Abstract
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°C for 0.5h and 800°C for 1h with the mass ratio of KOH/hydrochars of 5:1, the high specific surface area and large pore volume of the porous carbons reached 3362m2/g and 2.20cm3/g, respectively. The specific capacitance of 312F/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.
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