Influence of Mo-doping on structure and oxygen permeation properties of SrCo0.8−xFe0.2MoxO3-Δ perovskite membranes for oxygen separation

O. A. Bragina, A. P. Nemudry

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The effect of cobalt substitution by highly charged Mo6+ cations in SrCo0.8Fe0.2O3-δ (SCF) on the structure, microstructure, oxygen permeation performance and stability in the atmosphere containing carbon dioxide was systematically investigated by XRD, HT-XRD, Mossbauer spectroscopy, oxygen release technique and oxygen permeation experiments. The decrease in oxygen stoichiometry of SrCo0.8-xFe0.2MoxO3-δ (SCFM) materials was accompanied by nanostructuring with observed formation of nanosized domains with ordered oxygen vacancies. Equilibrium “3−δ−lg pO2−T” diagrams showed that SCF doping by molybdenum leads to broadening of the P1 (cubic perovskite phase) stability region. The obtained SCFM membrane materials possess improved phase stability in the intermediate temperature range (T < 700 °C) and low oxygen partial pressure (pO2 < 0.06 atm) compared to the undoped SCF oxide. The observed non-Arrhenius dependence of oxygen fluxes across SCFM disc membranes is related to combined control by bulk diffusion and surface exchange reactions.

Original languageEnglish
Pages (from-to)313-319
Number of pages7
JournalJournal of Membrane Science
Volume539
DOIs
Publication statusPublished - 1 Oct 2017

Keywords

  • Ceramic membrane
  • Doping
  • Mixed conductor
  • Oxygen permeation
  • Perovskite
  • OXIDE
  • PERMEABILITY
  • CONVERSION
  • STABILITY
  • FEATURES
  • TRANSPORT
  • METHANE
  • TRANSITIONS
  • CATALYSTS
  • COBALT

Fingerprint

Dive into the research topics of 'Influence of Mo-doping on structure and oxygen permeation properties of SrCo<sub>0.8−x</sub>Fe<sub>0.2</sub>Mo<sub>x</sub>O<sub>3-Δ</sub> perovskite membranes for oxygen separation'. Together they form a unique fingerprint.

Cite this