Hierarchical porous biomass carbon derived from cypress coats for high energy supercapacitors

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


In the present work, we report a simple two-step process to fabricate hierarchical porous carbon from biomass. The so-called two-step refers to hydrothermal carbonization of cypress coats followed by activation with KOH. The morphology and porous parameters of the resulting porous carbon can be controlled by adjusting KOH/carbon mass ratio during activating stage. The optimal sample (SHPC-2) has a hierarchically porous structure containing micropores and meso-/macropores, high specific surface areas (1325.9 m2 g− 1) with appropriate pore size and hydrophilous surface properties due to rich nitrogen and oxygen co-doping. The electrochemical measurements show the as-prepared SHPC-2 exhibits a high specific capacitance (345 and 330 F g− 1 at 1.0 A g− 1) and better rate capability (75.4% and 87.8% capacitance retention at 50 A g− 1) in 1 M H2SO4 and 6 M KOH, respectively. Furthermore, the assembled symmetric supercapacitor based on SHPC-2 and filled with 1 M Na2SO4 electrolyte delivers an outstanding energy storage performance (energy density of 30.5 W h kg− 1 at power density 900 W kg− 1) with good cycling stability (86.2% retention after 10000 cycles at 5 A g− 1). These results indicate that the eco-friendly carbon materials derived from biomass have a huge potential in the applications of high-performance electrode materials for supercapacitors.



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


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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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