A Dual-Phase Ceramic Membrane with Extremely High H2 Permeation Flux Prepared by Autoseparation of a Ceramic Precursor

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• 作者：Shunfan Cheng ; Yanjie Wang ; Libin Zhuang ; Dr. Jian Xue ; Dr. Yanying Wei ; Prof. Armin Feldhoff ; Prof. Jü ; rgen Caro and Prof. Haihui Wang
• 刊名：Angewandte Chemie International Edition
• 出版年：2016
• 出版时间：August 26, 2016
• 年：2016
• 卷：55
• 期：36
• 页码：10895-10898
• 全文大小：1478K
• ISSN：1521-3773

文摘

A novel concept for the preparation of multiphase composite ceramics based on demixing of a single ceramic precursor has been developed and used for the synthesis of a dual-phase H₂-permeable ceramic membrane. The precursor BaCe_0.5Fe_0.5O_3−δ decomposes on calcination at 1370 °C for 10 h into two thermodynamically stable oxides with perovskite structures: the cerium-rich oxide BaCe_0.85Fe_0.15O_3−δ (BCF8515) and the iron-rich oxide BaCe_0.15Fe_0.85O_3−δ (BCF1585), 50 mol % each. In the resulting dual-phase material, the orthorhombic perovskite BCF8515 acts as the main proton conductor and the cubic perovskite BCF1585 as the main electron conductor. The dual-phase membrane shows an extremely high H₂ permeation flux of 0.76 mL min⁻¹ cm⁻² at 950 °C with 1.0 mm thickness. This auto-demixing concept should be applicable to the synthesis of other ionic-electronic conducting ceramics.