Surface structure of coherently strained ceria ultrathin films
Abstract
Cerium oxide, or ceria, is an important material for solid oxide fuel cells and water splitting devices. Although the ceria surface is active in catalytic and electrochemical reactions, how its catalytic properties are affected by the surface structure under operating conditions is far from understood. We investigate the structure of the coherently strained CeO2 ultrathin films on yttria-stabilized zirconia (001) single crystals by specular synchrotron x-ray diffraction (XRD) under oxidizing conditions as a first step to study the surface structure in situ. An excellent agreement between the experiment data and the model is achieved by using a “stacks and islands” model that has a two-component roughness. One component is due to the tiny clusters of nanometer scale in lateral dimensions on each terrace, while the other component is due to slightly different CeO2 thickness that span over hundreds of nanometers on neighboring terraces. We attribute the nonuniform thickness to step depairing during the thin film deposition that is supported by the surface morphology results on the microscopic level. Importantly, our model also shows that the polarity of the ceria surface is removed by a half monolayer surface coverage of oxygen. In conclusion, the successful resolution of the ceria surface structuremore »
- Authors:
-
- Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Stanford Univ., Stanford, CA (United States)
- Sandia National Lab. (SNL-CA), Livermore, CA (United States)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1360186
- Alternate Identifier(s):
- OSTI ID: 1332028
- Grant/Contract Number:
- AC02-76SF00515; AC04-94AL85000
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 94; Journal Issue: 20; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Shi, Yezhou, Stone, Kevin H., Guan, Zixuan, Monti, Matteo, Cao, Chuntian, El Gabaly, Farid, Chueh, William C., and Toney, Michael F. Surface structure of coherently strained ceria ultrathin films. United States: N. p., 2016.
Web. doi:10.1103/PhysRevB.94.205420.
Shi, Yezhou, Stone, Kevin H., Guan, Zixuan, Monti, Matteo, Cao, Chuntian, El Gabaly, Farid, Chueh, William C., & Toney, Michael F. Surface structure of coherently strained ceria ultrathin films. United States. https://doi.org/10.1103/PhysRevB.94.205420
Shi, Yezhou, Stone, Kevin H., Guan, Zixuan, Monti, Matteo, Cao, Chuntian, El Gabaly, Farid, Chueh, William C., and Toney, Michael F. Mon .
"Surface structure of coherently strained ceria ultrathin films". United States. https://doi.org/10.1103/PhysRevB.94.205420. https://www.osti.gov/servlets/purl/1360186.
@article{osti_1360186,
title = {Surface structure of coherently strained ceria ultrathin films},
author = {Shi, Yezhou and Stone, Kevin H. and Guan, Zixuan and Monti, Matteo and Cao, Chuntian and El Gabaly, Farid and Chueh, William C. and Toney, Michael F.},
abstractNote = {Cerium oxide, or ceria, is an important material for solid oxide fuel cells and water splitting devices. Although the ceria surface is active in catalytic and electrochemical reactions, how its catalytic properties are affected by the surface structure under operating conditions is far from understood. We investigate the structure of the coherently strained CeO2 ultrathin films on yttria-stabilized zirconia (001) single crystals by specular synchrotron x-ray diffraction (XRD) under oxidizing conditions as a first step to study the surface structure in situ. An excellent agreement between the experiment data and the model is achieved by using a “stacks and islands” model that has a two-component roughness. One component is due to the tiny clusters of nanometer scale in lateral dimensions on each terrace, while the other component is due to slightly different CeO2 thickness that span over hundreds of nanometers on neighboring terraces. We attribute the nonuniform thickness to step depairing during the thin film deposition that is supported by the surface morphology results on the microscopic level. Importantly, our model also shows that the polarity of the ceria surface is removed by a half monolayer surface coverage of oxygen. In conclusion, the successful resolution of the ceria surface structure using in situ specular synchrotron XRD paves the way to study the structural evolution of ceria as a fuel cell electrode under catalytically relevant temperatures and gas pressures.},
doi = {10.1103/PhysRevB.94.205420},
journal = {Physical Review B},
number = 20,
volume = 94,
place = {United States},
year = {Mon Nov 14 00:00:00 EST 2016},
month = {Mon Nov 14 00:00:00 EST 2016}
}
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Works referencing / citing this record:
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