Oxidation of Reduced Ceria by Incorporation of Hydrogen

Zhaorui Li; Kristin Werner; Kun Qian; Rui You; Agata Płucienik; Aiping Jia; Lihui Wu; Liyuan Zhang; Haibin Pan; Helmut Kuhlenbeck; Shamil Shaikhutdinov; Weixin Huang; Hans-Joachim Freund

doi:10.1002/anie.201907117

Oxidation of Reduced Ceria by Incorporation of Hydrogen

Angew Chem Int Ed Engl. 2019 Oct 7;58(41):14686-14693. doi: 10.1002/anie.201907117. Epub 2019 Sep 12.

Authors

Affiliations

¹ Hefei National Laboratory for Physical Sciences at Microscale, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, CAS Key Laboratory of Materials for Energy Conversion and Department of Chemical Physics, University of Science and Technology of China, Hefei, 230029, China.
² Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195, Berlin, Germany.
³ Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry Zhejiang Normal University, Jinhua, 321004, China.
⁴ National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, 230029, China.

Abstract

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 Ce³⁺ species to hydrogen, which results in the formation of Ce⁴⁺ , and thus in oxidation of ceria.

Keywords: ceria; hydrides; oxidation; powder; thin films.

Publication types

Review

Abstract

Publication types

Grants and funding