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以多孔氧化铝(porous alumina,p-Al2O3)为模型多孔电极衬底材料,利用对流-扩散效应成功制备得到了具有梯度结构的8%(以摩尔计)钇稳定氧化锆(yttria-stabilized zirconia,YSZ)电解质薄膜。该方法新颖、经济简单、适合于制备大尺寸平板型固体氧化物燃料电池中多孔电极支撑的电解质薄膜。利用扫描电镜和X射线角散分析技术对所制备电解质薄膜/p-Al2O3样品进行了微结构测试和表征。结果表明:由该方法在多孔衬底上实现的YSZ 电解质薄膜由生长于衬底表面上的均匀致密层(≈10μm)和衬底表面下孔道中均匀填充层(≈50μm)与弥散填充层(≈250μm)构成,且各层厚度可通过改变对流-扩散沉积条件得到调节。
In this paper, porous alumina (p-Al2O3) was used as a model porous electrode substrate material, and a yttria-stabilized zirconia with 8% molarity was successfully prepared by convection-diffusion effect. YSZ) electrolyte membrane. The method is novel, economical and simple, and is suitable for preparing a porous electrode supported electrolyte membrane in a large-size flat-type solid oxide fuel cell. Microstructures and characterization of the prepared electrolyte films / p-Al2O3 samples were investigated by scanning electron microscopy and X-ray diffraction. The results show that the YSZ electrolyte membrane fabricated on the porous substrate by this method is composed of a uniform dense layer (≈10μm) grown on the surface of the substrate and a uniform packed layer (≈50μm) and a diffusion-filled layer ≈250 μm), and the thickness of each layer can be adjusted by changing the convection-diffusion deposition conditions.