共沉淀法制备Cu掺杂的钙钛矿型混合导体透氧材料

采用并流共沉淀法合成了掺杂Cu的钙钛矿型混合导体透氧膜材料.考察了pH值、陈化时间等制备条件对前驱体性质和膜片透氧性能的影响,采用TG-DSC考察了复合氧化物粉体的生成过程,采用XRD、TEM对粉体的结构和形态进行了表征,对材料进行了透氧性能测试并与固相反应法作了比较.结果表明,pH=10～11,陈化时间为10小时是最佳的前驱体制备条件,合成温度为800℃即可得到纯相钙钛矿结构的粉体,其平均颗粒直径为90nm,透氧测试结果显示,制备方法和Cu掺杂量对膜片的透氧性能有显著影响,900℃时共沉淀法制备的SrFe0.6Ti0.1Cu0.3O3-δ的透氧量达到O.64ml·min～·cm-2(STP).

Preparation of Cu Doped Perovskite-type Mixed Conducting Membrane Materials by Coprecipitation Method

Cu doped perovskite-type oxygen permeable ceramics were synthesized by coprecipitation method. The effects of pH value and aging time on the properties of the precursors and the oxygen permeation fluxes of the membranes were studied. The formation of the solid solution was studied by TG-DSC, the structure and the particle size distribution were determined by XRD and TEM. It was found that the preparation conditions with pH = 10 ～ 11 and 10 hours aging were optimal for coprecipitation method. The powder with pure perovskite structure was synthesized at 800℃ and the particle size was about 90 nm. The oxygen permeation test showed that the preparation conditions and Cu doping content had great effects on the oxygen permeability of the materials. At 900℃, the oxygen permeation flux of the SrFe0.6Ti0.1 Cu0.3 O3-δ membrane was 0.64 ml· min - 1 · cm - 2 (STP).