Effects of surface modification on the oxygen permeation of Ba0.5Sr0.5Co0.8Fe0.2O3-δ membrane

Yoshiaki Hayamizu, Manami Kato, Hitoshi Takamura

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

The surface of Ba0.5Sr0.5Co0.8Fe0.2O3 -δ (BSCF) membrane was modified by the addition of a porous layer in order to improve the oxygen permeation properties of this material. At 700°C, the oxygen permeation rate of a 120 μm-thick BSCF sample with a 6.5 μm-thick porous layer was 3.6 times that of a similar sample with no surface layer. An estimation of the surface area of the applied porous layer indicated that only the 1.1 μm of the porous layer nearest the membrane had an effect on the oxygen permeation rate. Weight relaxation was performed at 400°C to clarify the enhancement of the surface exchange reaction. The chemical surface exchange coefficient (kchem) was 3.1 times larger for the sample with the porous layer coating. The thickness of the porous layer affecting the oxygen permeation rate was estimated by the transmission line model by Dchem and kchem.

Original languageEnglish
Pages (from-to)147-152
Number of pages6
JournalJournal of Membrane Science
Volume462
DOIs
Publication statusPublished - 2014 Jul 15

Keywords

  • MIEC
  • Oxygen permeable membrane
  • Surface kinetics
  • Surface modification

ASJC Scopus subject areas

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

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