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Journal Article

Electrocatalytic Activity of Ru-Modified Pt(111) Electrodes toward CO Oxidation

MPS-Authors
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Lin,  W. F.
Fritz Haber Institute, Max Planck Society;

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Zei,  Mau-Scheng
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Eiswirth,  Markus
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Ertl,  Gerhard
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Lin, W. F., Zei, M.-S., Eiswirth, M., Ertl, G., Iwasita, T., & Vielstich, W. (1999). Electrocatalytic Activity of Ru-Modified Pt(111) Electrodes toward CO Oxidation. The Journal of Physical Chemistry B, 103(33), 6968-6977. doi:10.1021/jp9910901.


Cite as: https://hdl.handle.net/21.11116/0000-0009-54E4-7
Abstract
The electrochemical deposition of Ru on Pt(111) electrodes has been investigated by electron diffraction, Auger spectroscopy, and cyclic voltammetry in a closed UHV transfer system. At small coverages Ru formed a monatomic commensurate layer, at higher coverage mostly small islands with a bilayer height were detected. When the Pt was almost completely covered by Ru, three-dimensional clusters developed. The island structure of Ru changed upon electrooxidation of CO, reflecting an enhanced mobility of Ru. Adsorption and electrooxidation of CO have been studied on such Ru-modified Pt(111) electrodes using cyclic voltammetry and in situ FTIR spectroscopy. Compared to the pure metals, the Ru−CO bond is weakened, the Pt−CO bond strengthened on the modified electrodes. The catalytic activity of the Ru/Pt(111) electrode toward CO adlayer oxidation is higher than that of pure Ru and a PtRu alloy (50:50). It is concluded that the electrooxidation of CO takes place preferentially at the Ru islands, while CO adsorbed on Pt migrates to them.