Abstract
The pairing of proton conducting electrolytes with chemically compatible electrode materials is key to their use in electrochemical devices. The reactivity of BaZrO 3 with respect to the well known ceramic oxides LaMnO 3, LaFeO 3, LaCoO 3 and La 2NiO 4 has been investigated with a view to the development of chemically inert cathode materials. Annealing of powder mixtures of the candidate electrode and BaZrO 3 showed only formation of small quantities of La 2Zr 2O 7 as a secondary phase. The low level of reaction and good chemical compatibility were further evidenced by diffusion couples of electrode | electrolyte. Only minor inter-diffusion of Ba and La was observed. However, the materials show considerable mismatch in thermal expansivity, resulting in detachment of the electrode from the electrolyte on cooling. These results have predictive relevance across a wider range of systems, and indicate that co-existence can be achieved with careful balancing of chemical activity via chemical substitution.
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