Heteroepitaxy of Cerium Oxide Thin Films on Cu(111)

Materials

Josef Mysliveპk¹  Vladimir Matolín¹  Iva Matolínová¹ 

关键词: heterogeneous catalysis;    monoatomic step;    surface oxygen vacancy;    oxygen storage capacity;    active site;    energy conversion and storage;    fuel cell;    single-atom catalyst;   

DOI  :  10.3390/ma8095307

来源: mdpi

【 摘 要 】

An important part of fundamental research in catalysis is based on theoretical and modeling foundations which are closely connected with studies of single-crystalline catalyst surfaces. These so-called model catalysts are often prepared in the form of epitaxial thin films, and characterized using advanced material characterization techniques. This concept provides the fundamental understanding and the knowledge base needed to tailor the design of new heterogeneous catalysts with improved catalytic properties. The present contribution is devoted to development of a model catalyst system of CeO₂ (ceria) on the Cu(111) substrate. We propose ways to experimentally characterize and control important parameters of the model catalyst—the coverage of the ceria layer, the influence of the Cu substrate, and the density of surface defects on ceria, particularly the density of step edges and the density and the ordering of the oxygen vacancies. The large spectrum of controlled parameters makes ceria on Cu(111) an interesting alternative to a more common model system ceria on Ru(0001) that has served numerous catalysis studies, mainly as a support for metal clusters.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.