English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  B-site La-doped BaFe0.95−xLaxZr0.05O3−δ perovskite-type membranes for oxygen separation

Liang, F., Partovi, K., Jiang, H., Luo, H., & Caro, J. (2013). B-site La-doped BaFe0.95−xLaxZr0.05O3−δ perovskite-type membranes for oxygen separation. Journal of Materials Chemistry A; Materials for energy and sustainability, 1(3), 746-751. doi:10.1039/C2TA00377E.

Item is

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Liang, Fangyi1, Author
Partovi, Kaveh1, Author
Jiang, Heqing2, Author              
Luo, Huixia1, Author
Caro, Jürgen1, Author
Affiliations:
1Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstr. 3A, D-30167 Hannover, Germany, ou_persistent22              
2Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, DE, ou_1445589              

Content

show
hide
Free keywords: -
 Abstract: Partial La-substitution for Fe on the B-site of the perovskite BaFe0.95−xLaxZr0.05O3−δ (BFLZ) was achieved by applying a sol–gel synthesis method. The highest La content in BFLZ for the formation of a pure cubic perovskite structure without any detectable impurities is about x = 0.04. It is found for the first time that the introduction of La on the B-site of a mixed oxide stabilizes the cubic structure. Furthermore, the formation of the cubic structure of BFLZ increases significantly the oxygen permeability. The maximum oxygen permeation flux is found for a La-content of x = 0.04 with the largest volume of the cubic unit cell, reaching 0.63 and 1.24 cm3 (STP) min−1 cm−2 for a 1.1 mm thick membrane at 750 and 950 °C, respectively. This finding is in complete agreement with the XRD structure analysis, showing that the highest B-site La-substitution of BFLZ under conservation of the pure cubic perovskite phase without forming any foreign phase was about x = 0.04. For BFLZ with x > 0.04, the secondary phase Ba6La2Fe4O15 forms increasingly and the oxygen permeation flux decreases. The influence of the sweep gas flow rates on the oxygen permeation flux and the oxygen ionic conductivity were found to be in good agreement with the Wagner theory, indicating the oxygen ion bulk diffusion as a rate-limiting step of oxygen transport. Stable oxygen permeation fluxes were obtained during the long-term oxygen permeation operation of the BFLZ (x = 0.04) membrane over 170 h at 750 and 950 °C, respectively.

Details

show
hide
Language(s):
 Dates: 2012-10-252013
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1039/C2TA00377E
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Journal of Materials Chemistry A; Materials for energy and sustainability
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Royal Society of Chemistry
Pages: - Volume / Issue: 1 (3) Sequence Number: - Start / End Page: 746 - 751 Identifier: -