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

Marta Boaro, Alessandro Trovarelli, Jin Ha Hwang, Thomas O Mason

Research output: Contribution to journalArticle

95 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)85-95
Number of pages11
JournalSolid State Ionics
Volume147
Issue number1-2
DOIs
Publication statusPublished - Mar 1 2002

Fingerprint

Cerium compounds
zirconium oxides
Zirconia
Oxides
Solid solutions
solid solutions
Oxygen
conductivity
oxygen
oxides
mixed oxides
Crystallite size
electronics
Partial pressure
Vacancies
partial pressure
nanocrystals
Electric properties
Activation energy
direct current

Keywords

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

ASJC Scopus subject areas

  • Electrochemistry
  • Physical and Theoretical Chemistry
  • Energy Engineering and Power Technology
  • Materials Chemistry
  • Condensed Matter Physics

Cite this

Electrical and oxygen storage/release properties of nanocrystalline ceria-zirconia solid solutions. / Boaro, Marta; Trovarelli, Alessandro; Hwang, Jin Ha; Mason, Thomas O.

In: Solid State Ionics, Vol. 147, No. 1-2, 01.03.2002, p. 85-95.

Research output: Contribution to journalArticle

Boaro, Marta ; Trovarelli, Alessandro ; Hwang, Jin Ha ; Mason, Thomas O. / Electrical and oxygen storage/release properties of nanocrystalline ceria-zirconia solid solutions. In: Solid State Ionics. 2002 ; Vol. 147, No. 1-2. pp. 85-95.
@article{e855a800c380449cbe20897c852ffe72,
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}",
year = "2002",
month = "3",
day = "1",
doi = "10.1016/S0167-2738(02)00004-8",
language = "English",
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

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

VL - 147

SP - 85

EP - 95

JO - Solid State Ionics

JF - Solid State Ionics

SN - 0167-2738

IS - 1-2

ER -