Temperature-programmed reductionand dispersive X-ray absorption spectroscopy studies of CeO2-based nanopowders for intermediate-temperature Solid-Oxide Fuel Cell anodes

MARINA BELLORA; JOAQUIN SACANELL; CHRISTIÁN HUCK-IRIART; ANALIA SOLDATI; SUSANA LARRONDO; DIEGO G. LAMAS

Materials Science and Applications

Scientific Research Publishing

Lugar: Wuhan; Año: 2019 vol. 10

2153-117X

In this work, we study the influenceof the average crystallite size and dopant oxide on the reducibility of CeO2-basednanomaterials. Samples were prepared from commercial Gd2O3-,Sm2O3- and Y2O3-doped CeO2powders by calcination at different temperatures ranging between 400 and 900ºC and characterized byX-ray powder diffraction, transmission electron microscopy and BET specificsurface area. The reducibility of the samples was analyzed bytemperature-programmed reduction and in situ dispersive X-ray absorptionspectroscopy techniques. Our results clearly demonstrate that samples treatedat lower temperatures, of smallest average crystallite size and highestspecific surface areas, exhibit the best performance, while Gd2O3-dopedceria materials display higher reducibility than Sm2O3-and Y2O3-doped CeO2.