Journal
NANOSCALE RESEARCH LETTERS
Volume 11, Issue -, Pages -Publisher
SPRINGEROPEN
DOI: 10.1186/s11671-016-1382-0
Keywords
Petroleum coke; Activated carbon; Oxygen doping; Supercapacitor; Pseudo-capacitance
Funding
- National Natural Science Foundation of China [21476264]
- Distinguished Young Scientist Foundation of Shandong Province [JQ201215]
- Taishan Scholar Foundation [ts20130929]
- Fundamental Research Funds for the Central Universities [15CX05029A, 15CX08009A, 15CX06038A]
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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.
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