Journal
JOURNAL OF NANOPARTICLE RESEARCH
Volume 12, Issue 7, Pages 2349-2353Publisher
SPRINGER
DOI: 10.1007/s11051-010-9980-8
Keywords
Manganese oxide; Carbon nanotube; Hydrothermal synthesis; Nanocomposite; Supercapacitor
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Funding
- Shanghai Pujiang Program [07PJ14005]
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The partial coverage of manganese oxide (MnO2) particles was achieved on the surfaces of multi-walled carbon nanotubes (MWCNTs) through a facile hydrothermal process. These particles were demonstrated to be alpha-manganese dioxide (alpha-MnO2) nanocrystallites, and exhibited the appearance of the whisker-shaped crystals with the length of 80-100 nm. In such a configuration, the uncovered CNTs in the nanocomposite acted as a good conductive pathway and the whisker-shaped MnO2 nanocrystallites efficiently increased the contact of the electrolyte with the active materials. Thus, the highest specific capacitance of 550 F g(-1) was achieved using the resulting nanocomposites as the supercapacitor electrode. In addition, the enhancement of the capacity retention was observed, with the nanocomposite losing only 10% of the maximum capacity after 1,500 cycles.
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