- 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
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