Oxygen permeation in symmetric and asymmetric La0.2Sr0.8Fe0.8Ta0.2O3 - δ membranes

Jonas Gurauskis, Ørjan Fossmark Lohne, Dan Stræte Lagergren, Espen Tjønneland Wefring, Kjell Wiik

Research output: Contribution to journalJournal articleResearchpeer-review


La0.2Sr0.8Fe0.8Ta0.2O3 - δ (LSFT) is a mixed ionic electronic conductor (MIEC) at elevated temperatures and as such a candidate material for applications both in syn-gas synthesis and as electrodes in solid oxide fuel cells (SOFC). This study addresses the variation in oxygen permeation rates for LSFT symmetric- and asymmetric-membranes at temperatures between 800 and 1000 °C with and without surface modification. The surface was structured in two different scales, macro (porous LSFT-layer) and micro (acid etching). The asymmetric membranes showed a significant variation in permeation rate with surface treatment with increasing rate in the sequence from non-treated to macro-structured and finally micro structured, corresponding to oxygen permeation being controlled by surface exchange and gas diffusion. It was found that the permeation rate was sensitive to the gas sweep rate when H2-mixtures was introduced on the permeate side, which was rationalized by the effect of H2O-diffusion across a gas film layer.
Original languageEnglish
JournalJournal of the European Ceramic Society
Issue number6
Pages (from-to)1427-1434
Number of pages8
Publication statusPublished - 2016
Externally publishedYes


  • Asymmetric membrane
  • Oxygen permeation
  • Perovskite
  • Stability
  • Surface modification


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