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Chemically and mechanically stable dual-phase membrane with high oxygen permeation flux

Abstract

This contribution details our comprehensive efforts to design a chemically and mechanically stable dual-phase membrane with a high oxygen permeation flux. To enhance the mechanical and thermo-mechanical strength of the dual-phase membrane, GDC (Gd-doped ceria, Ce0.9Gd0.1O2-δ) was added at 70 vol.% to LSCF (La0.6Sr0.4Co0.2Fe0.8O3-δ) in a dual-phase membrane within the electronic threshold for electronic conductivity. The highly active coating material (SrCo0.1Fe0.8Nb0.1O3-δ, SCFN) was adopted in consideration of the relationship between the bulk diffusion (D) and surface exchange kinetics (k) of the dual-phase membrane, resulting in not only a high oxygen flux but also chemical stability in CO2. The highest oxygen permeation flux obtained was 10.41 mL·cm-2·min-1 at 1000 °C in the SCFN-coated dual-phase membrane; this is above the techno-economic target (5-10 mL·cm-2·min-1) for the commercialization of oxygen transport membranes (OTMs) and comparable to that of BSCF (Ba0.5Sr0.5Co0.8Fe0.2O3-δ) with a similar membrane thickness. The SCFN-coated dual-phase membrane also shows high CO2-stability over 200 h and thermo-mechanical stability under rapid thermal cycling (20 °C·min-1), which cannot be accomplished in single-phase membrane.

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Supplementary files

Article information


Submitted
05 Aug 2020
Accepted
14 Oct 2020
First published
15 Oct 2020

J. Mater. Chem. A, 2020, Accepted Manuscript
Article type
Paper

Chemically and mechanically stable dual-phase membrane with high oxygen permeation flux

G. D. Nam, G. Lee, S. Choi, J. Lee, S. Song and J. H. Joo, J. Mater. Chem. A, 2020, Accepted Manuscript , DOI: 10.1039/D0TA07680E

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