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On the effect of tungsten on CO oxidation at Pt electrodes

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Abstract

The co-catalytic effect of W on the oxidation of CO and methanol is investigated by using differential electrochemical mass spectrometry (DEMS). DEMS reveals that CO oxidation starts at 120 mV, overlapping with W oxidation. The action of W consists in shifting the pre-peak from 450 mV (as observed on pure Pt) to 200 mV. In this shifted pre-peak only 2% of the total adsorbed CO is oxidized independently from the W coverage, as compared to 10% on pure Pt. A correlation between the surface coverage of W as determined by XPS with the W oxidation peak charge in cyclic voltammetry suggests that the oxidation is a six-electron process.

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Acknowledgements

We are grateful to the DFG for financial support.

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Authors and Affiliations

  1. Institut für Physikalische Chemie, Universität Bonn, Römerstrasse 164, 53117, Bonn, Germany

    T. Nagel, N. Bogolowski, G. Samjeske & H. Baltruschat

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  1. T. Nagel
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  2. N. Bogolowski
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  3. G. Samjeske
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  4. H. Baltruschat
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Correspondence to H. Baltruschat.

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Dedicated to Prof. Wolf Vielstich on the occasion of his 80th birthday in recognition of his numerous contributions to interfacial electrochemistry.

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Nagel, T., Bogolowski, N., Samjeske, G. et al. On the effect of tungsten on CO oxidation at Pt electrodes. J Solid State Electrochem 7, 614–618 (2003). https://doi.org/10.1007/s10008-003-0440-6

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  • DOI: https://doi.org/10.1007/s10008-003-0440-6

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