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

Porotnikova, Natalia; Osinkin, Denis

doi:10.1039/d3ta06708d

Cited by 7 publications

(3 citation statements)

References 274 publications

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“…The degradation of the single cell is due most likely to the coarsening of the impregnated LSCF nanoparticles, which is possibly due to the lack of strong interaction between the nanoparticles and scaffolds [50,51]. In addition, the high tendency for Sr surface segregation and its migration and interaction with 8YSZ under cathodic polarization could be another reason for the degradation of the cathode [52,53]. On the other hand, Ni coarsening has been considered as the most detrimental degradation mechanism in SOFC anode electrodes, which may also lead to worse stability with both reduced TBP sites and electrical conductivity [54].…”

Section: Microstructure Characterizationmentioning

confidence: 99%

A High-Strength Solid Oxide Fuel Cell Supported by an Ordered Porous Cathode Membrane

Chen,

Zhang,

Zheng

et al. 2024

Membranes

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The Pphase inversion tape casting has been widely used to fabricate open straight porous supports for solid oxide fuel cells (SOFCs), which can offer better gas transmission and minimize the concentration polarization. However, the overall weak strength of the macro-porous structure still limits the applications of these SOFCs. In this work, a novel SOFC supported by an ordered porous cathode membrane with a four-layer configuration containing a finger-like porous 3 mol% yttria- stabilized zirconia (3YSZ)-La0.8Sr0.2Co0.6Fe0.4O3−δ (LSCF) catalyst, porous 8 mol% yttria-stabilized zirconia (8YSZ)-LSCF catalyst, and dense 8YSZ porous 8YSZ-NiO catalyst is successfully prepared by the phase inversion tape casting, dip-coating, co-sintering, and impregnation process. The flexural strength of the open straight porous 3YSZ membrane is as high as 131.95 MPa, which meets the requirement for SOFCs. The cathode-supported single cell shows a peak power density of 540 mW cm−2 at 850 °C using H2 as the fuel. The degradation mechanism of the SOFC is investigated by the combination of microstructure characterization and distribution of relaxation times (DRT) analysis.

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Section: Microstructure Characterizationmentioning

confidence: 99%

A High-Strength Solid Oxide Fuel Cell Supported by an Ordered Porous Cathode Membrane

Chen,

Zhang,

Zheng

et al. 2024

Membranes

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“…SrFeO 3−δ -based materials are the most widely studied for cathodes in iron-based systems. Other researchers have shown that the structure of SrFeO 3−δ varies significantly with the temperature and oxygen partial pressure [24][25][26][27][28][29][30][31][32][33][34][35][36]. Jiang et al introduced high-valence Nb into Fe and found that the modification of Nb enhanced the stability of the crystal and effectively avoided the phase transition.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Cathode Performance in Pr0.5Sr0.5FeO3−δ of Perovskite Catalytic Materials via Doping with VB Subgroup Elements (V, Nb, and Ta)

Chen,

Lü,

2024

Materials

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Perovskite-style materials are cathode systems known for their stability in solid oxide fuel cells (SOFCs). Pr0.5Sr0.5FeO3−δ (PSF) exhibits excellent electrode performance in perovskite cathode systems at high temperatures. Via VB subgroup metals (V, Nb, and Ta) modifying the B-site, the oxidation and spin states of iron elements can be adjusted, thereby ultimately adjusting the cathode’s physicochemical properties. Theoretical predictions indicate that PSF has poor stability, but the relative arrangement of the three elements on the B-site can significantly improve this material’s properties. The modification of Nb has a large effect on the stability of PSF cathode materials, reaching a level of −2.746 eV. The surface structure of PSF becomes slightly more stable with an increase in the percentage of oxygen vacancy structures, but the structural instability persists. Furthermore, the differential charge density distribution and adsorption state density of the three modified cathode materials validate our adsorption energy prediction results. The initial and final states of the VB subgroup metal-doped PSF indicate that PSFN is more likely to complete the cathode surface adsorption reaction. Interestingly, XRD and EDX characterization are performed on the synthesized pure and Nb-doped PSF material, which show the orthorhombic crystal system of the composite theoretical model structure and subsequent experimental components. Although PSF exhibits strong catalytic activity, it is highly prone to decomposition and instability at high temperatures. Furthermore, PSFN, with the introduction of Nb, shows greater stability and can maintain its activity for the ORR. EIS testing clearly indicates that Nb most significantly improves the cathode. The consistency between the theoretical predictions and experimental validations indicates that Nb-doped PSF is a stable and highly active cathode electrode material with excellent catalytic activity.

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“…The cobaltites that usually contain alkaline earth metal oxides are plagued by cation surface segregation, leading to a reduction in active surface and degradation in stability over time. − The surface segregated alkaline oxides such as SrO and BaO possess a Smith acidity scale of −9.4 and −10.8, and the removal of these species based on acid–base reaction principle has been identified as an effective strategy to address this issue. Zhuang et al used the acidic oxide Mn 2 O 3 to capture the segregated SrO on the LSCF surface, creating Sr defects and additional oxygen vacancies on the surface and thereby enhancing the electrochemical performance and stability of LSCF .…”

Section: Introductionmentioning

confidence: 99%

Surface Chemistry Modulation of BaGd_0.8La_0.2Co₂O_6−δ As Active Air Electrode for Solid Oxide Cells

Chen,

Weng,

Yue

et al. 2024

ACS Appl. Mater. Interfaces

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

Abstract: This review focuses on recent advances in the study of segregation processes, namely modeling, segregation on single and polycrystalline samples, effects of polarization, interdiffusion, different atmospheres and exsolution of nanoparticles.

Cited by 7 publications

References 274 publications

A High-Strength Solid Oxide Fuel Cell Supported by an Ordered Porous Cathode Membrane

A High-Strength Solid Oxide Fuel Cell Supported by an Ordered Porous Cathode Membrane

Enhanced Cathode Performance in Pr0.5Sr0.5FeO3−δ of Perovskite Catalytic Materials via Doping with VB Subgroup Elements (V, Nb, and Ta)

Surface Chemistry Modulation of BaGd_0.8La_0.2Co₂O_6−δ As Active Air Electrode for Solid Oxide Cells

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

Abstract: This review focuses on recent advances in the study of segregation processes, namely modeling, segregation on single and polycrystalline samples, effects of polarization, interdiffusion, different atmospheres and exsolution of nanoparticles.

Cited by 7 publications

References 274 publications

A High-Strength Solid Oxide Fuel Cell Supported by an Ordered Porous Cathode Membrane

A High-Strength Solid Oxide Fuel Cell Supported by an Ordered Porous Cathode Membrane

Enhanced Cathode Performance in Pr0.5Sr0.5FeO3−δ of Perovskite Catalytic Materials via Doping with VB Subgroup Elements (V, Nb, and Ta)

Surface Chemistry Modulation of BaGd0.8La0.2Co2O6−δ As Active Air Electrode for Solid Oxide Cells

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Surface Chemistry Modulation of BaGd_0.8La_0.2Co₂O_6−δ As Active Air Electrode for Solid Oxide Cells