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Interface Effects on the Ionic Conductivity of Doped Ceria-Yttria-Stabilized Zirconia Heterostructures.

  • Pergolesi D Paul Scherrer Institut , 5232 Villigen-PSI , Switzerland.
  • Gilardi E Paul Scherrer Institut , 5232 Villigen-PSI , Switzerland.
  • Fabbri E Paul Scherrer Institut , 5232 Villigen-PSI , Switzerland.
  • Roddatis V Institute of Materials Physics , University of Göttingen , 37077 Göttingen , Germany.
  • Harrington GF Department of Materials , Imperial College London , London SW7 2BP , United Kingdom.
  • Lippert T Paul Scherrer Institut , 5232 Villigen-PSI , Switzerland.
  • Kilner JA Department of Materials , Imperial College London , London SW7 2BP , United Kingdom.
  • Traversa E School of Materials and Energy , University of Electronic Science and Technology of China , 2006 Xiyuan Road , Chengdu 611731 , Sichuan People's Republic of China.
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  • 2018-04-05
Published in:
  • ACS applied materials & interfaces. - 2018
ceria
fuel cells
heterostructures
interfaces
thin films
zirconia
English Multilayered heterostructures of Ce0.85Sm0.15O2-δ and Y0.16Zr0.92O2-δ of a high crystallographic quality were fabricated on (001)-oriented MgO single crystal substrates. Keeping the total thickness of the heterostructures constant, the number of ceria-zirconia bilayers was increased while reducing the thickness of each layer. At each interface Ce was found primarily in the reduced, 3+ oxidation state in a layer extending about 2 nm from the interface. Concurrently, the conductivity decreased as the thickness of the layers was reduced, suggesting a progressive confinement of the charge transport along the YSZ layers. The comparative analysis of the in-plane electrical characterization suggests that the contribution to the total electrical conductivity of these interfacial regions is negligible. For the smallest layer thickness of 2 nm the doped ceria layers are electrically insulating and the ionic transport only occurs through the zirconia layers. This is explained in terms of a reduced mobility of the oxygen vacancies in the highly reduced ceria.
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https://sonar.ch/global/documents/140053
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