Sol-gel synthesis and structure of La2O3-CoO-SiO2 powders

Radev, Lachezar; Pavlova, L.; Samuneva, B.; Kashchieva, E.; Mihailova, Irena; Zaharescu, Maria; Malič, Barbara; Predoană, Luminița

doi:10.2298/pac0802103r

Cited by 15 publications

(5 citation statements)

References 18 publications

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“…A peak at 508 cm −1 is ascribed to the Co–O bond as reported by Sarker and Razzaque [ 28 ], and Worayingyong et al [ 30 ]. The La–O bond as confirmed by Radev et al [ 31 ], corresponds to the peak at 410 cm −1 . The Raman spectra shown in Figure 1 c illustrates typical characteristics of LaCoO 3 at 478 cm −1 , confirming the formation of La–O [ 32 ].…”

Section: Resultssupporting

confidence: 55%

Effect of LaCoO3 Synthesized via Solid-State Method on the Hydrogen Storage Properties of MgH2

et al. 2023

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One of the ideal energy carriers for the future is hydrogen. It has a high energy density and is a source of clean energy. A crucial step in the development of the hydrogen economy is the safety and affordable storage of a large amount of hydrogen. Thus, owing to its large storage capacity, good reversibility, and low cost, Magnesium hydride (MgH2) was taken into consideration. Unfortunately, MgH2 has a high desorption temperature and slow ab/desorption kinetics. Using the ball milling technique, adding cobalt lanthanum oxide (LaCoO3) to MgH2 improves its hydrogen storage performance. The results show that adding 10 wt.% LaCoO3 relatively lowers the starting hydrogen release, compared with pure MgH2 and milled MgH2. On the other hand, faster ab/desorption after the introduction of 10 wt.% LaCoO3 could be observed when compared with milled MgH2 under the same circumstances. Besides this, the apparent activation energy for MgH2–10 wt.% LaCoO3 was greatly reduced when compared with that of milled MgH2. From the X-ray diffraction analysis, it could be shown that in-situ forms of MgO, CoO, and La2O3, produced from the reactions between MgH2 and LaCoO3, play a vital role in enhancing the properties of hydrogen storage of MgH2.

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Section: Resultssupporting

confidence: 55%

Effect of LaCoO3 Synthesized via Solid-State Method on the Hydrogen Storage Properties of MgH2

et al. 2023

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“…Nevertheless, it has been demonstrated that its microstructure, catalytic performance, and electronic and ionic conductivity depend strongly on the preparation method, which ultimately determines its potential applications [22]. For example, developing of reliable methods for obtaining nanosized LaCoO 3 powders with large specific surface area to be used as electrocatalysts is an active research field nowadays [23].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Nanosized LaCoO₃through Calcination of a Hydrothermally Synthesized Precursor

Tepech-Carrillo

Escobedo-Morales

Pérez-Centeno³

et al. 2016

Journal of Nanomaterials

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A method for obtaining nanosized LaCoO3crystals from calcination of a precursor powder synthesized by a hydrothermal route is reported. Details concerning the evolution of the microstructure and formation mechanism of the perovskite phase were studied by powder X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, Raman spectroscopy, and thermal analysis. It was found that the morphology of the sample progressively turns from a mix of fibers and rods to interconnected nanocrystals. It is determined that LaCoO3phase is produced by a reaction of cobalt and lanthanum oxides, the latter produced by a two-step dehydration process of La(OH)3. Finally, it was found that nearly stoichiometric LaCoO3nanocrystals can be obtained at temperatures as low as 850°C. Nevertheless, whether higher calcination temperatures are used, appropriate reaction times and a controlled atmosphere are required in order to avoid formation of lanthanum carbonates and high density of lattice defects.

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“…The characteristic vibration peaks for stretching N = O also appear at 1649, 1646, and 1640 cm -1 respectively in black powder samples 60, 70, and 80 ºC which were previously shifted at wave number 1634 cm -1 in the forming material (Lanthanum Nitrate Hexahydrate). Whereas La-O chemical bonding group based on literature shows the wavenumber 415-423 cm -1 (Radev et al, 2008). However, Figure 12 only covers the range of 500-4000 cm -1 .…”

Section: Fourier Transform Infrared (Ftir) Analysismentioning

confidence: 94%

A Physical Chemistry Study of Black Powder Materials by Solution Combustion Synthesis Method

et al. 2021

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A study on the synthesis of black powder (La2NiO4) material using the solution combustion synthesis method at a variation of synthesis temperature of 60, 70, and 80Â°C was carried out. It produces a mass of black powder of 2 grams by four times of synthesis process. Then, material characterization was performed on the black powder samples obtained by using X-ray Diffraction (XRD) to determine the phases formed, Scanning Electron Microscopy - Energy Dispersive X-ray Spectroscopy (SEM-EDS) to determine the morphology and analyze the composition elemental on the microscale and Fourier Transform Infra-Red (FTIR) to determine chemical bonds. From the whole black powder sample, XRD analysis showed the phases of Dilantanum Nickel Tetraoxide (La2NiO4), Nickel Oxide (NiO), Lanthanum Oxide (La2O3), and Lanthanum Oxide Ht x-form (La2O3 Ht (x-form)). In addition, it was seen from the visible compositions of the phases that the NiO phase looks more dominant and the variation of the synthesis temperature shows that the La2O3 phase was increasing. This was supported by the EDS analysis, which showed that the EDS spectrum contains elements La, Ni, and O where the element O indicates that oxidation occurs in the elements Ni and La. On the other hand, the SEM analysis results confirm that the black powder sample contains the elements La and Ni, based on the high and low electron images contained in the morphology of the black powder sample. In addition, it was also known that the particles in the black powder sample were micron size and had porous morphology. This occurs due to rapid thermal decomposition events and excessive gas development. In addition, FTIR analysis showed that the O-H bond had been reduced and there are still C-O and C-H bonds indicating the presence of organic elements possessed by glycine.

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Sol-gel synthesis and structure of La2O3-CoO-SiO2 powders

Cited by 15 publications

References 18 publications

Effect of LaCoO3 Synthesized via Solid-State Method on the Hydrogen Storage Properties of MgH2

Effect of LaCoO3 Synthesized via Solid-State Method on the Hydrogen Storage Properties of MgH2

Preparation of Nanosized LaCoO₃through Calcination of a Hydrothermally Synthesized Precursor

A Physical Chemistry Study of Black Powder Materials by Solution Combustion Synthesis Method

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Sol-gel synthesis and structure of La2O3-CoO-SiO2 powders

Cited by 15 publications

References 18 publications

Effect of LaCoO3 Synthesized via Solid-State Method on the Hydrogen Storage Properties of MgH2

Effect of LaCoO3 Synthesized via Solid-State Method on the Hydrogen Storage Properties of MgH2

Preparation of Nanosized LaCoO3through Calcination of a Hydrothermally Synthesized Precursor

A Physical Chemistry Study of Black Powder Materials by Solution Combustion Synthesis Method

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Preparation of Nanosized LaCoO₃through Calcination of a Hydrothermally Synthesized Precursor