UNIDEF 23986
UNIDAD DE INVESTIGACION Y DESARROLLO ESTRATEGICO PARA LA DEFENSA
Unidad Ejecutora - UE
artículos
Título:
Temperature-Programmed Reduction and Dispersive X-Ray Absorption Spectroscopy Studies of CeO<sub>2</sub>-Based Nanopowders for Intermediate-Temperature Solid-Oxide Fuel Cell Anodes
Autor/es:
HUCK-IRIART, CRISTIÁN; LAMAS, DIEGO G.; BELLORA, MARINA S.; SOLDATI, ANALÍA L.; SACANELL, JOAQUÍN; LARRONDO, SUSANA A.
Revista:
Materials Sciences and Applications
Editorial:
Scientific Research Publishing
Referencias:
Año: 2019 vol. 10 p. 631 - 642
ISSN:
2153-117X
Resumen:
In this work, we study the influence of the average crystallite size and dopant oxide on the reducibility of CeO2-based nanomaterials. Samples were prepared from commercial Gd2O3-, Sm2O3- and Y2O3-doped CeO2 powders by calcination at different temperatures ranging between 400˚C and 900˚C and characterized by X-ray powder diffraction, transmission electron microscopy and BET specific surface area. The reducibility of the samples was analyzed by temperature-programmed reduction and in situ dispersive X-ray absorption spectroscopy techniques. Our results clearly demonstrate that samples treated at lower temperatures, of smallest average crystallite size and highest specific surface areas, exhibit the best performance, while Gd2O3-doped ceria materials display higher reducibility than Sm2O3- and Y2O3-doped CeO2.
