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Influence of surface roughening of Titanium substrate in the electrochemical activity of Manganese oxide thin film electrode in anodic oxidation of dye-containing solutions

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Abstract

Previous work has verified the possibility to obtain mechanically, chemically and electrically stable electrodes based on manganese oxide (MnOx) thin films for anodic oxidation of solutions containing the Reactive Violet 5 (RV5) azo dye. To improve the morphological and electrochemical properties of these materials, in this study, a surface modification of the titanium support has been presented. Chemically modified surfaces were obtained by etching titanium substrates in hydrocloridric acid at high temperature. Untreated and modified electrodes were coated sequentially with a RuOx film, as interlayer and a MnOx film obtained by adopting three different techniques including anodic electrodeposition, cathodic electrodeposition and thermal decomposition. Surface morphology, topography and composition of all the electrodes were investigated by profilometric and TOF–SIMS analysis. The electrochemical activity of anodes were first determined by cyclic voltammetry, and then in the treatment of solutions containing the RV5 azo dye, as model pollutant, in undivided cell under galvanostatic conditions. The results show that the surface microstructure modifies substantially the electrochemical response of selected electrodes.

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Acknowledgments

L.T. gratefully acknowledges Fondazione Roma and INFN for financial support.

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Authors and Affiliations

  1. Department of Engineering, University of Rome 3, Via Vito Volterra, 62, 00146, Rome, Italy

    Giovanni Sotgiu

  2. Department of Mathematics and Physics, University of Rome 3, Via della Vasca Navale, 84, 00146, Rome, Italy

    Luca Tortora

  3. Department of Chemical Engineering Materials & Environment, Sapienza University of Rome, Via Eudossiana,18, 00184, Rome, Italy

    Elisabetta Petrucci

Authors
  1. Giovanni Sotgiu
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  2. Luca Tortora
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  3. Elisabetta Petrucci
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Correspondence to Elisabetta Petrucci.

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Sotgiu, G., Tortora, L. & Petrucci, E. Influence of surface roughening of Titanium substrate in the electrochemical activity of Manganese oxide thin film electrode in anodic oxidation of dye-containing solutions. J Appl Electrochem 45, 787–797 (2015). https://doi.org/10.1007/s10800-015-0827-y

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  • DOI: https://doi.org/10.1007/s10800-015-0827-y

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