Dense/Porous Asymmetric-Structured Oxygen Permeable Membranes Based on La0.6Ca0.4CoO3 Perovskite-Type Oxide

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• 作者：Ken Watanabe ; Masayoshi Yuasa ; Tetsuya Kida ; Kengo Shimanoe ; Yasutake Teraoka ; Noboru Yamazoe
• 刊名：Chemistry of Materials
• 出版年：2008
• 出版时间：November 25, 2008
• 年：2008
• 卷：20
• 期：22
• 页码：6965-6973
• 全文大小：521K
• 年卷期：v.20,no.22(November 25, 2008)
• ISSN：1520-5002

文摘

To achieve high-efficiency oxygen permeation using mixed (ionic and electronic) conducting perovskite-type oxides, we examined asymmetric-structured membranes of La_0.6Ca_0.4CoO₃ in which a thin dense membrane was deposited on a porous support. The La_0.6Ca_0.4CoO₃ porous support was fabricated using irregular-shaped precursor particles prepared through an oxalate method. The fabricated support had good gas permeability and thermal stability, showing sufficient properties as a support for dense thin membranes. A dense membrane of 10 μm thickness was successfully formed on the porous support by coating a La_0.6Ca_0.4CoO₃ slurry and subsequent densification by sintering. The deposited thin membrane was gastight and free from clacks, as revealed by gas permeation tests and SEM observations. The asymmetric membrane exhibited a high oxygen permeability of 1.66 cm³ (STP, standard temperature and pressure) min⁻¹ cm⁻² at 930 °C, which was four times higher than that of a typical sintered-disk type membrane with 1200 μm thickness, demonstrating its feasibility as a high-performance oxygen separation membrane.