科研之友
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摘要
In the present work, a sustainable route to prepare high-performance porous carbons from hydrochars by KOH activation was described. The hydrochars was obtained from sulfuric acid hydrolyzate of rice husk via dehydration, polymerization and carbonization. When the pretreated hydrochars (42%) was activated at 400 degrees C for 0.5 hand 800 degrees C for 1 h with the mass ratio of KOH/hydrochars of 5:1, the high specific surface area and large pore volume of the porous carbons reached 3362 m(2)/g and 2.20 cm(3)/g, respectively. The specific capacitance of 312 F/g was achieved using this product, which indicated the porous carbon had good electrochemical performance. Furthermore, the X-ray diffraction pattern and Raman spectroscopy showed the porous carbon had localized graphitic structure.
