Interaction of oxygen with the (111) surface of NaAu2
| Autor: | Okan Deniz, Patricia A. Thiel, Roland Widmer, Wenyu Huang, Chad D. Yuen, Mark Wallingford, C.R. Brundle, Emma J. Kwolek, Deborah L. Schlagel, Oliver Gröning, Holly Walen |
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| Rok vydání: | 2016 |
| Předmět: |
Surface (mathematics)
Inorganic chemistry Oxide Intermetallic chemistry.chemical_element 02 engineering and technology Surfaces and Interfaces 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Photochemistry 01 natural sciences Oxygen 0104 chemical sciences Surfaces Coatings and Films Catalysis chemistry.chemical_compound Adsorption chemistry X-ray photoelectron spectroscopy Materials Chemistry Carbonate 0210 nano-technology |
| Zdroj: | Surface Science. 650:167-176 |
| ISSN: | 0039-6028 |
| DOI: | 10.1016/j.susc.2015.12.015 |
| Popis: | NaAu2, in powder form, is known to be an active catalyst for CO oxidation. The goal of the present study is to elucidate the interaction of one reactant, molecular oxygen, with a single-crystal surface of this material, NaAu2(111). Exposing the clean surface to gas-phase molecular oxygen produces three types of oxygen on the surface. One type is bound in spurious carbonate that forms during exposure. The second is adsorbed atomic oxygen that interacts both with Na and Au. The third type is atomic oxygen that interacts mainly or only with Na. We propose that the last species is an oxide of Na distributed throughout the surface and near-surface region. Its formation is accompanied by surface segregation of Na. |
| Databáze: | OpenAIRE |
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