La0.2Sr0.8Fe0.8Ta0.2O3 - δ based thin film membranes with surface modification for oxygen production

Jonas Gurauskis, Ørjan F. Lohne, Kjell Wiik

Research output: Contribution to journalConference articleResearchpeer-review

Abstract

High temperature dense ceramic membranes made from mixed ionic/electronic conducting perovskite ceramics represent a high potential as a reliable source for oxygen and syngas production. In this work, La0.2Sr 0.8Fe0.8Ta0.2O3 - δ based thin film perovskite system was evaluated, addressing the effect of structural surface modification on oxygen permeation rates. Membranes with ∼ 20 μm thick dense functional layer and varying surface area on permeate side were fabricated by a dip coating technique. Oxygen permeation was measured at temperatures between 800 and 1000 °C by using varying partial pressure of O2 as a driving force. Maximum O2 flux values of ∼ 5.8 and ∼ 8.7 ml·cm- 2·min- 1 were recorded for smooth and structured permeation surfaces, respectively. This indicates that the surface roughness, which corresponds to an increase in surface area at the permeate side; can lead to a significant improvement in oxygen permeation rates reaching ∼ 50% at 1000 °C. © 2012 Elsevier B.V.
Original languageEnglish
JournalSolid State Ionics
Volume225
Pages (from-to)703-706
ISSN0167-2738
DOIs
Publication statusPublished - 2012
Externally publishedYes

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