Image

The surface area of a single graphene sheet is 2630 m2/g, substantially higher than values derived from BET surface area measurements of activated carbons used in current electrochemical double layer capacitors. Our group has pioneered a new carbon material that we call chemically modified graphene (CMG). CMG materials are made from 1-atom thick sheets of carbon, functionalized as needed, and here we demonstrate in an ultracapacitor cell their performance. Specific capacitances of 135 and 99 F/g in aqueous and organic electrolytes, respectively, have been measured. In addition, high electrical conductivity gives these materials consistently good performance over a wide range of voltage scan rates. These encouraging results illustrate the exciting potential for high performance, electrical energy storage devices based on this new class of carbon material.

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History

  • Published In Issue October 08, 2008
  • Article ASAPSeptember 13, 2008
  • Received: August 22, 2008

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