Improvement of Ba0.5Sr0.5Co0.8Fe0.2O3−δ functional properties by partial substitution of cobalt with tungsten

Попов, М. П.; Starkov, I. A.; Bychkov, S. F.; Nemudry, A. P.

doi:10.1016/j.memsci.2014.06.022

Cited by 63 publications

(19 citation statements)

References 44 publications

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“…In order to describe the oxygen transport in the hollow fiber membranes, we propose a model based on the semi-empirical dependence of the oxygen flux (JO 2 ) on the partial pressures of oxygen, which is generally used in the case of planar membranes [9][10][11][12][13] and was rationalized by the oxygen transport model presented in [14]:…”

Section: Methodsmentioning

confidence: 99%

Direct AC/DC Heating of Oxygen Transport Membranes

et al. 2019

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This article is devoted to the development of the direct resistive heating of oxygen transport membranes technique. In this case, DC was selected to perform direct heating. The effect of DC on the oxygen fluxes and the microstructure of the membrane was studied. It is shown that in the short-term experiment with DC, a positive significant effect on the oxygen transport was found, while sample exposure under the influence of DC for a long period of time had a significant negative effect on the microstructure of the membrane.

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Section: Methodsmentioning

confidence: 99%

Direct AC/DC Heating of Oxygen Transport Membranes

et al. 2019

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“…Unfortunately, it still lacks some details regarding CO 2 resistance and the state of cobalt ions with B site stabilizing cations in the open literature. Recently, tungsten was applied into B site to stabilize the cobalt ion . With the help of tough tungsten, SrCo 1−x W x O 3−δ and Ba 0.5 Sr 0.5 Co 0.8 Fe 0.1 W 0.1 O 3−δ with highly stable cubic perovskite structure have been successfully developed.…”

Section: Introductionmentioning

confidence: 99%

Lead and tungsten double stabilizing cobalt‐based perovskite oxygen permeation membranes for clean energy delivery

et al. 2020

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Summary In this work, a double site stabilizing cobalt‐based perovskite strategy is proposed to enable the feasibility of the oxygen separation membrane. In order to achieve the excellent material stability, the inherently robust lead and tungsten were selected to stabilize cobalt‐containing perovskite, respectively. PbxSr1−xCo1−yWyO3−δ (PSCW, 0 ≤ x, y ≤ 1) oxide was prepared by wet chemical process. The oxygen permeation test indicated that Pb and W double site stabilizing strategy is enabling the perovskite membranes to work with decent JO2 over ~2.0 mL cm−2 min−1 observed at 850°C. In addition, the robustness of the PSCW membrane was confirmed by long‐term test against erosive gases (CO2 and H2O) as the oxygen fluxes of Pb0.5Sr0.5Co0.9W0.1O3−δ (PSCW5‐5‐9‐1) membranes reverted back to the initial values of 1.91 mL cm−2 min−1 as these erosive gases were turned off. This result suggests that the double site Pb and W stabilizing technology may open a way to advance the viability of the ceramic membrane technology.

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“…Another strategy to stabilize Co‐containing compounds is B‐site doping by cations with fixed valence state and/or large ionic radius. Beneficial effects have been reported for various B‐site dopants, among them Zr, Nb, B, P, Zn, W, Ni, and Y …”

Section: Introductionmentioning

confidence: 99%

The effect of B‐site Y substitution on cubic phase stabilization in (Ba_0.5Sr_0.5)(Co_0.8Fe_0.2)O_3−δ

et al. 2019

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The cubic phase mixed ionic-electronic conductor (Ba 0.5 Sr 0.5 )(Co 0.8 Fe 0.2 )O 3−δ (BSCF) is well-known for its excellent oxygen ion conductivity and high catalytic activity. However, formation of secondary phases impedes oxygen ion transport and consequentially a widespread application of BSCF as oxygen transport membrane. B-cation substitution by 1, 3 and 10 at.% Y was employed in this work for stabilization of the cubic BSCF phase. Secondary phase formation was quantified on bulk and powder samples exposed to temperatures between 640 and 1100°C with annealing time up to 44 days. The phase composition, cation valence states, and chemical composition of all samples were analyzed by high-resolution analytical electron microscopic techniques. Y doping effectively suppresses the formation of Ba n+1 Co n O 3n+3 (Co 8 O 8 ) (n ≥ 2) and Co x O y phases which would otherwise act as nucleation centers for the highly undesirable hexagonal BSCF phase. This work validates for 10 at.% Y cation substitution perfect stabilization of the cubic BSCF phase at temperatures ≥800°C, while a negligible small volume fraction of the hexagonal BSCF phase was found at lower temperatures. A newly developed model describes the effect of Y doping on the formation of secondary phases and their effective suppression with increasing Y concentration. K E Y W O R D SBSCF, energy dispersive X-ray spectroscopy, oxygen transport membrane, transmission electron microscopy, Y-doping

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Improvement of Ba0.5Sr0.5Co0.8Fe0.2O3−δ functional properties by partial substitution of cobalt with tungsten

Cited by 63 publications

References 44 publications

Direct AC/DC Heating of Oxygen Transport Membranes

Direct AC/DC Heating of Oxygen Transport Membranes

Lead and tungsten double stabilizing cobalt‐based perovskite oxygen permeation membranes for clean energy delivery

The effect of B‐site Y substitution on cubic phase stabilization in (Ba_0.5Sr_0.5)(Co_0.8Fe_0.2)O_3−δ

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Improvement of Ba0.5Sr0.5Co0.8Fe0.2O3−δ functional properties by partial substitution of cobalt with tungsten

Cited by 63 publications

References 44 publications

Direct AC/DC Heating of Oxygen Transport Membranes

Direct AC/DC Heating of Oxygen Transport Membranes

Lead and tungsten double stabilizing cobalt‐based perovskite oxygen permeation membranes for clean energy delivery

The effect of B‐site Y substitution on cubic phase stabilization in (Ba0.5Sr0.5)(Co0.8Fe0.2)O3−δ

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The effect of B‐site Y substitution on cubic phase stabilization in (Ba_0.5Sr_0.5)(Co_0.8Fe_0.2)O_3−δ