Optimizing oxygen diffusion in cathode materials for solid oxide fuel cells

A. I. Chroneos department of Materials Science and Metallurgy, University of Cambridge, Cambridge CB2 3QZ, United Kingdom Department of Materials, Imperial College London, London SW7 2AZ, United Kingdom
D. Parfitt Department of Materials, Imperial College London, London SW7 2AZ, United Kingdom

Keywords: LnBa1xSrxCo2O5 s, Molecular dynamics, Oxygen migration, Anisotropy

Abstract

Recent investigations have revealed that the Ruddlesden-Popper series (A_n+₁B_nO_3n+₁) and the layered perovskite LnBaCo₂O₅+s (Ln = rare-earth cations) are promising as cathodes for intermediate temperature solid oxide fuel cells. For these to be economical the oxygen diffusion must be maximized. In the present investigation we propose strategies for optimizing oxygen diffusion in these materials by modifying the oxygen stoichiometry, the composition and cation disorder.

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