Title

Synthesis and electrochemical performance of multi-walled carbon nanotube/polyaniline/MnO2 ternary coaxial nanostructures for supercapacitors

Authors

Authors

Q. A. Li; J. H. Liu; J. H. Zou; A. Chunder; Y. Q. Chen;L. Zhai

Comments

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Abbreviated Journal Title

J. Power Sources

Keywords

Carbon nanotube; Polyaniline; Manganese oxide; Coaxial; Supercapacitor; CHARGE-STORAGE PROPERTIES; REDOX SUPERCAPACITORS; COMPOSITE ELECTRODES; ENERGY-STORAGE; HIGH-POWER; POLYANILINE; CAPACITORS; POLYPYRROLE; NANOTUBES; DEPOSITION; Electrochemistry; Energy & Fuels

Abstract

Multi-walled carbon nanotube (MWCNT)/polyaniline (PANI)/MnO2 (MPM) ternary coaxial structures are fabricated as supercapacitor electrodes via a simple wet chemical method. The electrostatic interaction between negative poly(4-styrenesulfonic acid) (PSS) molecules and positive Mn2+ ions causes the generation of MnO2 nanostructures on MWCNT surfaces while the introduction of PANI layers with appropriate thickness on MWCNT surfaces facilitates the formation of MWCNT/PANI/MnO2 ternary coaxial structures. The thickness of PANI coatings is controlled by tuning the aniline/MWCNT ratio. The effect of PANI thickness on the subsequent MnO2 nanoflakes attachment onto MWCNTs, and the MPM structures is investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and field-emission scanning electron microscopy (FESEM). The results suggest that appropriate thickness of PANI layers is important for building MPM ternary coaxial structures without the agglomeration of MnO2 nanoflakes. The MPM ternary coaxial structures provide large interaction area between the MnO2 nanoflakes and electrolyte, and improve the electrochemical utilization of the hydrous MnO2, and decrease the contact resistance between MnO2 and PANI layer coated MWCNTs, leading to intriguing electrochemical properties for the applications in supercapacitors such as a specific capacitance of 330 Fg(-1) and good cycle stability. Published by Elsevier B.V.

Journal Title

Journal of Power Sources

Volume

196

Issue/Number

1

Publication Date

1-1-2011

Document Type

Article

Language

English

First Page

565

Last Page

572

WOS Identifier

WOS:000282493100073

ISSN

0378-7753

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