Mechanism of Carbon Dioxide and Water Incorporation in Ba2TiO4: A Joint Computational and Experimental Study

Adam J. McSloy, Ivan Trussov, Abbey Jarvis, David J. Cooke, Peter R. Slater, Pooja M. Panchmatia

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Abstract

CO2 incorporation in solids is attracting considerable interest in a range of energy-related areas. Materials degradation through CO2 incorporation is also a critical problem with some fuel cell materials, particularly for proton conducting ceramic fuel cells. Despite this importance, the fundamental understanding of the mechanism of CO2 incorporation is lacking. Furthermore, the growing use of lower temperature sol gel routes for the design and synthesis of new functional materials may be unwittingly introducing significant residual carbonate and hydroxyl ions into the material, and so studies such as the one reported here investigating the incorporation of carbonate and hydroxyl ions are important, to help explain how this may affect the structure and properties. This study on Ba2TiO4 suggests highly unfavorable intrinsic defect formation energies but comparatively low H2O and CO2 incorporation energies, in accord with experimental findings. Carbonate defects are likely to form in both pristine and undoped Ba2TiO4 systems, whereas those based on H2O will only form in systems containing other supporting defects, such as oxygen interstitials or vacancies. However, both hydroxyl and carbonate defects will trap oxide ion defects induced through doping, and the results from both experimental and modeling studies suggest that it is primarily the presence of carbonate that is responsible for stabilizing the high temperature α′-phase at lower temperatures.

LanguageEnglish
Pages1061-1069
Number of pages9
JournalJournal of Physical Chemistry C
Volume122
Issue number2
Early online date22 Dec 2017
DOIs
Publication statusPublished - 18 Jan 2018

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Carbonates
Carbon Dioxide
carbon dioxide
carbonates
Carbon dioxide
Defects
Water
defects
water
fuel cells
Fuel cells
Ions
ions
Functional materials
energy of formation
Hydroxyl Radical
Temperature
Oxides
Vacancies
Sol-gels

Cite this

McSloy, Adam J. ; Trussov, Ivan ; Jarvis, Abbey ; Cooke, David J. ; Slater, Peter R. ; Panchmatia, Pooja M. / Mechanism of Carbon Dioxide and Water Incorporation in Ba2TiO4 : A Joint Computational and Experimental Study. In: Journal of Physical Chemistry C. 2018 ; Vol. 122, No. 2. pp. 1061-1069.
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Mechanism of Carbon Dioxide and Water Incorporation in Ba2TiO4 : A Joint Computational and Experimental Study. / McSloy, Adam J.; Trussov, Ivan; Jarvis, Abbey; Cooke, David J.; Slater, Peter R.; Panchmatia, Pooja M.

In: Journal of Physical Chemistry C, Vol. 122, No. 2, 18.01.2018, p. 1061-1069.

Research output: Contribution to journalArticle

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