Transport properties of solid oxide electrolyte ceramics: a brief review

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Solid State Ionics 174 (2004) 135 – 149 www.elsevier.com/locate/ssi

Review

Transport properties of solid oxide electrolyte ceramics: a brief review
V.V. Khartona, F.M.B. Marquesa, A. Atkinsonb,*
a

Department of Ceramics and Glass Engineering, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal b Department of Materials, Imperial College, Exhibition Road, London SW7 2AZ, UK Received4 February 2004; accepted 20 June 2004

Abstract This work is centered on the comparative analysis of oxygen ionic conductivity, electronic transport properties and thermal expansion of solid electrolyte ceramics, providing a brief overview of the materials having maximum potential performance in various high-temperature electrochemical devices, such as solid oxide fuel cells (SOFCs).Particular emphasis is focused on the oxygen ionic conductors reported during the last 10–15 years, including derivatives of c-Bi4V2O11 (BIMEVOX), La2Mo2O9 (LAMOX), Ln10Àx Si6O26-based apatites, (Gd,Ca)2Ti2O7Àd pyrochlores and perovskite-related phases based on LaGaO3 and Ba2In2O5, in order to identify their specific features determining possible applications. The properties of the new ion-conductingphases are compared to data on well-known solid electrolytes, such as stabilized zirconia, d-Bi2O3-based ceramics, doped ceria and LaAlO3. The compositions exhibiting highest ionic conductivity are briefly discussed. D 2004 Elsevier B.V. All rights reserved.
PACS: 66.10.Ed; 67.55.Hz; 81.05.Je Keywords: Solid oxide electrolyte; Ceramics; Oxygen ionic conductivity; Electronic conduction; Thermalexpansion

Contents 1. Introduction. . . . . . . . . . . . . . . . . . . . . . . 2. Zirconia-based solid electrolytes . . . . . . . . . . . . 3. LaGaO3-based electrolytes . . . . . . . . . . . . . . . 4. Doped ceria electrolytes . . . . . . . . . . . . . . . . 5. d-Bi2O3- and Bi4V2O11-based ceramics . . . . . . . . 6. Materials based on La2Mo2O9 (LAMOX) . . . . . . . 7. Perovskite- andbrownmilleritelike phases derived from 8. Perovskites based on LnBO3 (B=Al, In, Sc, Y) . . . . 9. Solid electrolytes with apatite structure. . . . . . . . . 10. Pyrochlores and fluorite-type (Y,Nb,Zr)O2Àd . . . . . . Acknowledgements . . . . . . . . . . . . . . . . . . . . . References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Ba2In2O5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . 135 136 139 139 142 143 144 144 145 146 147 147

1. Introduction Technologies based on the use of high-temperature electrochemical cells with oxygen ion-conducting solid
* Corresponding author. Tel: +44 207 5946780; fax: +44 207 583194. E-mail address: alan.atkinson@imperial.ac.uk (A. Atkinson). 0167-2738/$ - see front matter D 2004 Elsevier B.V. All rights reserved.doi:10.1016/j.ssi.2004.06.015

electrolytes, provide important advantages with respect to the conventional industrial processes. In particular, solid oxide fuel cells (SOFCs) are considered as alternative electric power generation systems due to high energy conversion efficiency, fuel flexibility including the prospects to operate directly on natural gas and environmental safety [1–5]. Practical application of...
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