Nanostructured YSZ thin films for solid oxide fuel cells deposited by ultrasonic spray pyrolysis
Por:
García-Sánchez M.F., Pena, J, Ortiz A., Santana G., Fandino, J, Bizarro M., Cruz-Gandarilla F., Alonso J.C.
Publicada:
1 abr 2008
Resumen:
Nanostructured thin films of yttria-stabilized zirconia (YSZ) have been prepared on single-crystalline silicon substrates by ultrasonic spray pyrolysis using zirconium acetylacetonate and yttrium acetylacetonate hydrate as metallo-organic precursors dissolved in anhydrous methanol. The morphology, structure and electrical properties were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM) and impedance spectroscopy (IS). The substrate temperature was optimized for obtaining smooth, dense and homogeneous nanocrystalline films with grains sizes as small as 10 nm. The influence of thermal annealing on structural properties of films was studied. The activation energy measured for electrical conduction through the grains (1.14 eV) was similar to that obtained in bulk of YSZ, but for conduction through the grain boundaries it acquires a value of 0.79 eV, increasing the total conductivity of the material up to 0.033 S/cm at 650 degrees C. Thes
Filiaciones:
García-Sánchez M.F.:
Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 04510, DF, Mexico
Pena, J:
Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 04510, DF, Mexico
Ortiz A.:
Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 04510, DF, Mexico
Santana G.:
Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 04510, DF, Mexico
Bizarro M.:
Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 04510, DF, Mexico
Cruz-Gandarilla F.:
Escuela Superior de Física y Matemáticas, IPN, Edif. 9, U.P.A.L.M, 07738 México D.F., Mexico
Alonso J.C.:
Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 04510, DF, Mexico
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