Erschienen in:
Angewandte Chemie International Edition, 55 (2016) 36, Seite 10895-10898
Sprache:
Englisch
DOI:
10.1002/anie.201604035
ISSN:
1433-7851;
1521-3773
Entstehung:
Anmerkungen:
Beschreibung:
AbstractA 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 BaCe0.5Fe0.5O3−δ decomposes on calcination at 1370 °C for 10 h into two thermodynamically stable oxides with perovskite structures: the cerium‐rich oxide BaCe0.85Fe0.15O3−δ (BCF8515) and the iron‐rich oxide BaCe0.15Fe0.85O3−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.