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


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.


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



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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