【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%。更多还原

【Abstract】 The electrically conductive phase Pr Ba Co2O5+δ was coated on the surface of the ion conductive phase Ce0.8Sm0.2O2-δ by a liquid coating strategy. After sintering, a novel Ce0.8Sm0.2O2-δ–Pr Ba Co2O5+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 flux, 2.22×10-7 and 2.46×10-7 mol·cm-2min-1 at 945 ℃, respectively, which are 6% and 17% higher than the SDC–PBCO(60/40) prepared by the conventional ceramic route.更多还原