Activated high specific surface area carbon aerogels for EDLCs

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• 作者：Nianping Liu ; Jun Shen ; ^{shenjun67@tongji.edu.cn} ; Dong Liu
• 关键词：Carbon aerogels ; Activation ; Electrical double-layer capacitors ; Specific surface area ; Organic electrolyte
• 刊名：Microporous and Mesoporous Materials
• 出版年：2013
• 出版时间：February, 2013
• 年：2013
• 卷：167
• 期：Complete
• 页码：176-181
• 全文大小：909 K

文摘

This paper shows that the performance of resorcinol-formaldehyde-based carbon aerogels in electrical double-layer capacitors (EDLCs) can be significantly enhanced by a simple treatment with CO₂ activation. The changes in the specific surface area lead to high capacitance values, which provide a noticeable energy density. The CO₂ activated carbon aerogels have a high specific surface area up to 3431 m²/g and specific capacitances three times higher than that of the raw carbon aerogels. The activated carbon aerogels obtained the specific capacitance at 152 F/g and energy density of 27.5 Wh/kg at the current density of 0.3 A/g in 1 M Et₄NBF₄-AN electrolyte. Furthermore, an excellent rate capability, low equivalent series resistance (ESR), and a good cycling stability over 8000 cycles of the resulting carbon aerogels were also confirmed by electrochemical measurements as galvanostatic charge-discharge, cyclic voltammetry and electrochemical impedance spectroscopy.