Abstract
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 3431m2/g and specific capacitances three times higher than that of the raw carbon aerogels. The activated carbon aerogels obtained the specific capacitance at 152F/g and energy density of 27.5Wh/kg at the current density of 0.3A/g in 1M Et4NBF4–AN electrolyte. Furthermore, an excellent rate capability, low equivalent series resistance (ESR), and a good cycling stability over 8000cycles of the resulting carbon aerogels were also confirmed by electrochemical measurements as galvanostatic charge–discharge, cyclic voltammetry and electrochemical impedance spectroscopy.
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