一种通过陶瓷前驱体自动分离制备的具有极高 H2 渗透通量的双相陶瓷膜。
A Dual-Phase Ceramic Membrane with Extremely High H2 Permeation Flux Prepared by Autoseparation of a Ceramic Precursor.
机构信息
School of Chemistry and Chemical Engineering, South China University of Technology, 510640, Guangzhou, China.
Institute of Physical Chemistry and Electrochemistry, Leibniz University of Hannover, Callinstrasse 3A, 30167, Hannover, Germany.
出版信息
Angew Chem Int Ed Engl. 2016 Aug 26;55(36):10895-8. doi: 10.1002/anie.201604035. Epub 2016 Jul 27.
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 BaCe0.5 Fe0.5 O3-δ decomposes on calcination at 1370 °C for 10 h into two thermodynamically stable oxides with perovskite structures: the cerium-rich oxide BaCe0.85 Fe0.15 O3-δ (BCF8515) and the iron-rich oxide BaCe0.15 Fe0.85 O3-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.
已经开发出一种基于单一陶瓷前体分相制备多相复合陶瓷的新概念，并将其用于合成双相 H2 渗透陶瓷膜。前体 BaCe0.5 Fe0.5 O3-δ 在 1370°C 下煅烧 10 小时分解为两种具有钙钛矿结构的热力学稳定氧化物：富铈氧化物 BaCe0.85 Fe0.15 O3-δ（BCF8515）和富铁氧化物 BaCe0.15 Fe0.85 O3-δ（BCF1585），摩尔分数各为 50%。在所得的双相材料中，正交钙钛矿 BCF8515 作为主要的质子导体，立方钙钛矿 BCF1585 作为主要的电子导体。双相膜在 950°C 时厚度为 1.0mm 时具有 0.76mL min-1 cm-2 的极高 H2 渗透通量。这种自动分相概念应该适用于其他离子-电子传导陶瓷的合成。
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