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Title: Influence of Microstructure and Surface Activation of Dual-Phase Membrane Ce 0.8 Gd 0.2 O 2-δ -FeCo 2 O 4 on Oxygen Permeation

Journal Article · · Journal of the American Ceramic Society
DOI:https://doi.org/10.1111/jace.13938· OSTI ID:1261498
 [1];  [1];  [1];  [1];  [1];  [2];  [1];  [1];  [3];  [1];  [1];
  1. Julich Research Centre (Germany); Julich Aachen Research Alliance (Germany)
  2. Julich Research Centre (Germany)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

In dual-phase oxygen transport membranes we noticed that there is fast-growing interest in research for oxyfuel combustion process application. One such potential candidate is CGO-FCO (60wt% Ce0.8Gd0.2O2-δ-40wt% FeCo2O4) identified to provide good oxygen permeation flux with substantial stability in harsh atmosphere. Dense CGO-FCO membranes of 1mm thickness were fabricated by sintering dry pellets pressed from powders synthesized by one-pot method (modified Pechini process) at 1200 degrees C for 10h. Microstructure analysis indicates presence of a third orthorhombic perovskite phase in the sintered composite. We also identified that the spinel phase tends to form an oxygen deficient phase at the grain boundary of spinel and CGO phases. Surface exchange limitation of the membranes was overcome by La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) porous layer coating over the composite. Moreover, the oxygen permeation flux of the CGO-FCO screen printed with a porous layer of 10mthick LSCF is 0.11mL/cm2 per minute at 850 degrees C with argon as sweep and air as feed gas at the rates of 50 and 250mL/min.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725; 608524
OSTI ID:
1261498
Journal Information:
Journal of the American Ceramic Society, Vol. 99, Issue 1; ISSN 0002-7820
Publisher:
American Ceramic SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 37 works
Citation information provided by
Web of Science

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Cited By (3)

Designing CO 2 -resistant oxygen-selective mixed ionic–electronic conducting membranes: guidelines, recent advances, and forward directions journal January 2017
An Interdisciplinary View of Interfaces: Perspectives Regarding Emergent Phase Formation journal October 2017
Assessment of the Effect of Transition Metal Oxide Addition on the Conductivity of Commercial Gd-Doped Ceria journal January 2018

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