Synthesis, characterization and evaluation of cation-ordered LnBaCo2O5+δ as materials of oxygen permeation membranes and cathodes of SOFCs
Article
Article Title | Synthesis, characterization and evaluation of cation-ordered LnBaCo2O5+δ as materials of oxygen permeation membranes and cathodes of SOFCs |
---|---|
ERA Journal ID | 4742 |
Article Category | Article |
Authors | Zhang, Kun (Author), Ge, Lei (Author), Ran, Ran (Author), Shao, Zongping (Author) and Liu, Shaomin (Author) |
Journal Title | Acta Materialia |
Journal Citation | 56 (17), pp. 4876-4889 |
Number of Pages | 14 |
Year | 2008 |
Publisher | Elsevier |
Place of Publication | Netherlands |
ISSN | 1359-6454 |
1873-2453 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.actamat.2008.06.004 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S1359645408004126?via%3Dihub |
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. |
Keywords | LnBa2Co2O5+d, mixed conductor, cation-ordered, SOFC, ceramic membrane |
ANZSRC Field of Research 2020 | 340210. Solid state chemistry |
400409. Separation technologies | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Nanjing University of Technology, China |
University of Queensland | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q540q/synthesis-characterization-and-evaluation-of-cation-ordered-lnbaco2o5-as-materials-of-oxygen-permeation-membranes-and-cathodes-of-sofcs
173
total views8
total downloads2
views this month0
downloads this month