Cerium reduction at the interface between ceria and yttria-stabilised zirconia and implications for interfacial oxygen non-stoichiometry
- Epitaxial CeO 2 films with different thickness were grown on Y 2 O 3 stabilised Zirconia substrates. Reduction of cerium ions at the interface between CeO 2 films and yttria stabilised zirconia substrates is demonstrated using aberration-corrected scanning transmission electron microscopy combined with electron energy-loss spectroscopy. It is revealed that most of the Ce ions were reduced from Ce 4+ to Ce 3+ at the interface region with a decay of several nanometers. Several possibilities of charge compensations are discussed. Irrespective of the details, such local non-stoichiometries are crucial not only for understanding charge transport in such hetero-structures but also for understanding ceria catalytic properties.
| Document Type: | Article |
|---|---|
| Author: | Kepeng Song, Herbert K. Schmid, Vesna Srot, Elisa Gilardi, Giuliano Gregori, Kui Du, Joachim Maier, Peter A. van Aken |
| URN: | urn:nbn:de:bsz:291:415-4589 |
| DOI: | https://doi.org/10.1063/1.4867556 |
| ISSN: | 2166-532X |
| Parent Title (English): | APL Materials |
| Volume: | 2 |
| Issue: | 3 |
| Pagenumber: | 32104 |
| Language: | English |
| Year of first Publication: | 2014 |
| Release Date: | 2022/11/18 |
| Tag: | catalysis; cerium compounds; charge compensation; electron energy loss spectra; epitaxial growth; epitaxial layers; scanning-transmission electron microscopy; stoichiometry |
| Funding Information: | Natural Sciences Foundation of China (Grant No. 51221264). European Union Seventh Framework Program [FP/2007-2013] under Grant Agreement No. 312483 (ESTEEM2). |
| Section: | 06.03.2014 |
| Scientific Units: | Innovative Electron Microscopy |
| Open Access: | Open Access |
| Signature: | INM 2014/33 |
| Licence (German): |  Creative Commons - CC BY - Namensnennung 4.0 International |
