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

Daniele Pergolesi; Elisa Gilardi; Emiliana Fabbri; Vladimir Roddatis; George F. Harrington; Thomas Lippert; John A. Kilner; Enrico Traversa

doi:10.1021/acsami.8b01903

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

Daniele Pergolesi, Elisa Gilardi, Emiliana Fabbri, Vladimir Roddatis, George F. Harrington, Thomas Lippert, John A. Kilner, Enrico Traversa

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

26 Citations (SciVal)

Abstract

Multilayered heterostructures of Ce_0.85Sm_0.15O_2-δ and Y_0.16Zr_0.92O_2-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.

Original language	English
Pages (from-to)	14160-14169
Number of pages	10
Journal	ACS Applied Materials and Interfaces
Volume	10
Issue number	16
DOIs	https://doi.org/10.1021/acsami.8b01903
Publication status	Published - 25 Apr 2018

Bibliographical note

Funding Information:
*E-mail: [email protected]. ORCID Daniele Pergolesi: 0000-0002-6231-0237 Elisa Gilardi: 0000-0002-8831-0104 Emiliana Fabbri: 0000-0002-8627-6926 Funding This research was supported by the NCCR MARVEL, funded by the Swiss National Science Foundation. This research is also supported by the SFB 1073 via Z02 project. Notes The authors declare no competing financial interest.

Keywords

ceria
fuel cells
heterostructures
interfaces
thin films
zirconia

ASJC Scopus subject areas

General Materials Science

Access to Document

10.1021/acsami.8b01903

Cite this

@article{dd085abc43b7426bb548cfb443c470e6,

title = "Interface Effects on the Ionic Conductivity of Doped Ceria-Yttria-Stabilized Zirconia Heterostructures",

abstract = "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.",

keywords = "ceria, fuel cells, heterostructures, interfaces, thin films, zirconia",

author = "Daniele Pergolesi and Elisa Gilardi and Emiliana Fabbri and Vladimir Roddatis and Harrington, {George F.} and Thomas Lippert and Kilner, {John A.} and Enrico Traversa",

note = "Funding Information: *E-mail: [email protected]. ORCID Daniele Pergolesi: 0000-0002-6231-0237 Elisa Gilardi: 0000-0002-8831-0104 Emiliana Fabbri: 0000-0002-8627-6926 Funding This research was supported by the NCCR MARVEL, funded by the Swiss National Science Foundation. This research is also supported by the SFB 1073 via Z02 project. Notes The authors declare no competing financial interest. ",

year = "2018",

month = apr,

day = "25",

doi = "10.1021/acsami.8b01903",

language = "English",

volume = "10",

pages = "14160--14169",

journal = "ACS Applied Materials and Interfaces",

issn = "1944-8244",

publisher = "American Chemical Society",

number = "16",

}

TY - JOUR

T1 - Interface Effects on the Ionic Conductivity of Doped Ceria-Yttria-Stabilized Zirconia Heterostructures

AU - Pergolesi, Daniele

AU - Gilardi, Elisa

AU - Fabbri, Emiliana

AU - Roddatis, Vladimir

AU - Harrington, George F.

AU - Lippert, Thomas

AU - Kilner, John A.

AU - Traversa, Enrico

N1 - Funding Information: *E-mail: [email protected]. ORCID Daniele Pergolesi: 0000-0002-6231-0237 Elisa Gilardi: 0000-0002-8831-0104 Emiliana Fabbri: 0000-0002-8627-6926 Funding This research was supported by the NCCR MARVEL, funded by the Swiss National Science Foundation. This research is also supported by the SFB 1073 via Z02 project. Notes The authors declare no competing financial interest.

PY - 2018/4/25

Y1 - 2018/4/25

N2 - 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.

AB - 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.

KW - ceria

KW - fuel cells

KW - heterostructures

KW - interfaces

KW - thin films

KW - zirconia

UR - http://www.scopus.com/inward/record.url?scp=85045884421&partnerID=8YFLogxK

U2 - 10.1021/acsami.8b01903

DO - 10.1021/acsami.8b01903

M3 - Article

C2 - 29617562

AN - SCOPUS:85045884421

SN - 1944-8244

VL - 10

SP - 14160

EP - 14169

JO - ACS Applied Materials and Interfaces

JF - ACS Applied Materials and Interfaces

IS - 16

ER -

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

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this