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The influence of hydrogen peroxide on carbon monoxide electrooxidation at Pt/C and Pt:Ru/C electrodes

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Abstract

Polymer electrolyte fuel cells constitute one of the most important efficiency energy converters for non-centralised uses. However, the use of fuels arising from reformate processes significantly lowers the current efficiency because of anodic catalytic poison coming from adsorbed carbon monoxide (COad). In this work, the influence of the addition of hydrogen peroxide in the flow current is studied, considering the adsorption and electrochemical oxidation of carbon monoxide on carbon-supported Pt (20% Pt/Vulcan) and Pt:Ru (1:1, 20% Pt:Ru/Vulcan) catalysts in 2 M sulphuric acid. The investigation was conducted applying cyclic voltammetry and on-line differential electrochemical mass spectrometry. A series of experiments has been performed to investigate the influence of the temperature as well as the time of contact and the concentration of hydrogen peroxide. Oxidation of COad to carbon dioxide occurs at lower potentials in the presence of hydrogen peroxide. Moreover, it is possible to remove ca. 70% of COad on Pt/C electrodes. On the other hand, for PtRu/C electrodes, similar charge values to those of Pt/C electrodes were obtained for the CO stripping, but the process occurs at more negative potentials. In this case, the effect of partial desorption for COad by interaction with hydrogen peroxide is added to the bifunctional mechanism usually considered for this alloy.

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Acknowledgments

Financial support from MEC (NAN2004-09333-C05-04, FEDER, Spain) and PDT (Uruguay) is gratefully acknowledged. The authors wish to thank AECI for financing the collaboration project between both laboratories (A/2564/05). O. Guillén-Villafuerte thanks Cajacanarias for the fellowship.

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Authors and Affiliations

  1. Departamento de Química Física, Facultad de Química, Universidad de La Laguna, 38071, La Laguna, Tenerife, Spain

    G. Planes, O. Guillén-Villafuerte, J. L. Rodríguez & E. Pastor

  2. Laboratorio de Electroquímica, Facultad de Ciencias, Universidad de la República, Igua 4225, C.P.11400, Montevideo, Uruguay

    F. Zinola

  3. Instituto de Ingeniería Química, Facultad de Ingeniería, Universidad de la República, J. Herrera y Reissig 565, C.P.11300, Montevideo, Uruguay

    S. Martínez

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  1. S. Martínez
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  2. F. Zinola
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  3. G. Planes
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  4. O. Guillén-Villafuerte
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  5. J. L. Rodríguez
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  6. E. Pastor
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Corresponding author

Correspondence to E. Pastor.

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This paper is dedicated to Prof. Francisco Nart, in memoriam.

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Martínez, S., Zinola, F., Planes, G. et al. The influence of hydrogen peroxide on carbon monoxide electrooxidation at Pt/C and Pt:Ru/C electrodes. J Solid State Electrochem 11, 1521–1529 (2007). https://doi.org/10.1007/s10008-007-0345-x

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  • DOI: https://doi.org/10.1007/s10008-007-0345-x

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