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2D nitrogen-doped porous carbon nanosheets derived from cellulose nanofiber/silk fibroin nanohybrid cellular monoliths with promising capacitive performance

  • Kezheng Gao
  • Shuyan Zhao
  • Qingyuan NiuEmail author
  • Lizhen WangEmail author
Original Research


2D nitrogen-doped porous carbon nanosheets are prepared from cellulose nanofiber/silk fibroin nanohybrid cellular monoliths via unidirectional freeze-shaping technique, carbonization, and CO2 activation processes. The micromorphology of the cellulose nanofiber/silk fibroin nanohybrid cellular monoliths can be effectively controlled by simply changing the content of silk fibroin. The 2D nitrogen-doped porous carbon nanosheets (NPCN-X, X represents the content of silk fibroin), inherited from different cellular monolith, show a distinct micromorphology. The NPCN-50 exhibits the best electrochemical performance due to its 2D nanostructure, abundant multi-scale through pores, high specific surface area (about 1882 m2 g−1), and appropriate surface N/O-doping. The largest gravimetric capacitance value is about 329.9 F g−1 at a current density of 0.25 A g−1. The energy density reaches as high as 37.5 Wh kg−1 at a power density of 186.3 W kg−1. The NPCN-50 also exhibits excellent electrochemical cycling stability.

Graphic abstract


2D porous carbon nanosheets Nitrogen-doped Cellulose nanofiber Silk fibroin Cellular monoliths 



Financial support was kindly supplied by grants from National Natural Science Foundation of China (Nos. 21601162, 21501154, 21471135).

Supplementary material

10570_2019_2723_MOESM1_ESM.docx (13.7 mb)
Supplementary material 1 (DOCX 14039 kb)


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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.School of Material and Chemical EngineeringZhengzhou University of Light IndustryZhengzhouChina

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