Preparation of porous carbon nanosheets and its electrochemical performance
XU Su-peng1,ZHENG An-xiong2
1 Department of Metallurgy and Chemical Engineering,Jiyuan Vocational and Technical College,Jiyuan 459000,China;2Technical Center of Henan Zhongyuan Special Steel Equipment manufacturing Co.,Ltd., Jiyuan 459000,China
Abstract:Two-dimensional(2D)porous carbon nanosheets were synthesized by a facile,low-cost method. Herein, coal tar pitch was used as a carbon precursor and sodium chloride was employed as a water soluble template. The highly porous carbon nanosheets were prepared by the carbonization of coal tar pitch and sodium chloride and the following KOH chemical activation. The as-prepared carbon nanosheets(AC-NaCl)possess a large specific surface area up to 1 581 m2/g. The resulting carbon sheets possess a thickness of less than 200 nm,which is beneficial to ion storage and transport due to the availability of more exposed active sites and the convenience of ion transport pathways. In 6 mol/L KOH electrolyte exhibits an outstanding capacitive performance(193 F/g ,1 A/g), and a good cycling durability with over 94.9% capacitance retention after 5000 charge- discharge cycles at 1 A/g.