Coadsorption of oxygen and hydrogen on Ru(001): blocking and electronic effects of preadsorbed oxygen
The coadsorption of oxygen and hydrogen on Ru(001) at 80 K has been studied by thermal desorption, work function measurement, low-energy electron diffraction, and Auger spectroscopy. Oxygen adsorbed in an ordered p(2 x 2) layer induces formation of new weak adsorption sites within each unit cell and simultaneously blocks the adsorption of hydrogen in the sites typical of a clean surface. Hydrogen adsorbs dissociatively with a high sticking probability in the modified sites, and the adsorption is accompanied by a small but complex work function change. The authors propose that weakly bound hydrogen occupies both surface and subsurface threefold sites. With oxygen coverage increasing above 0.25, the new adsorption sites are progressively blocked and on a surface saturated by a p(1 x 2) oxygen layer the adsorption of hydrogen is completely inhibited. The coadsorption phenomena are dependent upon the sequence of adsorption in preparing the coadsorbed layer and on the ordering of the preadsorbed layer. They also find the hydrogen overlayer suppresses completely the oxygen adsorption.
- Research Organization:
- Brookhaven National Lab., Upton, NY
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 7203736
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 90:23; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
AUGER ELECTRON SPECTROSCOPY
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
COHERENT SCATTERING
DATA
DESORPTION
DIFFRACTION
ELECTRON DIFFRACTION
ELECTRON SPECTROSCOPY
ELEMENTS
EXPERIMENTAL DATA
FUNCTIONS
HYDROGEN
INFORMATION
LOW TEMPERATURE
METALS
NONMETALS
NUMERICAL DATA
OXYGEN
PLATINUM METALS
RUTHENIUM
SCATTERING
SORPTIVE PROPERTIES
SPECTROSCOPY
SURFACE PROPERTIES
TRANSITION ELEMENTS
WORK FUNCTIONS