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taozhikai

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[资源] science最新:石墨烯超级电容器

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 exfoliatedgraphite oxide, we synthesized a porous carbon with a Brunauer-Emmett-Teller surface area of upto 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-electrodesupercapacitor 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.
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谢谢!
53楼2011-11-17 16:21:39
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