Jump to main content
Jump to site search

Issue 30, 2007
Previous Article Next Article

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

Author affiliations

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.

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

Back to tab navigation

Publication details

The article was received on 23 Mar 2007, accepted on 21 May 2007 and first published on 07 Jun 2007


Article type: Feature Article
DOI: 10.1039/B704426G
Citation: J. Mater. Chem., 2007,17, 3104-3111
  •   Request permissions

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

    E. Kendrick, M. S. Islam and P. R. Slater, J. Mater. Chem., 2007, 17, 3104
    DOI: 10.1039/B704426G

Search articles by author

Spotlight

Advertisements