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

被引：10

作者：

Gurauskis, Jonas ^{[1
]}

Lohne, Orjan Fossmark ^{[1
]}

Lagergren, Dan Straete ^{[1
]}

Wefring, Espen Tjomneland ^{[1
]}

Wiik, Kjell ^{[1
]}

机构：

[1] Norwegian Univ Sci & Engn, Dept Mat Sci & Engn, Sem Saelandsvei 12, NO-7491 Trondheim, Norway

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2016年 / 36卷 / 06期

关键词：

Oxygen permeation; Perovskite; Asymmetric membrane; Surface modification; Stability; CERAMIC MEMBRANES; SURFACE; SEPARATION; TI; LA0.2SR0.8FE0.8B0.2O3-DELTA; PERMEABILITY; STABILITY; METHANE; TA;

D O I：

10.1016/j.jeurceramsoc.2016.01.004

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

L0.2Sr0.8Fe0.8Ta0.2O3-delta (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 degrees 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 H-2-mixtures was introduced on the permeate side, which was rationalized by the effect of H2O-diffusion across a gas film layer. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：1427 / 1434

页数：8

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