Статья

Carbon-Based Supercapacitors Produced by Activation of Graphene

Yanwu ZhuDepartment of Mechanical Engineering and Materials Science and Engineering Program, University of Texas at Austin, One University Station C2200, Austin, TX 78712, USAShanthi MuraliDepartment of Mechanical Engineering and Materials Science and Engineering Program, University of Texas at Austin, One University Station C2200, Austin, TX 78712, USAMeryl D. StollerDepartment of Mechanical Engineering and Materials Science and Engineering Program, University of Texas at Austin, One University Station C2200, Austin, TX 78712, USAK. J. GaneshDepartment of Mechanical Engineering and Materials Science and Engineering Program, University of Texas at Austin, One University Station C2200, Austin, TX 78712, USAWeiwei CaiDepartment of Mechanical Engineering and Materials Science and Engineering Program, University of Texas at Austin, One University Station C2200, Austin, TX 78712, USAPaulo J. FerreiraDepartment of Mechanical Engineering and Materials Science and Engineering Program, University of Texas at Austin, One University Station C2200, Austin, TX 78712, USAAdam PirkleDepartment of Materials Science and Engineering, University of Texas at Dallas, 800 West Campbell Road, Richardson, TX 75080, USARobert M. WallaceDepartment of Materials Science and Engineering, University of Texas at Dallas, 800 West Campbell Road, Richardson, TX 75080, USAKatie A. CychoszMatthias ThommesDong SuCenter for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973, USAEric A. StachCenter for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973, USARodney S. RuoffDepartment of Mechanical Engineering and Materials Science and Engineering Program, University of Texas at Austin, One University Station C2200, Austin, TX 78712, USA

2011en

ABI

Аннотация

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 sp(2)-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.

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Идентификаторы

DOI: 10.1126/science.1200770

Цитирования и источники

Цитирований: 4Использованных источников: 0

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