One-step synthesis of composite electrolytes of Eu-doped ceria and alkali metal carbonates |
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| Authors: | Surendran Rajesh Daniel A Macedo Rubens M Nascimento Graziele L Souza Filipe ML Figueiredo Fernando MB Marques |
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| Affiliation: | 1. Dept. of Materials and Ceramic Eng., CICECO, University of Aveiro, 3810-193 Aveiro, Portugal;2. PPGCEM – Federal University of Rio Grande do Norte, 59072-970 Natal, Brazil;3. Dept. of Chemical Eng., Federal University of Rio Grande do Norte, 59072-970 Natal, Brazil |
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| Abstract: | Europium-doped ceria (EDC, Ce0.9Eu0.1O2−δ)/alkaline carbonate (LNC, (Li,Na)2CO3) composite ceramics prepared through a one-step citrate-based route were analyzed by powder X-ray diffraction, infrared and laser Raman spectroscopies as well as scanning and transmission electron microscopy. The electrochemical behavior of the electrolyte material was studied by impedance spectroscopy in air, CO2 and N2 + H2 (90/10 vol%, respectively) gas mixtures, in the temperature range 300–600 °C. The sub micrometric and even nanosized ceramic particles appeared as merged inside the mixed carbonates, with modest grain to grain necking. The EDC/LNC composite electrolytes showed a conductivity of 0.27 S cm−1 at 600 °C in air, amongst the best ever reported, exceeding the usual requirements for fuel cell applications. |
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| Keywords: | Composite electrolytes Ceria Electrical conductivity One-step synthesis |
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