Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 84: Poster Focus Session: Structure and Chemistry of Metal-Oxide Surfaces
O 84.9: Poster
Mittwoch, 14. März 2018, 18:15–20:30, Poster A
Ordered and disordered surface vacancies on a ceria film surface — •Reinhard Olbrich1, Gustavo E. Murgida2,3, Valeria Ferrari2,3, Clemens Barth4, Ana M. Llois2,3, Michael Reichling1, and M. Veronica Ganduglia-Pirovano5 — 1Fachbereich Physik, Universität Osnabrück, Barbarastr. 7, 49076 Osnabrück, Germany — 2Departamento de Física de la Materia Condensada, GIyA, CAC-CNEA, 1650 San Martín, Buenos Aires, Argentina — 3Consejo Nacional de Investigaciones Científicas y Técnicas - CONICET, C1033AAJ, Buenos Aires, Argentina — 4Aix-Marseille University, CNRS, CINaM UMR 7325, 13288 Marseille, France — 5Instituto de Catálisis y Petroleoquímica, Consejo Superior de Investigaciones Científicas- CSIC, 28049 Madrid, Spain
Obtaining information about the defect structure of cerium oxide surfaces is of paramount importance in
catalytic applications relying on the high oxygen storage capacity (OSC) of ceria.
We reveal surface vacancies on a 180 nm thick ceria film that arise from annealing in an ultra-high vacuum (UHV) environment at
various temperatures up to 1100K by direct imaging with a non-contact atomic force microscope (NC-AFM). The oxygen vacancies can be separated in regularly arranged vacancies in form of surface reconstructions representing reduction stages ranging from CeO2 to Ce2O3 and in vacancies appearing at disordered surface positions. We found that the disordered surface vacancies rearrange to some extend over time while the ordered vacancies are stable.