摘要
采用液相包覆法将电子导电相PrBaCo2O5+δ包覆在离子导电相Ce0.8Sm0.2O2-δ表面,烧结后得到Ce0.8Sm0.2O2-δ-PrBaCo2O5+δ(SDC-PBCO)双相透氧膜。通过XRD、SEM、四端引线法和透氧测试等手段分别考察了膜的相组成、显微形貌、电子电导率和氧渗透能力。实验结果表明,包覆法制备的膜材料双相分布均匀,电子相形成连续导通的阈值较直接固相混合法由40wt.%降低至30wt.%,因而提高了双相膜的透氧率。945℃时膜厚为1mm的SDC-PBCO(60/40)和SDC-PBCO(70/30)双相膜的透氧率分别为2.22×10-7mol·cm-2·min-1和2.46×10-7mol·cm-2·min-1,比固相混合法制备的SDC-PBCO(60/40)双相膜提高了6%和17%。
The electrically conductive phase PrBaCo_2O_5＋δ was coated on the surface of the ion conductive phase Ce_0.8Sm_0.2O_2-δ by a liquid coating strategy. After sintering, a novel Ce_0.8Sm_0.2O_2-δ–PrBaCo_2O_5＋δ（SDC–PBCO） dual-phase oxygen permeation membrane was achieved. The phase composition, the microstructure, the electrical conductivity and the oxygen permeability of the dual-phase membrane were studied by XRD, SEM, four-terminal DC method and vertical high-temperature gas permeation cell, respectively. The results indicate that the two phases have homogeneous distribution. On the premise of forming percolative network, compared with the conventional ceramic route, its electronic phase threshold volume percentage is decreased from 40 wt.% to 30 wt.%, resulting in the high permeability. The SDC–PBCO （60/40） and SDC–PBCO （70/30） membranes with 1 mm thickness exhibit very high oxygen permeation lfux, 2.22×10^-7 and 2.46×10^-7 mol-cm^-2 min^-1 at 945℃, respectively, which are 6% and 17% higher than the SDC–PBCO （60/40） prepared by the conventional ceramic route.
出处
《陶瓷学报》
CAS
北大核心
2014年第6期581-587,共7页
Journal of Ceramics
基金
广东省产学研项目(编号:2012B091100129)
国家自然科学基金青年基金(51402135)
江西省科技厅青年科学基金(编号:20142BAB216006)
江西省教育厅青年基金(编号:GJJ13621)
景德镇科技局项目(编号:701301-323)资助项目
关键词
陶瓷膜
氧分离
混合导体
包覆
双相
ceramic membrane oxygen separation mixed-conductor coating dual-phase
作者简介
通信联系人：赵海雷（1966-），女，博士，教授。
