Phase Equilibria and Structure of Solid Solutions in the La–Co–Fe–O System at 1100°C

Proskurina, N. V.; Черепанов, В.А.; Golynets, O. S.; Воронин, В. И.

doi:10.1023/b:inma.0000041328.85504.3d

Cited by 19 publications

(12 citation statements)

References 7 publications

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“…Increasing the Fe content in the precursor solution (samples with 40 at.% Fe and 60 at.% Fe) induce a shift on the main reflections to smaller angles suggesting an expansion of perovskite lattice parameters due to Fe substitution. Such a shift has been previously reported and supports the substitution of Fe 3+ into LaCoO 3 . Additionally, the main reflection for 60 at.% Fe‐substituted LaCoO 3 perovskite phases (at ∼2θ=37.9°) is observed as a single peak, while for lower Fe substitution a broadening of the main peaks was detected.…”

Section: Resultssupporting

confidence: 87%

Spray‐Flame‐Synthesized LaCo_1−xFe_xO₃ Perovskite Nanoparticles as Electrocatalysts for Water and Ethanol Oxidation

et al. 2019

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Coupling electrochemical generation of hydrogen with the concomitant formation of an industrially valuable product at the anode instead of oxygen can balance the high costs usually associated with water electrolysis. We report the synthesis of a variety of nanoparticulate LaCo1−xFexO3 perovskite materials through a specifically optimized spray‐flame nanoparticle synthesis method, using different ratios of La, Co, and Fe precursor compounds. Structural characterization of the resulting materials by XRD, TEM, FTIR, and XPS analysis revealed the formation of mainly perovskite‐type materials. The electrocatalytic performance of the formed perovskite‐type materials towards the oxygen evolution reaction and the ethanol oxidation reaction was investigated by using rotating disk electrode voltammetry. An increased Fe content in the precursor mixture leads to a decrease in the electrocatalytic activity of the nanoparticles. The selectivity towards alcohol oxidation in alkaline media was assessed by using the ethanol oxidation reaction as a model reaction. Operando electrochemistry/ATR‐IR spectroscopy results reveal that acetate and acetaldehyde are the final products, depending on the catalyst composition as well as on the applied potential.

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Section: Resultssupporting

confidence: 87%

Spray‐Flame‐Synthesized LaCo_1−xFe_xO₃ Perovskite Nanoparticles as Electrocatalysts for Water and Ethanol Oxidation

et al. 2019

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“…In the normal spinel structure, the A sites are occupied by divalent cations and the B sites by trivalent cations. In the inverse spinel structure, the divalent cations occupy half of the B sites and the trivalent cations occupy the remaining A and B sites (Proskurina et al, 2004). For cobalt ferrite, the inverse structure is the most stable.…”

Section: Introductionmentioning

confidence: 99%

Epitaxial growth and structure of cobalt ferrite thin films with large inversion parameter on Ag(001)

Santis

Bailly

Coates

et al. 2019

Acta Crystallogr Sect B

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Cobalt ferrite ultrathin films with the inverse spinel structure are among the best candidates for spin filtering at room temperature. High‐quality epitaxial CoFe2O4 films about 4 nm thick have been fabricated on Ag(001) following a three‐step method: an ultrathin metallic CoFe2 alloy was first grown in coherent epitaxy on the substrate and then treated twice with O2, first at room temperature and then during annealing. The epitaxial orientation and the surface, interface and film structure were resolved using a combination of low‐energy electron diffraction, scanning tunnelling microscopy, Auger electron spectroscopy and in situ grazing‐incidence X‐ray diffraction. A slight tetragonal distortion was observed, which should drive the easy magnetization axis in‐plane due to the large magneto‐elastic coupling of such a material. The so‐called inversion parameter, i.e. the Co fraction occupying octahedral sites in the ferrite spinel structure, is a key element for its spin‐dependent electronic gap. It was obtained through in situ resonant X‐ray diffraction measurements collected at both the Co and Fe K edges. The data analysis was performed using FDMNES, an ab initio program already extensively used to simulate X‐ray absorption spectroscopy, and shows that the Co ions are predominantly located on octahedral sites with an inversion parameter of 0.88 (5). Ex situ X‐ray photoelectron spectroscopy gives an estimation in accordance with the values obtained through diffraction analysis.

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“…For most of the above mentioned applications, a successful use of lanthanum cobaltite was however limited by lack of knowledge on phase stability of oxide phases under various operating conditions (temperature and oxygen partial pressure). The La-Co-O system has been investigated previously, with efforts on either experimental determination of thermodynamic or thermochemical properties [4][5][6][7][8][9][10][11] or thermodynamic modeling [12,13].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Modeling of the La-Co-O System

Zhang

Povoden-Karadeniz

et al. 2019

J. Phase Equilib. Diffus.

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Phase Equilibria and Structure of Solid Solutions in the La–Co–Fe–O System at 1100°C

Cited by 19 publications

References 7 publications

Spray‐Flame‐Synthesized LaCo_1−xFe_xO₃ Perovskite Nanoparticles as Electrocatalysts for Water and Ethanol Oxidation

Spray‐Flame‐Synthesized LaCo_1−xFe_xO₃ Perovskite Nanoparticles as Electrocatalysts for Water and Ethanol Oxidation

Epitaxial growth and structure of cobalt ferrite thin films with large inversion parameter on Ag(001)

Thermodynamic Modeling of the La-Co-O System

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Phase Equilibria and Structure of Solid Solutions in the La–Co–Fe–O System at 1100°C

Cited by 19 publications

References 7 publications

Spray‐Flame‐Synthesized LaCo1−xFexO3 Perovskite Nanoparticles as Electrocatalysts for Water and Ethanol Oxidation

Spray‐Flame‐Synthesized LaCo1−xFexO3 Perovskite Nanoparticles as Electrocatalysts for Water and Ethanol Oxidation

Epitaxial growth and structure of cobalt ferrite thin films with large inversion parameter on Ag(001)

Thermodynamic Modeling of the La-Co-O System

Contact Info

Product

Resources

About

Spray‐Flame‐Synthesized LaCo_1−xFe_xO₃ Perovskite Nanoparticles as Electrocatalysts for Water and Ethanol Oxidation

Spray‐Flame‐Synthesized LaCo_1−xFe_xO₃ Perovskite Nanoparticles as Electrocatalysts for Water and Ethanol Oxidation