Preparation and electrochemical properties of porous carbon derived from biomass tar
With the advancement of economy and society and the increment of normal asset utilization,people gives increasingly more consideration to the improvement of energy equipment with low price,long cycle life and high power density.More and more attention has been paid to biomass-based porous carbon supercapacitors.Using biomass tar as a precursor,a one-step carbonization and activa-tion method was adopted to prepare carbon materials.In this paper,the morphology and structure of porous carbon were characterized by SEM and BET,the effects of the proportion of activator to carbon,activation temperature and activation time on the microstructure and electrochemical properties of biomass tar-based porous carbon were investigated.When the activation temperature is 700℃,the activation time is 1.5 hours,and the ratio of potassium hydroxide to biomass tar is 2∶1,a porous carbon material with the specific sur-face area of 2137.3 m2·g-1 was obtained.When used as the electrode for supercapacitor,the porous carbon electrode shows a capaci-tance of 276.2 F/g at the current density of 1.0 A/g.When the current density is increased from 0.1 A/g to 5.0 A/g,the FC700-2-1.5 has a high capacitance retention of 74.02%.In this work,the activated carbon for the supercapacitor was made from biomass waste,and it is a novel approach to achieving high-value utilization of biomass waste.
Supercapacitorsporous carbonelectrochemical propertiesbiomass tarelectrode material
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