Author(s)

Marina S. Bellora^1,2, Joaquín Sacanell^2,3*, Cristián Huck-Iriart¹, Analía L. Soldati³, Susana A. Larrondo^4,5, Diego G. Lamas¹

¹CONICET/Laboratorio de Cristalografía Aplicada, Escuela de Ciencia y Tecnología, Universidad Nacional de General San Martín, San Martín, Argentina.
²Departamento de Física de la Materia Condensada, Gerencia de Investigación y Aplicaciones, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, San Martín, Argentina.
³Instituto de Nanociencia y Nanotecnología (INN), CNEA-CONICET, San Martín and San Carlos de Bariloche, Argentina.
⁴UNIDEF-CONICET-MINDEF, Departamento de Investigaciones en Sólidos, CITEDEF, Villa Martelli, Argentina.
⁵Instituto de Investigación e Ingeniería Ambiental, Universidad Nacional de General San Martín, San Martín, Argentina.

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.

Crystallite Size, CeO₂-Based Nanomaterials, Sm₂O₃

Bellora, M. , Sacanell, J. , Huck-Iriart, C. , Soldati, A. , Larrondo, S. and Lamas, D. (2019) Temperature-Programmed Reduction and Dispersive X-Ray Absorption Spectroscopy Studies of CeO₂-Based Nanopowders for Intermediate-Temperature Solid-Oxide Fuel Cell Anodes. Materials Sciences and Applications, 10, 631-642. doi: 10.4236/msa.2019.1010045.