Effects of Nb and Sn co-doping on the structure and properties of SrCoO3-delta oxygen transport membranesopen access
- Authors
- Park, Jong Hyun; Lee, Young A.; Yu, Ji Haeng; Lee, June Hyuk; Yoon, Hana; Cho, Younghyun; Yoo, Chung-Yul
- Issue Date
- 2-Apr-2020
- Publisher
- Elsevier | The Ceramic Society of Japan and the Korean Ceramic Society
- Keywords
- Perovskites; neutron powder diffraction; X-ray photoelectron spectroscopy; oxygen permeation; co-doping
- Citation
- Journal of Asian Ceramic Societies, v.8, no.2, pp 519 - 527
- Pages
- 9
- Journal Title
- Journal of Asian Ceramic Societies
- Volume
- 8
- Number
- 2
- Start Page
- 519
- End Page
- 527
- URI
- https://scholarworks.bwise.kr/sch/handle/2021.sw.sch/2918
- DOI
- 10.1080/21870764.2020.1756066
- ISSN
- 2187-0764
- Abstract
- 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.
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