Graphene-Based Ultracapacitors

作者：Meryl D. Stoller, Sungjin Park, Yanwu Zhu, Jinho An, Rodney S. Ruoff · 发表于：Nano Letters · 年份：2008 · DOI：10.1021/nl802558y · 被引用次数：8373 · 研究领域：Supercapacitor Materials and Fabrication、Graphene research and applications、Advancements in Battery Materials

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.