| Oxygen Permeation and Stability of Ce0.8Gd0.2O2-δ-PrBaCo2-xFexO5＋δ Dual-phase Composite Membranes |
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| 作者姓名： | Bo Jiang Hongwei Cheng Longfei Luo Xionggang Lu Zhongfu Zhou |
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| 作者单位： | Shanghai Key Laboratory of Modem Metallurgy and Materials Processing, School of Materials Science and Engineering,Shanghai University, Shanghai 200072, China |
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| 基金项目： | supported by the National Natural Science Foundation of China (Nos. 51004069 and 51474145);the National Science Fund for Distinguished Young Scholars (No. 51225401);the Innovation Program of Shanghai Municipal Education Commission and Shanghai University (Nos. 14YZ013 and SDCX2012002) |
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| 摘 要： | Dual-phase membranes of 60 wt% Ce0.8Gd0.2O2-δ-40 wt% Pr Ba Co2exFexO3 d（0 x 2） were prepared by a combined citrate and ethylene diamine tetraacetic acid（EDTA） complexing method. X-ray diffraction（XRD）results revealed the good chemical compatibility between ion-conducting phase CGO and electron-conducting phases PBC2 xFxO after sintering in air. The Fe ionic dopant had a significant effect on the phase structure stability and oxygen permeability under CO2 atmosphere, which was confirmed by XRD, thermogravimetrye differential scanning calorimetry（TGeD SC）, scanning electron microscopy（SEM） and oxygen permeation experiments. CGOeP BC0.5F1.5O dual-phase membrane demonstrated a stable oxygen permeation flux of2.71x10-7mol cm 2s 1with 50 mol% He/CO2 as the sweep gas at 925 C, and this value was much higher than that of perovskite-type membranes. The rate-limiting step in the oxygen permeation process changed from the bulk diffusion to the surface oxygen exchange when the CGOeP BC0.5F1.5O membrane thickness decreased to 0.8 mm or less. Due to the high oxygen permeation fluxes and the excellent structural stability under CO2 atmosphere, the CGOeP BC0.5F1.5O membrane is a great potential candidate material for separating oxygen from air in the oxy-fuel combustion techniques.
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| 关 键 词： | 氧稳定性 复合膜 双相 X射线衍射 扫描电子显微镜 乙二胺四乙酸 化学相容性 铁离子掺杂 |
| 收稿时间： | 25 March 2014 |
Oxygen Permeation and Stability of Ce0.8Gd0.2O2-δ-PrBaCo2-xFexO5＋δ Dual-phase Composite Membranes |
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| Bo Jiang Hongwei Cheng Longfei Luo Xionggang Lu Zhongfu Zhou.Oxygen Permeation and Stability of Ce0.8Gd0.2O2-δ-PrBaCo2-xFexO5＋δ Dual-phase Composite Membranes[J].Journal of Materials Science & Technology,2014,30(12):1174-1180. |
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| Authors: | Bo Jiang Hongwei Cheng Longfei Luo Xionggang Lu Zhongfu Zhou |
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| Abstract: | Dual-phase membrane Phase stability Oxygen permeation CO2-tolerance |
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| Keywords: | Dual-phase membrane Phase stability Oxygen permeation CO_-tolerance |
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