Elaboration of Solid Nano-Structured Electrolytes of Ce₀ꓸ₈₅₋ₓGd₀ꓸ₁₅MₓO₂₋δ (x = 0, 0.03, 0.05; M = Sm, La) and Measurement of Ionic Conductivity at Intermediate Temperatures




Abstract: The production of electrolytes of ceria doped with aliovalent elements of the group of rare earths, such as Gd, La and Sm, presents an advantage with respect to the electrolytes of yttria-stabilized zirconia (YSZ), since it has been shown that these systems are capable of having better conductivity at temperatures below 1000 °C. In the present work, ceramic powders of Ce0.85- xGd0.15MxO2-δ (x = 0, 0.03, and 0.05; M = Sm or La) were elaborated by means of chemical synthesis by co-precipitation, which allows to obtain nano-sized materials,17.1 nm, and highly crystalline at room temperature. The electrolytes were then prepared using a uniaxial press and subjected to conventional sintering cycle in air reaching densities up to 81.90% and conductivity of 0.1573 S cm-1 at 900 °C. The goal for the future is the application of powders for the preparation of nanostructured electrolytes by means of the cathodic erosion technique.

Authors: K.M. Rangel-Arreola, E.A. Aguilar-Reyes, and C.A. León-Patiño

Keywords: Codoped ceria, SOFC electrolyte, Ionic conductivity

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10 pages


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