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RESEARCH PRODUCT
X-ray Spectroscopy of (Ba,Sr,La)(Fe,Zn,Y)O3-δIdentifies Structural and Electronic Features Favoring Proton Uptake
Maximilian F. HoedlAlessandro LongoAntonino MartoranaFrancesco GianniciGiulia RaimondiJoachim MaierAlessandro ChiaraRotraut Merklesubject
X-ray spectroscopyMaterials scienceProtonGeneral Chemical Engineeringchemistry.chemical_element02 engineering and technologyGeneral Chemistry010402 general chemistry021001 nanoscience & nanotechnology01 natural sciencesOxygen0104 chemical sciencesExtended X ray absorption fine structure spectroscopy Functional materials Iron OxygenPerovskite Protonic ceramic fuel cells (PCFC) X ray absorptionCrystallographychemistryvisual_artMaterials Chemistryvisual_art.visual_art_mediumFuel cellsCeramicAbsorption (chemistry)0210 nano-technologydescription
Mixed protonic–electronic conducting oxides are key functional materials for protonic ceramic fuel cells. Here, (Ba,Sr,La)(Fe,Zn,Y)O3−δ perovskites are comprehensively investigated by X-ray spectroscopy (in oxidized and reduced states). Extended X-ray absorption fine structure shows that Zn,Y doping strongly increases the tendency for Fe–O–Fe buckling. X-ray absorption near-edge spectroscopy at the Fe K-edge and X-ray Raman scattering at the O K edge demonstrate that both iron and oxygen states are involved when the samples are oxidized, and for the Zn,Y doped materials, the hole transfer from iron to oxygen is less pronounced. This can be correlated with the observation that these materials show the highest proton uptake.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2020-09-11 |