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

Title: Chemical composition and reactivity of water on hexagonal Pt-group metal surfaces
Creator: Shavorskiy, A.; Gladys, M. J.; Held, G.
Relation: Physical Chemistry Chemical Physics Vol. 10, Issue 40, p. 6150-6159
Publisher Link: http://dx.doi.org/10.1039/b808235a
Publisher: Royal Society of Chemistry
Resource Type: journal article
Date: 2008
Description: 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 1b1 and 3a1 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.
Subject: water; chemical composition; reactivity; Pt-group metals; metal surfaces; oxygen
Identifier: http://hdl.handle.net/1959.13/43063
Identifier: uon:5192
Identifier: ISSN:1463-9076
Language: eng
Reviewed

		Thumbnail	File	Description	Size	Format