Composite electrolyte membranes for high temperature CO2 separation

Jennifer L. Wade, Catherine Lee, Alan C. West, Klaus S. Lackner

Research output: Contribution to journalArticlepeer-review

121 Scopus citations


A membrane device that can selectively separate CO2 at temperatures exceeding 600°C has been demonstrated. The membrane can be made from a composite material made of a molten carbonate electrolyte that fills the pore space in a solid oxide electrolyte (e.g. yttria doped zirconia (YSZ), or gadolinia doped ceria (CGO)). The experimental evidence points to a transport mechanism based on opposing ionic currents of carbonate and oxide ions. The flux of CO2 across these membranes has been shown to increase with temperature, reaching permeabilities of 10-11molm-1s-1Pa-1 (or permeance of 3×10-8molm-2s-1Pa-1) at 850°C. The use of a non-ion conducting solid oxide, Al2O3, does not result in strong CO2 permeability or selectivity, supporting a facilitated dual-ion transport mechanism.

Original languageEnglish (US)
Pages (from-to)20-29
Number of pages10
JournalJournal of Membrane Science
Issue number1-2
StatePublished - Mar 1 2011
Externally publishedYes


  • CO separation
  • Carbon capture
  • Dual-ion membrane

ASJC Scopus subject areas

  • Biochemistry
  • General Materials Science
  • Physical and Theoretical Chemistry
  • Filtration and Separation


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