Electrochemical vapor deposition synthesis and oxygen permeation properties of dense zirconia–yttria–ceria membranes
✍ Scribed by J Han; Y Zeng; G Xomeritakis; Y.S Lin
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 806 KB
- Volume
- 98
- Category
- Article
- ISSN
- 0167-2738
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✦ Synopsis
Thin ( , 15 mm) dense ZrO -Y O -CeO membranes with different CeO composition and membrane thickness were
deposited on porous a-alumina substrates by the EVD process using corresponding metal chlorides as the precursors. CeO 2 composition in the membrane is the same as CeCl concentration in the gas phase. The film growth rate for the EVD process 3 is about 7 mm / h. The EVD prepared ZrO -Y O -CeO membranes do not show single phase, but consist of two separate 2 2 3 2 phases: a ZrO -dominant cubic phase and a CeO -dominant cubic phase. Under present conditions (950-10508C, 2 2 P 5 0.21 atm, P 50.01 atm), oxygen permeation through the EVD prepared ZrO -Y O -CeO membranes is O (high) O (low) 2 2 3 2 2 2 limited by the bulk diffusion in the membrane. The oxygen permeability of the ZrO -Y O -CeO membranes is in the 2 2 3 2 2 11 range of 1-4310 mol / cm s, about an order of magnitude higher than that of ZrO -Y O membranes. The oxygen 2 2 3 permeation flux through the EVD prepared ZrO -Y O -CeO membrane increases with CeO composition in the film.
2 2 3 2 2