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Oxidation of Reduced Ceria by Incorporation of Hydrogen
Author(s) -
Li Zhaorui,
Werner Kristin,
Qian Kun,
You Rui,
Płucienik Agata,
Jia Aiping,
Wu Lihui,
Zhang Liyuan,
Pan Haibin,
Kuhlenbeck Helmut,
Shaikhutdinov Shamil,
Huang Weixin,
Freund HansJoachim
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201907117
Subject(s) - x ray photoelectron spectroscopy , hydrogen , hydride , inorganic chemistry , materials science , oxygen , chemistry , crystallography , chemical engineering , organic chemistry , engineering
The interaction of hydrogen with reduced ceria (CeO 2− x ) powders and CeO 2− x (111) thin films was studied using several characterization techniques including TEM, XRD, LEED, XPS, RPES, EELS, ESR, and TDS. The results clearly indicate that both in reduced ceria powders as well as in reduced single crystal ceria films hydrogen may form hydroxyls at the surface and hydride species below the surface. The formation of hydrides is clearly linked to the presence of oxygen vacancies and is accompanied by the transfer of an electron from a Ce 3+ species to hydrogen, which results in the formation of Ce 4+ , and thus in oxidation of ceria.