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Published on: August 15, 2019
Low pressure oxidation of ordered Sn/Pd(110) surface alloys
1Faculty of Mathematics and Physics, Department of Surface and Plasma Science, Charles University, V Holešovičkách 2, 18000 Prague 8, Czech Republic. National Institute for Materials Science, 3-13, Sakura, Tsukuba 305-0003, Japan.
Low-pressure oxygen reacts with tin on palladium surfaces, forming tin oxides. This oxidation process involves a palladium-tin-oxygen interface layer and tin oxides on the surface.
Area of Science:
- Surface Science
- Materials Science
- Catalysis
Background:
- The Sn/Pd(110) system is a model for studying surface reactions.
- Understanding oxidation on metal alloys is crucial for catalysis and materials development.
Purpose of the Study:
- To investigate the low-pressure oxygen reaction with Sn/Pd(110) surface alloys.
- To characterize the oxidation states and surface structures formed.
Main Methods:
- Photoelectron spectroscopy using synchrotron radiation.
- Analysis of Sn 4d and Pd 3d core levels.
- Valence band spectroscopy.
Main Results:
- Oxygen adsorption significantly alters Sn 4d core levels, with minimal Pd 3d changes.
- Oxidation forms a Pd-Sn-O interface layer, SnO, and SnO(2) oxides.
- Tin oxides form on the surface, facilitated by a subsurface PdSn intermetallic alloy.
Conclusions:
- Tin oxidation on Pd(110) proceeds via distinct interface and surface oxide layers.
- PdSn alloy facilitates tin oxide formation and Pd-Sn bond dissociation.
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