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

Manganese oxide (MnO 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 2 domains into continuously interconnecte...

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Bibliographic Details
Published in:Communications chemistry 2018-04, Vol.1 (1), Article 16
Main Authors: Gong, Wei, Fugetsu, Bunshi, Wang, Zhipeng, Sakata, Ichiro, Su, Lei, Zhang, Xueji, Ogata, Hironori, Li, Mingda, Wang, Chao, Li, Ju, Ortiz-Medina, Josue, Terrones, Mauricio, Endo, Morinobu
Format: Article
Language:English
Subjects:
639/301/299/161/891
639/4077/4079/4105
639/638/298
639/925/357/73
Aqueous solutions
Brittleness
Carbon
Carbon nanotubes
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Domains
Electrical resistivity
Electrodes
Energy harvesting
Energy storage
Hybrid systems
Manganese dioxide
Manganese oxides
Nanostructure
Nickel
Sodium sulfate
Supercapacitors
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Summary:Manganese oxide (MnO 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 2 domains into continuously interconnected carbon nanotube (CNT) networks, thus imparting both electrical conductivity and mechanical durability to MnO 2 . In particular, we synthesize a fiber-shaped coaxial electrode with a nickel fiber as the current collector (Ni/CNT/MnO 2 ); the thickness of the CNT/MnO 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 2 coaxial electrodes as cathode and anode together with a 1.0 M Na 2 SO 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. Manganese dioxide is a promising material for energy storage applications, but is limited by its brittleness and poor conductivity. Here, manganese dioxide domains are electrochemically deposited onto carbon nanotube networks to produce flexible and conductive hybrid fiber-shaped supercapacitors.
ISSN:2399-3669
2399-3669
DOI:10.1038/s42004-018-0017-z