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Title: Tetra-heteroatom self-doped carbon nanosheets derived from silkworm excrement for high-performance supercapacitors
Authors: Lei, S
Chen, L
Zhou, W
Deng, P
Liu, Y 
Fei, L 
Lu, W 
Xiao, Y
Cheng, B
Keywords: Carbon materials
Silkworm excrement
Issue Date: 2018
Publisher: Elsevier
Source: Journal of power sources, 2018, v. 379, p. 74-83 How to cite?
Journal: Journal of power sources 
Abstract: Carbon materials are deemed to be competitive candidate electrode materials for energy storage systems. It is still a great challenge to explore advanced carbon-based electrode materials for high-performance supercapacitors by a facile, economical and efficient method. In this work, N-, P-, S-, O-self-doped carbon nanosheets with high surface area and well-developed porosity are successfully prepared by pyrolysis carbonization and post KOH activation from silkworm excrement, a novel abundant, low-cost and eco-friendly agricultural waste. Thanks to their unique multi-heteroatom doping and porous structure, the obtained carbon materials exhibit high charge storage capacity with a specific capacitance of 401 F g−1 at a current density of 0.5 A g−1 in 6 M KOH and good cycling stability with a capacitance retention of 93.8% over 10000 cycles. A symmetric supercapacitor device using 1 M Na2SO4 aqueous solution as the electrolyte can deliver a specific capacitance of 41.7 F g−1 at a current density of 0.5 A g−1, and a high energy density of 23.17 Wh kg−1 at a power density of 500 W kg−1 with a wide voltage window of 2.0 V. This work develops a new strategy to produce favorable carbon-based electrode materials for supercapacitors with high electrochemical performances.
ISSN: 0378-7753
EISSN: 1873-2755
DOI: 10.1016/j.jpowsour.2018.01.032
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