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Title: Effect of Doping on Surface Reactivity and Conduction Mechanism in Sm-doped CeO2 Thin Films

Journal Article · · Advanced Functional Materials
DOI:https://doi.org/10.1021/nn505345c· OSTI ID:1185545
 [1];  [2];  [2];  [1];  [1];  [3];  [3];  [2];  [2];  [2];  [4];  [4];  [5]
  1. Univ. of Rome Tor Vergata (Italy)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Science and Technology Facilities Council (STFC), Harwell Campus, Oxford (United Kingdom). Diamond Light Source, Ltd.
  4. ORNL
  5. University of Roma Tor Vergata, Italy

A systematic study by reversible and hysteretic electrochemical strain microscopy (ESM) in samples of Cerium oxide with different Sm content and in several working conditions allows disclosing the microscopic mechanism underlying the difference in electrical conduction mechanism and related surface activity, such as water adsorption and dissociation with subsequent proton liberation. We measure the behavior of the reversible hysteresis loops by changing temperature and humidity, both in standard ESM configuration and using the first order reversal curve method. The measurements have been performed at much lower temperature ranges with respect to alternative measuring techniques. Complementing our study with hard x-ray photoemission spectroscopy and irreversible scanning probe measurements we find that water incorporation is favored until the doping with Sm is too high to allow the presence of Ce3+. The influence of doping on the surface reactivity clearly emerges from all of our experimental results. We find that at lower Sm concentration proton conduction is prevalent, featured by lower activation energy and higher electrical conductivity. The defect concentrations determine the type of the prevalent charge carrier in a doping dependent manner.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725; CNMS2014-046
OSTI ID:
1185545
Alternate ID(s):
OSTI ID: 1286788
Journal Information:
Advanced Functional Materials, Vol. 8, Issue 12
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 33 works
Citation information provided by
Web of Science

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Cited By (6)

Dynamic mechanical control of local vacancies in NiO thin films journal May 2018
Big data and deep data in scanning and electron microscopies: deriving functionality from multidimensional data sets journal May 2015
Strongly enhanced oxygen ion transport through samarium-doped CeO2 nanopillars in nanocomposite films journal October 2015
Room Temperature Polarization Phenomena in Nanocrystalline and Epitaxial Thin Films of Gd-Doped Ceria Studied by Kelvin Probe Force Microscopy journal January 2018
Origin and Tunability of Unusually Large Surface Capacitance in Doped Cerium Oxide Studied by Ambient-Pressure X-Ray Photoelectron Spectroscopy journal March 2016
Atomic structures and oxygen dynamics of CeO2 grain boundaries journal February 2016