(Invited) The Effect of Dopants on the Stabilization of the Cubic BSCF Phase in O
            <sub>2</sub>
            - and CO
            <sub>2</sub>
            -Containing Atmospheres

Gerthsen, D.; Meffert, Matthias; Störmer, Heike; Wilde, Virginia; Almar, Laura; Sigloch, Fabian; Unger, Lana-Simone; Wagner, Stefan; Ivers‐Tiffée, Ellen

doi:10.1149/07710.0035ecst

Cited by 3 publications

(2 citation statements)

References 8 publications

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“…To address this issue, scientists have artificially modified the composition of the BSCF material by substituting Co or Fe by foreign cations such as Ti 4+ , 13 Zr 4+ , 14,15 Y 3+ , 16,17 or Nb 5+ . 18 By using such a doping strategy, the phase stability of the BSCF perovskite at intermediate temperatures (500−850 °C) can be improved to some extent, albeit always at the expense of oxygen permeability.…”

Section: ■ Introductionmentioning

confidence: 99%

Temperature-Induced Structural Reorganization of W-Doped Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3−δ Composite Membranes for Air Separation

Lan

Sohn

et al. 2019

Chem. Mater.

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The practical use of Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) prototypical oxygen-transport membrane for air separation is currently hampered by the decomposition of the cubic perovskite into a variant with hexagonal stacking at intermediate temperatures of ≤850 °C, which impairs the oxygen transport. Here, we report the development of a W-doped BSCF composite that contains Fe-rich single perovskite (SP) and W-rich double perovskite (DP) phases with different crystallographic parameters. In contrast to BSCF, the BSCFW SP/DP composite maintains its cubic structure at 800 °C for 200 h, demonstrating its structural stability at intermediate temperatures. We use X-ray diffraction, scanning electron microscopy, and high-resolution transmission electron microscopy to show that the enhanced phase stability of the composite is associated with a temperature-induced SP–DP dynamic interaction, which involves W and Fe interdiffusion between the SP and DP phases, dynamically adjusting the chemical composition and limiting structural distortion and new phase formation. The composite exhibits a stable permeation performance in the oxygen-transport membrane during over 150 h operation at 800 and 700 °C, confirming the potential of intermediate-temperature oxygen-transport membranes for air separation and providing insight for designing thermally stable composite oxides.

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Section: ■ Introductionmentioning

confidence: 99%

Temperature-Induced Structural Reorganization of W-Doped Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3−δ Composite Membranes for Air Separation

Lan

Sohn

et al. 2019

Chem. Mater.

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“…Various doping strategies with transition metals like, e.g., Y, Ti or Nb have shown beneficial effects with respect to stabilizing the cubic BSCF phase (3). Particularly 10 mol-% Y-doped BSCF (BSCF10Y) largely reduces or suppresses secondary phase formation and preserves the long-term conductivity of dense ceramic bulk samples (4,5).…”

Section: Introductionmentioning

confidence: 99%

(Invited) Enhancing Phase Stability and CO₂Tolerance of Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ

et al. 2017

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The effect of B-site cation substitution on the phase stability of Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ (BSCF) in O 2 -and CO 2 -containing atmospheres has been studied thoroughly by our group. In particular, a doping concentration of 10 mol-% yttrium (Y) was found to strongly reduce or suppress secondary phase formation extending the stability of the cubic phase regime. Characterization by electrochemical impedance spectroscopy (EIS) of both, pure and Y-doped BSCF electrodes, is performed in oxygen-nitrogen mixtures as well as in CO 2 -containing atmospheres using symmetrical SOFC cells with Ce 0.9 Gd 0.1 O 2-δ (CGO) as electrolyte from 600 to 900 °C. Analysis of the EIS data in combination with the distribution of relaxation times (DRT) reveals an enhanced tolerance of the Y-doped BSCF cathodes towards the adsorption of CO 2 molecules. The enhanced stability of the cubic phase and reduced poisoning effect on the oxygen reduction reaction in CO 2containing atmospheres by doping, is further confirmed by scanning electron microscopy (SEM) and analytical (scanning) transmission electron microscopy ((S)TEM) combined with energy dispersive X-ray spectroscopy (EDXS).

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Electrifying Ba0.5Sr0.5Co0.8Fe0.2O3− for focalized heating in oxygen transport membranes

Laqdiem,

García-Fayos,

Almar

et al. 2024

Journal of Energy Chemistry

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(Invited) The Effect of Dopants on the Stabilization of the Cubic BSCF Phase in O ₂ - and CO ₂ -Containing Atmospheres

Cited by 3 publications

References 8 publications

Temperature-Induced Structural Reorganization of W-Doped Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3−δ Composite Membranes for Air Separation

Temperature-Induced Structural Reorganization of W-Doped Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3−δ Composite Membranes for Air Separation

(Invited) Enhancing Phase Stability and CO₂Tolerance of Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ

Electrifying Ba0.5Sr0.5Co0.8Fe0.2O3− for focalized heating in oxygen transport membranes

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(Invited) The Effect of Dopants on the Stabilization of the Cubic BSCF Phase in O 2 - and CO 2 -Containing Atmospheres

Cited by 3 publications

References 8 publications

Temperature-Induced Structural Reorganization of W-Doped Ba0.5Sr0.5Co0.8Fe0.2O3−δ Composite Membranes for Air Separation

Temperature-Induced Structural Reorganization of W-Doped Ba0.5Sr0.5Co0.8Fe0.2O3−δ Composite Membranes for Air Separation

(Invited) Enhancing Phase Stability and CO2Tolerance of Ba0.5Sr0.5Co0.8Fe0.2O3-δ

Electrifying Ba0.5Sr0.5Co0.8Fe0.2O3− for focalized heating in oxygen transport membranes

Contact Info

Product

Resources

About

(Invited) The Effect of Dopants on the Stabilization of the Cubic BSCF Phase in O ₂ - and CO ₂ -Containing Atmospheres

Temperature-Induced Structural Reorganization of W-Doped Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3−δ Composite Membranes for Air Separation

Temperature-Induced Structural Reorganization of W-Doped Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3−δ Composite Membranes for Air Separation

(Invited) Enhancing Phase Stability and CO₂Tolerance of Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ