Journal Article

FZJ-2023-01968

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Role of Fe/Co Ratio in Dual Phase Ce0.8Gd0.2O2−δ–Fe3−xCoxO4 Composites for Oxygen Separation

Fischer, L. (Corresponding author)FZJ* ; Ran, K.FZJ* ; Schmidt, C.FZJ* ; Neuhaus, K.FZJ* ; Baumann, S. (Corresponding author)FZJ* ; Behr, P.FZJ* ; Mayer, J.FZJ* ; Bouwmeester, H. J. M. ; Nijmeijer, A. ; Guillon, O.FZJ* ; Meulenberg, W. A.FZJ*

2023
MDPI Basel

This record in other databases:      

Please use a persistent id in citations: http://hdl.handle.net/2128/34368  doi:10.3390/membranes13050482

Abstract: 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.

---

Contributing Institute(s):

1. Werkstoffsynthese und Herstellungsverfahren (IEK-1)
2. Materialwissenschaft u. Werkstofftechnik (ER-C-2)
3. Helmholtz-Institut Münster Ionenleiter für Energiespeicher (IEK-12)

Research Program(s):

1. 1232 - Power-based Fuels and Chemicals (POF4-123) (POF4-123)
2. 1221 - Fundamentals and Materials (POF4-122) (POF4-122)
3. 5353 - Understanding the Structural and Functional Behavior of Solid State Systems (POF4-535) (POF4-535)
4. DFG project 387282673 - Die Rolle von Grenzflächen in mehrphasigen Ceroxid-basierten Membranen für den Einsatz in Membranreaktoren (387282673) (387282673)

Appears in the scientific report 2023

---

Database coverage:
; ; ; ; Article Processing Charges ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; DOAJ Seal ; Ebsco Academic Search ; Essential Science Indicators ; Fees ; IF < 5 ; JCR ; PubMed Central ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

---