Manganese Oxide/Single-Walls Carbon Nanotubes Electrodeposited Films for Supercapacitors

Fang Xiao

doi:10.4028/www.scientific.net/KEM.744.354

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 744Manganese Oxide/Single-Walls Carbon Nanotubes...

Manganese Oxide/Single-Walls Carbon Nanotubes Electrodeposited Films for Supercapacitors

Abstract:

The manganese oxide/single-walls carbon nanotubes (SWNTs) composite films were co-deposited by the potentiodynamic method via octylphenyl polyoxyethylene ether (OP-10) mediation the growth rate of electrolysis MnO₂. Octylphenyl polyoxyethylene ether (OP-10) was used to obtain SWNTs suspensions through noncovalent functionalizition. At the fixed OP-10 concentration of 0.075 mol L^-1, specific capacitance (SC) of the composites raised with SWNTs concentration increased and reached a maximum at SWNT concentration of 0.75 g L^-1 due to porous microstructure and good electronic conductivity of SWNTs. Moreover, appropriated OP-10 concentration benefited to not only stable SWNTs suspension but also modified MnO₂ electrodeposited process for the uniform distribution of nanotubes in the composites. The microstructure and electrochemical characteristics of MnO₂/SWNTs composite films were affected by the SWNTs content. The supercapacitor performances of MnO₂ as the ratio of SWNTs optimized were significantly improved for the electronic and ionic transport in this film should be more balance. According to electrochemical impedance spectrum, the optimal MnO₂/SWNTs composite presented low charge-transfer resistance and good frequency response. The MnO₂/SWNTs composite showed the maximum SC of 421 F g^-1, which was four times higher than the pure MnO₂, at the current of 1 A g^-1. This MnO₂/SWNTs composite is a promising active material for high energy density and high power density supercapacitors.

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Key Engineering Materials (Volume 744)

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354-358

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.744.354

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Online since:

July 2017

Authors:

Fang Xiao*

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Electrode Material, Nanomaterial, Supercapacitor

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