Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 24, Issue 24, Pages 3815-3826Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201304206
Keywords
supercapacitors; Li-ion batteries; herarchical structures; three-dimensional; metal oxides
Categories
Funding
- 973 Program [2013CB632701]
- National Natural Science Foundation of China [51202163]
- Shanghai Pujiang Program [12PJ1408200]
- Innovation Program of Shanghai Municipal Education Commission [13ZZ025]
- Doctor Programs Foundation of MOE [20120072120044]
- Fundamental Research Fund for Central University
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In this paper, a highly ordered three-dimensional Co3O4@MnO2 hierarchical porous nanoneedle array on nickel foam is fabricated by a facile, stepwise hydrothermal approach. The morphologies evolution of Co3O4 and Co3O4@MnO2 nanostructures upon reaction times and growth temperature are investigated in detail. Moreover, the as-prepared Co3O4@MnO2 hierarchical structures are investigated as anodes for both supercapacitors and Li-ion batteries. When used for supercapacitors, excellent electrochemical performances such as high specific capacitances of 932.8 F g-1 at a scan rate of 10 mV s-1 and 1693.2 F g-1 at a current density of 1 A g-1 as well as long-term cycling stability and high energy density (66.2 W h kg-1 at a power density of 0.25 kW kg-1), which are better than that of the individual component of Co3O4 nanoneedles and MnO2 nanosheets, are obtained. The Co3O4@MnO2 NAs are also tested as anode material for LIBs for the first time, which presents an improved performance with high reversible capacity of 1060 mA h g-1 at a rate of 120 mA g-1, good cycling stability, and rate capability.
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