Chemical composition and reactivity of water on hexagonal Pt-group metal surfaces

Shavorskiy, A., Gladys, M.J. and Held, G. (2008) Chemical composition and reactivity of water on hexagonal Pt-group metal surfaces. Physical Chemistry Chemical Physics, 10 (40). pp. 6150-6159. ISSN 1463-9076 doi: 10.1039/b808235a

Abstract/Summary

The dissociation behaviour and valence-electronic structure of water adsorbed on clean and oxygen-covered Ru{0001}, Rh{111}, Pd{111}, Ir{111} and Pt{111} surfaces has been studied by high-resolution X-ray photoelectron spectroscopy with the aim of identifying similarities and trends within the Pt-group metals. On average, we find higher reactivity for the 4d metals (Ru, Rh, Pd) as compared to 5d (Ir, Pt), which is correlated with characteristic shifts in the 1b(1) and 3a(1) molecular orbitals of water. Small amounts of oxygen (<0.2 ML) induce dissociation of water on all five surfaces, for higher coverages (>0.25 ML) only intact water is observed. Under UHV conditions these higher coverages can only be reached on the 4d metals, the 5d metals are, therefore, not passivated.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/11614
Item Type	Article
Refereed	Yes
Divisions	Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
Uncontrolled Keywords	STRUCTURAL-PROPERTIES, PARTIAL DISSOCIATION, CARBON-MONOXIDE, ADSORPTION, PT(111), RU(001), OXYGEN, PD(111), RH(111), H2O
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