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Initial Oxidation of a Rh(110) Surface using Atomic or Molecular Oxygen and Reduction of the Surface Oxide by Hydrogen
- Source :
- The journal of physical chemistry. B 109 (2005): 13649–13655. doi:10.1021/jp0508002, info:cnr-pdr/source/autori:Dudin, P (1); Barinov, A (1); Gregoratti, L (1); Kiskinova, M (1); Esch, F (2); Dri, C (2,3); Africh, C (2,3); Comelli, G (2,3)/titolo:Initial oxidation of a Rh(110) surface using atomic or molecular oxygen and reduction of the surface oxide by hydrogen/doi:10.1021%2Fjp0508002/rivista:The journal of physical chemistry. B/anno:2005/pagina_da:13649/pagina_a:13655/intervallo_pagine:13649–13655/volume:109
- Publication Year :
- 2005
-
Abstract
- The formation conditions, morphology, and reactivity of thin oxide films, grown on a Rh(110) surface in the ambient of atomic or molecular oxygen, have been studied by means of laterally resolved core level spectroscopy, scanning tunneling microscopy and low energy electron diffraction. Exposures of Rh(110) to atomic oxygen lead to subsurface incorporation of oxygen even at room temperature and facile formation of an ordered, laterally uniform surface oxide at approximately 520 K, with a quasi-hexagonal structure and stoichiometry close to that of RhO(2). In the intermediate oxidation stages, the surface oxide coexists with areas of high coverage adsorption phases. After a long induction period, the reduction of the Rh oxide film with H(2) is very rapid and independent of the coexisting adsorption phases. The growth of the oxide film by exposure of a Rh(110) surface to molecular oxygen requires higher pressures and temperatures. The important role of the O(2) dissociation step in the oxidation process is reflected by the complex morphology of the oxide films grown in O(2) ambient, consisting of microscopic patches of different Rh and oxygen atomic density.
- Subjects :
- Low-energy electron diffraction
Hydrogen
Chemistry
Inorganic chemistry
Analytical chemistry
Oxide
chemistry.chemical_element
Oxygen
Dissociation (chemistry)
Surfaces, Coatings and Films
law.invention
chemistry.chemical_compound
Adsorption
law
Materials Chemistry
SCANNING-TUNNELING-MICROSCOPY
CO OXIDATION
REACTIVITY
RECONSTRUCTION
SPECTROSCOPY
ANISOTROPY
RUO2(110)
METALS
Physical and Theoretical Chemistry
Scanning tunneling microscope
Stoichiometry
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- The journal of physical chemistry. B 109 (2005): 13649–13655. doi:10.1021/jp0508002, info:cnr-pdr/source/autori:Dudin, P (1); Barinov, A (1); Gregoratti, L (1); Kiskinova, M (1); Esch, F (2); Dri, C (2,3); Africh, C (2,3); Comelli, G (2,3)/titolo:Initial oxidation of a Rh(110) surface using atomic or molecular oxygen and reduction of the surface oxide by hydrogen/doi:10.1021%2Fjp0508002/rivista:The journal of physical chemistry. B/anno:2005/pagina_da:13649/pagina_a:13655/intervallo_pagine:13649–13655/volume:109
- Accession number :
- edsair.doi.dedup.....7d450ab06c2718a2e7ceba8b2496db3b