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Modified carbon fabric electrodes: preparation and electrochemical behavior toward amaranth electrolysis

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Abstract

The electrochemical behavior of non-modified, Pt-modified, and Pt/polyaniline-modified carbon fiber textile electrodes was studied through a series of electrolyses, under potentiostatic conditions, on an amaranth/sulfuric solution in the presence or absence of chloride ion. The morphology of the dispersed Pt, PANI, and PANI/Pt coatings was analyzed by scanning electron microscopy. Scanning electrochemical microscopy confirmed that the textile surface was effectively modified by the electrocatalytic material. Color removal reached values above 90 % in both electroreduction and electrooxidation processes. The amaranth electroreductions carried out with the non-modified electrode showed better charge efficiency than those with the Pt-modified textile electrode. The electrooxidations with Pt-modified textile electrodes showed a significant reduction in electrolysis time. Ultraviolet–visible and Fourier transform infrared with attenuated total reflection spectra enabled the electrochemical behavior of the non-modified and Pt/PANI-modified electrodes to be distinguished.

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Acknowledgments

The authors wish to acknowledge to the Spanish Ministerio de Ciencia e Innovación (contract CTM2011-23583) and Universitat Politècnica de València (Vicerrectorado de Investigación PAID-06-10 contract 003-233) for the financial support; and as well as Carbongen S. A. (Cocentaina, Spain), who kindly donated the activated carbon fabric. J. Molina is grateful to the Conselleria d’Educació, Formació i Ocupació (Generalitat Valenciana) for the Programa VALi+D Postdoctoral Fellowship. A.I. del Río is grateful to the Spanish Ministerio de Ciencia y Tecnología for the FPI fellowship.

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Authors and Affiliations

  1. Departamento de Ingeniería Textil y Papelera, Escuela Politécnica Superior de Alcoy, Universitat Politècnica de València, Plaza Ferrándiz y Carbonell, s/n, 03801, Alcoy, Spain

    J. Fernández, A. I. del Río, J. Molina, J. Bonastre & F. Cases

  2. Department of Textile Engineering, University of Minho, Campus de Azurém, 4800-058, Guimarães, Portugal

    J. Molina

Authors
  1. J. Fernández
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  2. A. I. del Río
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  3. J. Molina
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  4. J. Bonastre
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  5. F. Cases
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Correspondence to F. Cases.

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Fernández, J., del Río, A.I., Molina, J. et al. Modified carbon fabric electrodes: preparation and electrochemical behavior toward amaranth electrolysis. J Appl Electrochem 45, 263–272 (2015). https://doi.org/10.1007/s10800-014-0769-9

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  • DOI: https://doi.org/10.1007/s10800-014-0769-9

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