期刊
ACS NANO
卷 8, 期 10, 页码 10878-10884出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn5047053
关键词
ceria; EELS; tomography catalysis; redox
类别
资金
- European Research Council (ERC) [246791-COUNTATOMS, 335078-COLOURATOMS]
- fund for scientific research Flanders (FWO-Vlaanderen)
- European Union [312483-ESTEEM2]
Using electron tomography combined with electron energy loss spectroscopy (EELS), we are able to map the valency of the Ce ions in CeO2-x nanocrystals in three dimensions. Our results show a clear facet-dependent reduction shell at the surface of ceria nanoparticles; {111} surface facets show a low surface reduction, whereas at {001} surface facets, the cerium ions are more likely to be reduced over a larger surface shell. Our generic tomographic technique allows a full 3D data cube to be reconstructed, containing an EELS spectrum in each voxel. This possibility enables a three-dimensional investigation of a plethora of material-specific physical properties such as valency, chemical composition, oxygen coordination, or bond lengths, triggering the synthesis of nanomaterials with improved properties.
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