26results about "Bismuth compounds" patented technology

This invention discloses a composite modified lithium manganese oxide cathode material, its preparation method, and its applications, belonging to the field of cathode material technology. The structural formula of the composite modified lithium manganese oxide cathode material is: LiX a O b @LiYO2 / LiMn2O4, comprising: a core composed of LiYO2 and LiMn2O4, and LiX coating at least a portion of the surface of the core. a O b The coating layer; wherein: LiMn2O4 has a porous structure, and LiYO2 fills the channels of LiMn2O4. The cathode material in this invention uses lithium manganese oxide as a matrix, with LiYO2 filling the channels of the matrix, and LiX coated on the surface of the matrix. a O b Filling the pores with LiYO2 can reduce the Jahn-Teller effect of lithium manganese oxide without affecting the specific capacity of the cathode material. Moreover, LiYO2 can accelerate the lithium-ion diffusion rate, thereby improving the rate performance of the material.

The application discloses a preparation method and application of high-stability lead-free halide core-shell nanocrystals and belongs to the field of semiconductor material preparation. The nanocrystal core layer is and the shell layer is an in-situ grown anatase phase / amorphous phase. Tetrabutyl titanate is used as a single titanium source, and one-step coating is carried out through precursor solution preparation-titanium source in-situ hydrolysis-anti-solvent induction-post treatment. Optionally, a chelating agent can be introduced to passivate defects, and a polymer+inorganic dense layer double-coating can be used to strengthen the stability. The oxygen-free preparation conditions are optimized, and one or mixed halogen nanocrystals can be prepared by passing nitrogen gas throughout the whole process, so that the problems of poor water oxygen and thermal stability of traditional nanocrystals are solved. In-situ coating forms an interface bonding, and the fluorescence retention rate is greater than or equal to 80% in air for three months, and the Cl / Br phase can reach greater than or equal to 90%. The process is simple and easy to scale, and the material can be widely applied to the fields of photocatalysis, flexible X-ray imaging, LED, photoelectric detection and the like, and has significant academic and industrial application values.

The application relates to a method for preparing high-concentration formic acid by cyclic electrolysis based on tin-doped bismuth nanosheets, which comprises the following steps: S1, blending bismuth nitrate pentahydrate, stannous chloride dihydrate, urea, cetyltrimethylammonium bromide and a solvent, and heating to obtain tin-doped bismuth nanosheets; S2, loading the tin-doped bismuth nanosheets on a gas diffusion layer to obtain a cathode; S3, constructing a solid-state electrolyte layer; S4, constructing an electrolytic cell by arranging the cathode, the solid-state electrolyte layer and an anode to obtain an electrolysis system; S5, introducing carbon oxide gas into the cathode of the electrolysis system, introducing an initial liquid into the solid-state electrolyte layer, applying a voltage for electrolysis, collecting the product and introducing the product into the solid-state electrolyte layer again for circulation to obtain the high-concentration formic acid. The application realizes direct preparation of high-concentration and high-purity formic acid solution under the condition of no liquid electrolyte by using tin-doped bismuth nanosheets as a catalyst, combining a solid-state electrolyte electrolytic cell and a cyclic electrolysis enrichment process.

The application provides a red light excitable photoelectric response heterostructure nanotube, a hydrogel and a preparation method and application thereof, and belongs to the technical field of nanomaterials. By integrating a heterostructure, a quantum confinement effect and morphological modification, a one-dimensional TiO2 / Bi2S3 quantum dot nanotube with visible red light excitation and high photoelectric conversion efficiency is prepared, which is combined with a hydrogel precursor to simulate an extracellular matrix, so that a high-performance red light response photoelectric hydrogel dressing is developed. The hydrogel dressing has excellent ability in promoting nerve ending reinnervation, promoting skin substructure repair and regulating immune response in a deep burn model, and has wide application prospects in overall skin repair.

The application relates to the technical field of electrocatalytic carbon dioxide reduction, in particular to a preparation method of PbBiO2OH and application of the PbBiO2OH in electrocatalytic carbon dioxide synthesis of formic acid. The PbBiO2OH is prepared by adopting a method of "directly mixing Bi salt and Pb salt + one-step hydrothermal method", without needing complex pretreatment or post-treatment, and the reaction equipment is simple, and the reaction condition is mild. The PbBiO2OH prepared by the application is regulated through double-metal cooperation and OH intercalation, not only expands the high-selectivity potential range to a wide potential range of 0.85V~‑1.55V (vs. RHE), but also realizes 220-hour high-current density stable operation, and solves the core contradiction that the selectivity and stability of a single-metal Bi-based catalyst cannot be compatible.

The application discloses a kind of high stability two-dimensional perovskite nanosheet perovskite and its preparation method and application, belong to perovskite material technical field.The application is with ethanol as core solution system, replace traditional corrosive hydrogen halide acid system, prepare nanosheet by improved solution recrystallization and ultrasonic stripping technology, and realize structure accurate optimization by regulating halogen configuration, matrix ratio and crystallization temperature, clear the regulation mechanism of octahedral unit to electronic structure.Nanosheet thickness is 5-50 nm, degree of crystallinity is high, and photoluminescence intensity retention rate is ≥80% in air storage 3 months.The material band gap can be adjusted (2.0-3.2 eV), and the selectivity of target product is ≥85% when used for photoreduction, the activity retention rate is ≥75% for 24 hours continuous reaction, and can be widely applied in photocatalysis, photoelectric detection and optoelectronic device field, and has significant industrial application value.

This invention discloses an Ag-Bi 24 Br 10 O 31 This paper discusses the preparation and application of Bi₂O₂S heterojunction composite materials, belonging to the field of SERS detection technology. First, Bi₂O₂S heterojunction composite materials are prepared using a hydrothermal method. 24 Br 10 O 31 Nanosheets, then with Bi 24 Br 10 O 31 Bi2O2S was constructed by secondary hydrothermal in-situ growth of Bi2O2S on nanosheets as a substrate. 24 Br 10 O 31 A Bi₂O₂S heterostructure was formed, followed by chemical reduction to load Ag nanoparticles, and then dried to obtain the target composite SERS substrate. This material utilizes the localized surface plasmon effect of Ag to form a strong SERS "hot spot," exhibiting excellent Raman enhancement performance for crystal violet, enabling highly sensitive detection of crystal violet. This method is simple, uses readily available raw materials, and produces a material that combines excellent SERS enhancement performance with photocatalytic activity, showing broad application prospects in environmental monitoring and pollution control.

The application relates to a preparation method and application of a bismuth trisulfide nanowire / molybdenum disulfide nanosheet composite nanomaterial. The application aims to solve the problems of low sensitivity and long recovery time of an existing Bi2S3 material in NO2 detection at room temperature. The application adopts a simple hydrothermal synthesis method to prepare a Bi2S3 / MoS2 composite nanomaterial by taking sodium molybdate, bismuth nitrate pentahydrate and thiourea as main raw materials. In the prepared Bi2S3 / MoS2 composite nanomaterial, Bi2S3 is in a nanowire structure, MoS2 is in a nanosheet structure, and the two structures are in close contact to form a composite material. The NO2 gas sensor prepared based on the composite nanomaterial has the characteristics of high sensitivity, fast response and room temperature operation, and the application can be applied to the field of gas sensors.

This invention provides a one-pot hydrothermal preparation method for bismuth oxychloride-tin dioxide nanocomposites: Sodium bismuthate and stannous chloride are dispersed in deionized water to obtain a solid-liquid mixture; the solid-liquid mixture is placed under hydrothermal conditions for a hydrothermal reaction. In the same hydrothermal system, sodium bismuthate and stannous chloride undergo a redox reaction to generate BiOCl, simultaneously producing tetravalent tin ions and hydroxide ions; the tetravalent tin ions and hydroxide ions undergo in-situ precipitation and are loaded onto the BiOCl surface, which is then converted into SnO2 crystals via hydrothermal crystallization, ultimately yielding the BiOCl-SnO2 nanocomposites in one step. This invention, based on the synergistic effect of redox reaction, precipitation reaction, and hydrothermal crystallization reaction, synthesizes BiOCl-SnO2 nanocomposites in a single reaction system in one step, without the need for the addition of alkali and template agents. The process is simple, compatible with various conditions, produces high-purity products, and is environmentally friendly, making it suitable for industrial production.

The present disclosure relates to a solid-state battery that includes: an exterior portion and an insulating portion, in which at least one of the exterior portion and the insulating portion includes an oxide ceramic containing Li, Mg, one or more elements (M) selected from the group consisting of Group 4 and Group 5 elements, and Bi.

This invention provides a method for preparing bismuth titanate nanoparticles using molten salt assistance. Sodium bismuthate dihydrate, sodium sulfite, titanium sulfate, and sodium nitrate are mixed and ground uniformly to obtain a solid mixture. The solid mixture is then heated at 350°C to melt the sodium nitrate, creating an ion-molten liquid environment. Under this environment, a redox reaction between sodium bismuthate dihydrate and sodium sulfite generates the transition product bismuth oxysulfate, producing sodium hydroxide and creating a self-generated alkaline condition. Simultaneously, under this self-generated alkaline condition, bismuth oxysulfate reacts with titanium sulfate to form bismuth titanate. The reaction product is then post-processed to obtain Bi... 24 Ti2O 40 Nanoparticles. The advantages of this invention are: a synthesis strategy based on an ion-molten liquid environment, accelerated reactant diffusion, and improved chemical reaction efficiency to prepare Bi. 24 Ti2O 40 Nanopowders are easy to prepare, convenient to operate, have a mild reaction, and are low in cost, making them suitable for industrial production.

The application discloses a preparation method of high-entropy nano artificial pinning center HETiO3 for flux pinning enhancement of superconducting materials, and comprises the following steps: firstly, citric acid is dissolved in deionized water and the pH value is adjusted to obtain a citric acid solution; secondly, a mixed solution of tetrabutyl titanate and acetylacetone is added dropwise into the citric acid solution, and after stirring until the solution is layered, the clear solution A is separated and extracted; thirdly, the clear solution A is added into HE components, and stirring is conducted to obtain the clear solution B; fourthly, ethylene glycol is added into the clear solution B and stirring is conducted until a sol is formed; fifthly, the sol is sequentially subjected to low-temperature calcination and medium-temperature calcination to obtain a powder; and sixthly, the powder is subjected to high-temperature calcination, and HETiO3 is obtained after cooling. According to the preparation method, high-entropy components are introduced, lattice distortion and slow diffusion effect of high-entropy materials are utilized, excellent thermal stability and stronger potential pinning capacity are endowed to the pinning center, and atomic-level uniform mixing of metal ions is realized, and the method is suitable for the field of superconducting materials.

Formula (I): L n D m (B x B’ 1-x ) r (Z t Z’ 1-t ) q M p A y A’ s (I) wherein n, m, x, r, t, q, p, y, s, L, D, B, B’, Z, Z’, M, A, and A’ are as defined herein. These compounds can exhibit superconductivity at high temperatures.

The invention discloses a method for realizing anisotropic carrier transport of a lead-free perovskite Cs2AgBiBr6 single crystal. The method comprises the following steps: applying a certain pressure to the lead-free perovskite Cs2AgBiBr6 single crystal, pressurizing for two rounds, maintaining for a certain time under a certain pressure, and then releasing the pressure to normal pressure to measure the anisotropic carrier transport condition of the lead-free perovskite Cs2AgBiBr6 single crystal after pressure treatment. And the diffusion coefficient test of the lead-free perovskite Cs2AgBiBr6 single crystal under different pressures is realized. As the pressure is increased, the diffusion coefficient of the Cs2AgBiBr6 single crystal is firstly increased and then an inflection point appears at 2.0 GPa. And the anisotropic carrier transportation of the lead-free perovskite Cs2AgBiBr6 single crystal is successfully realized. The invention provides a brand new method for realizing anisotropic carrier transportation of the lead-free perovskite Cs2AgBiBr6 single crystal.

This disclosure relates to compounds of formula (I): LnDm(BxB'1-x)r(ZtZ'1-t)qMpAyA's (I), in which n, m, x, r, t, q, p, y, s, L, D, B, B', Z, Z', M, A, and A' are defined in the specification. These compounds can exhibit superconductivity at a high temperature.

This invention discloses an ultra-low thermal conductivity all-inorganic perovskite cesium bismuth iodide aerogel, its preparation method, and its applications, relating to the field of aerogel technology. The method involves dissolving cesium iodide and bismuth triiodide in a mixed solvent of oleic acid, oleylamine, and octadecene to obtain a cesium bismuth iodide mixed solution; maintaining the cesium bismuth iodide mixed solution at 120-260℃ for 1-48 hours, followed by sequential filtration and purification to obtain a cesium bismuth iodide colloid; aging the cesium bismuth iodide colloid and then drying it to form an ultra-low thermal conductivity all-inorganic perovskite cesium bismuth iodide aerogel. This invention improves the application performance of aerogels in medium- and low-temperature insulation fields by utilizing the ultra-low intrinsic thermal conductivity of the all-inorganic perovskite cesium bismuth iodide, along with its low-temperature thermal stability.

This invention relates to a green and efficient Bi 13 S 18 The preparation method and application of Br2 belong to the field of piezoelectric catalysis technology. The method involves adding a bismuth salt solution to a mixed solution of a sulfur source and a bromine source, stirring at 80℃~130℃ for 4 h~7 h to carry out a co-precipitation reaction, and filtering, washing, drying, and grinding the resulting black precipitate to obtain Bi2. 13 S 18 Br2; the application is as an antibacterial functional material in marine antifouling coatings. The method is green and efficient, and is simple, low-cost, uses readily available raw materials, and is easy to produce. The application is based on the principle of piezoelectric effect, Bi... 13 S 18 Br2 possesses an intrinsic asymmetry that results in an internal dipole moment, which can effectively utilize external mechanical energy such as ocean wave energy to generate an internal piezoelectric potential. This leads to a piezoelectric catalytic reaction that produces reactive oxygen species. These reactive oxygen species kill marine bacteria and other fouling microorganisms, ultimately achieving the goal of marine antifouling.

Preparation method of layered Bi4T i3 O 12 i3O12 with adjustable crystal face orientation and polarization, belongs to the field of photocatalytic materials.The application adopts the strategy of adding reducing agent glyoxal in hydrothermal synthesis.Bi4Ti3O 12 Usually tends to grow along the (001) surface, forming rectangular nanosheets.In the glyoxal-assisted hydrothermal system, due to the selective adsorption of glyoxal molecules on specific crystal faces, the surface energy of the crystal faces is changed, the original perovskite-like layer (Bi2Ti3O 12 ) 10 ) 2‑ Is destroyed, the crystal lattice is distorted, and the polarization effect of Bi4Ti3O 12 Is further enhanced.The method innovatively changes the growth direction of Bi4Ti3O 12 Material, overcomes the problems of weak traditional polarization intensity and low polarization electric field efficiency, and has important significance for exploring new strategies for designing high-performance polar catalytic materials and promoting energy and environmental development.

This invention provides a method for preparing bismuth cuprate nanopowder with molten salt assistance. Sodium bismuthate dihydrate, sodium sulfite, copper sulfate, and sodium nitrate are mixed and ground uniformly to obtain a solid mixture. The solid mixture is heated to melt the sodium nitrate, forming an ion-molten liquid environment, and the reaction takes place in this environment. During the reaction, sodium bismuthate dihydrate and sodium sulfite undergo a redox reaction to generate the transition product bismuth oxysulfate, producing hydroxide ions and forming a self-generated alkaline environment. Simultaneously, in this self-generated alkaline environment, bismuth oxysulfate and copper sulfate react to generate bismuth cuprate. The reaction product is then post-treated to obtain Bi₂CuO₄ nanopowder. The advantages of this invention are: based on the synthesis strategy of using an ion-molten liquid environment, accelerating reactant diffusion, and improving redox reaction efficiency, it can efficiently prepare bismuth cuprate nanopowder, and the preparation steps are simple, convenient, and low-cost.

A method for forming an insoluble adduct using an acidic medium is provided. A chemical process utilizes acidic media to change the solubility behavior of metal solutes. The method can utilize Group 1 soluble alkali metals but can also be extended to any other soluble salts discussed under the solubility rules. The insoluble salts can be Group 2 alkaline earth metals or other insoluble salts. The insoluble adduct can have the designation XYZ where X is a soluble metal from a metal hydroxide or a metal oxide, Y is an insoluble metal from an insoluble metal hydroxide or an insoluble metal oxide, and Z is the acid ion from an aqueous acidic media.

The application relates to a ZnO / Bi2S3 photosensitization synergistic photothermal sensitization NO2 gas sensing material and a preparation method thereof, and belongs to the technical fields of nanomaterial preparation, atmospheric environment detection and gas sensors, and has a good application prospect. The characteristic is that porous ZnO precursors are prepared first, and then are combined with Bi2S3 to prepare ZnO / Bi2S3, porous ZnO particles are distributed on the outer wall of the flower-like Bi2S3, the recombination rate of electrons and holes is reduced by means of a type II heterojunction, and the gas sensing performance is improved. Under 365 nm light activation, the response value of the ZnO / Bi2S3 sensor to 100 ppm NO2 at room temperature is 1.73 times that under thermal activation (dark, 60 DEG C); 810 nm near-infrared light provides light activation and photothermal synergistic effect, the surface temperature of the gas sensor is increased to 47 DEG C, and the response value to 100 ppm NO2 is increased to 21.77.

The application relates to the technical field of hydrometallurgical gold and rare metal purification, and particularly relates to a preparation method of high-purity bismuth oxide. + The bismuth concentration in the bismuth-containing feed liquid is 80-100 g / L, the H concentration is 1-1.5 mol / L, and the NaCl concentration is 2-2.5 mol / L; an organic phase extraction is added to obtain a loaded organic phase; the organic phase comprises 25-30% of trialkylamine, 15-20% of isooctanol and kerosene in terms of volume percentage; impurities are removed through washing to obtain a purified loaded organic phase, oxalic acid solution is added for back extraction to obtain a bismuth-containing back extraction liquid; heating is carried out, ammonia water is used to adjust the pH to 3-3.5, precipitation is carried out, and after heat preservation, suction filtration is carried out to obtain large-granularity bismuth oxalate crystals; high-temperature calcination is carried out to obtain 99.999% high-purity bismuth oxide; and the core technical contradiction that an amine extraction system needs to be extracted under low acidity and bismuth ions are extremely easy to hydrolyze and precipitate under low acidity is solved.

The application relates to the technical field of lead electrolytic refining, and particularly discloses a method for removing bismuth from a lead fluosilicate electrolyte, which comprises the following steps: stirring and heating the lead fluosilicate electrolyte to 35-45 DEG C, adding a mixture of polysulfur oxysalt and a reducing agent, stirring and heating to 45-65 DEG C, reacting for 1-4.5 hours, and removing the precipitate after the reaction to obtain the filtrate, which is the lead fluosilicate electrolyte from which the bismuth is removed. The method for removing bismuth from the lead fluosilicate electrolyte can effectively remove the bismuth without losing lead, the removal rate of bismuth ions reaches more than 70%, and can reach more than 99% at the highest, metal ions which affect the purity of the electrolytic lead are not introduced, the method is simple and easy to operate, and the cost is low.

Methods of flash-within-flash (FWF) Joule heating and the systems thereof. The FWF Joule heating process subjects outer feedstock in an outer vessel to a flash Joule heating process, whereby the flash Joule heating process upon the outer feedstock results in the conversion of inner feedstock within an inner vessel (which inner vessel is within the outer vessel) to a converted material.

The application discloses a preparation method of bismuth trifluoride, and belongs to the technical field of bismuth compound preparation. The method comprises the following steps: adding a bismuth source into a reaction agent, stirring and dissolving, filtering after cooling and crystallization, so as to obtain a crystalline bismuth salt and a filtrate; calcining and decomposing the crystalline bismuth salt, so as to obtain a bismuth trifluoride product; and collecting the gas generated in the calcination and decomposition by using the filtrate, and returning the gas to the preparation process for continuous use. In the method, the bismuth source is at least one of bismuth trioxide or bismuth hydroxide, and the reaction agent is an ammonium fluoride solution. The method utilizes the low solubility of the BiF3.NH4F double salt and the thermal decomposition characteristics of NH4F to realize the preparation of bismuth trifluoride, and has the advantages of mild reaction conditions, no need of high temperature and high pressure, simple operation, no wastewater discharge in the whole process, good environmental protection, recyclable use of the reaction agent, greatly reduced production cost, high product purity and high yield, and suitability for industrial production.