Systematic investigation on new SrCo1-yNbyO 3-δ ceramic membranes with high oxygen semi-permeability

Zhang, Kun and Ran, Ran and Ge, Lei and Shao, Zongping and Jin, Wanqin and Xu, Nanping (2008) Systematic investigation on new SrCo1-yNbyO 3-δ ceramic membranes with high oxygen semi-permeability. Journal of Membrane Science, 323 (2). pp. 436-443. ISSN 0376-7388

Abstract

SrCo1-yNbyO3-δ (y = 0.025-0.4) were synthesized for oxygen separation application. The crystal structure, phase stability, oxygen nonstoichiometry, electrical conductivity, and oxygen permeability of the oxides were systematically investigated. Cubic perovskite, with enhanced phase stability at higher Nb concentration, was obtained at y = 0.025-0.2. However, the further increase in niobium concentration led to the formation of impurity phase. The niobium doping concentration also had a significant effect on electrical conductivity and oxygen permeability of the membranes. SrCo0.9Nb0.1O3-δ exhibited the highest electrical conductivity and oxygen permeability among the others. It reached a permeation flux of ∼2.80 × 10-6 mol cm -2 s-1 at 900°C for a 1.0-mm membrane under an air/helium oxygen gradient. The further investigation demonstrated the oxygen permeation processwas mainly rate-limited by the oxygen bulk diffusion process. © 2008 Elsevier B.V. All rights reserved.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty / Department / School: No Faculty
Date Deposited: 19 Oct 2017 02:33
Last Modified: 13 Nov 2017 06:12
Uncontrolled Keywords: ceramic membrane; mixed conductor; oxygen permeation; perovskite; SrCoO3-δ; bulk diffusions; cubic perovskites; electrical conductivities; mixed conductor; niobium doping; oxygen gradients; oxygen nonstoichiometry; oxygen permeabilities; oxygen permeation; oxygen permeations; oxygen separations; permeation fluxes
Fields of Research : 03 Chemical Sciences > 0303 Macromolecular and Materials Chemistry > 030301 Chemical Characterisation of Materials
Identification Number or DOI: 10.1016/j.memsci.2008.07.002
URI: http://eprints.usq.edu.au/id/eprint/31216

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