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Electrochemical properties of graphene nanosheets/polyaniline nanofibers composites as electrode for supercapacitors
► Graphene nanosheets/polyaniline nanofibers composites are synthesized in HClO 4. ► The composites effectively enhance the kinetic for charge transfer and ion transport. ► A remarkable specific capacitance of 1130 F g −1 is observed for the composite. ► The mass ratios of graphene and polyaniline a...
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Published in: | Journal of power sources 2011-12, Vol.196 (24), p.10775-10781 |
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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: | ► Graphene nanosheets/polyaniline nanofibers composites are synthesized in HClO
4. ► The composites effectively enhance the kinetic for charge transfer and ion transport. ► A remarkable specific capacitance of 1130
F
g
−1 is observed for the composite. ► The mass ratios of graphene and polyaniline affect the electrochemical performances.
Graphene nanosheets/polyaniline nanofibers (GNS/PANI) composites are synthesized via in situ polymerization of aniline monomer in HClO
4 solution. The PANI nanofibers homogeneously coating on the surface of GNS greatly improve the charge transfer reaction. The GNS/PANI composites exhibit better electrochemical performances than the pure individual components. A remarkable specific capacitance of 1130
F
g
−1 (based on GNS/PANI composites) is obtained at a scan rate of 5
mV
s
−1 in 1
M H
2SO
4 solution compared to 402
F
g
−1 for pure PANI and 270
F
g
−1 for GNS. The excellent performance is not only due to the GNS which can provide good electrical conductivity and high specific surface area, but also associate with a good redox activity of ordered PANI nanofibers. Moreover, the GNS/PANI composites present excellent long cycle life with 87% specific capacitance retained after 1000 charge/discharge processes. The resulting composites are promising electrode materials for high-performance electrical energy storage devices. |
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ISSN: | 0378-7753 1873-2755 |
DOI: | 10.1016/j.jpowsour.2011.08.105 |