Temperature-Programmed Reduction and Dispersive X-Ray Absorption Spectroscopy Studies of CeO₂-Based Nanopowders for Intermediate-Temperature Solid-Oxide Fuel Cell Anodes  

作　　者：Marina S. Bellora[1] Joaquí n Sacanell[1] Cristiá n Huck-Iriart[1] Analí a L. Soldati[1] Susana A. Larrondo[1] Diego G. Lamas[1] 

出　　处：《Materials Sciences and Applications》2019年第10期631-642,共12页材料科学与应用期刊（英文）

摘　　要：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.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.

关 键 词：CRYSTALLITE Size CeO2-Based Nanomaterials SM2O3 

分 类 号：TB3[一般工业技术—材料科学与工程]