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Angew Chem Int Ed Engl. 2015 Apr 13;54(16):4847-50. doi: 10.1002/anie.201411963. Epub 2015 Feb 23.

A mixed ionic and electronic conducting dual-phase membrane with high oxygen permeability.

Author information

1
Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstrasse 22, 30167 Hannover (Germany). wei.fang@pci.uni-hannover.de.

Abstract

To combine good chemical stability and high oxygen permeability, a mixed ionic-electronic conducting (MIEC) 75 wt% Ce(0.85)Gd(0.1)Cu(0.05)O(2-δ)-25 wt% La(0.6)Ca(0.4)FeO(3-δ)(CGCO-LCF) dual-phase membrane based on a MIEC-MIEC composite has been developed. Copper doping into Ce(0.9)Gd(0.1)O(2-δ) (CGO) oxide enhances both ionic and electronic conductivity, which then leads to a change from ionic conduction to mixed conduction at elevated temperatures. For the first time we demonstrate that an intergranular film with 2-10 nm thickness containing Ce, Ca, Gd, La, and Fe has been formed between the CGCO grains in the CGCO-LCF one-pot dual-phase membrane. A high oxygen permeation flux of 0.70 mL min(-1) cm(-2) is obtained by the CGCO-LCF one-pot dual-phase membrane with 0.5 mm thickness at 950 °C using pure CO2 as the sweep gas, and the membrane shows excellent stability in the presence of CO2 even at lower temperatures (800 °C) during long-term operation.

KEYWORDS:

carbon dioxide; electronic conductors; ionic conductors; membranes; oxygen transport

PMID:
25706102
DOI:
10.1002/anie.201411963

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