Journal Article

FZJ-2020-03026

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Phase and microstructural characterizations for Ce0.8Gd0.2O2--FeCo2O4 dual phase oxygen transport membranes

Zeng, F. (Corresponding author)FZJ* ; Malzbender, J.FZJ* ; Baumann, S.FZJ* ; Krüger, M.FZJ* ; Winnubst, L. ; Guillon, O.FZJ* ; Meulenberg, W. A.FZJ*

2020
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/25601  doi:10.1016/j.jeurceramsoc.2020.06.035

Abstract: Dual phase oxygen transport membranes were prepared via solid state reaction at 1200 ℃. The sintered membranes were characterized via X-ray diffraction, back scattered electron microscopy and electron backscatter diffraction, and associated with image analysis and calculations to quantify phase compositions and microstructural features including volume fractions, grain sizes, and contiguity. The characterizations reveal a multi-phase system containing Ce1-xGdxO2-δ’ (x ≈ 0.1) (CGO10), and FeyCo3-yO4 (0.2 < y < 1.2) (FCO), CoO and Gd0.85Ce0.15Fe0.75Co0.25O3 (GCFCO) in the sintered membranes. In addition, a novel model is utilized to assess the evolution of the ambipolar conductivity with respect to microstructural features. Both experimental and calculated results indicate that if the grain sizes of all phases in the composites are similar, the optimal ambipolar conductivity is reached with a volume ratio of ionic conducting phase to electronic conducting phase close to 4:1. Meanwhile, the GCFCO phase dominates the effective electronic conductivity.

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Contributing Institute(s):

1. Werkstoffsynthese und Herstellungsverfahren (IEK-1)
2. Werkstoffstruktur und -eigenschaften (IEK-2)
3. JARA-ENERGY (JARA-ENERGY)

Research Program(s):

1. 113 - Methods and Concepts for Material Development (POF3-113) (POF3-113)

Appears in the scientific report 2020

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

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