Oxygen permeability of nanocrystalline Ce0.8Gd0.2O1.9-CoFe2O4 mixed-conductive films
Oxygen permeability of nanocrystalline Ce0.8Gd0.2O1.9-CoFe2O4 mixed-conductive films
复制标题
纳米晶Ce0.8Gd0.2O1.9-CoFe2O4混合导电薄膜的透氧率
DOI：
10.1016/j.memsci.2006.09.032
复制
发表时间：
2006
影响因子：
9.5
通讯作者：
H. Takamura
中科院分区：
文献类型：
--
作者：
I. Kagomiya;T. Iijima;H. Takamura
电子和氧离子导电(混合导电)氧化物允许氧气在通常800-1000°C的高温下在氧气分压差下渗透。由于O2−离子和电子的固态传输所需的高激活能，氧气渗透性能在较低温度下突然下降。这项研究旨在改善混合导电固体氧化物在较低温度下的氧气渗透通量。采用化学溶液旋涂技术在多孔Ce0.8Gd0.2O1.9衬底上制备了致密纳米晶Ce0.8Gd0.2O1.9(CGO)-CoFe2O4(CFO)混合导电薄膜。研究了CGO-CFO薄膜的透氧量、表面形貌以及CGO-CFO粉末样品的结晶度。通过降低制备温度，提高了CGO-CFO膜的氧渗透通量，表明膜的氧渗透性能与材料的纳米晶结构密切相关。这一结果对于开发在大约600°C的较低温度下具有增强性能的透氧器件具有重要意义。
Electronic and oxygen ionic conductive (mixed-conductive) oxides allow oxygen permeation under oxygen partial pressure differences at elevated temperatures of typically 800–1000°C. The oxygen permeation performance decreases abruptly at lower temperatures as a result of the high activation energy required for solid-state transport of O2−ions and electrons. This study is intended to improve the oxygen permeation flux of a mixed-conductive solid oxide at lower temperatures. Dense nanocrystalline Ce0.8Gd0.2O1.9(CGO)–CoFe2O4(CFO) mixed-conductive films were prepared on porous Ce0.8Gd0.2O1.9substrates using a chemical solution spin-coating technique. The oxygen permeation flux and morphology of the CGO–CFO films were investigated along with the crystallinity of the CGO–CFO powder samples. The oxygen permeation flux of the CGO–CFO films was improved through the use of a reduced preparation firing temperature, suggesting that the membrane's oxygen permeation properties are correlated closely with the material's nanocrystalline structure. This result is important for developing oxygen permeable devices with enhanced performance at lower temperatures of approximately 600°C.