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Effect of Acetic Acid on Carbon Monoxide Electrooxidation over Tin Oxide and Rhodium-Modified Platinum Electrode Materials

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Abstract

The ethanol-to-CO2 conversion in a direct ethanol fuel cell application, which should theoretically exchange 12 electrons/molecule, leads mainly to acetic acid and, in a small amount, to carbon monoxide (CO) at the surface of Sn and Rh oxide-modified anode materials. According to the amount of these intermediate products, the reaction mechanism was found to be thoroughly modified. Therefore, investigations with cyclic voltammetric CO stripping combined with in situ infrared spectroscopy have aided to assess how the amount of produced acetic acid influenced CO electrooxidation using Pt/C, Pt80Rh20/C, Pt–SnO2/C, or Pt80Rh20–SnO2/C as electrode material. Based on the results, the adsorption of CO was hindered when the acetic acid concentration increased and the potential of the CO oxidation process shifted toward higher values.

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Acknowledgments

This work was mainly conducted within the framework of a collaborative program CAPES/COFECUB under Grant no. Ch 747-12. P. Olivi thanks FAPESP (Project 6554-0/2011) and CNPq for financial support.

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Authors and Affiliations

  1. Departamento de Química da Faculdade de Filosofia Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Av. Bandeirantes, 3900, Ribeirão Preto, SP, 14040-901, Brazil

    Layciane A. Soares, Fabiana L. S. Purgato & Paulo Olivi

  2. IC2MP, UMR 7285 CNRS, Université de Poitiers, 4, rue Michel Brunet B-27, TSA 51106, 86073, Poitiers Cedex 09, France

    Claudia Morais, Teko W. Napporn & K. B. Kokoh

Authors
  1. Layciane A. Soares
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  2. Fabiana L. S. Purgato
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  3. Claudia Morais
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  4. Teko W. Napporn
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  5. K. B. Kokoh
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  6. Paulo Olivi
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Correspondence to Paulo Olivi.

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Soares, L.A., Purgato, F.L.S., Morais, C. et al. Effect of Acetic Acid on Carbon Monoxide Electrooxidation over Tin Oxide and Rhodium-Modified Platinum Electrode Materials. Electrocatalysis 8, 11–15 (2017). https://doi.org/10.1007/s12678-016-0333-y

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  • DOI: https://doi.org/10.1007/s12678-016-0333-y

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