Effects of Nb and Sn co-doping on the structure and properties of SrCoO3-δ oxygen transport membranes

被引：3
作者：
Park, Jong Hyun [1 ]
Lee, Young A. [1 ]
Yu, Ji Haeng [1 ]
Lee, June Hyuk [2 ]
Yoon, Hana [1 ]
Cho, Younghyun [3 ]
Yoo, Chung-Yul [4 ]
机构：
[1] Korea Inst Energy Res, Energy Convers & Storage Mat Lab, Daejeon, South Korea
[2] Korea Atom Energy Res Inst, Adv Mat Res Div, Daejeon, South Korea
[3] Soonchunhyang Univ, Dept Energy Syst Engn, Asan, South Korea
[4] Mokpo Natl Univ, Dept Chem, Muan Gun, Jeollanam Do, South Korea
来源：
JOURNAL OF ASIAN CERAMIC SOCIETIES | 2020年 / 8卷 / 02期
基金：
新加坡国家研究基金会;
关键词：
Perovskites; neutron powder diffraction; X-ray photoelectron spectroscopy; oxygen permeation; co-doping; CRYSTAL-STRUCTURE; PEROVSKITE CATHODE; NEXT-GENERATION; OXIDE; PERMEATION; REDUCTION; STABILITY; PERMEABILITY; SUBSTITUTION; SEPARATION;
D O I：
10.1080/21870764.2020.1756066
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：
The structure and oxygen permeability of SrCo0.9-xNb0.1SnxO3-delta (x = 0, 0.03, and 0.05) perovskite membranes were systematically investigated by co-doping the B-site of SrCoO3-delta oxide with Nb and Sn. Combined X-ray and neutron diffraction experiments showed that all materials crystallized in the tetragonal P4/mmm space group and that the crystal structures approached the ideal cubic perovskite structure with increasing Sn concentration. In addition, X-ray photoelectron spectra confirmed that Sn-doping increases the (Co, Nb, Sn)-O bond strengths. The impact of Sn-doping on the oxygen transport of dense SrCo0.9-xNb0.1SnxO3-delta membranes was also investigated, under air/He gradient, as a function of both temperature and membrane thickness. The results showed that the oxygen transport of SrCo0.9Nb0.1O3-delta is governed by oxygen ion diffusion, while the oxygen surface exchange reaction is the limiting process for the Sn-doped membranes, SrCo0.87Nb0.1Sn0.03O3-delta and SrCo0.85Nb0.1Sn0.05O3-delta.
引用
收藏
页码：519 / 527
页数：9
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