Journal
ELECTROCHIMICA ACTA
Volume 133, Issue -, Pages 254-261Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.04.001
Keywords
Manganese dioxide; Carbon nanotubes; MnO2/CNT nanocomposites; Zinc ion storage; Rechargeable zinc ion battery
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Funding
- Natural Science Foundation of China [U1330123, 51232005]
- Shenzen Projects for Basic research [JC201005270288A, JC201005310705A]
- Guangdong Province Innovation R&D Team Plan for Energy and Environmental Materials [2009010025]
- National Key Basic research Program of China [2014CB932400]
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The rod-like manganese dioxide (MnO2)/acid-treated carbon nanotube (a-CNT) nanocomposites have been synthesized by a simple co-precipitation method. The MnO2 nanorod with the diameter of about 10 nm and length of 50 similar to 120nm is in-situ deposited on the surface of acid-treated CNT through the redox reaction of KMnO4 and Mn(CH3COO)(2)center dot 4H(2)O. Results show that the electron transfer efficiency of the MnO2/a-CNT nanocomposites is greatly enhanced and results in a high electrical conductivity. The energy storage mechanism of as-prepared MnO2/a-CNT in mild aqueous electrolyte (ZnSO4 and MnSO4) is associated with the insertion/extraction of zinc ion into/from the tunnels of crystalline alpha-MnO2. The composites display both excellent storage properties with zinc ions (similar to 400 mAh.g(-1) at A.g(-1)) and reversibility at various current rates (similar to 100% coulombic efficiency after 500 charge/discharge cycles). The MnO2/a-CNT nanocomposites are rather promising cathode material for high performance rechargeable zinc ion batteries. (C) 2014 Elsevier Ltd. All rights reserved.
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