Improving the oxygen permeability of Ba0.5Sr0.5Co0.8Fe0.2O3−δ membranes by a surface-coating layer of GdBaCo2O5+δ

✍ Scribed by Yingfang Wang; Haoshan Hao; Jianfeng Jia; Delin Yang; Xing Hu

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 591 KB
• Volume: 28
• Category: Article
• ISSN: 0955-2219
• DOI: 10.1016/j.jeurceramsoc.2007.12.031

✦ Synopsis

A GdBaCo 2 O 5+δ layer was coated on the Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ membranes to enhance their oxygen permeability by employing the fast oxygen adsorption/desorption surface-exchange properties of the GdBaCo 2 O 5+δ material. The oxygen flux of the coated and uncoated Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ membranes was measured in the temperature range of 600-850 • C. The results reveal that the oxygen-permeation flux of the Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ membranes coated by a GdBaCo 2 O 5+δ layer shows significant enhancement. The GdBaCo 2 O 5+δ layer coated on the oxygen desorption side (He side) has much effect than that coated on the oxygen adsorption side (air side). At 850 • C, the oxygen flux with a single coating layer on the air side can rise 16%, while a single coating on the helium side will result into a rise of 23%.