Nanoscale heterogeneity in ceria zirconia with low-temperature redox properties

Ruigang Wang, Peter Crozier, Renu Sharma, James Adams

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

We have investigated nanoscale compositional and structural variations in Ce0.5Zr0.5O2 samples with different redox properties. Different samples were prepared using a spray freezing technique, and the synthesis conditions were varied to yield materials with reduction temperatures in the range of 400-750°C. X-ray diffraction and thermal gravimetric analysis were used to characterize the average structures and redox properties of these materials. The nanoscale structural and compositional variations in individual nanoparticles of high activity were determined with atomic-scale electron imaging and nanometer-resolution electron energy loss spectroscopy. During the early stage of particle formation, the crystallization process is initiated via the nucleation of ceria-rich nanodomains. This results in the formation of high-surface-area materials that exhibit nanoscale compositional heterogeneity consisting of Ce-rich cores surrounded by Zr-rich shells. The effect of high-temperature redox cycling on the nanoscale structure, composition, and low-temperature redox properties was also determined. Our analysis suggests that our most active material exhibits significant compositional and structural heterogeneity at the nanometer level.

Original languageEnglish (US)
Pages (from-to)18278-18285
Number of pages8
JournalJournal of Physical Chemistry B
Volume110
Issue number37
DOIs
StatePublished - Sep 21 2006

Fingerprint

Cerium compounds
zirconium oxides
Zirconia
Temperature
Gravimetric analysis
Electron energy loss spectroscopy
Crystallization
Freezing
freezing
sprayers
thermal analysis
Nucleation
energy dissipation
nucleation
electron energy
crystallization
Nanoparticles
Imaging techniques
X ray diffraction
nanoparticles

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Nanoscale heterogeneity in ceria zirconia with low-temperature redox properties. / Wang, Ruigang; Crozier, Peter; Sharma, Renu; Adams, James.

In: Journal of Physical Chemistry B, Vol. 110, No. 37, 21.09.2006, p. 18278-18285.

Research output: Contribution to journalArticle

@article{4575376d3c8f457784e47f4e6eed028f,
title = "Nanoscale heterogeneity in ceria zirconia with low-temperature redox properties",
abstract = "We have investigated nanoscale compositional and structural variations in Ce0.5Zr0.5O2 samples with different redox properties. Different samples were prepared using a spray freezing technique, and the synthesis conditions were varied to yield materials with reduction temperatures in the range of 400-750°C. X-ray diffraction and thermal gravimetric analysis were used to characterize the average structures and redox properties of these materials. The nanoscale structural and compositional variations in individual nanoparticles of high activity were determined with atomic-scale electron imaging and nanometer-resolution electron energy loss spectroscopy. During the early stage of particle formation, the crystallization process is initiated via the nucleation of ceria-rich nanodomains. This results in the formation of high-surface-area materials that exhibit nanoscale compositional heterogeneity consisting of Ce-rich cores surrounded by Zr-rich shells. The effect of high-temperature redox cycling on the nanoscale structure, composition, and low-temperature redox properties was also determined. Our analysis suggests that our most active material exhibits significant compositional and structural heterogeneity at the nanometer level.",
author = "Ruigang Wang and Peter Crozier and Renu Sharma and James Adams",
year = "2006",
month = "9",
day = "21",
doi = "10.1021/jp063113z",
language = "English (US)",
volume = "110",
pages = "18278--18285",
journal = "Journal of Physical Chemistry B Materials",
issn = "1520-6106",
publisher = "American Chemical Society",
number = "37",

}

TY - JOUR

T1 - Nanoscale heterogeneity in ceria zirconia with low-temperature redox properties

AU - Wang, Ruigang

AU - Crozier, Peter

AU - Sharma, Renu

AU - Adams, James

PY - 2006/9/21

Y1 - 2006/9/21

N2 - We have investigated nanoscale compositional and structural variations in Ce0.5Zr0.5O2 samples with different redox properties. Different samples were prepared using a spray freezing technique, and the synthesis conditions were varied to yield materials with reduction temperatures in the range of 400-750°C. X-ray diffraction and thermal gravimetric analysis were used to characterize the average structures and redox properties of these materials. The nanoscale structural and compositional variations in individual nanoparticles of high activity were determined with atomic-scale electron imaging and nanometer-resolution electron energy loss spectroscopy. During the early stage of particle formation, the crystallization process is initiated via the nucleation of ceria-rich nanodomains. This results in the formation of high-surface-area materials that exhibit nanoscale compositional heterogeneity consisting of Ce-rich cores surrounded by Zr-rich shells. The effect of high-temperature redox cycling on the nanoscale structure, composition, and low-temperature redox properties was also determined. Our analysis suggests that our most active material exhibits significant compositional and structural heterogeneity at the nanometer level.

AB - We have investigated nanoscale compositional and structural variations in Ce0.5Zr0.5O2 samples with different redox properties. Different samples were prepared using a spray freezing technique, and the synthesis conditions were varied to yield materials with reduction temperatures in the range of 400-750°C. X-ray diffraction and thermal gravimetric analysis were used to characterize the average structures and redox properties of these materials. The nanoscale structural and compositional variations in individual nanoparticles of high activity were determined with atomic-scale electron imaging and nanometer-resolution electron energy loss spectroscopy. During the early stage of particle formation, the crystallization process is initiated via the nucleation of ceria-rich nanodomains. This results in the formation of high-surface-area materials that exhibit nanoscale compositional heterogeneity consisting of Ce-rich cores surrounded by Zr-rich shells. The effect of high-temperature redox cycling on the nanoscale structure, composition, and low-temperature redox properties was also determined. Our analysis suggests that our most active material exhibits significant compositional and structural heterogeneity at the nanometer level.

UR - http://www.scopus.com/inward/record.url?scp=33749679964&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33749679964&partnerID=8YFLogxK

U2 - 10.1021/jp063113z

DO - 10.1021/jp063113z

M3 - Article

C2 - 16970447

AN - SCOPUS:33749679964

VL - 110

SP - 18278

EP - 18285

JO - Journal of Physical Chemistry B Materials

JF - Journal of Physical Chemistry B Materials

SN - 1520-6106

IS - 37

ER -