title: Kinetically limited CO adsorption: spill-over as a highly effective adsorption pathway on bimetallic surfaces.
abstract: We demonstrate that the (local) adsorbed carbon monoxide, COad , coverage on the Pt-free areas of bimetallic Pt/Ru(0001) surfaces (a Ru(0001) substrate partly covered by Pt monolayer islands) can be increased to ∼0.80 monolayers (ML), well above the established saturation COad coverage of 0.68 ML, even under ultrahigh vacuum conditions by using spill-over of CO adsorbed on the Pt islands to the Ru areas as an highly effective adsorption channel. The apparent COad saturation coverage of 0.68 ML on pure Ru(0001) is identified as due to kinetic limitations, hindering further uptake from the gas phase, rather than being caused by thermodynamic reasons. This spill-over mechanism is proposed to be a general phenomenon for adsorption on bimetallic surfaces.
authors.affiliation: Institute of Surface Chemistry and Catalysis, Albert-Einstein-Allee 47, Ulm University, 89069 Ulm (Germany).
authors.forename: Heinrich
authors.initials: H
authors.lastname: Hartmann
authors.forename: Thomas
authors.initials: T
authors.lastname: Diemant
authors.forename: R Jürgen
authors.initials: RJ
authors.lastname: Behm
keywords: adsorption kinetics; bimetallic surfaces; carbon monoxide; coverages; spill-over effect