Electrical and oxygen storage/release properties of nanocrystalline ceria-zirconia solid solutions

Marta Boaro; Alessandro Trovarelli; Jin Ha Hwang; Thomas O. Mason

doi:10.1016/S0167-2738(02)00004-8

Electrical and oxygen storage/release properties of nanocrystalline ceria-zirconia solid solutions

Marta Boaro, Alessandro Trovarelli^*, Jin Ha Hwang, Thomas O. Mason

^*Corresponding author for this work

Materials Science and Engineering

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

109 Scopus citations

Abstract

The electrical properties of nanocrystalline Ce_0.75Zr_0.25O₂ solid solution in the ceria-zirconia system were investigated using four-point DC conductivity measurements and impedance spectroscopy. Conductivity measurements were carried out as a function of temperature (723-821 K) and oxygen partial pressure (pO₂ = 10^-3 - 1 atm). The results were compared to the properties of bulk oxide of similar composition. Both the nanocrystalline and the coarsened oxide exhibit mixed conduction where the prevailing contribution is electronic. However, the nanocrystalline oxide shows a higher ionic contribution due to the enhancement of anionic vacancy mobility, which is more than one order of magnitude higher. In contrast with pure ceria, the electronic conductivity and activation energy for diffusion is similar in both nanocrystalline and sintered material, which could explain the similar reduction behavior shown by high and low surface area samples. These results are discussed and interpreted in terms of the role of surface area and the related crystallite size in the catalytic and reduction properties of ceria-zirconia solid solutions.

Original language	English (US)
Pages (from-to)	85-95
Number of pages	11
Journal	Solid State Ionics
Volume	147
Issue number	1-2
DOIs	https://doi.org/10.1016/S0167-2738(02)00004-8
State	Published - Mar 1 2002

Keywords

Catalysis
CeO-ZrO
Ceria
Ceria-zirconia
Conductivity
Impedance spectroscopy
Nanocrystalline
Oxy gen storage
Oxygen diffusion
Reduction behavior
Zirconia

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

Access to Document

10.1016/S0167-2738(02)00004-8

Cite this

@article{aebb90dddc7a4454988c091a117904ac,

title = "Electrical and oxygen storage/release properties of nanocrystalline ceria-zirconia solid solutions",

abstract = "The electrical properties of nanocrystalline Ce0.75Zr0.25O2 solid solution in the ceria-zirconia system were investigated using four-point DC conductivity measurements and impedance spectroscopy. Conductivity measurements were carried out as a function of temperature (723-821 K) and oxygen partial pressure (pO2 = 10-3 - 1 atm). The results were compared to the properties of bulk oxide of similar composition. Both the nanocrystalline and the coarsened oxide exhibit mixed conduction where the prevailing contribution is electronic. However, the nanocrystalline oxide shows a higher ionic contribution due to the enhancement of anionic vacancy mobility, which is more than one order of magnitude higher. In contrast with pure ceria, the electronic conductivity and activation energy for diffusion is similar in both nanocrystalline and sintered material, which could explain the similar reduction behavior shown by high and low surface area samples. These results are discussed and interpreted in terms of the role of surface area and the related crystallite size in the catalytic and reduction properties of ceria-zirconia solid solutions.",

keywords = "Catalysis, CeO-ZrO, Ceria, Ceria-zirconia, Conductivity, Impedance spectroscopy, Nanocrystalline, Oxy gen storage, Oxygen diffusion, Reduction behavior, Zirconia",

author = "Marta Boaro and Alessandro Trovarelli and Hwang, {Jin Ha} and Mason, {Thomas O.}",

note = "Funding Information: Financial support from the Italian National Research Council (CNR), Program CNR/University/Italian Public Scientific Institution/Foreign Institution of Research, Short-term Mobility-2000 (MB); the University of Udine, Project for Young Researchers 1999 (MB); Regione Friuli Venezia Giulia, fondo regionale per la ricerca L.R. 3/1998 and of the US Department of Energy under Grant No. DE-FG02-84-ER45097 (TOM, JHH) is gratefully acknowledged. The authors wish to thank Grace Davison for providing the samples used in this study and Prof. Dolcetti for his comments on the manuscript.",

year = "2002",

month = mar,

day = "1",

doi = "10.1016/S0167-2738(02)00004-8",

language = "English (US)",

volume = "147",

pages = "85--95",

journal = "Solid State Ionics",

issn = "0167-2738",

publisher = "Elsevier",

number = "1-2",

}

TY - JOUR

T1 - Electrical and oxygen storage/release properties of nanocrystalline ceria-zirconia solid solutions

AU - Boaro, Marta

AU - Trovarelli, Alessandro

AU - Hwang, Jin Ha

AU - Mason, Thomas O.

N1 - Funding Information: Financial support from the Italian National Research Council (CNR), Program CNR/University/Italian Public Scientific Institution/Foreign Institution of Research, Short-term Mobility-2000 (MB); the University of Udine, Project for Young Researchers 1999 (MB); Regione Friuli Venezia Giulia, fondo regionale per la ricerca L.R. 3/1998 and of the US Department of Energy under Grant No. DE-FG02-84-ER45097 (TOM, JHH) is gratefully acknowledged. The authors wish to thank Grace Davison for providing the samples used in this study and Prof. Dolcetti for his comments on the manuscript.

PY - 2002/3/1

Y1 - 2002/3/1

N2 - The electrical properties of nanocrystalline Ce0.75Zr0.25O2 solid solution in the ceria-zirconia system were investigated using four-point DC conductivity measurements and impedance spectroscopy. Conductivity measurements were carried out as a function of temperature (723-821 K) and oxygen partial pressure (pO2 = 10-3 - 1 atm). The results were compared to the properties of bulk oxide of similar composition. Both the nanocrystalline and the coarsened oxide exhibit mixed conduction where the prevailing contribution is electronic. However, the nanocrystalline oxide shows a higher ionic contribution due to the enhancement of anionic vacancy mobility, which is more than one order of magnitude higher. In contrast with pure ceria, the electronic conductivity and activation energy for diffusion is similar in both nanocrystalline and sintered material, which could explain the similar reduction behavior shown by high and low surface area samples. These results are discussed and interpreted in terms of the role of surface area and the related crystallite size in the catalytic and reduction properties of ceria-zirconia solid solutions.

AB - The electrical properties of nanocrystalline Ce0.75Zr0.25O2 solid solution in the ceria-zirconia system were investigated using four-point DC conductivity measurements and impedance spectroscopy. Conductivity measurements were carried out as a function of temperature (723-821 K) and oxygen partial pressure (pO2 = 10-3 - 1 atm). The results were compared to the properties of bulk oxide of similar composition. Both the nanocrystalline and the coarsened oxide exhibit mixed conduction where the prevailing contribution is electronic. However, the nanocrystalline oxide shows a higher ionic contribution due to the enhancement of anionic vacancy mobility, which is more than one order of magnitude higher. In contrast with pure ceria, the electronic conductivity and activation energy for diffusion is similar in both nanocrystalline and sintered material, which could explain the similar reduction behavior shown by high and low surface area samples. These results are discussed and interpreted in terms of the role of surface area and the related crystallite size in the catalytic and reduction properties of ceria-zirconia solid solutions.

KW - Catalysis

KW - CeO-ZrO

KW - Ceria

KW - Ceria-zirconia

KW - Conductivity

KW - Impedance spectroscopy

KW - Nanocrystalline

KW - Oxy gen storage

KW - Oxygen diffusion

KW - Reduction behavior

KW - Zirconia

UR - http://www.scopus.com/inward/record.url?scp=0036499385&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036499385&partnerID=8YFLogxK

U2 - 10.1016/S0167-2738(02)00004-8

DO - 10.1016/S0167-2738(02)00004-8

M3 - Article

AN - SCOPUS:0036499385

SN - 0167-2738

VL - 147

SP - 85

EP - 95

JO - Solid State Ionics

JF - Solid State Ionics

IS - 1-2

ER -

Electrical and oxygen storage/release properties of nanocrystalline ceria-zirconia solid solutions

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this