Oxygen permeation through fluorite-type bismuth-yttrium-copper oxide membranes

Jonghee Han, Yongxian Zeng, Y. S. Lin

Research output: Contribution to journalArticle

37 Scopus citations

Abstract

Dense Bi(1.5-x)Y0.5Cu(x)O(3-δ) membranes in fluorite phase (δ phase) with different Cu(O) concentration (x = 0.005-0.015) and thickness (1-3 mm) were prepared from corresponding powders synthesized by the Citrate method. Oxygen permeation through these membranes was studied using a high-temperature permeation system to examine the oxygen transport mechanism of the membranes. The oxygen permeation fluxes through these membranes (2 mm thick) at 800°C are in the range (5.0-9.2) x 10-9 mol/cm2s at P'(O2) of 0.21 atm and P'(O2) of 5 x 10-4 - 1 x 10-3 atm. The permeation flux is inversely proportional to the membrane thickness, indicating bulk diffusion being the rate-limiting step. The driving force for the oxygen permeation through the membranes is (P'(O2)(-1/4) - P'(O2)(1/4)). The activation energy for oxygen permeation is 136, 113 and 80 kJ/mol for the membranes with 0.25, 0.5, and 0.75 mol% CuO concentration, respectively.

Original languageEnglish (US)
Pages (from-to)235-243
Number of pages9
JournalJournal of Membrane Science
Volume132
Issue number2
DOIs
StatePublished - Sep 3 1997
Externally publishedYes

Keywords

  • Ceramic membranes
  • Electrochemistry
  • Gas and vapor permeation
  • Mixed conducting
  • Theory

ASJC Scopus subject areas

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

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