Phase composition and proton uptake of acceptor-doped self-generated Ba(Ce,Fe)O3-δ – Ba(Fe,Ce)O3-δ composites
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in: Solid State Ionics, Jahrgang 406.2024, Nr. March, 116474, 03.2024.
Publikationen: Beitrag in Fachzeitschrift › Artikel › Forschung › (peer-reviewed)
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TY - JOUR
T1 - Phase composition and proton uptake of acceptor-doped self-generated Ba(Ce,Fe)O3-δ – Ba(Fe,Ce)O3-δ composites
AU - Nader, Christina
AU - Lammer, Judith
AU - Egger, Andreas
AU - Berger, Christian
AU - Sitte, Werner
AU - Grogger, Werner
AU - Merkle, Rotraut
AU - Maier, Joachim
AU - Bucher, Edith
N1 - Publisher Copyright: © 2024 The Authors
PY - 2024/3
Y1 - 2024/3
N2 - Self-generated Ba(Ce,Fe,In)O 3-δ composites were prepared by one-pot sol-gel synthesis. They consist of Ce-rich and Fe-rich phases, and are intended to supply the required protonic and electronic transport for air electrode materials in protonic ceramic fuel and electrolysis cells (PCFC, PCEC). Crystal structure, lattice parameters, and the relative phase amounts of the composites were obtained from X-ray diffraction. The local chemical composition and distribution of cations within the individual phases were characterized by scanning transmission electron microscopy and energy-dispersive X-ray spectroscopy. Annealing experiments indicate that the miscibility gap of the BaCe 0.8-xFe xIn 0.2O 3-δ system ranges from [Ce]/([Ce] + [Fe]) ratios of ~ 0.2 to ~ 0.9. The In 3+ acceptor shows a tendency to accumulate in the Fe-rich phase, with the ratio In(Ce-rich phase)/In(Fe-rich phase) being in the range of 0.3–0.7. The proton uptake capacity of the materials, which was analyzed by thermogravimetry, increases with an increasing amount of In and decreasing amount of Fe in the precursor. Proton concentrations are in the range of 1–4 mol% at 400 °C. Further measurements on BaCe 0.4Fe 0.4Acc 0.2O 3-δ (Acc = Y, Yb, Gd, Sm, Sc) composites show that proton uptake is generally increased compared to the undoped system BaCe 0.5Fe 0.5O 3-δ. However, variations in the acceptor ion can tune the proton uptake only to a limited extent.
AB - Self-generated Ba(Ce,Fe,In)O 3-δ composites were prepared by one-pot sol-gel synthesis. They consist of Ce-rich and Fe-rich phases, and are intended to supply the required protonic and electronic transport for air electrode materials in protonic ceramic fuel and electrolysis cells (PCFC, PCEC). Crystal structure, lattice parameters, and the relative phase amounts of the composites were obtained from X-ray diffraction. The local chemical composition and distribution of cations within the individual phases were characterized by scanning transmission electron microscopy and energy-dispersive X-ray spectroscopy. Annealing experiments indicate that the miscibility gap of the BaCe 0.8-xFe xIn 0.2O 3-δ system ranges from [Ce]/([Ce] + [Fe]) ratios of ~ 0.2 to ~ 0.9. The In 3+ acceptor shows a tendency to accumulate in the Fe-rich phase, with the ratio In(Ce-rich phase)/In(Fe-rich phase) being in the range of 0.3–0.7. The proton uptake capacity of the materials, which was analyzed by thermogravimetry, increases with an increasing amount of In and decreasing amount of Fe in the precursor. Proton concentrations are in the range of 1–4 mol% at 400 °C. Further measurements on BaCe 0.4Fe 0.4Acc 0.2O 3-δ (Acc = Y, Yb, Gd, Sm, Sc) composites show that proton uptake is generally increased compared to the undoped system BaCe 0.5Fe 0.5O 3-δ. However, variations in the acceptor ion can tune the proton uptake only to a limited extent.
KW - Barium indium cerate
KW - Barium indium ferrate
KW - Crystal structure
KW - Miscibility gap
KW - Proton uptake capacity
KW - Self-generated composite
UR - http://www.scopus.com/inward/record.url?scp=85183452088&partnerID=8YFLogxK
U2 - 10.1016/j.ssi.2024.116474
DO - 10.1016/j.ssi.2024.116474
M3 - Article
VL - 406.2024
JO - Solid State Ionics
JF - Solid State Ionics
SN - 0167-2738
IS - March
M1 - 116474
ER -