Journal
JOURNAL OF POWER SOURCES
Volume 278, Issue -, Pages 555-561Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2014.12.054
Keywords
Manganese dioxide; Hydrothermal; Self-assembly; Asymmetric supercapacitors
Funding
- National Natural Science Foundation of China [51104194, 51104121]
- National Key laboratory of Fundamental Science of Micro/Nano-device and System Technology (Chongqing University) [2013MS06]
- State Education Ministry and Fundamental Research Funds for the Central Universities (Chongqing University, PR China) [CDJZR14135501, CDJZR13130035]
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Coaxial mesoporous MnO2/amorphous-carbon nanotubes have been synthesized via a facile and costeffective strategy at room temperature. The coaxial double nanotubes of inner (outer) MnO2 and outer (inner) amorphous carbon can be obtained via fine tuning the preparative factors (e.g., deposition order and processing temperature). Furthermore, the electrochemical properties of the coaxial nanotubes were evaluated by cycle voltammetric (CV) and galvanostatic charge-discharge (GC) measurements. The asprepared coaxial double nanotubes of outer MnO2 and inner amorphous carbon exhibit the optimized pseudocapacitance performance (362 F g(-1)) with good cycling stability, and ideal rate capability owning to the unique nanostructures. When assembled into two-electrode asymmetric supercapacitor, an energy density of 22.56W h kg(-1) at a power density of 224.9 W kg(-1) is obtained. These findings provide a new and facile approach to fabricate high-performance electrode for supercapacitors. (C) 2014 Elsevier B.V. All rights reserved.
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