Journal article
Yttrium doped BSCF membranes for oxygen separation
University of Queensland1
Electroceramics, Fuel Cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark2
Fuel Cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark3
Risø National Laboratory for Sustainable Energy, Technical University of Denmark4
This work investigates the partial substitution of yttrium in place of iron in BSCF to form Ba0.5Sr0.5Co0.8Fe0.2−xYxO3−δ, where x varied between 0 and 0.2. X-ray diffraction patterns showed the formation of a perovskite cubic phase structure up to x = 0.15, whilst the full substitution of yttrium (x = 0.2) for iron resulted in a non-cubic crystal structure that did not exhibit oxygen permeation.
The yttrium partial substitution in BSCFY discs (1.2 mm thick) delivered best results for x = 0.025, as oxygen fluxes reached 2.05 ml cm−2 min−1 at 900 °C, an increase of 160% as compared to a blank BSCF (x = 0) membrane. This was attributed to the combined effect of the formation of a greater number of oxygen vacancies, together with improved ion mobility, associated with the beneficial yttrium substitution into the BSCF perovskite structure which stemmed from the crystal lattice expansion.
Language: | English |
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Year: | 2011 |
Pages: | 88-93 |
ISSN: | 18733794 and 13835866 |
Types: | Journal article |
DOI: | 10.1016/j.seppur.2011.07.007 |