Oxygen permeability of Ce0.8Sm0.2O2-aEuroparts per thousandδ-LnBaCo2O5+δ (Ln=La, Nd, Sm, and Y) dual-phase ceramic membranes

被引：21
作者：
Chen, Ting [1 ]
Zhao, Hailei [1 ,2 ]
Xie, Zhixiang [1 ]
Xu, Nansheng [1 ]
Lu, Yao [1 ]
机构：
[1] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
[2] Beijing Key Lab New Energy Mat & Technol, Beijing 100083, Peoples R China
来源：
IONICS | 2015年 / 21卷 / 06期
关键词：
Ceria; A-site double perovskite; Composite; Oxygen permeation; Membrane; ELECTRICAL-TRANSPORT PROPERTIES; PERMEATION PROPERTIES; COMPOSITE; LNBACO(2)O(5+DELTA); TRANSITIONS; PERFORMANCE; SEPARATION; DIFFUSION; CATHODES; GD;
D O I：
10.1007/s11581-014-1327-5
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：
Ce0.8Sm0.2O2 -aEuro parts per thousand delta-LnBaCo(2)O(5 + delta) (SDC-LnBCO, Ln=La, Nd, Sm, and Y) composites were prepared and characterized as dense ceramic membranes for oxygen separation. Ce0.8Sm0.2O2 -aEuro parts per thousand delta (SDC) shows a good chemical compatibility with LaBaCo2O5 + delta (LBCO), NdBaCo2O5 + delta (NBCO), and SmBaCo2O5 + delta (SBCO), while a little of impurity is detected in the sample with YBaCo2O5 + delta (YBCO). The SDC-SBCO and SDC-YBCO samples exhibit larger grain size than SDC-LBCO and SDC-NBCO. The incorporation of SDC increases the structural stability and decreases the thermal expansion coefficient of LnBCO at high temperature. The oxygen permeation flux of SDC-LnBCO dual-phase membrane decreases with decreasing Ln(3+) radius, which is 2.57 x 10(-7), 1.58 x 10(-7), 8.05 x 10(-8), and 7.57 x 10(-8) mol cm(-2) s(-1) at 925 A degrees C for SDC-LBCO, SDC-NBCO, SDC-SBCO, and SDC-YBCO membranes, respectively. Increasing the flow rate of feeding and sweeping gas can create oxygen partial pressure gradient, and thus, increase the oxygen permeability. These results indicate that SDC-LBCO and SDC-NBCO composites are promising candidates for oxygen permeation membrane.
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页码：1683 / 1692
页数：10
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