Surface Stabilizes Ceria in Unexpected Stoichiometry
| Autor: | M. Verónica Ganduglia-Pirovano, Reinhard Olbrich, Gustavo E. Murgida, A. M. Llois, Clemens Barth, Michael Reichling, V. Ferrari |
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| Přispěvatelé: | Centre Interdisciplinaire de Nanoscience de Marseille (CINaM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2017 |
| Předmět: |
Imagination
Materials science Chemical substance SURFACE Ciencias Físicas media_common.quotation_subject Oxide OXIGEN VACANCIES chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences Oxygen purl.org/becyt/ford/1 [https] chemistry.chemical_compound [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat] Physical and Theoretical Chemistry ComputingMilieux_MISCELLANEOUS Phase diagram media_common [PHYS]Physics [physics] CERIA MICROSCOPY purl.org/becyt/ford/1.3 [https] 021001 nanoscience & nanotechnology 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Astronomía Crystallography General Energy chemistry Chemical physics [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] Chemical stability 0210 nano-technology Science technology and society CIENCIAS NATURALES Y EXACTAS Stoichiometry |
| Zdroj: | CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET Journal of Physical Chemistry C Journal of Physical Chemistry C, American Chemical Society, 2017, 121 (12), pp.6844-6851. ⟨10.1021/acs.jpcc.7b00956⟩ Journal of Physical Chemistry C, 2017, 121 (12), pp.6844-6851. ⟨10.1021/acs.jpcc.7b00956⟩ |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | The prototype reducible oxide ceria is known for its rich phase diagram and its ability to absorb and deliver oxygen. The high oxygen storage capacity is the basis for the use of ceria in catalytic and sensor applications where the surface plays a paramount role for device functionality. By direct imaging, we reveal the reconstruction of the ceria (111) surface in five periodic structures representing reduction stages ranging from CeO2 to Ce2O3. Theoretical modeling shows that the (√7 × 3)R19.1° reconstruction, representing the previously unknown Ce3O5 stoichiometry, is stabilized at the surface but cannot be assigned to a bulk structure. Statistical modeling explains the thermodynamic stability of surface phases depending on the oxygen chemical potential and the coexistence of certain phases over a range of temperatures. These results are crucial for understanding geometric and electronic structure-function correlations in nanostructured ceria and the rational design of novel ceria-based functional systems. Fil: Olbrich, Reinhard. Universität Osnabrück; Alemania Fil: Murgida, Gustavo Ezequiel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Investigaciones y Aplicaciones no Nucleares. Gerencia de Física (Centro Atómico Constituyentes); Argentina Fil: Ferrari, Valeria Paola. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Barth, Clemens. Aix-Marseille Université; Francia Fil: Llois, Ana Maria. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Investigaciones y Aplicaciones no Nucleares. Gerencia de Física (Centro Atómico Constituyentes); Argentina Fil: Reichling, Michael. Universität Osnabrück; Alemania Fil: Ganduglia Pirovano, Maria Veronica. Consejo Superior de Investigaciones Científicas. Instituto de Catálisis y Petroleoquímica; España |
| Databáze: | OpenAIRE |
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