6533b7d2fe1ef96bd125e15a

RESEARCH PRODUCT

Ceria-based electrolytes prepared by solution combustion synthesis: The role of fuel on the materials properties

Leonarda F. LiottaChiara AliottaV. La ParolaEliana N. S. MuccilloAntonino MartoranaFrancesca DeganelloR. Muccillo

subject

Thermogravimetric analysisMaterials scienceScanning electron microscopeInorganic chemistrySintering02 engineering and technology010402 general chemistry01 natural sciencesCatalysisCatalysiSpecific surface areaTemperature-programmed reductionSolution combustion synthesiGeneral Environmental ScienceIT-SOFC2300Reducing atmosphereProcess Chemistry and TechnologySamarium doped ceria021001 nanoscience & nanotechnologyMicrostructureSintering in reducing atmosphere0104 chemical sciencesDielectric spectroscopyIT-SOFC; Reducibility; Samarium doped ceria; Sintering in reducing atmosphere; Solution combustion synthesis; Catalysis; 2300; Process Chemistry and TechnologyChemical engineeringSolution combustion synthesisSettore CHIM/03 - Chimica Generale E Inorganica0210 nano-technologyReducibility

description

Ce0.8Sm0.2O2 − xpowders were synthesized by solution combustion synthesis using citric acid, cellulose and sucrose as single, or intimately mixed, fuels. The powders were characterized by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, N2sorption at −196 °C, H2-temperature programmed reduction and thermogravimetric analyses. Textural properties of the powders were shaped by the peculiar employed fuel. The study of reducibility revealed that oxygen vacancies formation is mainly influenced by both parameters, specific surface area and total pore volume. The different tendency toward reduction played a key role in sintering under reducing atmosphere (4% H2/Ar), and Ce0.8Sm0.2O2 − xprepared with sucrose showed, at scanning electron microscopy images, the highest average grain size. Impedance spectroscopy experiments in air disclosed different grain boundary resistances on the basis of synthesis fuel employed and, in particular, Ce0.8Sm0.2O2 − xprepared with sucrose exhibited the best electrical performance. Solution combustion synthesis thereby was able to tailor the morphological and reduction properties of Ce0.8Sm0.2O2 − xpowders affecting even the microstructure of sintered pellet.

yearjournalcountryeditionlanguage
2016-11-01
10.1016/j.apcatb.2016.02.044http://hdl.handle.net/10447/278268