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分享一篇最新的2011年6月24日Science上的石墨烯的文章
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最新的关于石墨烯的文献！ 与你共享！Carbon-Based Supercapacitors Produced by Activation of GrapheneYanwu Zhu,1 Shanthi Murali,1 Meryl D. Stoller,1 K. J. Ganesh,1 Weiwei Cai,1 Paulo J. Ferreira,1 Adam Pirkle,2 Robert M. Wallace,2 Katie A. Cychosz,3 Matthias Thommes,3 Dong Su,4 Eric A. Stach,4 Rodney S. Ruoff1* Supercapacitors, also called ultracapacitors or electrochemical capacitors, store electrical charge on high-surface-area conducting materials. Their widespread use is limited by their low energy storage density and relatively high effective series resistance. Using chemical activation of exfoliated graphite oxide, we synthesized a porous carbon with a Brunauer-Emmett-Teller surface area of up to 3100 square meters per gram, a high electrical conductivity, and a low oxygen and hydrogen content. This sp2-bonded carbon has a continuous three-dimensional network of highly curved, atom-thick walls that form primarily 0.6- to 5-nanometer-width pores. Two-electrode supercapacitor cells constructed with this carbon yielded high values of gravimetric capacitance and energy density with organic and ionic liquid electrolytes. The processes used to make this carbon are readily scalable to industrial levels. [ Last edited by 0513flpb on 2011-8-30 at 16:26 ] |
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2011-07-01 08:37
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2011-07-01 10:25
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2011-07-02 23:38
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