Epitaxial Cubic Ce2O3 Films via Ce-CeO2 Interfacial Reaction

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autor(en): Stetsovych V, Pagliuca F, Dvorak F, Duchon T, Vorokhta M, Aulicka M, Lachnitt J, Schernich S, Matolinova I, Veltruska K, Skala T, Mazur D, Myslivecek J, Libuda J, Matolin V
Zeitschrift: Journal of Physical Chemistry Letters
Verlag: AMER CHEMICAL SOC
Jahr der Veröffentlichung: 2013
Band: 4
Heftnummer: 6
Seitenbereich: 866-871
ISSN: 1948-7185


Abstract

Thin films of reduced ceria supported on metals are often applied as substrates in model studies of the chemical reactivity of ceria based catalysts. Of special interest are the properties of oxygen vacancies in ceria. However, thin films of ceria prepared by established methods become increasingly disordered as the concentration of vacancies increases. Here, we propose an alternative method for preparing ordered reduced ceria films based on the physical vapor deposition and interfacial reaction of Ce with CeO2 films. The method yields bulk-truncated layers of cubic c-Ce2O3. Compared to CeO2 these layers contain 25% of perfectly ordered vacancies in the surface and subsurface allowing well-defined measurements of the properties of ceria in the limit of extreme reduction. Experimentally, c-Ce2O3(111) layers are easily identified by a characteristic 4 x 4 surface reconstruction with respect to CeO2(111). In addition, c-Ce2O3 layers represent an experimental realization of a normally unstable polymorph of Ce2O3. During interfacial reaction, c-Ce2O3 nucleates on the interface between CeO2 buffer and Ce overlayer and is further stabilized most likely by the tetragonal distortion of the ceria layers on Cu. The characteristic kinetics of the metal-oxide interfacial reactions may represent a vehicle for making other metastable oxide structures experimentally available.


FAU-Autoren / FAU-Herausgeber

Libuda, Jörg Prof. Dr.
Professur für Physikalische Chemie
Schernich, Stefan
Lehrstuhl für Physikalische Chemie II


Autor(en) der externen Einrichtung(en)
Università degli Studi di Modena e Reggio Emilia (UNIMORE)
Univerzita Karlova v Praze / Charles University in Prague


Zitierweisen

APA:
Stetsovych, V., Pagliuca, F., Dvorak, F., Duchon, T., Vorokhta, M., Aulicka, M.,... Matolin, V. (2013). Epitaxial Cubic Ce2O3 Films via Ce-CeO2 Interfacial Reaction. Journal of Physical Chemistry Letters, 4(6), 866-871. https://dx.doi.org/10.1021/jz400187j

MLA:
Stetsovych, Vitalii, et al. "Epitaxial Cubic Ce2O3 Films via Ce-CeO2 Interfacial Reaction." Journal of Physical Chemistry Letters 4.6 (2013): 866-871.

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Zuletzt aktualisiert 2019-20-02 um 08:38

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