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Functionalized activated carbon prepared form petroleum coke with high-rate supercapacitive performance

Published online by Cambridge University Press:  08 November 2016

Yan Zhang ,
Tonghui Cai ,
Jufeng Huang ,
Wei Xing  and
Zifeng Yan
Yan Zhang
Affiliation:
School of Chemical Engineering, State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, People's Republic of China
Tonghui Cai
Affiliation:
School of Chemical Engineering, State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, People's Republic of China
Jufeng Huang
Affiliation:
School of Science, State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, People's Republic of China
Wei Xing*
Affiliation:
School of Science, State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, People's Republic of China
Zifeng Yan*
Affiliation:
School of Chemical Engineering, State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, People's Republic of China
*
a) Address all correspondence to this author. e-mail: xingwei@upc.edu.cn
a) Address all correspondence to this author. e-mail: xingwei@upc.edu.cn
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Abstract

Petroleum coke (PC) is a low-cost and potential carbon source for electrochemical energy storage. To expand the utilization of PC in supercapacitor, PC-based activated carbons (PCACs) with heteroatoms-doped were prepared from PC by KOH chemical activation. The as-prepared carbon exhibited a high surface area (2326.4 m2/g) and hierarchical micro-mesoporous structure, resulting in a high specific capacitance (421 F/g at 1 A/g) and excellent rate performance in KOH electrolyte (217 F/g at 50 A/g). Meanwhile, to improve the high-rate capacitive performance of PCACs in H2SO4 electrolyte, functionalized activated carbon (HQ/PCAC-4) was prepared by physically adsorbing the hydroquinone (HQ) on PCACs. The HQ/PCAC-4 showed an unprecedented capacitance value of 300.2 F/g even at an ultrahigh current density of 50 A/g. In addition, the energy density of HQ/PCAC-4 in H2SO4 electrolyte reached 19.5 W h/kg. The high energy density and excellent rate performance ensured their prosperous application in high-power energy storage system.

Keywords

electrical propertiesenergy storagenanostructure

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Articles
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Journal of Materials Research , Volume 31 , Issue 23 , 14 December 2016 , pp. 3723 - 3730
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Copyright © Materials Research Society 2016 

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