Novel Composite Cermet for Low-Metal-Content Oxygen Separation Membranes

Enrique Ruiz-Trejo*, Paul Boldrin, Alexandra Lubin, Farid Tariq, Sarah Fearn, Richard Chater, Stuart N. Cook, Alan Atkinson, Robert I. Gruar, Christopher J. Tighe, Jawwad Darr, Nigel P. Brandon

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

A dense composite of silver and Ce0.8Sm0.2O2-delta (Ag-CSO) was manufactured from ceramic nanopartides coated by electroless deposition of silver. At 700 degrees C, a 1-mm-thick membrane of the composite delivered an excellent oxygen permeation rate from air with a value of 0.04 mu mol cm(-2) s(-1), using argon as the sweep gas and 0.17 mu mol cm(-2) s(-1) using hydrogen. The low sintering temperature of the CSO nanoparticles allows the use of Ag rather than Pt or Pd and reduces the amount of metal needed for electronic conductivity to just 5.6 vol 96, which is lower than any value reported in the literature. Oxygen diffusivity measurements confirmed that the oxygen migration remained high in the composite, with an increase in surface exchange coefficient of three orders of magnitude over Gd-doped ceria. The ease of membrane fabrication, combined with encouraging oxygen permeation rates, demonstrate the promise of the material for high-purity oxygen separation below 700 degrees C.

Original languageEnglish
Pages (from-to)3887-3895
Number of pages9
JournalChemistry of Materials
Volume26
Issue number13
DOIs
Publication statusPublished - 8 Jul 2014

Keywords

  • GADOLINIA-DOPED CERIA
  • SURFACE EXCHANGE
  • SELF-DIFFUSION
  • TRANSPORT
  • PERMEATION
  • CERAMICS
  • OXIDES
  • REACTOR
  • SIMS
  • NANOPARTICLES

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