Developing apatites for solid oxide fuel cells: insight into structural, transport and doping properties

E Kendrick, M S Islam, P R Slater

Research output: Contribution to journalArticle

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Abstract

Materials displaying high oxide-ion conductivity have attracted considerable interest due to technological applications in solid oxide fuel cells (SOFCs), oxygen sensors and separation membranes. This has driven research into the identification of new classes of oxide-ion conductors, and in this review, work on the recently discovered apatite-type silicate/germanate oxide-ion conductors is presented. In contrast to the traditional perovskite- and fluorite-based oxide-ion conductors, in which conduction proceeds via oxygen vacancies, the research on these apatite systems suggests that the conductivity involves interstitial oxide-ions. In addition, the flexibility of the tetrahedral (Si/GeO4) framework also plays a crucial role in facilitating oxide-ion migration. Detailed doping studies have shown that the apatite structure is able to accommodate a large range of dopants (in terms of both size and charge state), and the influence of these dopants on the conductivity is discussed.
LanguageEnglish
Pages3104-3111
Number of pages8
JournalJournal of Materials Chemistry
Volume17
Issue number30
DOIs
StatusPublished - 2007

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Apatites
Apatite
Solid oxide fuel cells (SOFC)
Oxides
Doping (additives)
Ions
Silicates
Oxygen sensors
Fluorspar
Oxygen vacancies
Perovskite
Membranes

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Developing apatites for solid oxide fuel cells: insight into structural, transport and doping properties. / Kendrick, E; Islam, M S; Slater, P R.

In: Journal of Materials Chemistry, Vol. 17, No. 30, 2007, p. 3104-3111.

Research output: Contribution to journalArticle

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