The in situ generated emerging phase inside dual phase oxygen transport membranes

Ke Ran; Fanlin Zeng; Liudmila Fischer; Stefan Baumann; Wilhelm A. Meulenberg; Kerstin Neuhaus; Joachim Mayer

doi:10.1016/j.actamat.2022.118034

The in situ generated emerging phase inside dual phase oxygen transport membranes

Ke Ran^*
, Fanlin Zeng
, Liudmila Fischer
, Stefan Baumann
, Wilhelm A. Meulenberg
, Kerstin Neuhaus
, Joachim Mayer

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

6 Citations (Scopus)

7 Downloads (Pure)

Abstract

The in situ generated emerging phase inside the dual-phase oxygen transport membranes (DP-OTMs) plays a crucial role in boosting the overall performance of DP-OTMs. However, its detailed structure and properties are still not fully understood. Utilizing advanced transmission electron microscopy (TEM) techniques, the emerging phase Gd_xCe_1-xFe_yCo_1-yO_3-δ (GCFCO) inside the Ce_xGd_1-xO_2-δ-FeCo₂O₄ (CGO-FC2O) OTMs was successfully characterized at the atomic scale. The newly formed GCFCO is primarily surrounded by the CGO, and contributes to a significant reduction of non-solute segregation at the CGO grain boundaries. Electronic characteristics of the GCFCO shows a sensitive dependence on its chemical composition, including the valence state of Ce and Fe as well as the oxygen vacancies. Additional CGO-GCFCO interfaces were introduced, where almost intact crystal structures were observed with slight Gd and Co segregation ∼1 nm at the edges. Approaching the interface, on the CGO side, only a minimum drop of the Ce valence was determined. On the GCFCO side, mixed Ce³⁺ and Ce⁴⁺ are partially occupying the Gd sites, while Fe and Co valence stay constant until the edge. Our study provides novel insight into the phase information within CGO-FC2O composites, which paves the path towards superior performance of various DP-OTMs.

Original language	English
Article number	118034
Journal	Acta materialia
Volume	234
Early online date	19 May 2022
DOIs	https://doi.org/10.1016/j.actamat.2022.118034
Publication status	Published - 1 Aug 2022

Keywords

EDXS
EELS
Emerging phase
Interface segregation
Oxygen transport membrane
STEM-HAADF
Valence states
n/a OA procedure

Access to Document

10.1016/j.actamat.2022.118034

Cite this

@article{ec674e5572244d028b36f5a141e22e4a,

title = "The in situ generated emerging phase inside dual phase oxygen transport membranes",

abstract = "The in situ generated emerging phase inside the dual-phase oxygen transport membranes (DP-OTMs) plays a crucial role in boosting the overall performance of DP-OTMs. However, its detailed structure and properties are still not fully understood. Utilizing advanced transmission electron microscopy (TEM) techniques, the emerging phase GdxCe1-xFeyCo1-yO3-δ (GCFCO) inside the CexGd1-xO2-δ-FeCo2O4 (CGO-FC2O) OTMs was successfully characterized at the atomic scale. The newly formed GCFCO is primarily surrounded by the CGO, and contributes to a significant reduction of non-solute segregation at the CGO grain boundaries. Electronic characteristics of the GCFCO shows a sensitive dependence on its chemical composition, including the valence state of Ce and Fe as well as the oxygen vacancies. Additional CGO-GCFCO interfaces were introduced, where almost intact crystal structures were observed with slight Gd and Co segregation ∼1 nm at the edges. Approaching the interface, on the CGO side, only a minimum drop of the Ce valence was determined. On the GCFCO side, mixed Ce3+ and Ce4+ are partially occupying the Gd sites, while Fe and Co valence stay constant until the edge. Our study provides novel insight into the phase information within CGO-FC2O composites, which paves the path towards superior performance of various DP-OTMs.",

keywords = "EDXS, EELS, Emerging phase, Interface segregation, Oxygen transport membrane, STEM-HAADF, Valence states, n/a OA procedure",

author = "Ke Ran and Fanlin Zeng and Liudmila Fischer and Stefan Baumann and Meulenberg, \{Wilhelm A.\} and Kerstin Neuhaus and Joachim Mayer",

note = "Funding Information: This work has been supported by the Deutsche Forschungsgemeinschaft (Project number 387282673 ). KR acknowledges support by the Bundesministerium f{\"u}r Bildung und Forschung (NEUROTEC). Publisher Copyright: {\textcopyright} 2022 Acta Materialia Inc.",

year = "2022",

month = aug,

day = "1",

doi = "10.1016/j.actamat.2022.118034",

language = "English",

volume = "234",

journal = "Acta materialia",

issn = "1359-6454",

publisher = "Elsevier",

}

TY - JOUR

T1 - The in situ generated emerging phase inside dual phase oxygen transport membranes

AU - Ran, Ke

AU - Zeng, Fanlin

AU - Fischer, Liudmila

AU - Baumann, Stefan

AU - Meulenberg, Wilhelm A.

AU - Neuhaus, Kerstin

AU - Mayer, Joachim

N1 - Funding Information: This work has been supported by the Deutsche Forschungsgemeinschaft (Project number 387282673 ). KR acknowledges support by the Bundesministerium für Bildung und Forschung (NEUROTEC). Publisher Copyright: © 2022 Acta Materialia Inc.

PY - 2022/8/1

Y1 - 2022/8/1

N2 - The in situ generated emerging phase inside the dual-phase oxygen transport membranes (DP-OTMs) plays a crucial role in boosting the overall performance of DP-OTMs. However, its detailed structure and properties are still not fully understood. Utilizing advanced transmission electron microscopy (TEM) techniques, the emerging phase GdxCe1-xFeyCo1-yO3-δ (GCFCO) inside the CexGd1-xO2-δ-FeCo2O4 (CGO-FC2O) OTMs was successfully characterized at the atomic scale. The newly formed GCFCO is primarily surrounded by the CGO, and contributes to a significant reduction of non-solute segregation at the CGO grain boundaries. Electronic characteristics of the GCFCO shows a sensitive dependence on its chemical composition, including the valence state of Ce and Fe as well as the oxygen vacancies. Additional CGO-GCFCO interfaces were introduced, where almost intact crystal structures were observed with slight Gd and Co segregation ∼1 nm at the edges. Approaching the interface, on the CGO side, only a minimum drop of the Ce valence was determined. On the GCFCO side, mixed Ce3+ and Ce4+ are partially occupying the Gd sites, while Fe and Co valence stay constant until the edge. Our study provides novel insight into the phase information within CGO-FC2O composites, which paves the path towards superior performance of various DP-OTMs.

AB - The in situ generated emerging phase inside the dual-phase oxygen transport membranes (DP-OTMs) plays a crucial role in boosting the overall performance of DP-OTMs. However, its detailed structure and properties are still not fully understood. Utilizing advanced transmission electron microscopy (TEM) techniques, the emerging phase GdxCe1-xFeyCo1-yO3-δ (GCFCO) inside the CexGd1-xO2-δ-FeCo2O4 (CGO-FC2O) OTMs was successfully characterized at the atomic scale. The newly formed GCFCO is primarily surrounded by the CGO, and contributes to a significant reduction of non-solute segregation at the CGO grain boundaries. Electronic characteristics of the GCFCO shows a sensitive dependence on its chemical composition, including the valence state of Ce and Fe as well as the oxygen vacancies. Additional CGO-GCFCO interfaces were introduced, where almost intact crystal structures were observed with slight Gd and Co segregation ∼1 nm at the edges. Approaching the interface, on the CGO side, only a minimum drop of the Ce valence was determined. On the GCFCO side, mixed Ce3+ and Ce4+ are partially occupying the Gd sites, while Fe and Co valence stay constant until the edge. Our study provides novel insight into the phase information within CGO-FC2O composites, which paves the path towards superior performance of various DP-OTMs.

KW - EDXS

KW - EELS

KW - Emerging phase

KW - Interface segregation

KW - Oxygen transport membrane

KW - STEM-HAADF

KW - Valence states

KW - n/a OA procedure

UR - https://www.scopus.com/pages/publications/85130539180

U2 - 10.1016/j.actamat.2022.118034

DO - 10.1016/j.actamat.2022.118034

M3 - Article

AN - SCOPUS:85130539180

SN - 1359-6454

VL - 234

JO - Acta materialia

JF - Acta materialia

M1 - 118034

ER -

The in situ generated emerging phase inside dual phase oxygen transport membranes

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this