Hydrogen-permeation characteristics of a SrCeO3-based ceramic separation membrane: Thermal, ageing and surface-modification effects

Glenn C. Mather*, Danai Poulidi, Alan Thursfield, María Jesús Pascual, José Ramón Jurado, Ian S. Metcalfe

*Corresponding author for this work

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Dense ceramics with mixed protonic-electronic conductivity are of considerable interest for the separation and purification of hydrogen and as electrochemical reactors. In this work, the hydrogen permeability of a Sr0.97Ce0.9Yb0.1O3 - δ (SCYb) membrane with a porous Pt catalytic layer on the hydrogen feed-exposed side has been studied over the temperature range 500-804 °C employing Ar as the permeate sweep gas. A SiO2-B2O3-BaO-MgO-ZnO-based glass-ceramic sealant was successfully employed to seal the membrane to the dual-chamber reactor. After 14 h of exposure to 10% H2:90% N2 at 804 °C, the H2 flux reached a maximum of 33 nmol cm- 2 s- 1, over an order of magnitude higher than that obtained on membranes of similar thickness without surface modification. The permeation rate then decreased slowly and moderately on annealing at 804 °C over a further 130 h. Thereafter, the flux was both reproducible and stable on thermal cycling in the range 600-804 °C. The results indicate an important role of superficial activation processes in the flux rate and suggest that hydrogen fluxes can be further optimised in cerate-based perovskites.

Original languageEnglish
Pages (from-to)230-235
Number of pages6
JournalSolid State Ionics
Volume181
Issue number3-4
DOIs
Publication statusPublished - 24 Feb 2010

Keywords

  • Glass-ceramic seal
  • Hydrogen permeation
  • Hydrogen-separation membrane
  • Perovskite
  • Protonic-electronic conduction
  • SrCeO
  • Thermal history

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Chemistry(all)

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