Nanoporous carbons from oxidized green needle coke for use in high performance supercapacitors

WANG Jiu-zhou; WANG Li-qun; CHEN Ming-ming; WANG Cheng-yang; ZHANG Cui; HE Fei

doi:10.1016/S1872-5805(15)60180-9

Volume 30 Issue 2

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Article Navigation > New Carbon Mater. > 2015 > 30(2): 141-149

WANG Jiu-zhou, WANG Li-qun, CHEN Ming-ming, WANG Cheng-yang, ZHANG Cui, HE Fei. Nanoporous carbons from oxidized green needle coke for use in high performance supercapacitors. New Carbon Mater., 2015, 30(2): 141-149. doi: 10.1016/S1872-5805(15)60180-9

Citation:

WANG Jiu-zhou, WANG Li-qun, CHEN Ming-ming, WANG Cheng-yang, ZHANG Cui, HE Fei. Nanoporous carbons from oxidized green needle coke for use in high performance supercapacitors. New Carbon Mater., 2015, 30(2): 141-149. doi: 10.1016/S1872-5805(15)60180-9

Citation:

WANG Jiu-zhou, WANG Li-qun, CHEN Ming-ming, WANG Cheng-yang, ZHANG Cui, HE Fei. Nanoporous carbons from oxidized green needle coke for use in high performance supercapacitors. New Carbon Mater., 2015, 30(2): 141-149. doi: 10.1016/S1872-5805(15)60180-9

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Nanoporous carbons from oxidized green needle coke for use in high performance supercapacitors

doi: 10.1016/S1872-5805(15)60180-9

Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

Funds: National Natural Science Foundation of China (51372168); Natural Science Foundation of Tianjin City (12JCZDJC27000).

Received Date: 2014-11-23
Accepted Date: 2015-05-04
Rev Recd Date: 2015-04-01
Publish Date: 2015-04-28

Abstract

Abstract

Green needle coke was oxidized by a mixture of HNO₃ and H₂SO₄ (3:7 vol/vol) acids. The resultant oxidized coke was separated into water dispersible and non-dispersible fractions, which were then activated by KOH using the same KOH/coke weight ratio to obtain two kinds of nanoporous carbons with different pore structures. The oxidized coke and the nanoporous carbons were characterized by XPS, XRD, TEM, N₂ adsorption and electrochemical tests. Results indicate that, at the same KOH/coke ratios, the nanoporous carbons derived from the water-dispersible oxidized coke have higher mass specific capacitances and capacitance retention ratios, and lower resistances than those from the non-dispersible ones when used as an electric double layer capacitor electrode in 6 mol/L KOH, but the former have a lower volumetric specific capacitance than the latter.
- Supercapacitor,
- Water dispersible intermediate,
- Surface property,
- Porous structure,
- Rate performance

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References(22)

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