Pergolesi D Gilardi E Fabbri E Roddatis V Harrington GF Lippert T Kilner JA Traversa E 2018 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. application/pdf https://sonar.ch/global/documents/140053 eng info:eu-repo/semantics/altIdentifier/doi/10.1021/acsami.8b01903 info:eu-repo/semantics/altIdentifier/pmid/29617562 info:eu-repo/semantics/openAccess ACS applied materials & interfaces. - 2018 ceria fuel cells heterostructures interfaces thin films zirconia Interface Effects on the Ionic Conductivity of Doped Ceria-Yttria-Stabilized Zirconia Heterostructures. http://purl.org/coar/resource_type/c_6501