Journal
RSC ADVANCES
Volume 8, Issue 39, Pages 22146-22153Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ra01988f
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Funding
- National Natural Science Foundation of China [51773171, U1405226]
- 111 Project [B16029]
- Fujian Provincial Department of Science and Technology [2017J06019]
- Natural Science Foundation of Guangdong Province [2015A030310007]
- 1000 Talents Program
- Fundamental Research Funds for the Central Universities [20720160088]
- NUS tear 1 fund [WBS: R-144-000-367-112]
- China Postdoctoral Science Foundation [20130121110018]
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Graphitic nitrogen-doped hierarchical porous carbon nanosheets for supercapacitor application were derived from an easily obtained and green silk by simultaneous ZnCl2 activation and FeCl3 graphitization at different heating temperatures. By increasing the heating temperature from 700 to 850 degrees C, the degree of graphitization and BET surface area rose to their highest levels, while the nitrogen doping content was maintained at 2.24 wt%. Carbonized silk at 850 degrees C displays a nanosheet morphology and a considerable specific surface area (1285.31 m(2) g(-1)), and it was fabricated into a supercapacitor as an electrode material, exhibiting superior electrochemical performance with a high specific capacitance of 178 F g(-1) at 0.5 A g(-1) and an excellent rate capability (81% capacitance retention ratio even at 20 A g(-1)) in 1 mol L-1 H2SO4 electrolyte. A symmetric supercapacitor using carbonized silk at 850 degrees C as the electrodes has an excellent specific energy of 14.33 W h kg(-1) at a power density of 251 W kg(-1) operated over a wide voltage range of 2.0 V in aqueous neutral Na2SO4 electrolyte.
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