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| 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 |
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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.
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Received: 05 November 2019
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2020, Vol. 30 
