Reducing the chemical expansion coefficient in ceria by addition of zirconia
Citation:
Bishop, SR, Marrocchelli, D, Fang, W, Amezawa, K, Yashiro, K, Watson, GW, Reducing the chemical expansion coefficient in ceria by addition of zirconia, Energy & Environmental Science, 6, 4, 2013, 1142-1146Download Item:
Abstract:
For thev first time, the role of isovalent Zr substitution in cerium oxide on the non-stoichiometry induced dilation (chemical expansion) was
investigated. Chemical expansion was derived experimentally using
HTXRD, dilatometry, and TGA measurements on Pr
0.1
Zr
0.4
Ce
0.5
O
1.95
d
and computationally with DFTcalculations on Zr
0.5
Ce
0.5
O
2
d
.Though
Zr was found to increase the reducibility and the corresponding
chemical expansion of ceria in the studied range, the relationship
between chemical expansion and non-stoichiometry (the chemical
expansion coe
ffi
cient) was signi
fi
cantly smaller (54% less) than that
observed in ceria, and consistent with predictions from the authors'
previous work. The origin of the reduced chemical expansion coef-
fi
cient, associated with a larger contraction of the lattice around
oxygen vacancies, is explained using DFT calculations and corrobo-
rated with prior investigations of enhanced reducibility of ceria
?
zirconia. Additionally, implications of this discovery for solid oxide
fuel cells and heterogeneous catalyst systems are also discussed.
Sponsor
Grant Number
Science Foundation Ireland (SFI)
tcche031b
Science Foundation Ireland (SFI)
tcche026b
U.S. Department of Energy
DE-SC0002633
Science Foundation Ireland (SFI)
09/RFP/MTR2274
Science Foundation Ireland (SFI)
08/RFP/MTR1044
Author's Homepage:
http://people.tcd.ie/watsongDescription:
PUBLISHED
Author: WATSON, GRAEME
Type of material:
Journal ArticleCollections
Series/Report no:
Energy & Environmental Science6
4
Availability:
Full text availableDOI:
http://dx.doi.org/10.1039/c3ee23917aMetadata
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