One-step production of O-N-S co-doped three-dimensional hierarchical porous carbons for high-performance supercapacitors

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  • Gongyuan Zhao, Harbin Institute of Technology
  • ,
  • Chong Chen, Harbin Institute of Technology
  • ,
  • Dengfeng Yu, Harbin Institute of Technology
  • ,
  • Lei Sun, Harbin Institute of Technology
  • ,
  • Chenhui Yang, Harbin Institute of Technology
  • ,
  • Hong Zhang, Harbin Institute of Technology
  • ,
  • Ye Sun, Harbin Institute of Technology
  • ,
  • Flemming Besenbacher
  • Miao Yu, Harbin Institute of Technology

Besides the complex and low-yield synthesis, attaining high energy density whilst maintaining high power density remains as the major challenge for supercapacitor applications. Herein, we report one-step production of O-N-S co-doped hierarchical porous carbons (HPCs) from ant powder. The resultant product possesses a large specific surface area (2650 m(2) g(-1)), a typical three-dimensional (3-D) framework comprised of interconnected macro-, meso-and micropores with suitable pore size distribution, together with an appropriate heteroatom doping of O, N, and S. These distinct features have afforded an ultra-high specific capacitance of 576 F g(-1) at a current density of 1.0 A g(-1) in a three-electrode system and 352 F g(-1) at a current density of 0.1 A g(-1) in a two-electrode system, using 6 mol L-1 KOH aqueous as electrolyte. Moreover, the high rate retention of similar to 80% from 1.0 A g(-1) to 10.0 A g(-1) and the high cycling stability (similar to 5% loss over 10,000 cycles) have been also demonstrated. Most importantly, the fabricated symmetric supercapacitors using 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIMBF4) electrolyte delivered an energy density as high as 107 Wh kg(-1) at a power density of 900 W kg(-1), and a remarkable energy density of 67 Wh kg(-1) can be retained even at a power density as high as 18,000 W kg(-1). These values represent a new performance record for supercapacitors based on biomass-derived carbons, indicating the great promise of these HPCs for high-performance electrochemical energy storage.

Original languageEnglish
JournalNano Energy
Volume47
Pages (from-to)547-555
Number of pages9
ISSN2211-2855
DOIs
Publication statusPublished - May 2018

    Research areas

  • Hierarchical porous carbon, Co-doping, Supercapacitor, Biomass, High energy density, OXYGEN REDUCTION REACTION, SURFACE-AREA, ELECTRODE MATERIALS, ENERGY-STORAGE, ASYMMETRIC SUPERCAPACITOR, VOLUMETRIC CAPACITANCE, FACILE SYNTHESIS, ION BATTERIES, NITROGEN, NANOSHEETS

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