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Issue 27, 2017, Issue in Progress
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N-Doped hierarchical porous carbon from waste boat-fruited sterculia seed for high performance supercapacitors

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Abstract

N-Doped hierarchical porous carbon (NHPC) was obtained from waste boat-fruited sterculia seed by hydrothermal carbonization and KOH activation. The influence factors including the ratio of activation agent to precursor, activation temperature, and heteroatom-doping were discussed. The results showed that the NHPC-800-1 activated at 800 °C with the ratio of activation agent to precursor being 1 as an electrode in an electrical double layer capacitor (EDLC) exhibited the best electrochemical performance in 6 M KOH electrolyte. It delivered the specific capacitance up to 337 F g−1 at a current density of 1 A g−1, and still retained a capacitance of 181.5 F g−1 at the high current density of 50 A g−1. This material also shows an excellent capacitance retention of 98.8% after 5000 cycles at a current density of 20 A g−1. In addition, a symmetric supercapacitor fabricated by NHPC-800-1 released an energy density of 8.05 W h kg−1 at a power density of 10 kW kg−1, and a high cycling stability with a capacitance retention of 98.5% over 10 000 cycles at 20 A g−1 in 6 M KOH electrolyte. The superior performance of NHPC-800-1 could be attributed to these advantages of hierarchical porous structure, narrow micropore size distribution and rational micro/mesopore ratio, as well as the doping of the N atoms. These very attractive electrochemical properties indicate that the NHPC-800-1 derived from boat-fruited sterculia is a promising electrode material for supercapacitors.

Graphical abstract: N-Doped hierarchical porous carbon from waste boat-fruited sterculia seed for high performance supercapacitors

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Publication details

The article was received on 24 Jan 2017, accepted on 06 Mar 2017 and first published on 15 Mar 2017


Article type: Paper
DOI: 10.1039/C7RA01043E
RSC Adv., 2017,7, 16678-16687
  • Open access: Creative Commons BY license
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    N-Doped hierarchical porous carbon from waste boat-fruited sterculia seed for high performance supercapacitors

    W. Wang, H. Quan, W. Gao, R. Zou, D. Chen, Y. Dong and L. Guo, RSC Adv., 2017, 7, 16678
    DOI: 10.1039/C7RA01043E

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