Biowaste-Derived Hierarchical Porous Carbon Nanosheets for Ultrahigh Power Density Supercapacitors

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

DOI

  • Dengfeng Yu, Harbin Institute of Technology
  • ,
  • Chong Chen, Harbin Institute of Technology
  • ,
  • Gongyuan Zhao, Harbin Institute of Technology
  • ,
  • Lei Sun, Harbin Institute of Technology
  • ,
  • Baosheng Du, Harbin Institute of Technology
  • ,
  • Hong Zhang, Harbin Institute of Technology
  • ,
  • Zhuo Li, Harbin Institute of Technology
  • ,
  • Ye Sun, Harbin Institute of Technology
  • ,
  • Flemming Besenbacher
  • Miao Yu, Harbin Institute of Technology

Low-cost activated carbons with high capacitive properties remain desirable for supercapacitor applications. Herein, a three-dimensional scaffolding framework of porous carbon nanosheets (PCNSs) has been produced from a typical biowaste, namely, ground cherry calyces, the specific composition and natural structures of which have contributed to the PCNSs having a very large specific surface area of 1612 m(2) g(-1), a hierarchical pore size distribution, a turbostratic carbon structure with a high degree graphitization, and about 10% oxygen and nitrogen heteroatoms. A high specific capacitance of 350 Fg(-1) at 0.1 A g(-1) has been achieved in a two-electrode system with 6m KOH; this value is among the highest specific capacitance of biomass-derived carbon materials. More inspiringly, a high energy density of 22.8 Wh kg(-1) at a power density of 198.8 W kg(-1) can be obtained with 1m aqueous solution of Li2SO4, and an ultrahigh energy density of 81.4 Wh kg(-1) at a power density of 446.3W kg(-1) is realized with 1-ethyl-3-methylimidazolium tetrafluoroborate electrolyte.

Original languageEnglish
JournalChemSusChem (Print)
Volume11
Issue10
Pages (from-to)1678-1685
Number of pages8
ISSN1864-5631
DOIs
Publication statusPublished - 25 May 2018

    Research areas

  • biomass, carbon, electrochemistry, mesoporous materials, supercapacitors, VOLUMETRIC PERFORMANCE SUPERCAPACITORS, DOUBLE-LAYER CAPACITORS, NITROGEN-DOPED CARBON, ENERGY-STORAGE, ION BATTERIES, SURFACE-AREA, ELECTRODES, GRAPHENE, BIOMASS, ANODES

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