Journal
JOURNAL OF POWER SOURCES
Volume 359, Issue -, Pages 556-567Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2017.05.108
Keywords
Hierarchical porous carbon; Nitrogen-sulfur-oxygen doping; Supercapacitors; Aqueous and organic electrolyte
Funding
- National Natural Science Foundation of China [51674221]
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This work report the synthesis of porous carbon with hierarchical pore structure and uniform nitrogensulfur- oxygen doping. The favorable pore structure (micro-, meso-, and macro-pores) is beneficial to ion adsorption and transportation, and the doping heteroatoms can introduce electrochemical active sites which contribute to additional pseudocapacitance. Therefore, the carbon material shows good electrochemical performance when employed as supercapacitor electrode. High specific capacitance (367 F g(-1) at 0.3 A g(-1)), good rate performance and stable cycling characteristics are obtained in 6 M KOH. In addition, when tested in 1 M H2SO4, a higher specific capacitance (382 F g(-1) at 0.3 A g(-1)) is delivered. Furthermore, the assembled symmetric cell yields a maximum specific energy of 35.3 W h kg(-1) in 1 M TEABF(4)/AN, significantly improving the specific energy of carbon-based supercapacitors. (C) 2017 Elsevier B.V. All rights reserved.
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