Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 41, Pages 14686-14693Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201907117
Keywords
ceria; hydrides; oxidation; powder; thin films
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Funding
- National Key R AMP
- D Program of MOST [2017YFB0602205]
- DFG-NSFC joint project [FR554/18-1, 21761132005]
- National Natural Science Foundation of China [21525313, 91745202]
- Changjiang Scholars Program of Ministry of Education of China
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The interaction of hydrogen with reduced ceria (CeO2-x) powders and CeO2-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 Ce3+ species to hydrogen, which results in the formation of Ce4+, and thus in oxidation of ceria.
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