期刊
CARBON
卷 99, 期 -, 页码 203-211出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2015.11.079
关键词
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资金
- National Natural Science Foundation of China [51172163, U1230113]
- National Key Technology RAMP
- D Program of China [2013BAJ01B01]
- National High Technology Research and Development Program of China (863) [2013AA031801]
- China Postdoctoral Science Foundation [2015M581656]
High-surface-area carbon aerogels are synthesized by pyrolysis of nanocellulose aerogels that are prepared by dissolving of cellulose microcrystalline in NaOH aqueous solutions followed by gelation, regeneration and freeze drying or supercritical CO2 drying. The obtained carbon aerogels are further treated via a CO2 activation process. The result shows that the nanocellulose aerogels dried by supercritical CO2 exhibit a high specific surface area (299 m(2)/g) and the obtained carbon aerogels preserve the interconnected 3D nanostructure and have a high specific surface area of 892 m(2)/g and a high pore volume of 1.80 cm(3)/g, which increase to 1873 m(2)/g and 2.65 cm(3)/g respectively after CO2 activation. The highly porous and interconnected nanostructure provides efficient migration of electrolyte ions and electrons, which makes the resultant activated carbon aerogels exhibit excellent electrochemical performance for supercapacitors. The specific capacitances reach 302 and 205 F/g at a current density of 0.5 and 20 A/g respectively within a potential window of -1.0 to 0 V in 6 M KOH solution. The capacitance retains 92% after 4000 cycles of charge/discharge, implying a good cycling stability. (C) 2015 Elsevier Ltd. All rights reserved.
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