Physical and electrochemical characterization of activated carbons with high mesoporous ratio for supercapacitors based on ionic liquid as the electrolyte

Springer Science and Business Media LLC - Tập 15 - Trang 607-613 - 2010
Guohua Sun1,2, Kaixi Li1, Yue Liu1,2, Jian Wang1, Hongwei He1,2, Jianlong Wang1,2, Jianyu Gu1,2, Yanqiu Li1,2
1Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, People’s Republic of China
2Graduate School, Chinese Academy of Sciences, Beijing, People’s Republic of China

Tóm tắt

A series of activated carbons with high mesoporous ratio were prepared by KOH reactivation based on activated carbon as the precursor. As the KOH/AC mass ratio was increased to 4:1, the mesoporous ratio increases from 60% to 76%, and the average pore size from 2.23 to 3.14 nm. Moreover, the specific capacitance for the activated carbon in ionic liquid 1-ethyl-3-methylmidazolium tetrafluoroborate ([EMIm]BF4) can reach the maximum value of 189 F g−1 (8.0 μF cm−2). In addition, the decrease of specific capacitance for activated carbons by KOH reactivation with current density increase shows two regimes, suggesting that activated carbons with high mesoporous ratio are much fit for charge–discharge at larger current density.

Tài liệu tham khảo

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