Preparation of ozygen evolution layer/La0.6Ca0.4CoO3 dense membrane/porous support asymmetric structure for high-performance ozygen permeation
An asymmetric-structured membrane, in which a dense thin La0.6Ca0.4CoO3 layer of 10 μm was deposited on porous La0.6Ca0.4CoO3 support by a slurry dropping method, were tested for its oxygen permeability at 630-930℃. In order to increase the oxygen permeability, porous La0.6Ca0.4CoO3 and SrCo0.8Fe0.2O3-δ oxygen evolution layers were attached on the dense layer. It was found that the asymmetric structured membranes with the porous oxygen evolution layers showed remarkably higher oxygen permeability as compared with a conventional sintered disk-type membrane (1200 μm). This suggests that oxygen permeation through membranes of 10 μm in thickness is rate-determined by both bulk O(2-) diffusion and oxygen evolution reaction. The maximum oxygen permeability reached 4.77 cm3 (STP) min-1 cm-2 (3.54×10-6 mol cm-2 s-1) at 930℃ for the asymmetric membrane with porous La0.6Ca0.4CoO3 oxygen evolution layer of 10 μm in thickness (STP=Standard Temperature and Pressure). Further improvements in the oxygen permeability would be achieved through control of the micro-structure of the oxygen evolution layers.
Mized ionic-electronic conductor Ozygen permeation Perovskite ozide Asymmetric structure
Ken Watanabe Masayoshi Yuasa Tetsuya Kida Kengo Shimanoe Yasutake Teraoka Noboru Yamazoe
Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Japan Faculty of Engineering Sciences, Kyushu University, 6-1 Kasuga-koen, Kasuga-shi, Fukuoka 816-8580, J
国际会议
The 16th International Conference on Solid State Ionics(第十六届国际固态离子学会议)
上海
英文
1377-1381
2007-07-01（万方平台首次上网日期，不代表论文的发表时间）