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Photocatalysis and photoelectrocatalysis using nanocrystalline titania alone or combined with Pt, RuO2 or NiO co-catalysts

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Abstract

Photocatalytic mineralization of ethanol in the presence of oxygen has been studied in aqueous photocatalyst suspensions by employing either pure nanocrystalline titania or TiO2 combined with Pt, RuO2 or NiO co-catalysts. Combined photocatalysts demonstrated a diverse behavior. Highest mineralization rates were obtained with Pt/TiO2 and lowest with RuO2/TiO2 and NiO/TiO2. These results were related with the photocatalysts’ behavior when used as photoanodes for the production of electricity in a photoactivated fuel cell running with ethanol as fuel. The highest current was obtained with pure titania. The current dropped in the case of Pt/TiO2 and became much lower in the case of RuO2/TiO2 and NiO/TiO2 photoanodes. Both current and voltage were lower in the presence of oxygen than in its absence. It is concluded that the presence of electron scavengers, like O2, and/or the use of efficient photocatalysts, like titania-supported Pt, yield less electric power but assist ethanol mineralization process.

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Acknowledgments

This research has been co-financed by the European Union (European Social Fund—ESF) and Greek national funds through the Operational Program “Education and Lifelong Learning” of the National Strategic Reference Framework (NSRF)—Research Funding Program: Heracleitus II. Investing in knowledge society through the European Social Fund.

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Authors and Affiliations

  1. Engineering Science Department, University of Patras, 26500, Patras, Greece

    Maria Antoniadou & Panagiotis Lianos

  2. Department of Chemical Engineering, University of Patras, 26500, Patras, Greece

    Paraskevi Panagiotopoulou & Dimitris I. Kondarides

  3. FORTH/ICE-HT, P.O. Box 1414, 26504, Patras, Greece

    Panagiotis Lianos

Authors
  1. Maria Antoniadou
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  2. Paraskevi Panagiotopoulou
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  3. Dimitris I. Kondarides
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  4. Panagiotis Lianos
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Corresponding authors

Correspondence to Dimitris I. Kondarides or Panagiotis Lianos.

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Antoniadou, M., Panagiotopoulou, P., Kondarides, D.I. et al. Photocatalysis and photoelectrocatalysis using nanocrystalline titania alone or combined with Pt, RuO2 or NiO co-catalysts. J Appl Electrochem 42, 737–743 (2012). https://doi.org/10.1007/s10800-012-0408-2

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  • DOI: https://doi.org/10.1007/s10800-012-0408-2

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