title: A Dual-Phase Ceramic Membrane with Extremely High H2 Permeation Flux Prepared by Autoseparation of a Ceramic Precursor.
abstract: 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.
authors.affiliation: School of Chemistry and Chemical Engineering, South China University of Technology, 510640, Guangzhou, China.
authors.forename: Shunfan
authors.initials: S
authors.lastname: Cheng
authors.affiliation: School of Chemistry and Chemical Engineering, South China University of Technology, 510640, Guangzhou, China.
authors.forename: Yanjie
authors.initials: Y
authors.lastname: Wang
authors.affiliation: School of Chemistry and Chemical Engineering, South China University of Technology, 510640, Guangzhou, China.
authors.forename: Libin
authors.initials: L
authors.lastname: Zhuang
authors.affiliation: Institute of Physical Chemistry and Electrochemistry, Leibniz University of Hannover, Callinstrasse 3A, 30167, Hannover, Germany.
authors.forename: Jian
authors.initials: J
authors.lastname: Xue
authors.affiliation: School of Chemistry and Chemical Engineering, South China University of Technology, 510640, Guangzhou, China. ceyywei@scut.edu.cn.|Institute of Physical Chemistry and Electrochemistry, Leibniz University of Hannover, Callinstrasse 3A, 30167, Hannover, Germany. ceyywei@scut.edu.cn.
authors.forename: Yanying
authors.initials: Y
authors.lastname: Wei
authors.affiliation: Institute of Physical Chemistry and Electrochemistry, Leibniz University of Hannover, Callinstrasse 3A, 30167, Hannover, Germany.
authors.forename: Armin
authors.initials: A
authors.lastname: Feldhoff
authors.affiliation: Institute of Physical Chemistry and Electrochemistry, Leibniz University of Hannover, Callinstrasse 3A, 30167, Hannover, Germany. juergen.caro@pci.uni-hannover.de.
authors.forename: Jürgen
authors.initials: J
authors.lastname: Caro
authors.affiliation: School of Chemistry and Chemical Engineering, South China University of Technology, 510640, Guangzhou, China. hhwang@scut.edu.cn.|School of Chemical Engineering, The University of Adelaide, Adelaide, SA, 5005, Australia. hhwang@scut.edu.cn.
authors.forename: Haihui
authors.initials: H
authors.lastname: Wang
keywords: ceramic membranes; dual-phase composites; electron conductors; hydrogen permeation; proton conductors