Synthetic study of nanocrystalline complex oxides LaFe1–yCoyO3

Li, Xi; Zhang, Hengbin; Li, Shujia; Chen, Feng; Xu, Baokuen; Zhao, Muyu

doi:10.1039/jm9930300547

Cited by 109 publications

(147 citation statements)

References 9 publications

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“…Li et al. [ 188 ] used 33 wt% hydrochloric acid (aqueous HCl) as an additive to fabricate moisture tolerant PSCs in ambient conditions with a RH of up to 60%. The one‐step and two‐step spin‐coating methods were used, and both achieved a PCE exceeding 14%.…”

Section: Approaches For Ambient Fabricationmentioning

confidence: 99%

Ambient Fabrication of Organic–Inorganic Hybrid Perovskite Solar Cells

et al. 2020

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Unlike fossil fuels, the sun is an inexhaustible energy source that delivers more energy to the earth in 1 h than the entire planet consumes in one year. Energy can be harvested from the sun using photovoltaics (PV) and stored (e.g., batteries), meaning solar energy can be used as and when required. [3,4] Currently, the commercial PV market is dominated by single-junction crystalline silicon (c-Si) PV which deliver power conversion efficiencies (PCE) of over 26% under 1 Sun illumination (AM 1.5 standard). [5,6] Despite their high efficiencies, the fabrication of c-Si PV is nontrivial and lacks electronic tunability. Furthermore, the record efficiency for c-Si PV is 26.7% [5] which is very close to the theoretical limit of 29.4%. [7] This clearly indicates that c-Si PV is a mature technology and there is limited room for improvement. [8] Over the past two decades, third-generation solar cells such as dye-sensitized solar cells, [9,10] quantum dot solar cells, [11,12] organic solar cells, [13,14] and perovskite solar cells (PSCs) [15,16] have been developed as alternatives to c-Si technologies. Of these third-generation solar cells, single-junction PSCs have generated significant attention due to their intense visible to near-infrared absorptivity, [16-18] long diffusion lengths of the charge carriers, [19,20] high efficiency, [21,22] electronic and physical tunability, [23,24] and low manufacturing costs. [25,26] After the first report by Miyasaka's group in 2009, [27] the PCE for single junction devices increased considerably from 3.8% to 25.2%, [27,28] making it the fastest advancing PV technology to date. This has uniquely placed PSCs as the frontrunner technology to potentially replace or coexist with c-Si PV. The term "perovskite" refers to a group of compounds that share the same lattice structure as calcium titanium oxide (CaTiO 3). All PV perovskite materials have the general chemical formula ABX 3 , as illustrated in Figure 1a. Organic-Inorganic hybrid PSCs are typically made using an organic/ inorganic cation (A = methylammonium (MA) CH 3 NH 3 + , formamidinium (FA) CH 3 (NH 2) 2 + , or cesium), a divalent cation (B = Pb 2+ or Sn 2+) , [29] and an anion (X = Cl − , Br − , or I −), illustrated in Figure 1b. [16,30] A is surrounded by eight lead halide octahedra (B in the center of octahedra) and forms a cubic perovskite structure. When the size of A or/and X is changed, the structure of perovskite will distort. The Goldschmidt tolerance factor (t) [31] of perovskite is an empirical index for Organic-inorganic hybrid perovskite solar cells (PSCs) have attracted significant attention in recent years due to their high-power conversion efficiency, simple fabrication, and low material cost. However, due to their high sensitivity to moisture and oxygen, high efficiency PSCs are mainly constructed in an inert environment. This has led to significant concerns associated with the long-term stability and manufacturing costs, which are some of the major limitations for the commercialization of this cutting-edge tech...

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Section: Approaches For Ambient Fabricationmentioning

confidence: 99%

Ambient Fabrication of Organic–Inorganic Hybrid Perovskite Solar Cells

et al. 2020

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“…The mixture was ground for 30 min, and the byproduct salt was dissolved with distilled water in an ultrasonic bath. The dissolved-salt mixture was centrifuged for 10 min (8000 rotations per minute) and then air-dried at 85°C for 24 h. The resulting composite hydroxide nanoparticles (LaCo(OH) 5 , designated LCN-RM) were calcined at 600°C in air for 2 h; perovskite-type composite oxide LaCoO 3 nanocrystals (2.26 g, designated LCN-600) were obtained, with yield of 92%. Three parts of the LCN-RM (ϳ0.25 g) were removed and further calcined in air for 2 h at 200°, 400°, and 800°C, respectively, to give nanoparticles of different sizes (designated LCN-200, LCN-400, and LCN-800, respectively).…”

Section: Methodsmentioning

confidence: 99%

“…Under our method, the perovskite-type LaCoO 3 composite oxide appeared in the same temperature range as in the sol-gel process. 5 These results may also be attributable to the efficient mixing of the reactants. Because HNO 3 (35%) is added to inhibit hydrolysis of the La 3ϩ and Co 2ϩ ions, an LC can be produced before the solid-state reaction of the ions with MOH (M ϭ K, Na).…”

Section: (3) Formation Of Nanoparticlesmentioning

confidence: 99%

“…Thus, the development of alternate methods to produce nanometer-sized LaCoO 3 oxides is of intense interest in the chemistry and material fields, because of the unique physical and chemical properties of these oxides, as well as their suitability for various applications. 4 Currently, the most common approaches to fabricating composite oxide nanocrystals are the sol-gel process, 5,6 flame hydrolysis of an aqueous solution, 7 and solid-state thermal decomposition of precursors. 8,9 The reactants must be mixed at the molecular level, and thus, the diffusion barrier of La 3ϩ and Co 3ϩ ions is eliminated during calcination.…”

Section: Introductionmentioning

confidence: 99%

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Solid‐State Synthesis of LaCoO₃ Perovskite Nanocrystals.

Chen

et al. 2002

ChemInform

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Solid-State Synthesis of LaCoO 3 Perovskite Nanocrystals.Perovskite-type nanocrystals of the title compound with grain diameters of 15-40 nm are synthesized by solid state reaction of La(NO 3 ) 3 ·nH 2 O and Co(NO 3 ) 2 ·6H 2 O with KOH at ambient temperature, followed by calcination at 600 • C in air for 2 h (92% yield). The samples are characterized by XRD and TEM. The new process is convenient, inexpensive, and effective for obtaining LaCoO 3 nanocrystals in high yield.

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“…The Lao.7Sr0.3Fe03-8 precursor was prepared by the PEG method [9]. The sample A1 was obtained after sintering the precursor at 500 "C in air for 1 h. After annealing A1 in the furnace in air at 1150 and 1250°C for 1 and 4 h, the samples A2 and A3 were obtained, respectively.…”

Section: Methodsmentioning

confidence: 99%

The study of ⁵⁷Fe Mössbauer spectra for La_0.7Sr_0.3FeO_3−δ with different structure

Zhao

1996

Physica Status Solidi (b)

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Samples of Lw.7Sro.3Fe03 -6 were obtained by sintering the precursor prepared by the Polyethylene Glycol (PEG) method. The measurements of XRD and 57Fe Mossbauer spectra showed that the heat treatment of the precursor at different temperatures leads to phase transformations from the orthorhombic to the cubic and finally to the rhombohedral phase, to an increase of average grain size, and to changes of the electronic states of the Fe ions. It, was thought that in the perovskite oxides the conditions of synthesis or treatment may have an important influence on structure and properties by adjusting the valence state or/and introducing oxygen vacancies.

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Synthetic study of nanocrystalline complex oxides LaFe_1–yCo_yO₃

Abstract: A precursor to LaFe, -, Co, O, has been prepared using the polyethylene glycol-gel method. After calcination of the precursor at 450-550 "C for 1-2 h, nanocrystalline complex oxides LaFe,-,Co,O, (y=O.5, 0.6, 0.8) with the perovskite structure and grain diameter Show more

Cited by 109 publications

References 9 publications

Ambient Fabrication of Organic–Inorganic Hybrid Perovskite Solar Cells

Ambient Fabrication of Organic–Inorganic Hybrid Perovskite Solar Cells

Solid‐State Synthesis of LaCoO₃ Perovskite Nanocrystals.

The study of ⁵⁷Fe Mössbauer spectra for La_0.7Sr_0.3FeO_3−δ with different structure

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Synthetic study of nanocrystalline complex oxides LaFe1–yCoyO3

Abstract: A precursor to LaFe, -, Co, O, has been prepared using the polyethylene glycol-gel method. After calcination of the precursor at 450-550 "C for 1-2 h, nanocrystalline complex oxides LaFe,-,Co,O, (y=O.5, 0.6, 0.8) with the perovskite structure and grain diameter Show more

Cited by 109 publications

References 9 publications

Ambient Fabrication of Organic–Inorganic Hybrid Perovskite Solar Cells

Ambient Fabrication of Organic–Inorganic Hybrid Perovskite Solar Cells

Solid‐State Synthesis of LaCoO3 Perovskite Nanocrystals.

The study of 57Fe Mössbauer spectra for La0.7Sr0.3FeO3−δ with different structure

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Product

Resources

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Synthetic study of nanocrystalline complex oxides LaFe_1–yCo_yO₃

Solid‐State Synthesis of LaCoO₃ Perovskite Nanocrystals.

The study of ⁵⁷Fe Mössbauer spectra for La_0.7Sr_0.3FeO_3−δ with different structure