NDLI: Cotton-based porous activated carbon with a large specific surface area as an electrode material for high-performance supercapacitors

Content Provider	Royal Society of Chemistry (RSC)
Author	Guo, Dongyang Yang, Qian Sun, Kanjun Zhou, Xiaozhong Lei, Ziqiang Ma, Guofu Peng, Hui Zhao, Xiaolong
Copyright Year	2015
Abstract	Cotton-based porous activated carbons (CACs) are prepared through a simple chemical activation method using cotton fiber as carbon source and ZnCl2 as activating agent. Powder X-ray diffraction, scanning electron microscopy, and N2 adsorption–desorption tests demonstrate that the carbons activated with different amounts of ZnCl2 have a large number of mesopores, notably, a maximum specific surface area of 2548.6 m2 g−1 and ultrahigh pore volume of 1.54 cm3 g−1 for CAC2 sample are obtained when the cotton/ZnCl2 mass ratio is 1 : 2. As an electrode material for supercapacitors, the CAC2 possesses a high specific capacitance of 239 F g−1 at 0.5 A g−1 and good rate capability (82% capacitance retention even at 8 A g−1) in 2 mol L−1 KOH aqueous electrolyte. Moreover, the as-assembled CAC2//CAC2 symmetric supercapacitor exhibits a high energy density of 13.75 Wh kg−1 at a power density of 225 W kg−1 operated at the voltage range of 0 to 1.8 V in 0.5 mol L−1 Na2SO4 aqueous electrolyte and an excellent cyclability retaining about 93% initial capacitance after 5000 cycles.
Starting Page	64704
Ending Page	64710
Page Count	7
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	5
Issue Number	79
Journal	RSC Advances
DOI	10.1039/c5ra11179j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	X-ray crystallography Electrode Electrolyte KOH Supercapacitor Specific surface area Capacitance Energy density Cotton Carbon Scanning electron microscope
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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