Graphene-Based Ultracapacitors

Meryl D. Stoller(The University of Texas at Austin), Sungjin Park(The University of Texas at Austin), Yanwu Zhu(The University of Texas at Austin), Jinho An(The University of Texas at Austin), Rodney S. Ruoff(The University of Texas at Austin)
Nano Letters
September 13, 2008
10.1021/nl802558y
Cited by 8,301

Abstract

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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