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Oxidation of Reduced Ceria by Incorporation of Hydrogen

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Werner,  Kristin
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Plucienik,  Agata
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Kuhlenbeck,  Helmut
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Shaikhutdinov,  Shamil K.
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Freund,  Hans-Joachim
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Citation

Li, Z., Werner, K., Qian, K., You, R., Plucienik, A., Jia, A., et al. (2019). Oxidation of Reduced Ceria by Incorporation of Hydrogen. Angewandte Chemie International Edition, 58(41), 14686-14693. doi:10.1002/anie.201907117.


Cite as: http://hdl.handle.net/21.11116/0000-0004-7678-1
Abstract
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.