Electric transport and oxygen permeation properties of lanthanum cobaltite membranes synthesized by different methods

Xiwang Qi, Jerry Lin, S. L. Swartz

Research output: Contribution to journalArticle

62 Citations (Scopus)

Abstract

Dense perovskite-structured membranes with desired composition of La0.8Sr0.2Co0.6Fe0.4O(3-δ) (LSCF) were prepared from powders produced by four different methods. LSCF powders prepared by citrate, solid- state, and spray-pyrolysis methods had compositions close to the desired stoichiometry with a slight difference in cobalt concentration, whereas coprecipitated powders had a large strontium deficiency. The membrane composition was a determining factor that affected the electronic conductivity and therefore oxygen permeability. The membrane with a large strontium deficiency had much lower electronic conductivity and oxygen permeability (ionic conductivity) than the other three membranes with compositions close to the desired stoichiometry. The electronic conductivity of membranes prepared from citrate, solid-state, and spray - pyrolysis methods increases with the cobalt concentration of the membrane. For the three membranes with similar composition, the activation energy of oxygen flux decreases with increasing grain size. Oxygen pressure dependency of oxygen vacancy concentration is also influenced by the membrane microstructure and composition. LSCF membranes with same composition and similar microstructure should have similar electric and oxygen transport properties.

Original languageEnglish (US)
Pages (from-to)646-653
Number of pages8
JournalIndustrial and Engineering Chemistry Research
Volume39
Issue number3
StatePublished - 2000
Externally publishedYes

Fingerprint

cobaltite
Lanthanum
Permeation
Oxygen
membrane
Membranes
oxygen
Chemical analysis
conductivity
Powders
Strontium
Spray pyrolysis
stoichiometry
Cobalt
strontium
Citric Acid
cobalt
Stoichiometry
pyrolysis
spray

ASJC Scopus subject areas

  • Polymers and Plastics
  • Environmental Science(all)
  • Chemical Engineering (miscellaneous)

Cite this

Electric transport and oxygen permeation properties of lanthanum cobaltite membranes synthesized by different methods. / Qi, Xiwang; Lin, Jerry; Swartz, S. L.

In: Industrial and Engineering Chemistry Research, Vol. 39, No. 3, 2000, p. 646-653.

Research output: Contribution to journalArticle

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