Abstract
Composites of functionalized single-wall carbon nanotubes and polyaniline are deposited onto electrodes by in situ electrochemical polymerization. Their electrochemical behavior and differential capacitance are studied by cyclic voltammetry, electrochemical impedance spectroscopy, and chronovoltamperometry. The differential capacitance of the composite electrode exceeds that of pure polyaniline film deposited onto electrode, which can be explained by the nanotubes’ loosening effect on the polyaniline structure. The composite-electrode capacitance is as large as 1000 F g−1 or higher. Thus obtained composite films were used as a support for deposited platinum-ruthenium catalyst. The Pt-Ru structure and catalytic properties in the methanol oxidation reaction are studied. It is shown that the specific current of methanol oxidation at Pt-Ru is larger by a factor of 7–15 than those measured when pure polyaniline, pure carbon nanotubes, or standard Vulcan XC-72 carbon black are used as supports. It is found that the catalytic activity is the same for all studied supports, provided the current is reduced to the unit of Pt-Ru true surface area. Thus, the observed large catalytic effect is associated with the structure and high dispersivity of the electrodeposited metals incorporated to the single-wall carbon nanotubes-polyaniline composite.
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Original Russian Text © A.A. Mikhaylova, E.K. Tusseeva, A.Yu. Rychagov, Yu.M. Vol’fkovich, A.V. Krestinin, O.A. Khazova, 2010, published in Elektrokhimiya, 2010, Vol. 46, No. 11, pp. 1368–1376.
The paper was prepared for a special issue dedicated to the birth centenary of Ya.M. Kolotyrkin.
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Mikhaylova, A.A., Tusseeva, E.K., Rychagov, A.Y. et al. The carbon nanotubes-polyaniline composites and their effect on catalytic properties of deposited catalysts. Russ J Electrochem 46, 1280–1288 (2010). https://doi.org/10.1134/S102319351011008X
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DOI: https://doi.org/10.1134/S102319351011008X