Chemical stability of La0.6Sr0.4CoO3-δ in oxygen permeation applications under exposure to N2 and CO2

被引：22

作者：

Esposito, Vincenzo ^{[1
]}

Sogaard, Martin ^{[1
]}

Hendriksen, Peter Vang ^{[1
]}

机构：

[1] Tech Univ Denmark, Dept Energy Convers & Storage, DK-4000 Roskilde, Denmark

来源：

SOLID STATE IONICS | 2012年 / 227卷

关键词：

Perovskites; La0.6Sr0.4CoO3-delta; Oxygen Transport Membranes; SrCO3; ELECTRICAL-PROPERTIES; PEROVSKITE OXIDES; MEMBRANES; STRONTIUM; DECOMPOSITION; PERFORMANCE; NONSTOICHIOMETRY; CONDUCTIVITY; DEGRADATION; ABSORPTION;

D O I：

10.1016/j.ssi.2012.08.015

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Phase stability and chemical reactivity of (La0.6Sr0.4)(0.99)CoO3-delta (LSC64) was tested in oxidative (pO(2) = 0.21 atm) and slightly reducing conditions (pO(2) similar to 10(-5) atm), as well as in carbon dioxide (pO(2) similar to 10(-4) atm) to evaluate the material performance for oxygen separation technologies. Thin film LSC64 oxygen separation membranes (20-30 mu m) were manufactured and electrochemical performance was evaluated at a range of temperatures with either nitrogen or CO2 purged on the permeate side of the membrane. Material stability was also investigated by high temperature X-ray diffraction, TGA and conductivity measurements in air, N-2 and CO2. Under mild reduction LSC64 partly decomposes to a K2NiF4-type phase (i.e. (La,Sr)(2)CoO4), and Co-oxide, and under high pCO(2) forms SrCO3. The latter is found to impair membrane performance. Electrical properties and oxygen permeation (jO(2)) in thin membranes depend on the thermal and chemical history of the samples. A flux of 4-6 Nml min(-1) cm(-2) in the temperature range of 800-900 degrees C was demonstrated for optimized membranes and conditions. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：46 / 56

页数：11

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