This title appears in the Scientific Report :
2023
Please use the identifier:
http://dx.doi.org/10.3390/membranes13050482 in citations.
Please use the identifier: http://hdl.handle.net/2128/34368 in citations.
Role of Fe/Co Ratio in Dual Phase Ce0.8Gd0.2O2−δ–Fe3−xCoxO4 Composites for Oxygen Separation
Role of Fe/Co Ratio in Dual Phase Ce0.8Gd0.2O2−δ–Fe3−xCoxO4 Composites for Oxygen Separation
Dual-phase membranes are increasingly attracting attention as a solution for developing stable oxygen permeation membranes. Ce0.8Gd0.2O2−δ–Fe3−xCoxO4 (CGO-F(3−x)CxO) composites are one group of promising candidates. This study aims to understand the effect of the Fe/Co-ratio, i.e., x = 0, 1, 2, and...
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Personal Name(s): | Fischer, Liudmila (Corresponding author) |
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Ran, Ke / Schmidt, Christina / Neuhaus, Kerstin / Baumann, Stefan (Corresponding author) / Behr, Patrick / Mayer, Joachim / Bouwmeester, Henny J. M. / Nijmeijer, Arian / Guillon, Olivier / Meulenberg, Wilhelm A. | |
Contributing Institute: |
Helmholtz-Institut Münster Ionenleiter für Energiespeicher; IEK-12 Materialwissenschaft u. Werkstofftechnik; ER-C-2 Werkstoffsynthese und Herstellungsverfahren; IEK-1 |
Published in: | Membranes, 13 (2023) 5, S. 482 - |
Imprint: |
Basel
MDPI
2023
|
DOI: |
10.3390/membranes13050482 |
Document Type: |
Journal Article |
Research Program: |
Die Rolle von Grenzflächen in mehrphasigen Ceroxid-basierten Membranen für den Einsatz in Membranreaktoren Understanding the Structural and Functional Behavior of Solid State Systems Fundamentals and Materials Power-based Fuels and Chemicals |
Link: |
OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/34368 in citations.
Dual-phase membranes are increasingly attracting attention as a solution for developing stable oxygen permeation membranes. Ce0.8Gd0.2O2−δ–Fe3−xCoxO4 (CGO-F(3−x)CxO) composites are one group of promising candidates. This study aims to understand the effect of the Fe/Co-ratio, i.e., x = 0, 1, 2, and 3 in Fe3−xCoxO4, on microstructure evolution and performance of the composite. The samples were prepared using the solid-state reactive sintering method (SSRS) to induce phase interactions, which determines the final composite microstructure. The Fe/Co ratio in the spinel structure was found to be a crucial factor in determining phase evolution, microstructure, and permeation of the material. Microstructure analysis showed that all iron-free composites had a dual-phase structure after sintering. In contrast, iron-containing composites formed additional phases with a spinel or garnet structure which likely contributed to electronic conductivity. The presence of both cations resulted in better performance than that of pure iron or cobalt oxides. This demonstrated that both types of cations were necessary to form a composite structure, which then allowed sufficient percolation of robust electronic and ionic conducting pathways. The maximum oxygen flux is jO2 = 0.16 and 0.11 mL/cm2·s at 1000 °C and 850 °C, respectively, of the 85CGO-FC2O composite, which is comparable oxygen permeation flux reported previously. |