A mild method to prepare nitrogen-rich interlaced porous carbon nanosheets for high-performance supercapacitors.

Journal of Colloid and Interface Science
Jiewei YangYong Xiao

Abstract

In this work, a non-toxic and mild strategy was presented to efficiently fabricate porous and nitrogen-doped carbon nanosheets. Silkworm cocoon (SCs) acted as carbon source and original nitrogen source. Sodium carbonate (Na2CO3) could facilitate the SCs to expose silk protein and played a catalytic role in the subsequent activation of calcium chloride (CaCl2). Calcium chloride served as pore-making agent. The as-obtained carbon materials with protuberant porous nanosheets exhibit high specific surface area of 731 m2 g-1, rich native nitrogen-doped of 7.91 atomic %, wide pore size distribution from 0.5 to 65 nm, and thus possessing high areal specific capacitances of 34 μF cm-2 as well as excellent retention rate of 97% after 20 000 cycles at a current density of 20 A g-1 in 6 M KOH electrolyte. The assembled carbon nanosheet-based supercapacitor displays a maximum energy density of 21.06 Wh kg-1 at the power density of 225 W kg-1 in 1 M Na2SO4 electrolyte. Experimental results show that a mild and non-toxic treatment of biomass can be an effective and extensible method for preparing optimal porous carbon for electrochemical energy storage.

References

Nov 26, 2013·Materials Science & Engineering. C, Materials for Biological Applications·Jun-Ting WangQing Shen
Mar 5, 2015·ACS Applied Materials & Interfaces·Ji-Shi WeiHuan-Ming Xiong
May 26, 2016·ACS Applied Materials & Interfaces·Yuxiang HuangGuihua Yu
Apr 4, 2018·Journal of Colloid and Interface Science·Cunjing WangKai Jiang
Jan 12, 2019·Journal of Colloid and Interface Science·Lijie HouShanshan Li
Nov 5, 2020·Journal of Colloid and Interface Science·Zhixiang TanYong Xiao

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