Journal
NANO LETTERS
Volume 12, Issue 7, Pages 3803-3807Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl301748m
Keywords
Supercapacitor; hybrid electrode; nanotube array; MnO2; electrodeposition
Categories
Funding
- NSFC [51173212, 21073240, 90923008]
- Fundamental Research Fund for the Central Universities [11lgzd14]
- Research Fund for New Star Scientist of Pearl River Science and Technology of Guangzhou [2011J2200057]
- Guangdong Province [9251027501000002, 2011A010802004]
- Open-End Fund of State Key Lab of Physical Chemistry of Solid Surfaces of Xiamen University [201113]
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We demonstrate the design and fabrication of novel nano-architectures of MnO2/Mn/MnO2 sandwich-like nanotube arrays for super-capacitors. The crystalline metal Mn layers in the MnO2/Mn/MnO2 sandwich-like nanotubes uniquely serve as highly conductive cores to support the redox active two-double MnO2 shells with a highly electrolytic accessible surface area and provide reliable electrical connections to MnO2 shells. The maximum specific capacitances of 937 F/g at a scan rate of 5 mV/s by cyclic voltammetry (CV) and 955 F/g at a current density of 1.5 A/g by chronopotentiometry were achieved for the MnO2/Mn/MnO2 sandwich-like nanotube arrays in solution of 1.0 M Na2SO4. The hybrid MnO2/Mn/MnO2 sandwich-like nanotube arrays exhibited an excellent rate capability with a high specific energy of 45 Wh/kg and specific power of 23 kW/kg and excellent long-term cycling stability (less 5% loss of the maximum specific capacitance after 3000 cycles). The high specific capacitance and charge-discharge rates offered by such MnO2/Mn/MnO2 sandwich-like nanotube arrays make them promising candidates for supercapacitor electrodes, combining high-energy densities with high levels of power delivery.
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