Abstract
CO adsorption and electro-oxidation on a Pt(111) electrode modified by Ru deposition was studied by IR spectroscopy. The IR spectra in the region of the CO stretching vibration exhibit distinct bands which can be assigned to CO adsorbed on the Pt substrate (CO|Pt) and on Ru islands (CO|Ru). This is in contrast with IR studies of Pt Ru alloy electrodes where only a single vibrational band of adsorbed CO is observed. The integrated band intensities of the CO|Ru and of CO|Pt bands on the Ru-modified Pt(111) electrode decrease simultaneously at the onset potential of CO oxidation. The results are interpreted within the framework of a bifunctional mechanism of CO electro-oxidation, postulating active Pt sites in close proximity to the Ru islands and a high mobility of the CO|Pt adsorbate layer. The differences in the IR spectra between the Ru|Pt(111) electrode and the Pt Ru alloys are explained by disparate surface structures (Ru islands versus homogeneous distribution of Pt and Ru atoms).
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
