Controlling Heteroepitaxy by Oxygen Chemical Potential: Exclusive Growth of (100) Oriented Ceria Nanostructures on Cu(111)
- Univ. of Bremen (Germany)
- Charles Univ., Prague (Czech Republic). Faculty of Mathematics and Physics
- Univ. of Bremen (Germany). MAPEX Center for Materials and Processes and Inst. of Solid State Physics
- Brookhaven National Lab. (BNL), Upton, NY (United States)
We present a novel and simple method for the preparation of a well-defined CeO2(100) model system on Cu(111) based on the adjustment of the Ce/O ratio during growth. The method yields micrometer-sized, several nanometers high, single-phase CeO2(100) islands with controllable size and surface termination that can be benchmarked against the known (111) nanostructured islands on Cu(111). We also demonstrate the ability to adjust the Ce to O stoichiometry from CeO2(100) (100% Ce4+) to c-Ce2O3(100) (100% Ce3+), which can be readily recognized by characteristic surface reconstructions observed by low-energy electron diffraction. Finally, the discovery of the highly stable CeOx(100) phase on a hexagonally close packed metal surface represents an unexpected growth mechanism of ceria on Cu(111), and it provides novel opportunities to prepare more elaborate models, benchmark surface chemical reactivity, and thus gain valuable insights into the redox chemistry of ceria in catalytic processes.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC00112704
- OSTI ID:
- 1303025
- Report Number(s):
- BNL-112522-2016-JA; R&D Project: CO009; KC0302010
- Journal Information:
- Journal of Physical Chemistry. C, Vol. 120, Issue 9; ISSN 1932-7447
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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