Reverse cation segregation and crack self-healing of Ba0.3Sr0.7Fe0.9Mo0.1O3-δ perovskite four-channel hollow fiber membrane

Tan, Jinkun; Wang, Shoufei; Fan, Zheng; Zhang, Zhicheng; Jiang, Kaiping; Wang, Tianlei; Liu, Zhengkun; Zhang, Guangru; Jin, Wanqin

doi:10.1016/j.memsci.2021.119753

Cited by 9 publications

(4 citation statements)

References 65 publications

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“…In the H 2 -containing atmosphere conditions at the Ba 0.3 Sr 0.7 Fe 0.9 Mo 0.1 O 3− δ surface after 24 hours annealing, 172 the intensity of the Mo 5+ peak does not change, while the Fe 2+ peak increases, which is due to the reduction of Fe 3+ and Fe 4+ . H 2 -annealing favours the reduction of transition metals, which increases the lattice parameter and consequently facilitates the back segregation of cations, also heat treatment in hydrogen leads to self-healing of defects, Fig.…”

Section: Characterization Of Surface Segregation: Approachesmentioning

confidence: 91%

“…For the electrolyte materials La 2 Mo 2 O 9 and La 2 (MoO 4 ) 3 , under the conditions of annealing at 600 °C and transition from ultrahigh vacuum to 2 × 10 −3 atm O 2 , the amount of Mo increases, and when thermo-chemical equilibrium is reached, the La/Mo ratio increases from 2/1.83 and 2/3.36, and levels off for both samples at 2/3.36 and 2/3.37. 174 In the H 2 -containing atmosphere conditions at the Ba 0.3 -Sr 0.7 Fe 0.9 Mo 0.1 O 3−d surface aer 24 hours annealing, 172 the intensity of the Mo 5+ peak does not change, while the Fe 2+ peak increases, which is due to the reduction of Fe 3+ and Fe 4+ . H 2annealing favours the reduction of transition metals, which increases the lattice parameter and consequently facilitates the back segregation of cations, also heat treatment in hydrogen leads to self-healing of defects, Fig.…”

Section: Different Atmospheresmentioning

confidence: 97%

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Segregation and interdiffusion processes in perovskites: a review of recent advances

Porotnikova,

Osinkin

2024

J. Mater. Chem. A

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Section: Characterization Of Surface Segregation: Approachesmentioning

confidence: 91%

Section: Different Atmospheresmentioning

confidence: 97%

Segregation and interdiffusion processes in perovskites: a review of recent advances

Porotnikova,

Osinkin

2024

J. Mater. Chem. A

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“…These impurities can be incorporated into the perovskite lattice or remain on the surface, negatively affecting the oxygen permeation of the material. 17,18 Liu et al investigated the effects of CuO additives on sintering behaviors, crystal structure, and oxygen permeation of SrCo 0.9 Nb 0.1 O 3Àδ membranes. 13 They demonstrated that copper could be incorporated into the perovskite lattices, but it would decrease the oxygen permeation flux and also result in a change in the microstructure and local composition of the membranes.…”

Section: Introductionmentioning

confidence: 99%

“…One major issue is the introduction of impurities during the sintering process. These impurities can be incorporated into the perovskite lattice or remain on the surface, negatively affecting the oxygen permeation of the material 17,18 . Liu et al investigated the effects of CuO additives on sintering behaviors, crystal structure, and oxygen permeation of SrCo 0.9 Nb 0.1 O 3−δ membranes 13 .…”

Section: Introductionmentioning

confidence: 99%

Cold sintering of perovskite‐based mixed conducting membrane for oxygen separation

Zhou,

Fan,

Jiang

et al. 2024

AIChE Journal

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Cold sintering has attracted significant attention as its remarkably rapid densification process at low sintering temperatures leads to considerable energy savings. However, the sintering behaviors of cold‐sintered perovskite ceramics remain poorly understood and lack precise control over material microstructure. Here, we fabricated dense SrCo0.8Fe0.2O3−δ (SCF) ceramic oxygen permeation membranes by cold sintering. Adding an appropriate ratio of sub‐micron SCF particles can better bridge the sintering interspaces between micron particles, generate amorphous phase through “dissolution‐precipitation,” and aid in the initial densification. The average relative density of SCF membranes undergoes a significant increase to 95.9% after cold sintering and post‐annealing at 900°C, which is much lower than the temperature required for conventional high‐temperature solid‐state sintering (>1200°C). The oxygen permeation flux of the prepared SCF perovskite membrane reaches 2.8 mL min−1 cm−2, which proves that this method has the potential to be an excellent sintering technique for dense perovskite ceramic membranes.

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An Angstrom‐Scale Protective Skin Grown In Situ on Perovskite Oxide to Enhance Stability in Water

Zhou,

Xu,

Tan

et al. 2024

Angewandte Chemie

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The utilization of perovskite oxide as a catalyst for aqueous reactions is promising but challenging in stability. Here, we propose an in situ growth strategy that constructs an ultrathin protective skin on the Sr0.9Fe0.81Ta0.09Ni0.1O3‐δ perovskite surface and thus effectively solves the stability issue. Using a spherical aberration‐corrected transmission electron microscope, we observe the coexistence of an angstrom‐scale (~7 Å) Fe2O3 protective skin and FeNi alloy nanoparticles. A number of alloy nanoparticles grow along with the skin and uniformly take root on the skin surface. Such a hierarchical structure can reconstruct the surface electronic structure and suppress the ion leaching of perovskite oxide in water. Benefiting from this unique structure, the catalyst has experienced a substantial increase (800 h, more than three orders of magnitude) in its stable operation time in water (for example, in a hydrogen evolution reaction). These results provide valuable insight into solid‐solid phase transitions and have substantial implications for using structural defects at surfaces to modulate mass transport and transformation kinetics. Our strategy is sufficiently simple and can be used to subtly manipulate the catalyst structures to improve the performance of perovskite‐based catalysts and potentially other oxide catalysts for a wide range of reactions.

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Reverse cation segregation and crack self-healing of Ba0.3Sr0.7Fe0.9Mo0.1O3-δ perovskite four-channel hollow fiber membrane

Cited by 9 publications

References 65 publications

Segregation and interdiffusion processes in perovskites: a review of recent advances

Segregation and interdiffusion processes in perovskites: a review of recent advances

Cold sintering of perovskite‐based mixed conducting membrane for oxygen separation

An Angstrom‐Scale Protective Skin Grown In Situ on Perovskite Oxide to Enhance Stability in Water

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