DOIAbstract
The adsorption of water and coadsorption with oxygen on the missing-row reconstructed Pt{110}-(1×2) surface was studied by using temperature-programmed desorption (TPD) and X-ray photoelectron spectroscopy. Coadsorbed oxygen below saturation (<0.65 ± 0.05 ML) leads to the formation of OH, which occupies sites near the ridge Pt atoms. In contrast to the more closely packed Pt{111} surface, OH appears not to form hydrogen bonds with coadsorbed water molecules and is stable after the desorption of water up to about 205 K (as determined by TPD). Because OH and atomic oxygen compete for adsorption sites, water dissociation is only observed for oxygen coverages below saturation. In the absence of coadsorbed oxygen, water stays intact at all tempe...
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