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Carbon nanotubes and manganese oxide hybrid nanostructures as high performance fiber supercapacitors

Author(s)
Terrones, Mauricio
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Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/
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Abstract
Manganese oxide (MnO [subscript]2) has long been investigated as a pseudo-capacitive material for fabricating fiber-shaped supercapacitors but its poor electrical conductivity and its brittleness are clear drawbacks. Here we electrochemically insert nanostructured MnO [subscript]2 domains into continuously interconnected carbon nanotube (CNT) networks, thus imparting both electrical conductivity and mechanical durability to MnO [subcript]2. In particular, we synthesize a fiber-shaped coaxial electrode with a nickel fiber as the current collector (Ni/CNT/MnO [subscript]2); the thickness of the CNT/MnO [subscript]2 hybrid nanostructured shell is approximately 150 μm and the electrode displays specific capacitances of 231 mF cm−1. When assembling symmetric devices featuring Ni/CNT/MnO [subscript]2 coaxial electrodes as cathode and anode together with a 1.0 M Na [subscript]2 SO [subscript]4 aqueous solution as electrolyte, we find energy densities of 10.97 μWh cm−1. These values indicate that our hybrid systems have clear potential as wearable energy storage and harvesting devices.
Date issued
2018-04
URI
https://hdl.handle.net/1721.1/124297
Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering; Massachusetts Institute of Technology. Department of Materials Science and Engineering
Journal
Communications Chemistry
Publisher
Springer Nature
Citation
Gong, W., et al., "Carbon nanotubes and manganese oxide hybrid nanostructures as high performance fiber supercapacitors." Communications Chemistry 1 (2018): no. 16 doi: 10.1038/s42004-018-0017-z ©2018 Author(s)
Version: Final published version

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