SOLID OXIDE ELECTROLYTE MATERIALS FOR ELECTROCHEMICAL CELLS

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Materials for electrochemical cells are provided. BaZr?0.4#191Ce?0.4#191M?0.2#191O?3#191 compounds, where M represents one or more rare earth elements, are provided for use as electrolytes. PrBa?0.5#191Sr?0.5#191Co?2-x#191Fe?x#191O?5+#191δ is provided for use as a cathode. Also provided are electrochemical cells, such as protonic ceramic fuel cells, incorporating the compounds as electrolytes and cathodes.