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Hierarchical porous carbons with controlled micropores and mesopores for supercapacitor electrode materials
Various porous carbons were prepared by CO 2 activation of ordered mesoporous carbons and used as electrode materials for supercapacitor. The structures were characterized by using X-ray diffraction, transmission electron microscopy and nitrogen sorption at 77 K. The effects of CO 2 treatment on the...
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Published in: | Carbon (New York) 2008-11, Vol.46 (13), p.1718-1726 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Various porous carbons were prepared by CO
2 activation of ordered mesoporous carbons and used as electrode materials for supercapacitor. The structures were characterized by using X-ray diffraction, transmission electron microscopy and nitrogen sorption at 77
K. The effects of CO
2 treatment on their pore structures were discussed. Compared to the pristine mesoporous carbons, the samples subjected to CO
2 treatment exhibited remarkable improvement in textural properties. The electrochemical measurement in 6
M KOH electrolyte showed that CO
2 activation leads to better capacitive performances. The carbon CS15A6, which was obtained after CO
2 treatment for 6
h at 950
°C using CMK-3 as the precursor, showed the best electrochemical behavior with a specific gravimetric capacitance of 223
F/g and volumetric capacitance of 54
F/cm
3 at a scan rate of 2
mV/s and 73% retained ratio at 50
mV/s. The good capacitive behavior of CS15A6 may be attributed to the hierarchical pore structure (abundant micropores and interconnected mesopores with the size of 3–4
nm), high surface area (2749
m
2/g), large pore volume (2.09
cm
3/g), as well as well-balanced microporosity and mesoporosity. |
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ISSN: | 0008-6223 1873-3891 |
DOI: | 10.1016/j.carbon.2008.07.018 |