title: A mixed ionic and electronic conducting dual-phase membrane with high oxygen permeability.
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.
authors.affiliation: Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstrasse 22, 30167 Hannover (Germany). wei.fang@pci.uni-hannover.de.
authors.forename: Wei
authors.initials: W
authors.lastname: Fang
authors.forename: Fangyi
authors.initials: F
authors.lastname: Liang
authors.forename: Zhengwen
authors.initials: Z
authors.lastname: Cao
authors.forename: Frank
authors.initials: F
authors.lastname: Steinbach
authors.forename: Armin
authors.initials: A
authors.lastname: Feldhoff
keywords: carbon dioxide; electronic conductors; ionic conductors; membranes; oxygen transport