Search results for " ceria"

showing 2 items of 12 documents

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

2016

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 atmosphe…

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
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Cation Diffusion and Segregation at the Interface between Samarium-Doped Ceria and LSCF or LSFCu Cathodes Investigated with X-ray Microspectroscopy

2017

The chemical compatibility between electrolytes and electrodes is an extremely important aspect governing the overall impedance of solid-oxide cells. Because these devices work at elevated temperatures, they are especially prone to cation interdiffusion between the cell components, possibly resulting in secondary insulating phases. In this work, we applied X-ray microspectroscopy to study the interface between a samarium-doped ceria (SDC) electrolyte and lanthanum ferrite cathodes (La0.4Sr0.6Fe0.8Cu0.2O3(LSFCu); La0.9Sr0.1Fe0.85Co0.15O3(LSCF)), at a submicrometric level. This technique allows to combine the information about the diffusion profiles of cations on the scale of several micromet…

cathodeMaterials scienceAbsorption spectroscopyX-ray microspectroscopychemistry.chemical_element02 engineering and technologyElectrolyteelectrolytecompatibility010402 general chemistry01 natural scienceslaw.inventioninterfaceslawsamarium-doped ceriaLanthanumGeneral Materials ScienceSOFCCation diffusionDoping021001 nanoscience & nanotechnologyXANESCathodeXANES0104 chemical sciencesceriaSamariumCeriumchemistryChemical engineeringMaterials Science (all)0210 nano-technologycathodes
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