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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
CONICET/Laboratorio de Cristalografía Aplicada, Escuela de Ciencia y Tecnología, Universidad Nacional de General San Martín, San Martín, Argentina
Departamento de Física de la Materia Condensada, Gerencia de Investigación y Aplicaciones, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, San Martín, Argentina
CONICET/Laboratorio de Cristalografía Aplicada, Escuela de Ciencia y Tecnología, Universidad Nacional de General San Martín, San Martín, Argentina
Instituto de Nanociencia y Nanotecnología (INN), CNEA-CONICET, San Martín and San Carlos de Bariloche, Argentina
UNIDEF-CONICET-MINDEF, Departamento de Investigaciones en Sólidos, CITEDEF, Villa Martelli, Argentina
CONICET/Laboratorio de Cristalografía Aplicada, Escuela de Ciencia y Tecnología, Universidad Nacional de General San Martín, San Martín, Argentina
Instituto de Investigación e Ingeniería Ambiental, Universidad Nacional de General San Martín, San Martín, Argentina
- 1 CONICET/Laboratorio de Cristalografía Aplicada, Escuela de Ciencia y Tecnología, Universidad Nacional de General San Martín, San Martín, Argentina
- 2 Departamento de Física de la Materia Condensada, Gerencia de Investigación y Aplicaciones, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, San Martín, Argentina
- 3 CONICET/Laboratorio de Cristalografía Aplicada, Escuela de Ciencia y Tecnología, Universidad Nacional de General San Martín, San Martín, Argentina
- 4 Instituto de Nanociencia y Nanotecnología (INN), CNEA-CONICET, San Martín and San Carlos de Bariloche, Argentina
- 5 UNIDEF-CONICET-MINDEF, Departamento de Investigaciones en Sólidos, CITEDEF, Villa Martelli, Argentina
- 6 CONICET/Laboratorio de Cristalografía Aplicada, Escuela de Ciencia y Tecnología, Universidad Nacional de General San Martín, San Martín, Argentina
- 7 Instituto de Investigación e Ingeniería Ambiental, Universidad Nacional de General San Martín, San Martín, Argentina
Materials Sciences and Applications·Volume 10 (2019)·Pages 631–642·Published 16 October 2019·DOI10.4236/msa.2019.1010045
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Abstract
In this work, we study the influence of the average crystallite size and dopant oxide on the reducibility of CeO 2 -based nanomaterials. Samples were prepared from commercial Gd 2 O 3 -, Sm 2 O 3 - and Y 2 O 3 -doped CeO 2 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 Gd 2 O 3 -doped ceria materials display higher reducibility than Sm 2 O 3 - and Y 2 O 3 -doped CeO 2 .
KeywordsCrystallite SizeCeO<sub>2</sub>-Based NanomaterialsSm<sub>2</sub>O<sub>3</sub>
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