In this study, Ce0.8Gd0.1Lu0.1O2-α was synthesized by a sol-gel method. And Ce0.8Gd0.1Lu0.1O2-α-(Na/K)Clcomposite electrolyte was prepared at 750 °C. The phase composition, microstructure, conductivity andfuel cell properties of the composite were studied at 500–750 °C. The XRD results showed that nochemical reaction occurred between chloride and Ce0.8Gd0.1Lu0.1O2-α. The log s ～ log (pO2) resultsshowed that Ce0.8Gd0.1Lu0.1O2-α-(Na/K)Cl is a pure ionic conductor in an oxidizing atmosphere. Theperformance of oxygen concentration discharge cell further showed that Ce0.8Gd0.1Lu0.1O2-α-(Na/K)Cl isan excellent oxygen ion conductor in an oxidizing atmosphere.
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