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Buckwheat husk-derived hierarchical porous nitrogen-doped carbon materials for high-performance symmetric supercapacitor

  • Lulu Qiang
  • Zhongai HuEmail author
  • Zhimin Li
  • Yuying Yang
  • Xiaotong Wang
  • Yi Zhou
  • Xinyuan Zhang
  • Wenbin Wang
  • Qian Wang
Article
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Abstract

A facile one-step strategy is established to prepare nitrogen doped three-dimensional (3D) hierarchical porous carbon from buckwheat husk, in which the synchronous activation and nitrogen-doping is fulfilled via using KOH and urea. The obtained sample (BSCN-700) possesses an ultrahigh specific surface area of 2794.5 m2 g−1 with a unique carbon frame. The electrochemical measurements indicate that the resultant BSCN-700 exhibits a high specific capacitance of 326 F g−1 at current density of 1 A g−1, with good rate capability (78.4% capacitance retention at 100 A g−1) in 6 M KOH electrolyte. Furthermore, the as-prepared sample was used to assemble a symmetric supercapacitor filled with 6 M KOH electrolyte. As a result, the BSCN-700 symmetric supercapacitor displays a high energy density of 20.4 Wh kg−1 at a power density of 699 W kg−1 and good cycling stability which retains 95% of the initial capacitance at 5 A g−1 after 5000 cycles.

Keywords

Symmetric supercapacitor Buckwheat husk Nitrogen-doping Hierarchical porous carbon High rate capability 
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Notes

Acknowledgements

The authors gratefully acknowledge the financial support offered by the National Natural Science Foundation of China (20963009, 21163017, 21563027, and 21773187).

Supplementary material

10934_2019_723_MOESM1_ESM.docx (803 kb)
Supporting Information is available from the Wiley Online Library or from the author. Supplementary material 1 (DOCX 803 KB)

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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Key Laboratory of Eco-Environment-Related Polymer Materials of Ministry of Education, Key Laboratory of Polymer Materials of Gansu Province, College of Chemistry and Chemical EngineeringNorthwest Normal UniversityLanzhouChina

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