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Enhanced Capacitive Performance of N-Doped Activated Carbon from Petroleum Coke by Combining Ammoxidation with KOH
Yan Zhang1, Yu Zhang2, Jufeng Huang2
1State Key Laboratory of Heavy Oil Processing, Key Laboratory of Catalysis, CNPC, School of Chemical Engineering, China University of Petroleum, Qingdao, 266580, People's Republic of China.
Abstract:
Low cost with high specific capacitance and energy density is the critical and main requirement for practical supercapacitors. A novel N-doped activated carbon was fabricated by KOH activation of petroleum coke and ammonia treatment. The as-prepared carbon exhibits a high specific surface area (1875 m(2) g(-1)), excellent conductivity (57 S m(-1)), and rich nitrogen level (4.0 wt%). Those outstanding characters result in this porous carbon a hopeful electrode material for electrochemical supercapacitors. It shows high specific capacitance (up to 299 F g(-1)) and superior rate capability (76 % retention ratio at 20 A g(-1)) in 30 wt% KOH aqueous electrolyte. This efficient treatment method ensures its prosperous application in energy storage systems.
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