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Nano Lett. 2008 Oct;8(10):3498-502. doi: 10.1021/nl802558y. Epub 2008 Sep 13.

Graphene-based ultracapacitors.

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Department of Mechanical Engineering and Texas Materials Institute, University of Texas at Austin, One University Station C2200, Austin, Texas 78712-0292, USA.


The surface area of a single graphene sheet is 2630 m(2)/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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