Synthesis and Characterization of LaCoxFe1-xO3 (0≤x≤1) Nano-Crystal Powders by Pechini Type Sol–Gel Method

Derakhshi, Zahra; Tamizifar, Morteza; Arzani, Kaveh; Baghshahi, Saeid

doi:10.1080/15533174.2014.900628

Cited by 11 publications

(3 citation statements)

References 25 publications

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“…The evolution of rhombohedral LaCoO 3 is in good agreement with the literature, where the transition was also reported for x � 0.40 in LaFe 1À x Co x O 3 . [33] In addition, for x > 0.40, a minor amount of Fe 3-x Co x O 4 spinel phase was formed. A possible reason for this is cation segregation upon LDH formation.…”

Section: Synthesis and Materials Characterizationmentioning

confidence: 98%

The Effect of Water on the 2‐Propanol Oxidation Activity of Co‐Substituted LaFe_1−xCo_xO₃ Perovskites

Dreyer

Cruz

Hagemann

et al. 2021

Chemistry A European J

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Perovskites are interesting oxidation catalysts due to their chemical flexibility enabling the tuning of several properties. In this work, we synthesized LaFe1−xCoxO3 catalysts by co‐precipitation and thermal decomposition, characterized them thoroughly and studied their 2‐propanol oxidation activity under dry and wet conditions to bridge the knowledge gap between gas and liquid phase reactions. Transient tests showed a highly active, unstable low‐temperature (LT) reaction channel in conversion profiles and a stable, less‐active high‐temperature (HT) channel. Cobalt incorporation had a positive effect on the activity. The effect of water was negative on the LT channel, whereas the HT channel activity was boosted for x>0.15. The boost may originate from a slower deactivation rate of the Co3+ sites under wet conditions and a higher amount of hydroxide species on the surface comparing wet to dry feeds. Water addition resulted in a slower deactivation for Co‐rich catalysts and higher activity in the HT channel state.

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Section: Synthesis and Materials Characterizationmentioning

confidence: 98%

The Effect of Water on the 2‐Propanol Oxidation Activity of Co‐Substituted LaFe_1−xCo_xO₃ Perovskites

Dreyer

Cruz

Hagemann

et al. 2021

Chemistry A European J

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“…For crystallization of the material, thermal treatment of at least 500 • C is necessary [1]. Perovskite oxides with lanthanum (La) as the A-site cation and cobalt (Co) and iron (Fe) as the B-site cations have been synthesized via thermal decomposition of propionates [21], the Pechini method [22], or the sol-gel approach [23]. The synthesis of LaFe x Co 1−x O 3 via co-precipitation assisted by microwaves has been reported [24].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Co Incorporation on the CO Oxidation Activity of LaFe1−xCoxO3 Perovskites

et al. 2021

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Perovskite oxides are versatile materials due to their wide variety of compositions offering promising catalytic properties, especially in oxidation reactions. In the presented study, LaFe1−xCoxO3 perovskites were synthesized by hydroxycarbonate precursor co-precipitation and thermal decomposition thereof. Precursor and calcined materials were studied by scanning electron microscopy (SEM), attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), thermogravimetric analysis (TG), and X-ray powder diffraction (XRD). The calcined catalysts were in addition studied by transmission electron microscopy (TEM) and N2 physisorption. The obtained perovskites were applied as catalysts in transient CO oxidation, and in operando studies of CO oxidation in diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). A pronounced increase in activity was already observed by incorporating 5% cobalt into the structure, which continued, though not linearly, at higher loadings. This could be most likely due to the enhanced redox properties as inferred by H2-temperature programmed reduction (H2-TPR). Catalysts with higher Co contents showing higher activities suffered less from surface deactivation related to carbonate poisoning. Despite the similarity in the crystalline structures upon Co incorporation, we observed a different promotion or suppression of various carbonate-related bands, which could indicate different surface properties of the catalysts, subsequently resulting in the observed non-linear CO oxidation activity trend at higher Co contents.

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“…In this sense, the sol-gel method results in smaller grain sizes than the solid-state reaction method. In fact, the Pechini method is known for delivering homogeneous solutions with a great control of composition and production of ultrafine nanometric oxides [70,71], which makes this method very attractive for recent developments and future trends in the field of Ni/MH batteries (see ''Drawbacks and future challenges''). Compared with the solid-state reaction, the glycine-nitrate route and the solgel technique require lower calcination temperatures and reduced calcination times to yield pure crystals of perovskite-type oxides.…”

Section: Synthesis Of Rare-earth Perovskite-type Oxides For Applicatimentioning

confidence: 99%

Review: on rare-earth perovskite-type negative electrodes in nickel–hydride (Ni/H) secondary batteries

Henao

Martínez-Gómez

2017

Mater Renew Sustain Energy

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Rare-earth perovskites-type oxides are compounds with the general formula ABO 3 . There are many industrial and research applications related to their properties such as photocatalytic activity, magnetism, or pyroferro and piezo-electricity, and interest in these compounds in the field of energy storage and conversion is growing. Rare-earth perovskite-type oxides may be used in nickelmetal hydride (Ni/MH) battery technology because these materials may store hydrogen in strong alkaline environments, and also because of their abundance and low cost. In this review, the use of rare-earth perovskite-type oxides in Ni/MH batteries is described, starting from their crystalline structure and production methods. In each category, a description concerning the latest advances and future research direction is presented. Electrochemical performance of the perovskite-type electrodes is reviewed extensively. In addition, various strategies for enhancing their hydrogen storage capacity as a negative electrode in hydrogen batteries are discussed. Drawbacks and challenges of this technology are also presented.

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Synthesis and Characterization of LaCo_xFe_1-xO₃ (0≤x≤1) Nano-Crystal Powders by Pechini Type Sol–Gel Method

Cited by 11 publications

References 25 publications

The Effect of Water on the 2‐Propanol Oxidation Activity of Co‐Substituted LaFe_1−xCo_xO₃ Perovskites

The Effect of Water on the 2‐Propanol Oxidation Activity of Co‐Substituted LaFe_1−xCo_xO₃ Perovskites

The Effect of Co Incorporation on the CO Oxidation Activity of LaFe1−xCoxO3 Perovskites

Review: on rare-earth perovskite-type negative electrodes in nickel–hydride (Ni/H) secondary batteries

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Synthesis and Characterization of LaCoxFe1-xO3 (0≤x≤1) Nano-Crystal Powders by Pechini Type Sol–Gel Method

Cited by 11 publications

References 25 publications

The Effect of Water on the 2‐Propanol Oxidation Activity of Co‐Substituted LaFe1−xCoxO3 Perovskites

The Effect of Water on the 2‐Propanol Oxidation Activity of Co‐Substituted LaFe1−xCoxO3 Perovskites

The Effect of Co Incorporation on the CO Oxidation Activity of LaFe1−xCoxO3 Perovskites

Review: on rare-earth perovskite-type negative electrodes in nickel–hydride (Ni/H) secondary batteries

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Synthesis and Characterization of LaCo_xFe_1-xO₃ (0≤x≤1) Nano-Crystal Powders by Pechini Type Sol–Gel Method

The Effect of Water on the 2‐Propanol Oxidation Activity of Co‐Substituted LaFe_1−xCo_xO₃ Perovskites

The Effect of Water on the 2‐Propanol Oxidation Activity of Co‐Substituted LaFe_1−xCo_xO₃ Perovskites