X-ray Spectroscopy of (Ba,Sr,La)(Fe,Zn,Y)O3-δIdentifies Structural and Electronic Features Favoring Proton Uptake

Francesco Giannici, Antonino Martorana, Rotraut Merkle, Joachim Maier, Giulia Raimondi, Maximilian F. Hoedl, Alessandro Longo, Alessandro Chiara

Risultato della ricerca: Articlepeer review

1 Citazioni (Scopus)

Abstract

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.
Lingua originaleEnglish
pagine (da-a)8502-8511
Numero di pagine10
RivistaChemistry of Materials
Volume32
Stato di pubblicazionePublished - 2020

All Science Journal Classification (ASJC) codes

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  • ???subjectarea.asjc.1500.1500???
  • ???subjectarea.asjc.2500.2505???

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