Properties and performance of A-site deficient (Ba0.5Sr0.5)1−xCo0.8Fe0.2O3−δ for oxygen permeating membrane

Ge, Lei and Zhou, Wei and Ran, Ran and Liu, Shaomin and Shao, Zongping and Jin, Wanqin and Xu, Nanping (2007) Properties and performance of A-site deficient (Ba0.5Sr0.5)1−xCo0.8Fe0.2O3−δ for oxygen permeating membrane. Journal of Membrane Science, 306 (1-2). pp. 318-328. ISSN 0376-7388

Abstract

(Ba0.5Sr0.5)1-xCo0.8Fe0.2O3-δ (BSCF) (x = 0-0.3) oxides were prepared by a combined EDTA-citrate complexing method. The crystal structure, electrical conductivity, sintering behavior and oxygen desorption property of the oxides were studied by X-ray diffraction (XRD), four-probe direct current (DC) conductivity, environmental scanning electron microscopy (ESEM) and oxygen temperature-programmed desorption (O2-TPD) technologies, respectively. At x = 0.0-0.15, BSCF had a cubic perovskite structure, the lattice parameter and electrical conductivity both decreased steadily with increasing A-site deficiency. The A-site deficiency resulted in the increasing oxygen vacancy concentration in the lattice structure and improved the sintering of the oxides. BSCF (x = 0.03) showed the highest oxygen permeability with the flux reaching 3.5 × 10-6 mol cm-2 s-1 [STP: standard temperature and pressure] at 900 °C through a 1.0 mm thickness membrane. Long-term stability test of BSCF (x = 0.03) membrane at 850 °C indicated a slight deterioration of the permeation flux, which was attributed in part to the increased A-site deficiency of the bulk from Ba2+ and Sr2+ segregation over the membrane surface.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version, in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 07 Aug 2019 00:28
Last Modified: 12 Aug 2019 02:07
Uncontrolled Keywords: oxygen separation; mixed conducting; (Ba0.5Sr0.5)1−xCo0.8Fe0.2O3−δ; deficiency; inorganic membrane
Fields of Research : 03 Chemical Sciences > 0302 Inorganic Chemistry > 030206 Solid State Chemistry
09 Engineering > 0904 Chemical Engineering > 090404 Membrane and Separation Technologies
Socio-Economic Objective: B Economic Development > 86 Manufacturing > 8606 Industrial Chemicals and Related Products > 860601 Industrial Gases
Identification Number or DOI: 10.1016/j.memsci.2007.09.004
URI: http://eprints.usq.edu.au/id/eprint/36464

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