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.
|
Statistics for this ePrint Item |
| 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 |
Actions (login required)
 |
Archive Repository Staff Only |