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Electrocatalytic oxidation of ethanol on Pt–Mo bimetallic electrodes in acid medium

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Abstract

Pt–Mo alloy electrocatalysts were prepared by an arc-melting furnace process to investigate the origin of their enhanced activity toward ethanol oxidation. Two Mo contents were chosen in zones of the binary phase diagram where they are supposed to form either a pure alloy mixture or a solid solution. Pt–Mo alloy catalysts were more active than Pt-alone. Gradual Mo dissolution at the electrode surface was observed after voltammetric and chronoamperometric measurements. The dissolved Mo contributed to the catalytic effect of the electrode as underpotentially deposited (upd) adatoms. This dissolution probably also leads to an increase in the electrode surface roughness. Low molybdenum content in the electrode material enhances the activity toward ethanol oxidation when compared to Pt-alone. Ethanol oxidation was also investigated by in situ infrared reflectance spectroscopy in order to determine the presence of adsorbed intermediates like CO species. Acetaldehyde, acetic acid and CO2 were also found by spectroscopic experiments.

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Acknowledgements

This work was mainly conducted within under the framework of a collaborative programme CAPES/COFECUB (Comité Français d’Evaluation de la Coopération Universitaire avec le Brésil) under grant no 498/05. D. M. dos Anjos thanks CAPES for the Ph-D fellowship. G. Tremiliosi-Filho, P. Olivi and A.R de Andrade acknowledge FAPESP and CNPq for financial support. The authors also acknowledge Roberto B. de Lima for his help in FTIR studies.

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Authors and Affiliations

  1. Equipe Electrocatalyse, UMR 6503, CNRS - Université de Poitiers - 40, Avenue du Recteur Pineau, 86022, Poitiers Cedex, France

    D. M. dos Anjos, K. B. Kokoh & J.M. Léger

  2. Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, 14040-901, Ribeirão Preto, SP, Brazil

    A.R. DE Andrade & P. Olivi

  3. Instituto de Química de São Carlos, Universidade de São Paulo, 13560-970, São Carlos, SP, Brazil

    G. Tremiliosi-Filho

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  1. D. M. dos Anjos
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  2. K. B. Kokoh
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  3. J.M. Léger
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  4. A.R. DE Andrade
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  5. P. Olivi
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  6. G. Tremiliosi-Filho
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Correspondence to K. B. Kokoh.

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dos Anjos, D.M., Kokoh, K.B., Léger, J. et al. Electrocatalytic oxidation of ethanol on Pt–Mo bimetallic electrodes in acid medium. J Appl Electrochem 36, 1391–1397 (2006). https://doi.org/10.1007/s10800-006-9222-z

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  • DOI: https://doi.org/10.1007/s10800-006-9222-z

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