title: Functionalization of Petroleum Coke-Derived Carbon for Synergistically Enhanced Capacitive Performance.
abstract: Petroleum coke is a valuable and potential source for clean energy storage if it could be modified legitimately and facilely. In the present study, porous carbon with high surface area and abundant oxygen-containing groups was prepared from petroleum coke by chemical activation and modification processes. The as-prepared carbon exhibits a high surface area (1129 m(2) · g(-1)) and stable micrographic structure. It presents a high specific capacitance and excellent rate performance in KOH electrolyte. Even at an ultrahigh current density of 50 A · g(-1), the specific capacitance of the prepared carbon can still reach up to an unprecedented value of 261 F · g(-1) with a superhigh retention rate of 81 %. In addition, the energy density of this material in aqueous electrolyte can be as high as 13.9 Wh · kg(-1). The high energy density and excellent rate performance ensure its prosperous application in high-power energy storage system.
authors.affiliation: School of Chemical Engineering, State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao, 266580, People's Republic of China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: School of Chemical Engineering, State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao, 266580, People's Republic of China.
authors.forename: Xuejin
authors.initials: X
authors.lastname: Li
authors.affiliation: School of Chemical Engineering, State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao, 266580, People's Republic of China.
authors.forename: Jufeng
authors.initials: J
authors.lastname: Huang
authors.affiliation: School of Chemical Engineering, State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao, 266580, People's Republic of China. xingwei@upc.edu.cn.|School of Science, State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao, 266580, People's Republic of China. xingwei@upc.edu.cn.
authors.forename: Wei
authors.initials: W
authors.lastname: Xing
authors.affiliation: School of Chemical Engineering, State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao, 266580, People's Republic of China.
authors.forename: Zifeng
authors.initials: Z
authors.lastname: Yan
keywords: Activated carbon; Oxygen doping; Petroleum coke; Pseudo-capacitance; Supercapacitor