Redox Properties of Ordered Macroporous Ce-Zr Mixed Oxides

Autor:	Dino Tonti, María José Torralvo, Jesús Sanz, Elisa Roman, Eduardo Enciso, Lidia Martínez
Rok vydání:	2009
Předmět:	Materials science Inorganic chemistry Redox
Zdroj:	ECS Transactions. 25:1573-1582
ISSN:	1938-6737 1938-5862
DOI:	10.1149/1.3205693
Popis:	In this contribution finely textured three-dimensionally ordered macroporous (3DOM) mixed oxides of composition Zr0.6Ce0.4O2 were prepared by the inverse opal technique. By using thermal analysis and photoelectron spectroscopy the oxygen storage and the redox response to different environments has been investigated. Multiple high temperature oxidation-reduction cycles decrease the initial high sensitivity of the surface oxidation state of Ce to the environment. This has been ascribed to the development of Ce(III) phases. Finally, we present a simple analysis of XPS data that allow the detection of surface inhomogeneities on Ce-containing oxides. We show that phase segregation can produce chemically heterogeneous surfaces.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ee95c418d97aadb80f4760db06816dcd https://doi.org/10.1149/1.3205693 Zobrazit plný text záznamu