Oxygen Permeation through La0.4Sr0.6Co0.2Fe0.8O3- Membrane
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- 作者：Chu-sheng Chen ; Zhan-ping Zhang ; Guo-sun Jiang ; Chuan-gang Fan ; Wei Liu ; and Henny J. M. Bouwmeester
- 刊名：Chemistry of Materials
- 出版年：2001
- 出版时间：September 2001
- 年：2001
- 卷：13
- 期：9
- 页码：2797 - 2800
- 全文大小：58K
- 年卷期：v.13,no.9(September 2001)
- ISSN：1520-5002
文摘
Dense La0.4Sr0.6Co0.2Fe0.8O3-
oxygen-permeable membranes of different thickness wereprepared by solid-state reaction. The oxygen flux facilitated by an oxygen partial pressuredifference across the oxide membrane was measured at elevated temperatures. It is revealedthat oxygen permeation flux is entirely controlled by the transport of oxide ions in the bulkof the membrane in the thickness range of 1.25-2.46 mm. When the thickness is decreasedto 0.62 mm, it becomes jointly controlled by the oxygen exchange across the gas and solidinterfaces. An electrochemical approach is adopted to analyze the thickness dependence ofthe oxygen flux. It is shown that the interfacial process is more sensitive to the change oftemperature, as evidenced by the larger activation energy for the surface oxygen exchange(188.2 ± 2.2 kJ mol-1), than that for the bulk transport (93.7 ± 1.7 kJ mol-1).
oxygen-permeable membranes of different thickness wereprepared by solid-state reaction. The oxygen flux facilitated by an oxygen partial pressuredifference across the oxide membrane was measured at elevated temperatures. It is revealedthat oxygen permeation flux is entirely controlled by the transport of oxide ions in the bulkof the membrane in the thickness range of 1.25-2.46 mm. When the thickness is decreasedto 0.62 mm, it becomes jointly controlled by the oxygen exchange across the gas and solidinterfaces. An electrochemical approach is adopted to analyze the thickness dependence ofthe oxygen flux. It is shown that the interfacial process is more sensitive to the change oftemperature, as evidenced by the larger activation energy for the surface oxygen exchange(188.2 ± 2.2 kJ mol-1), than that for the bulk transport (93.7 ± 1.7 kJ mol-1).