Degradation and stabilization of perovskite membranes containing silicon impurity at low temperature

Liu, Yan; Zhu, Xuefeng; Li, Mingrun; Yang, Weishen

doi:10.1016/j.memsci.2015.05.063

Cited by 14 publications

(3 citation statements)

References 43 publications

(42 reference statements)

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“…Similar results have been reported for BaCe 0.1 Co 0.4 Fe 0.5 O 3Àd based oxygen permeation membranes. 56,123 Even for silica concentrations below that needed to achieve complete surface coverage, degradation has been reported. Using time-of-ight secondary ion mass spectrometry (ToF-SIMS) measurements, Optiz et al were able to identify the accumulation of Si-species at the TPB of Pt/YSZ/O 2 that had been highly polarized and exhibited performance degradation, Fig.…”

Section: Oxygen Reduction and Exchange Reactionsmentioning

confidence: 99%

Silica: ubiquitous poison of metal oxide interfaces

et al. 2022

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Section: Oxygen Reduction and Exchange Reactionsmentioning

confidence: 99%

Silica: ubiquitous poison of metal oxide interfaces

et al. 2022

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“…The BSCF membrane is coated with Sm 0.5 Sr 0.5 CoO 3−δ (SSC) catalyst on both surfaces before permeation testing, as prior investigations have shown that degradation associated with the surface oxygen exchange process can be eliminated by this procedure. 15,19,21 Under low-temperature (LT) operation at 600 °C, we observe a dramatic 30% decrease in the oxygen permeation flux during 500 h of on-stream testing (Figure 1b). The changes in the oxygen permeation resistances over time were determined by using a previously developed permeation model (see Supporting Information Figure S4).…”

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confidence: 99%

Nanoparticles at Grain Boundaries Inhibit the Phase Transformation of Perovskite Membrane

Liu

Zhu

et al. 2015

Nano Lett.

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The high-energy nature of grain boundaries makes them a common source of undesirable phase transformations in polycrystalline materials. In both metals and ceramics, such grain-boundary-induced phase transformation can be a frequent cause of performance degradation. Here, we identify a new stabilization mechanism that involves inhibiting phase transformations of perovskite materials by deliberately introducing nanoparticles at the grain boundaries. The nanoparticles act as "roadblocks" that limit the diffusion of metal ions along the grain boundaries and inhibit heterogeneous nucleation and new phase formation. Ba0.5Sr0.5Co0.8Fe0.2O3-δ, a high-performance oxygen permeation and fuel cell cathode material whose commercial application has so far been impeded by phase instability, is used as an example to illustrate the inhibition action of nanoparticles toward the phase transformation. We obtain stable oxygen permeation flux at 600 °C with an unprecedented 10-1000 times increase in performance compared to previous investigations. This grain boundary stabilization method could potentially be extended to other systems that suffer from performance degradation due to a grain-boundary-initiated heterogeneous nucleation phase transformations.

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“…Perovskite oxides, with the general formula ABO 3 , have attracted considerable attention because of their versatile physicochemical properties. [7][8][9] Interestingly, the A sites can be occupied or substituted by different rare-earth or other large metal ions. Similarly, the B sites can be filled with various 3d, 4d or 5d transition metal cations simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Metal Oxides Derived from Perovskite or Spinel for the Selective Hydrogenation of α,β‐Unsaturated Aldehydes: A Mini–Review

Li,

Xin

2024

ChemCatChem

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Mixed metal oxides with perovskite ABO3 or spinel AB2O4 structure can provide uniformly and highly dispersed metal oxides, which can be adopted as catalyst supports, as catalysts directly or as catalysts after reduction. When they are used as catalyst supports, the spatial isolation of A‐site ions with B‐site ions not only makes these ions highly dispersed, but also enhances the intimate contact with the active components supported on them, leading to electron transfer or synergistic effect to promote the catalytic ability. After reduction, highly dispersed A/B nanoparticles supported on BOx/AOx can be achieved for the relevant applications. Herein, recent developments in the liquid‐phase selective hydrogenation of a,b‐unsaturated aldehydes, with metal oxides derived from perovskite or spinel as supports or catalyst precursors, were summarized.

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Degradation and stabilization of perovskite membranes containing silicon impurity at low temperature

Cited by 14 publications

References 43 publications

Silica: ubiquitous poison of metal oxide interfaces

Silica: ubiquitous poison of metal oxide interfaces

Nanoparticles at Grain Boundaries Inhibit the Phase Transformation of Perovskite Membrane

Metal Oxides Derived from Perovskite or Spinel for the Selective Hydrogenation of α,β‐Unsaturated Aldehydes: A Mini–Review

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