Microwave-assisted in situ synthesis of reduced graphene oxide/Mn3O4 composites for supercapacitor applications
Reduced graphene oxide/Mn 3 O 4 (GM) composites were prepared by a simple and convenient strategy, that is, microwave irradiation of the hydrothermal product of reduced graphene oxide-Mn(NO 3 ) 2 mixtures. Mn 3 O 4 nanoparticles with sizes of 20-50 nm were uniformly distributed on the surface of red...
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Veröffentlicht in: | RSC advances 2015-01, Vol.5 (56), p.4561-4567 |
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Hauptverfasser: | , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Reduced graphene oxide/Mn
3
O
4
(GM) composites were prepared by a simple and convenient strategy, that is, microwave irradiation of the hydrothermal product of reduced graphene oxide-Mn(NO
3
)
2
mixtures. Mn
3
O
4
nanoparticles with sizes of 20-50 nm were uniformly distributed on the surface of reduced graphene oxides. The GM composites exhibited good electrochemical performance with a specific capacitance of 344.8 F g
−1
at the discharge current density of 1 A g
−1
using 5 M NaOH as the electrolyte. The energy density of the GM composites was as high as 47.8 W h kg
−1
with a power density of 1000 W kg
−1
. After 5000 cycles of charge/discharge experiments, a high level retaining specific capacitance of 342.1 F g
−1
was obtained with 99.2% retention of the initial capacitance at 1 A g
−1
and the equivalent series resistance of the GM composites system was much lower than that of pure Mn
3
O
4
. Therefore, the GM composites with large capacitance, good cycling performance and reversibility can be used as a promising electrode material for supercapacitor applications.
Rationally designed reduced graphene oxide/Mn
3
O
4
(GM) was achieved and GM showed long-stability capacitance after 5000 cycles at 1 A g
−1
. |
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ISSN: | 2046-2069 |
DOI: | 10.1039/c5ra05946a |