Water adsorption at the surface of pure and Gd-doped ceria

Anna Kossoy; Hagai Cohen; Tatyana Bendikov; Ellen Wachtel; Igor Lubomirsky

doi:10.1016/j.ssi.2011.05.011

Water adsorption at the surface of pure and Gd-doped ceria

Anna Kossoy, Hagai Cohen, Tatyana Bendikov, Ellen Wachtel, Igor Lubomirsky

Weizmann Institute of Science

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

21 Scopus citations

Abstract

The presence of water at the surface of sputtered thin films of Ce _0.8Gd_0.2O_1.9, which display elastic anomalies as a function of thermal treatment, and of stoichiometric CeO₂ films, which do not, was monitored using X-ray photoelectron spectroscopy. We find that considerably more water is strongly bound at the surface of the Ce _0.8Gd_0.2O_1.9 films than of the CeO₂ films. This supports the theoretical prediction that water binds preferentially at the oxygen vacancy sites. In addition, all films were treated according to the protocol which has been shown to produce inelastic behavior in the doped films: annealed at 500 °C, exposed to ambient atmosphere for one month and then heated to 250 °C in ultra-high vacuum. Neither the Ce _0.8Gd_0.2O_1.9 nor the CeO₂ films show any change in the amount of adsorbed water. We therefore conclude that changes in the amount of surface adsorbed water do not play a role in the elastic anomalies observed as a function of thermal treatment of Ce_0.8Gd _0.2O_1.9 films.

Original language	English
Pages (from-to)	1-4
Number of pages	4
Journal	Solid State Ionics
Volume	194
Issue number	1
DOIs	https://doi.org/10.1016/j.ssi.2011.05.011
State	Published - 14 Jul 2011
Externally published	Yes

Bibliographical note

Funding Information:
I.L. wishes to thank the US–Israel Binational Science Foundation for funding this research. The research is also made possible in part by the generosity of the Harold Perlman Family .

Funding

I.L. wishes to thank the US–Israel Binational Science Foundation for funding this research. The research is also made possible in part by the generosity of the Harold Perlman Family .

Funders	Funder number
United States-Israel Binational Science Foundation

Keywords

Ceria
Chemical strain effect
Gadolinium doped ceria
Water incorporation
X-ray photoelectron- spectroscopy (XPS)

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title = "Water adsorption at the surface of pure and Gd-doped ceria",

abstract = "The presence of water at the surface of sputtered thin films of Ce 0.8Gd0.2O1.9, which display elastic anomalies as a function of thermal treatment, and of stoichiometric CeO2 films, which do not, was monitored using X-ray photoelectron spectroscopy. We find that considerably more water is strongly bound at the surface of the Ce 0.8Gd0.2O1.9 films than of the CeO2 films. This supports the theoretical prediction that water binds preferentially at the oxygen vacancy sites. In addition, all films were treated according to the protocol which has been shown to produce inelastic behavior in the doped films: annealed at 500 °C, exposed to ambient atmosphere for one month and then heated to 250 °C in ultra-high vacuum. Neither the Ce 0.8Gd0.2O1.9 nor the CeO2 films show any change in the amount of adsorbed water. We therefore conclude that changes in the amount of surface adsorbed water do not play a role in the elastic anomalies observed as a function of thermal treatment of Ce0.8Gd 0.2O1.9 films.",

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author = "Anna Kossoy and Hagai Cohen and Tatyana Bendikov and Ellen Wachtel and Igor Lubomirsky",

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AU - Kossoy, Anna

AU - Cohen, Hagai

AU - Bendikov, Tatyana

AU - Wachtel, Ellen

AU - Lubomirsky, Igor

N1 - Funding Information: I.L. wishes to thank the US–Israel Binational Science Foundation for funding this research. The research is also made possible in part by the generosity of the Harold Perlman Family .

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N2 - The presence of water at the surface of sputtered thin films of Ce 0.8Gd0.2O1.9, which display elastic anomalies as a function of thermal treatment, and of stoichiometric CeO2 films, which do not, was monitored using X-ray photoelectron spectroscopy. We find that considerably more water is strongly bound at the surface of the Ce 0.8Gd0.2O1.9 films than of the CeO2 films. This supports the theoretical prediction that water binds preferentially at the oxygen vacancy sites. In addition, all films were treated according to the protocol which has been shown to produce inelastic behavior in the doped films: annealed at 500 °C, exposed to ambient atmosphere for one month and then heated to 250 °C in ultra-high vacuum. Neither the Ce 0.8Gd0.2O1.9 nor the CeO2 films show any change in the amount of adsorbed water. We therefore conclude that changes in the amount of surface adsorbed water do not play a role in the elastic anomalies observed as a function of thermal treatment of Ce0.8Gd 0.2O1.9 films.

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KW - X-ray photoelectron- spectroscopy (XPS)

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Water adsorption at the surface of pure and Gd-doped ceria

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