Core-shell Fe2O3@La1−xSrxFeO3−δ material for catalytic oxidations: Coverage of iron oxide core, oxygen storage capacity and reactivity of surface oxygens

Hen Ohayon Dahan, Miron V. Landau, Roxana Vidruk Nehemya, Eran Edri, Moti Herskowitz, Chongyan Ruan, Fanxing Li

Research output: Contribution to journalArticlepeer-review

Abstract

A series of Fe2O3@LSF (La0.8Sr0.2FeO3−δ perovskite) core-shell materials (CSM) was prepared by infiltration of LSF precursors gel containing various complexants and their mixtures to nanocrystalline aggregates of hematite followed by thermal treatment. The content of LSF phase and amount of carboxyl groups in complexant determine the percent coverage of iron oxide core with the LSF shell. The most conformal coating core-shell material was prepared with citric acid as the complexant, contained 60 wt% LSF with 98% core coverage. The morphology of the CSM was studied by HRTEM-EELS combined with SEM-FIB for particles cross-sections. The reactivity of surface oxygen species and their amounts were determined by H2-TPR, TGA-DTG, the oxidation state of surface oxygen ions by XPS. It was found that at complete core coverage with perovskite shell, the distribution of surface oxygen species according to redox reactivity in CSM resemble pure LSF, but its lattice oxygen storage capacity is 2–2.5 times higher. At partial coverage, the distribution of surface oxygen species according to redox reactivity resembles that in iron oxide.

Original languageAmerican English
Article number7355
JournalMaterials
Volume14
Issue number23
DOIs
StatePublished - 1 Dec 2021

Keywords

  • Core-shell morphology
  • Iron oxide
  • Lanthanum iron strontium perovskite
  • Reactive oxygen species

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • General Materials Science

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