ADSORPTION ON ORDERED BINARY ALLOY SURFACES: HYDROGEN ADSORPTION ON THE CLEAN AND CO-COVEREDCu3Pt(111)SURFACE

C. Becker, U. Schröder, R. Linke, B. Schieffer and K. Wandelt
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C. Becker: Institut für Physikalische und Theoretische Chemie der Universität Bonn, Wegelerstr. 12, 53115, Bonn, Germany
U. Schröder: Institut für Physikalische und Theoretische Chemie der Universität Bonn, Wegelerstr. 12, 53115, Bonn, Germany
R. Linke: Institut für Physikalische und Theoretische Chemie der Universität Bonn, Wegelerstr. 12, 53115, Bonn, Germany
B. Schieffer: Institut für Physikalische und Theoretische Chemie der Universität Bonn, Wegelerstr. 12, 53115, Bonn, Germany
K. Wandelt: Institut für Physikalische und Theoretische Chemie der Universität Bonn, Wegelerstr. 12, 53115, Bonn, Germany

Surface Review and Letters (SRL), 1996, vol. 03, issue 05n06, 1889-1897

Abstract: The adsorption of hydrogen, as well as the interaction of adsorbed CO and hydrogen, on theCu3Pt(111)surface have been studied using thermal desorption spectroscopy (TDS), high resolution electron energy loss spectroscopy (HREELS) and work function change measurements(ΔΦ). The results show that hydrogen adsorption and dissociation occur via platinum sites. The process proceeds with second order kinetics with respect to the number of platinum sites available. The desorption spectra are successfully simulated using a lattice gas model. From the simulations the desorption and lateral interaction energies are deduced, showing a weak hydrogen-hydrogen repulsion. The interaction of coadsorbed CO and hydrogen has also been investigated. In contrast to thePt(111)surface where a lateral segregation of the two adsorbed species takes place, the results presented here suggest a mixed overlayer.

Date: 1996
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DOI: 10.1142/S0218625X96002801

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