TY  - JOUR
AU  - Fischer, Liudmila
AU  - Ran, Ke
AU  - Schmidt, Christina
AU  - Neuhaus, Kerstin
AU  - Baumann, Stefan
AU  - Behr, Patrick
AU  - Mayer, Joachim
AU  - Bouwmeester, Henny J. M.
AU  - Nijmeijer, Arian
AU  - Guillon, Olivier
AU  - Meulenberg, Wilhelm A.
TI  - Role of Fe/Co Ratio in Dual Phase Ce0.8Gd0.2O2−δ–Fe3−xCoxO4 Composites for Oxygen Separation
JO  - Membranes
VL  - 13
IS  - 5
SN  - 2077-0375
CY  - Basel
PB  - MDPI
M1  - FZJ-2023-01968
SP  - 482 -
PY  - 2023
AB  - 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.
LB  - PUB:(DE-HGF)16
C6  - 37233543
UR  - <Go to ISI:>//WOS:000997997600001
DO  - DOI:10.3390/membranes13050482
UR  - https://juser.fz-juelich.de/record/1007151
ER  -