Journal
JOURNAL OF MATERIALS SCIENCE
Volume 53, Issue 20, Pages 14536-14547Publisher
SPRINGER
DOI: 10.1007/s10853-018-2630-8
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Funding
- National Natural Science Foundation of China [21461014]
- Project for Young Scientist Training of Jiangxi Province [20153BCB23022]
- Natural Science Foundation of Jiangxi Province [20151BAB206016]
- Innovation Fund Designated for Graduate Students of Nanchang University [CX2016019]
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Carbon represents one of the most prominent materials for energy applications. It is always desirable to achieve high value-added carbon materials from biomass wastes. Herein, the advanced carbon materials with multi-heteroatom-doping, high surface area and hierarchical porosity are prepared by hydrothermal conversion and post-activation of silkworm excrement, an agricultural waste. Owing to their unique composition and porosity, the carbon networks show a specific capacitance as high as 412 F g(-1) in 6M KOH electrolyte at a current density of 0.5 A g(-1). The symmetric supercapacitor device can deliver a high energy density up to 28.78 Wh kg(-1) at a power density of 300 W kg(-1) with a wide voltage window of 2.0 V in 1M Na2SO4 aqueous electrolyte. It also exhibits superb cycling stability with a capacitance retention of 92.9% for 10000 cycles. This work demonstrates a facile and eco-friendly strategy to transform biomass wastes into superior carbon electrode materials for high-performance supercapacitors.
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