Projects per year
Abstract
BaCo1−xNbxO3−δ (BCNx, x = 0.1–0.2) membranes were synthesized through conventional solid-phase reactions. The introduction of niobium facilitates the formation of the cubic perovskite structure and decreases oxygen nonstoichiometry. BCNx membranes possess higher oxygen permeation flux compared with BaCo0.7Fe0.2Nb0.1O3−δ membrane at the same condition. A stable permeation flux as high as 2.61 ml cm−2 min−1 is obtained through BaCo0.9Nb0.1O3−δ membrane at 900 °C under the Air/He gradient. Long-time permeation study shows that the oxygen fluxes of BCNx membranes are stable at 900 °C but degrade slowly with time at 850 °C. XRD and TG–DSC results indicate that the degradation behavior occured at 850 °C is due to the phase transition from the cubic perovskite to monoclinic or orthorhombic structure, which is governed by the oxygen partial pressure and temperature. The oxidation of cobalt ion is considered to be the nature for the phase transition, which makes the tolerance factor increasing and results in structural destabilization.
Original language | English |
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Pages (from-to) | 38-43 |
Number of pages | 6 |
Journal | Journal of Alloys and Compounds |
Volume | 638 |
DOIs | |
Publication status | Published - 2015 |
Keywords
- Perovskite
- Niobium
- Oxygen permeation
- Structural stability
- Phase transition
Projects
- 2 Finished
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Computer-Aided Design of High-Performance Photocatalysts for Solar Hydrogen Producion Based on Red Titanium Dioxide
Sun, C. (Primary Chief Investigator (PCI))
Australian Research Council (ARC)
1/01/14 → 31/12/17
Project: Research
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To identify and understand highly reactive surfaces for solar hydrogen production
Sun, C. (Primary Chief Investigator (PCI)), Liu, G. (Partner Investigator (PI)) & Yang, H. G. (Partner Investigator (PI))
Australian Research Council (ARC)
1/01/13 → 31/12/17
Project: Research