Synthesis, characterization and evaluation of cation-ordered LnBaCo(2)O(5+delta) as materials of oxygen permeation membranes and cathodes of SOFCs

Zhang, Kun, Ge, Lei, Ran, Ran, Shao, Zongping and Liu, Shaomin (2008) Synthesis, characterization and evaluation of cation-ordered LnBaCo(2)O(5+delta) as materials of oxygen permeation membranes and cathodes of SOFCs. Acta Materialia, 56 17: 4876-4889. doi:10.1016/j.actamat.2008.06.004


Author Zhang, Kun
Ge, Lei
Ran, Ran
Shao, Zongping
Liu, Shaomin
Title Synthesis, characterization and evaluation of cation-ordered LnBaCo(2)O(5+delta) as materials of oxygen permeation membranes and cathodes of SOFCs
Formatted title
Synthesis, characterization and evaluation of cation-ordered LnBaCo2O5+δ as materials of oxygen permeation membranes and cathodes of SOFCs
Journal name Acta Materialia   Check publisher's open access policy
ISSN 1359-6454
1873-2453
Publication date 2008-10
Sub-type Article (original research)
DOI 10.1016/j.actamat.2008.06.004
Volume 56
Issue 17
Start page 4876
End page 4889
Total pages 14
Place of publication Oxford, United Kingdom
Publisher Pergamon
Language eng
Formatted abstract
LnBaCo2O5+δ (Ln = La, Pr, Nd, Sm, Gd, and Y) was synthesized via an EDTA–citrate complexing process. The particular Ln3+ dopant had a significant effect on the oxide’s phase structure/stability, oxygen content, electrical conductivity, oxygen permeability, and cathode performance. Stable, cation-ordered oxides with layered lattice structures were obtained with medium-sized Ln3+ ions over a wide range of oxygen partial pressures, a property essential for applications as oxygen separation membranes and solid oxide fuel cell (SOFC) cathodes. PrBaCo2O5+δ demonstrated the highest oxygen flux (∼5.09 × 10−7 mol cm−2 s−1 at 900 °C), but this value was still significantly lower than that of Ba0.5Sr0.5Co0.8Fe0.2O3−δ perovskite (∼3.1 × 10−6 mol cm−2 s−1 at 900 °C). The observed difference was attributed to the much longer diffusion distance through a polycrystalline membrane with a layered lattice structure than through cubic perovskite because bulk diffusion was the rate-limiting step of permeation. An area-specific resistance of ∼0.213 Ω cm2 was achieved at 600 °C with a PrBaCo2O5+δ cathode, suggesting that the layer-structured oxides were promising alternatives to ceramic membranes for SOFC cathodes.
Keyword LnBaCo(2)O(5+delta)
Mixed conductor
Cation-ordered
SOFA framework
Ceramic membrane
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemical Engineering Publications
 
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Created: Thu, 03 Sep 2009, 09:20:54 EST by Mr Andrew Martlew on behalf of Functional Nanomaterials