Effect of preparation method and B-side metal type on the physicochemical properties of LaBO3 perovskite catalyst and its catalytic behaviour in the biomass pyrolysis

Özbay, Nurgül; Şahin, Rahmiye Zerrin Yarbay

doi:10.1007/s13399-020-00925-5

Cited by 3 publications

(3 citation statements)

References 49 publications

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“…The specific surface area value decreases from 2.59 m 2 /g for the hydrothermal method to 0.30 m 2 /g for the sol-gel method used. These lower BET surface areas of the perovskites fall in agreement with the literature data [7][8][9].…”

Section: Resultssupporting

confidence: 92%

“…The structural properties of perovskites are mostly counting on the preparation method [6]. Perovskite synthesis can be widely done in several methods such as co-precipitation [7], sol-gel [7][8][9] and spray pyrolysis method [10]. Sol-gel method is one of the most fundamental, practical and routine methods which has been used, developed and modified in studies for many years.…”

Section: Introductionmentioning

confidence: 99%

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Sentez Yöntemi ile LSAF Perovskit Morfolojisinin Ayarlanması

Şahin

2021

Bilecik Şeyh Edebali Üniversitesi Fen Bilimleri Dergisi

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Lanthanum strontium aluminum ferrite (La 0.8 Sr 0.2 Al 0.2 Fe 0.8 O 3±δ -LSAF) perovskites are drawing attention as cathodes in solid oxide fuel cells (SOFCs). The structural properties of these materials are mostly counting on the methods of preparation. In this study, two different preparation methods namely hydrothermal and sol-gel were applied to prepare LSAF perovskite. The characterization results including scanning electron microscopy (SEM), N 2 adsorption-desorption, and Fourier transform infrared spectroscopy (FT-IR) are investigated in detail. The results showed that the preparation method played an important role on the microstructure of the LSAFs. It can be highlighted that the hydrothermal method is more successful in obtaining quite small nanoparticles.

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Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Sentez Yöntemi ile LSAF Perovskit Morfolojisinin Ayarlanması

Şahin

2021

Bilecik Şeyh Edebali Üniversitesi Fen Bilimleri Dergisi

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“…Lanthanum nickelates are one such examples from the category of perovskite oxides, which has exceptional properties in terms of thermal stability, oxygen ion mobility, and varying defects, etc [11]. Previously, either lanthanum nickelates or their layered derivatives have been synthesized by techniques such as sol-gel, hydrothermal, solid-state or even molten salts mediated liquid phase synthesis [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Controlling phase transformation of La/Ni oxides by switching annealing conditions and their resultant pseudocapacitive behaviour

Gopi,

Reddi,

Karthik

et al. 2023

Nanotechnology

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Annealing step is a critical step in the hydrothermal assisted synthesis of La/Ni oxides such as LaNiO3−δ (LNOA) and La2NiO4+δ (LNON). In the current study, we have discovered the interlink between the atmosphere and temperature conditions which dictate the product formed. La/Ni nitrate precursors were subjected to a hydrothermal synthesis followed by an annealing step at appropriate temperature and varying atmosphere resulting in the synthesis of the corresponding oxides. The annealing temperature was varied in the range between 650 °C and 800 °C and also the annealing was carried out either in pure N2 atmosphere or air. From the x-ray diffraction analysis, it was inferred that annealing in air invariably resulted in the rhombohedral LaNiO3 (LNOA) perovskite phase, while annealing in N2 atmosphere resulted in an orthorhombic Ruddlesden–Popper phase La2NiO4 (LNON), a layered oxide containing traces of NiO phase. Typically, iodometric titrations substantiate the presence of Ni (III) which further can be correlated to the presence of oxygen vacancies (δ). Iodometric test results demarcated the difference between the two phases with absolutely minimal I2 liberated from the LNON samples proving that negligible amount of Ni (III) was present in LNON Scanning electron microscopy (SEM) images showed an agglomeration of particles annealed at higher temperatures irrespective of the atmosphere. Temperature dependent oxygen non-stoichiometry (Δδ) was analyzed through thermogravimetric analysis, wherein Δδ was inversely proportional to the annealing temperature for all of the LNOA samples. Considering that large δ values favor pseudocapacitive behaviour, it was observed LNOA oxides showed excellent pseudocapacitive behaviour compared to the LNON oxides. Dunn deconvolution of the cyclic voltammograms of LNOA 800 °C at 5 m Vs−1 indicated that diffusive contribution (66%) was predominant over capacitive contributions. The LNOA sample annealed at 800 °C displayed the highest specific capacitance of 100.3 F g−1 at 1 A g−1 current density.

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