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Journal Article

Electrocatalytic oxidation of CO on Pt-modified Ru(0001) electrodes

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

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Citation

Lei, T., Zei, M.-S., & Ertl, G. (2005). Electrocatalytic oxidation of CO on Pt-modified Ru(0001) electrodes. Surface Science, 581(2-3), 142-154. doi:10.1016/j.susc.2005.02.037.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-08C7-5
Abstract
Various amounts of Pt were electrodeposited onto a Ru(0001) electrode, and the kinetics of electrooxidation of CO was studied by cyclic voltammetry. Ru(0001) covered with small amounts of Pt forming patches of 2D-monolayers exhibits only low activity if compared with the bare Ru(0001) or Pt(111) electrodes. However, with high Pt coverages associated with 3D cluster deposits the reactivity is markedly enhanced and reaches a maximum at about 50 % surface coverage and then decreases again. The results bear close resemblance to the properties of the reverse system, viz. Ru deposited onto Pt or even of Pt–Ru alloys and are rationalized in terms of a bifunctional mechanism: CO adsorbed at Pt sites react preferentially with OH–-species formed at adjacent Ru sites, while reaction on either Pt or Ru sites alone is less facile.