12 results about "Double perovskites" patented technology

The application discloses a perovskite cathode catalytic material for hydrogen production by solid oxide ammonia electrolysis and preparation and application thereof. 1.5‑x Co x Mo 0.5 O6 (0≤x≤0.3). The cathode prepared by the material can operate under medium-high temperature working conditions, and hydrogen reduction occurs in the ammonia electrolysis process, cobalt-iron alloy is generated and anchored in the layer perovskite Sr3Fe 2‑x‑ y Co x Mo y O7 (0≤x≤0.3, 0≤y≤0.3) surface, which makes the cathode interface have more content of low-valence state ions, can provide acceptor electrons for water dissociation, enhances the adsorption and desorption capacity of the cathode interface to water vapor, and the surface alloy also provides more active sites for water dissociation, and thus can be used for hydrogen production by solid oxide ammonia electrolysis.

This invention belongs to the field of reversible proton ceramic battery technology, and relates to an oxygen electrode material for a three-phase heterointerface reversible proton ceramic battery. The three-phase heterointerface reversible proton ceramic battery oxygen electrode material is a three-phase composite containing A-site defects in double perovskite Pr. 1‑α BaCo2O 5+δ1 (PBC) phase, single perovskite BaPrO 3‑δ2 The invention comprises a (BPO) phase and in-situ desoluble praseodymium oxide nanoparticles; with the total mass percentage of PBC phase, BPO phase, and praseodymium oxide nanoparticles being 100%, the PBC phase accounts for 50-65 wt%, the BPO phase accounts for 33-45 wt%, and the praseodymium oxide nanoparticles account for 1-5 wt%. The three-phase heterogeneous interface oxygen electrode material constructed in situ in this invention exhibits tight coupling and synergistic effects among the three phases, resulting in both a low coefficient of thermal expansion and high catalytic activity. This oxygen electrode material demonstrates excellent electrochemical performance in reversible proton ceramic batteries, whether in fuel cell mode or electrolyzer mode.

This invention relates to a method for preparing double perovskite La2CoFeO6 and its application in degrading odorous pollutants, comprising the following steps: dissolving La(NO3)3·6H2O, Co(NO3)2·6H2O, and Fe(NO3)3·9H2O in a mixed solution of deionized water and ethylene glycol or deionized water and citric acid, adjusting the pH, and then mixing thoroughly; placing them separately in a high-pressure reactor and heating or evaporating the moisture and drying in an oven to obtain precursor powder or dry gel; then calcining at high temperature and cooling to obtain double perovskite La2CoFeO6 powder. The R3c phase La2CoFeO6 material provided in this application, by combining crystal structure regulation with oxygen vacancy defect engineering, establishes a synergistic enhancement mechanism of "structure optimization + defect regulation" for double perovskite materials, significantly improving the photoresponse capability and catalytic performance of the material, providing a new technical path and material design idea for the design of subsequent high-performance photocatalysts for odor pollution control.

This invention discloses a multi-step high-entropy high-enthalpy phase transition hybrid double perovskite material and its preparation method. The preparation method includes the following steps: 1) Weigh at least one of 1,3-propanediamine, N-methyl-1,3-propanediamine, 1,3-diamino-2-propanol, ethylenediamine, N-ethylethylenediamine, and N-(2-hydroxyethyl)ethylenediamine, as well as a salt containing M1, a salt containing M2, and formic acid as raw materials according to stoichiometric ratio; 2) Add the above raw materials to a reaction vessel lined with polytetrafluoroethylene and mix evenly; 3) Seal the reaction vessel and heat it at a constant temperature of 80-110℃ for 36-72h; 4) Cool naturally to room temperature, collect the product, wash and dry it to obtain a material with the chemical formula [A]2[M1M2(HCOO)6]. This material achieves multi-step reversible high-entropy and high-enthalpy phase transitions through heterovalent bimetallic synergy and flexible cyclic ammonium cation design. It also features dielectric response and low-temperature photoluminescence. The phase transition temperature can be tuned to room temperature and near room temperature range, effectively solving the problems of limited phase transition steps, low entropy and enthalpy changes, and poor performance synergy of existing materials.

The application provides a double perovskite luminescent material which can be used for LED lighting and information encryption, and has a chemical formula of [Rb 1‑x (NH4) x ]2SnCl6:yBi 3+ , wherein 0

The application belongs to the technical field of solid oxide fuel cell cathode materials, and discloses a kind of A site defect regulated high-entropy cobalt-based double perovskite solid oxide cathode material and its preparation method and application.The cathode material is composed of the A site defect derivative of the basic high-entropy cobalt-based double perovskite;The A site defect derivative is (Gd 1 / 6 Pr 1 / 6 La 1 / 6 Ba 1 / 6 Sr 1 / 6 Ca 1 / 6 ) 0.93 CoO3.The application solves the contradiction between activity, stability and process adaptability of existing cathode materials through the synergistic strategy of "high-entropy structure design + A site defect engineering", and can be applied to related electrocatalysis fields such as electrocatalytic oxygen evolution and carbon dioxide reduction.

This invention discloses a wearable plant humidity sensor and its preparation method, belonging to the field of plant moisture detection technology. The preparation method includes: fabricating Ag interdigitated electrodes on a flexible PET substrate; reacting MA2SnCl6 precursor solution by dissolving MACl and SnCl4·5H2O in a solvent, and optionally optimizing the solution with isopropanol or ammonia; spin-coating the precursor solution onto the electrodes and annealing to form an MA2SnCl6 thin film. This invention is the first to apply lead-free double perovskite MA2SnCl6 to plant humidity sensing. The resulting sensor is flexible, wearable, and deformation-resistant, allowing it to fit closely to plant leaves, enabling real-time, in-situ, and non-destructive detection of surface moisture in living plants (such as pumpkin seedlings). It also boasts advantages such as high sensitivity, good repeatability, and strong stability, solving the problems of interference susceptibility and poor applicability of traditional detection methods.

This invention relates to an in-situ modified Fe nanoparticle-supported oxygen ion conductor fuel electrode, its preparation method, and its applications, belonging to the field of fuel cell technology. This invention proposes a dual perovskite oxide Sr2Fe... 1.5 Mo 0.5 O 6‑δ The B-site Zn substitution strategy revealed that Zn doping can significantly enhance the Fe-O bond energy in the material and reduce the Sr2Fe bond energy. 1.5 Mo 0.5 O 6‑δ The precipitation energy of Fe element is reduced, thereby inhibiting the precipitation of Fe nanoparticles under high-temperature reducing atmosphere, achieving the purpose of in-situ modification of Fe nanoparticles. Tests on three fuel electrode materials with different doping amounts revealed that the Zn-doped material exhibited superior CO2 electrolysis performance. The optimized nanoparticles not only provided more reaction sites but also enhanced the material's chemisorption capacity for CO2, which is beneficial to the carbon dioxide reduction reaction process.

This invention discloses an iron-nickel alloy-modified double perovskite material for solid oxide electrolytic cells and its preparation method, belonging to the fields of energy materials and electrochemistry. The composite material comprises a defect-type double perovskite matrix obtained by controlled reduction of Sr₂Fe₁.₃₅Mo₀.₄₅Ni₀.₂O₆-δ, and FeNi₃ alloy nanoparticles precipitated in situ and uniformly distributed on the matrix surface. This invention innovatively employs a carbon-mediated short-duration high-temperature shock reduction strategy, using carbon powder as an instantaneous reducing agent. Through multiple rounds of extremely short-duration high-temperature shocks, in-situ desolvation of the FeNi₃ alloy nanoparticles is achieved, solving the problems of high energy consumption, long processing time, and easy particle coarsening in traditional reduction processes. The composite material prepared by this invention possesses high catalytic activity, high ionic / electronic conductivity, and excellent structural stability. When used as a cathode material in a solid oxide electrolytic cell, it exhibits significantly improved CO₂-H₂O co-electrolysis performance, possessing extremely high industrial application value.

The present application relates to the technical field of luminescent material, in particular to hafnium-based double perovskite nanocrystals with uniform size and a preparation method thereof, aiming to solve the technical problems of uneven size distribution, low quality and low quantum yield of existing Cs2HfCl6 nanocrystals caused by one-pot preparation. The present application proposes a hot injection preparation method, including: S1, obtaining a solution L1 of cesium precursor CsX; S2, obtaining a solution L2 of hafnium precursor Hf(acac)4; S3, combining the preheated L1 and L2 solutions with a preheated mixed solvent under an inert atmosphere, then injecting a solution containing chlorine to initiate the reaction, and obtaining the target nanocrystals after ice water bath cooling. The present application effectively controls the crystallization speed of perovskite nanocrystals, so that the product composition is uniform, the size is uniform, the quantum efficiency and stability are significantly improved, and it is helpful for application in the fields of luminescent devices, radiation detection and the like.

This invention discloses a lamp with a self-cleaning photoresponsive functional coating and its preparation method in the field of functional coatings and lighting equipment. The core of this invention lies in the preparation of two novel functional materials: europium-dysprosium co-doped double perovskite-type bismuth oxytellurate barium nanocrystals, and tungstic acid-functionalized titanium dioxide and molybdenum disulfide heterojunction. Subsequently, these two materials are mixed with fillers such as blue long afterglow powder, nano-graphite phase carbon nitride, and nano-titanium dioxide, as well as additives such as fluorosilicone modified resin, to obtain a self-cleaning photoresponsive coating. Finally, the coating is applied to the surface of the lamp through processes such as cleaning, spraying, leveling, and segmented baking. The lamp coating obtained by this invention integrates long afterglow luminescence characteristics and efficient photocatalytic ability, which can continuously decompose surface pollutants in both light and dark environments, and has superhydrophobic properties. It realizes multiple functions such as all-weather self-cleaning, air purification, and decorative lighting, significantly improving the practicality and durability of the lamp.

This invention relates to the field of lead-free perovskite optoelectronic materials technology, and discloses a method for preparing lead-free antimony-bismuth double perovskite thin films, comprising the following steps: (1) CsBr, AgBr, and BiBr3 are mixed in stoichiometric ratio and dissolved in a mixed solvent composed of DMF and DMSO to obtain a precursor solution; (2) substrate pretreatment; (3) pulse spraying of the precursor solution using a multi-zone temperature-controlled nozzle, and film formation is achieved through gradient crystallization; (4) in-situ laser thickness measurement is performed simultaneously during the spraying process, and the film thickness is monitored in real time and controlled in a closed loop; (5) high-temperature annealing is performed after spraying to obtain a lead-free antimony-bismuth double perovskite thin film. This invention optimizes the microstructure of the thin film and improves its optoelectronic performance through a gradient crystallization control strategy. By using a multi-zone temperature-controlled nozzle and pulse spraying technology, the process stability and product uniformity are improved, and raw material waste is reduced. In-situ laser thickness measurement is used to synchronize deposition and detection, shortening the debugging cycle and improving product yield.