MnO2/Poly(3,4-ethylenedioxythiophene) Coaxial Nanowires by One-Step Coelectrodeposition for Electrochemical Energy Storage

We introduce a simple one-step method to synthesize MnO2/poly(3,4-ethylenedioxythiophene) coaxial nanowires by coelectrodeposition in a porous alumina template.6

Ran Liu; Sang Bok Lee

2008

Scholarcy highlights

  • In this paper, we introduce a simple one-step method to synthesize MnO2/poly(3,4-ethylenedioxythiophene) coaxial nanowires by coelectrodeposition in a porous alumina template. MnO2 is one of the most popular electrochemical energy storage materials because of its high energy density, low cost, environmental friendliness, and natural abundance, but it has poor conductivity.4c PEDOT has merits of excellent conductivity, high stability, and mechanical flexibility, but it provides low electrochemical energy density
  • Scheme 1 illustrates the growth of MnO2/PEDOT coaxial nanowires
  • Since the onset growth potential of MnO2 is lower than that of PEDOT, MnO2 nanowires can be selectively grown below 0.6 V, while PEDOT nanowires are grown at the potentials above 0.85 V due to the higher growth rate of PEDOT given that the concentration of EDOT monomer is 8 times that of Mn2+
  • After the MnO2 cores in these coaxial nanowires are selectively removed by wet etching, PEDOT nanotubes with different wall thicknesses are obtained and clearly observed by TEM
  • We have previously proved that the sputtered ring-shape Au electrodes at the bottom of the pores can direct the growth of PEDOT nanotubes at low overpotential
  • The synthetic method presented here will be further investigated for the extension to fabricating other heterogeneous 1D nanocomposite structure with other metal oxides and conductive polymers, which may lead to new types of materials in electrochemical energy storage devices
  • Supporting Information Available: Electron diffraction pattern and energy dispersive X-ray spectroscopic line-scan, TEM of PEDOT nanotubes, phase segregation, SEM

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