Electrochemical performance of high surface area activated carbons derived from coal tar pitch

WANG Kai; GAO Chao; LI Song-en; WANG Jin-yu; TIAN Xiao-dong; SONG Yan

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Article Navigation > New Carbon Mater. > 2018 > 33(6): 562-570

WANG Kai, GAO Chao, LI Song-en, WANG Jin-yu, TIAN Xiao-dong, SONG Yan. Electrochemical performance of high surface area activated carbons derived from coal tar pitch. New Carbon Mater., 2018, 33(6): 562-570.

Citation:

WANG Kai, GAO Chao, LI Song-en, WANG Jin-yu, TIAN Xiao-dong, SONG Yan. Electrochemical performance of high surface area activated carbons derived from coal tar pitch. New Carbon Mater., 2018, 33(6): 562-570.

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Electrochemical performance of high surface area activated carbons derived from coal tar pitch

1.
Institute of Science and Technology, Shanxi Coal Import and Export Group Co., LTD, Taiyuan 030006, China;
2.
Post-doctoral scientific research stations, Shanxi Coal Import and Export Group Co., LTD, Taiyuan 030006, China;
3.
Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China

Received Date: 2018-09-28
Accepted Date: 2018-12-27
Rev Recd Date: 2018-11-23
Publish Date: 2018-12-28

Abstract

Abstract

High surface area activated carbons were prepared by the KOH activation of coal tar pitch. Two purification methods were used, (i) the pitch was deashed before activation or (ii) the activated carbon was deashed after activation, both with hydrochloric acid and hydrofluoric acid. The effect of the deashing methods on the ash content, morphology, pore structure and electrochemical performance of the carbons for use as supercapacitor electrode materials was investigated. Results indicate that the activated carbon prepared with the pre-deashing treatment has a lower ash content (0.1 wt.%), higher surface area (2722 m² g^-1) and better electrochemical performance than the one produced by the post deashing method. The pre-deashed sample has a specific capacitance of 295 F g^-1 at a current density of 0.2 A g^-1, a good rate capability of 192 F g^-1 at 10 A g^-1 and a capacitance retention rate of 99% after 5000 charge-discharge cycles. A symmetrical supercapacitor using the pre-deashed sample delivers an energy density of 9.1 Wh kg^-1 at a power density of 50 Wh kg^-1.
- Coal tar pitch,
- Ash,
- Purification,
- Electrode materials,
- Cycling stability

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References(17)

References

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