241results about How to "High crystallinity" patented technology

This invention belongs to the field of gas sensor technology and discloses a method for preparing europium ferrite nanosensors and their applications. This method utilizes electrospinning technology combined with a specific low-temperature confined-domain calcination process (550℃~700℃) to prepare EuFeO3 nanotubes with a hollow structure and rough surface by taking advantage of the thermal decomposition kinetics differences of poly(p-v) magnets (PVP). This process effectively suppresses excessive repair of lattice oxygen while forming a unique tubular morphology, effectively "freezing" oxygen vacancies (O2) accounting for up to 34.44% on the material surface in situ. v This invention addresses the shortcomings of traditional solid fiber materials by constructing a sensor using a grinding, dispersion, and coating process. Utilizing the dual reactive surfaces of hollow nanotubes and high-concentration oxygen vacancy active sites, it achieves highly sensitive and selective detection of low-concentration ethylene gas released during fruit ripening. This invention solves the problems of small specific surface area and insufficient active sites in traditional solid fiber materials.

The present application belongs to the technical field of glass fiber sizing agent, and particularly relates to an anti-creep glass fiber sizing agent and a preparation method thereof. The anti-creep glass fiber sizing agent comprises effective components and water, and the solid content of the anti-creep glass fiber sizing agent is 3-12%. The effective components comprise the following components according to weight percentage: maleic anhydride modified long-chain branched polyolefin wax 65.5-86.9 wt.%, coupling agent 5-10 wt.%, nucleating agent 1-8 wt.%, physical cross-linking component 5-12 wt.%, initiator 0.1-0.5 wt.%, and surfactant 2-4 wt.%. The present application can effectively solve the problem of insufficient anti-creep ability of the glass fiber reinforced polypropylene material in the prior art, and at the same time, the material has good mechanical properties and fatigue resistance, which plays an important role in improving the long-term dimensional stability of the polypropylene material.

The invention belongs to the technical field of lithium ion battery positive electrode materials, and provides a small-particle precursor for a manganese-rich positive electrode material and a preparation method of the small-particle precursor. The manganese-rich precursor with fine primary particles and large specific surface area is prepared by using the non-ammonia complexing agent, an oxidizing atmosphere is not needed, the preparation process is simple, the process control is stable, and mass production conversion is facilitated.

The present application relates to ternary high-nickel lithium-ion battery cathode materials and a preparation method thereof. The general expression of the cathode material is Li(Ni 1‑a‑b‑c Co a Mn b D c )O2, 0.01

The invention relates to an O2-phase lithium cobalt oxide positive electrode material and a preparation method thereof, and belongs to the technical field of lithium ion batteries. The preparation method comprises the following steps: S1, uniformly mixing a doped metal source, a sodium source and a cobalt source, sintering, and cooling to obtain a P2-phase precursor; s2, uniformly mixing the P2-phase precursor, a lithium source A and the coating layer precursor, sintering, and cooling to obtain an intermediate A; s3, uniformly mixing the intermediate A and a lithium source B, sintering, and cooling to obtain an intermediate B; and S4, uniformly mixing the intermediate B and a lithium source C, sintering, cooling, washing and drying to obtain the O2-phase lithium cobalt oxide positive electrode material. The O2-phase lithium cobalt oxide positive electrode material with low residual sodium, high structural stability and excellent interface coating performance is prepared through a method of combining gradient ion exchange, gradient temperature control, gradient atmosphere regulation and control and synchronous in-situ coating.

This invention discloses a Cu2O / Cu3VO4 heterojunction catalyst, its preparation method, and its application in the photocatalytic reduction of CO2 to multi-carbon products, belonging to the field of catalyst materials technology. The preparation method includes: dissolving a copper source and a vanadium source in water to obtain a solution; mixing the solutions and adjusting the pH to 5-8 to obtain an initial solution; dispersing the solid from the initial solution after centrifugation in a mixture of ethylene glycol and water; and performing a hydrothermal reaction at 150-200℃ for 8-12 hours; washing and drying the reactants, and then calcining them at 500-600℃ for 2-5 hours under an inert atmosphere to obtain the Cu2O / Cu3VO4 heterojunction catalyst. In this catalyst, Cu2O and Cu3VO4 form a closely contacted heterojunction structure, enabling efficient separation of photogenerated electrons and holes under a built-in electric field and enhancing the absorption of visible light. Under visible light irradiation, this catalyst can reduce CO2 to multi-carbon products such as CO, CH4, C2H4, and C2H6, with an electron selectivity of up to 79% for the C2 products. The preparation process of this invention is simple and low-cost, and the resulting catalyst has broad application prospects in the field of photocatalytic CO2 reduction.

This invention discloses a method for preparing silicon carbide fibers with an in-situ boron nitride coating. The method involves melt spinning a metal-doped polycarbosilane precursor to obtain doped polycarbosilane precursor fibers. These precursor fibers are then subjected to a non-melting treatment in an oxidizing atmosphere to obtain non-melting fibers. The non-melting fibers are then subjected to inorganic pyrolysis to obtain inorganic fibers. These inorganic fibers are then densified and sintered to obtain boron-containing SiC fibers. Finally, the boron-containing SiC fibers are subjected to high-temperature treatment in a nitrogen atmosphere to obtain silicon carbide fibers with an in-situ boron nitride coating. This invention provides a simple preparation method, resulting in an in-situ self-grown BN coating with high crystallinity, good stability, and excellent uniformity. The coating is tightly bonded to the SiC fibers, is low-cost, and can be mass-produced. Furthermore, it significantly improves the fiber's temperature resistance and high-temperature creep resistance, allowing the fiber to serve for extended periods at higher temperatures.

The invention belongs to the technical field of synthesis and preparation of aluminum nitride, and discloses a controllable and extensible preparation method of a one-dimensional aluminum nitride nanowire / nanotube, which comprises the following steps: (1) uniformly mixing a solid aluminum source and a solid nitrogen source, transferring the mixture into a rotatable crucible, transferring the crucible into a tubular furnace, sealing the tubular furnace, and carrying out heat preservation for 2-3 hours; vacuumizing and then introducing protective gas; (2) under the condition that protective gas is continuously introduced, the tubular furnace is heated to a preset target temperature for a nitridation reaction, and the nitridation reaction is carried out under the condition that a crucible rotates at a constant rotating speed; and after the reaction is finished, cooling the tubular furnace and stopping the rotation of the crucible to obtain a one-dimensional aluminum nitride nanowire or nanotube product. According to the method, the solid aluminum source and the solid nitrogen source are used as raw materials, and the crucible rotation is introduced during the nitridation reaction to carry out dynamic enabling improvement, so that the single-crystal aluminum nitride nanowire or nanotube with high purity and uniform morphology can be efficiently synthesized.

This application discloses a crystal, a rare-earth-doped crystal, its preparation method, and its applications, belonging to the field of crystal materials. The chemical formula of the crystal is [Gd(L)]. 1.5 (DMA)] n Formula I; in Formula I, L is a ligand formed by deprotonated benzene polycarboxylic acid; benzene polycarboxylic acid is selected from any one of terephthalic acid, phthalic acid, and isophthalic acid; DMA is N , N -Dimethylacetamide; n ∞ represents continuous repetition and infinite extension. The crystal is rare-earth doped, and the chemical formula of the rare-earth doped crystal is [Gd]. 1‑x% (L) 1.5 (DMA)] n :x% Ln 3+ Equation II; in Equation II, x = 0.1~10; Ln 3+ Selected from Tb 3+ Or Eu 3+ Any one of the following. It has potential application value in fields such as fluorescent materials, multicolor display materials, long afterglow materials, X-ray detection and imaging materials, radiation detection dosimeters, and optical information encryption. The preparation method used in this application can be easily achieved through solution reaction under relatively mild conditions, with low cost and strong industrial feasibility.

The invention belongs to the field of coordination polymers, and discloses an antiferromagnetic tetranuclear cobalt coordination polymer constructed by mixed polydentate ligands and a preparation method and application thereof. The chemical formula of the polymer is (C9H9O6) 2 (C26H18N4) 2 (OH) 2Co4. (H2O) 7, C9H9O6 is 1, 3, 5-cyclohexane tricarboxylic acid, C26H18N4 is 1, 2, 4, 5-tetrapyridyl benzene, the polymer is a monoclinic system and a P21 / c space group, the cell parameters are alpha = 90 degrees, beta = 96.166 (8) degrees and gamma = 90 degrees, and the polymer has few defects, high crystallinity and good stability and can be applied to the fields of adsorption separation, hydrogen storage, energy storage, molecular magnets, catalysis, sensing or molecular recognition and the like.

The application relates to a multifunctional spherical Prussian blue nanolaser and a preparation method and application thereof, and belongs to the field of nanobiological materials and biological medicine. The nanolaser takes spherical Prussian blue nanoparticles as a main body structure, has good near-infrared photothermal response performance and active oxygen (ROS) removal capacity, and can improve the superoxide dismutase (SOD)-like catalytic activity and antioxidant performance by doping metal elements such as ruthenium, bismuth and manganese. The nanolaser can generate a mild photothermal effect of 38-45 DEG C under near-infrared laser irradiation, and cooperatively remove excessive active oxygen in an inflammatory microenvironment, thereby reducing the expression of inflammatory factors and matrix metalloproteinases, inhibiting the activation of the iezo1 / Piezo2 / MMP13-related inflammatory and matrix degradation pathways, and relieving oxidative stress damage and inflammatory reactions. The nanolaser has the characteristics of uniform particle size, good dispersibility, high stability and excellent biocompatibility, and can be used for the prevention of diseases such as osteoarthritis and rheumatoid arthritis. The application constructs a nanolaser system with mild photothermal regulation and antioxidant activity.

The present disclosure provides a high-rate lithium iron phosphate positive electrode material comprising lithium iron phosphate and carbon coated on a surface of the lithium iron phosphate, wherein a primary particle of the material has a particle size of 30-70 nm. The material of the present disclosure has a small and uniform primary particle size, no large single crystal particles, and a high specific surface area, and the battery prepared with the material has a high capacity, good cycle performance, excellent rate performance and low temperature performance. The present disclosure also provides a method for preparing the high-rate lithium iron phosphate positive electrode material, which has a simple process, is environmentally friendly, does not need precursors or expensive equipment, and has low cost.

The application provides a pyridyl-containing covalent organic framework fiber composite film and a preparation method thereof. The preparation method comprises the following steps: mixing an amine monomer solution and an aldehyde monomer solution to perform a condensation reaction, obtaining a first mixed solution, and obtaining pyridyl-containing covalent organic framework nanoparticles after centrifugation; wherein the aldehyde monomer solution is obtained by mixing an aldehyde monomer and an acetic acid solution, and the amine monomer solution is obtained by mixing an amine monomer containing pyridyl groups and water; mixing the pyridyl-containing covalent organic framework nanoparticles and a nanocellulose solution to obtain a second mixed solution containing covalent organic framework nanocellulose; and performing film forming treatment on the second mixed solution to obtain the pyridyl-containing covalent organic framework fiber composite film. The covalent organic framework nanoparticles are combined with nanocellulose, the high crystallinity and pore characteristics of the covalent organic framework are retained, and the mechanical strength of the composite film is improved by using the mechanical properties of nanocellulose.

The invention discloses a lithium manganate positive electrode material, a preparation method and an applied lead-lithium battery, relates to the technical field of lithium manganate positive electrode materials, and solves the problems that the existing lithium manganate positive electrode material is poor in structure and interface stability and poor in rate and cycle performance. The positive electrode material is composed of a lithium manganate matrix and a double-layer composite coating, the matrix is prepared by taking lithium carbonate and manganous-manganic oxide as raw materials and doping magnesium hydroxide, aluminum hydroxide and titanium dioxide multi-plasma phase; the lithium manganate positive electrode material is prepared by uniformly compounding a lithium manganate matrix modified by a spinel inner layer, vinyl functionalized MOF and a polyvinylidene fluoride-hexafluoropropylene copolymer on the surface of an aluminum foil receiver through an electrospinning-electrospray synergistic process. The material is applied to the lead-lithium battery, shows excellent electrochemical performance and has good practical application value.

This application relates to the field of solid waste resource utilization technology, specifically disclosing a method for synthesizing lithium iron phosphate based on sludge incineration ash through electrocoagulation-lithiation. The method involves leaching sludge incineration ash with dilute sulfuric acid to obtain a phosphate-containing acid leachate, followed by purification with a cation exchange resin to remove multivalent metal impurities. Using the purified phosphate solution as the base electrolyte, a lithium source, electrolyte, and organic carbon source are added, and the pH is adjusted. An iron plate is used as the anode and an inert electrode as the cathode for electrocoagulation. Fe²⁺ dissolved at the anode co-precipitates with PO₄³⁻ and Li⁺ in the solution to form a LiFePO₄ precursor slurry. Finally, solid-liquid separation, washing, drying, and programmed temperature sintering are performed to obtain a carbon-coated lithium iron phosphate composite material. This application has the advantage of achieving high-value utilization of sludge incineration ash.

The present invention relates to a heat-shrinkable polyester film and a method for producing the same, wherein the polyester film has excellent heat resistance, transparency, and the like, and has a crystallinity required in a molding process and / or a recycling process, thereby exhibiting improved moldability and recyclability.

The application discloses isosorbide bio-based polyurethane acrylate, which is prepared from bio-based isosorbide, bio-based 1,2-pentanediol, bio-based 1,5-pentanediol and bio-based succinic acid as raw materials through esterification reaction, vacuum polycondensation reaction, bio-based hydroxyl-terminated polyester, reaction of bio-based hydroxyl-terminated polyester and bio-based 1,5-pentamethylene diisocyanate, bio-based polyurethane, reaction of bio-based polyurethane and hydroxyethyl acrylate, and UV-curable isosorbide bio-based polyurethane acrylate. The application discloses application of the isosorbide bio-based polyurethane acrylate in preparation of UV coating, ink and adhesive. The isosorbide bio-based polyurethane acrylate is compounded with a UV monomer into a UV resin, the UV resin is compounded into a UV coating, and after curing, the UV coating has excellent properties such as high hardness, wear resistance, scratch resistance, heat resistance and weather resistance, and can be used as raw material of the UV coating, ink and adhesive.

This application provides a cathode material precursor and its preparation method, a cathode material, and a lithium-ion battery, relating to the field of new energy technology. The cathode material precursor is a secondary particle composed of primary particles, forming a composite structure. It includes an inner layer arranged radially along the center of the cathode material precursor and an outer layer composed of sheet-like primary particles stacked flat and enclosing the inner layer. The outer layer's sheets are perpendicular to the pressure direction during compaction, resulting in a secondary particle mechanical strength higher than that of common radial or block-shaped secondary particles. After inheriting this structure, the cathode material can achieve a higher compaction density than common secondary particle products, significantly improving the material's energy density. The secondary particles in this application have different sheet orientations between their inner and outer layers. The sintered cathode material inherits this characteristic structure, resulting in different expansion and contraction directions during charge-discharge cycles. This avoids or reduces the formation of cracks that could cause particle structure collapse, thereby improving cycle performance.

This invention provides a fiber-based biomimetic polyurethane artificial blood vessel and its preparation method. The method involves using wet spinning technology to obtain filaments, which are then drawn and wound onto the surface of a metal tube to form a polyurethane fiber inner layer. A fabric middle layer is woven onto the surface of the polyurethane fiber inner layer. An organic solvent is sprayed onto the surface of the fabric middle layer, and an outer polyurethane fiber layer is prepared on the fabric surface using electrospinning technology. Finally, after curing and demolding, the fiber-based biomimetic polyurethane artificial blood vessel is obtained. This invention combines wet spinning, weaving, and electrospinning technologies to achieve integrated preparation of polyurethane artificial blood vessels. The resulting artificial blood vessel is of high quality, with a tightly bonded three-layer fiber-based structure that maximally mimics the three-layer structure of natural blood vessels. The inner layer provides excellent compliance, the fabric layer increases the blood vessel's impermeability and sutureability, and the outer layer effectively prevents vascular delamination and promotes endothelialization. Furthermore, the preparation method is environmentally friendly and pollution-free, with a short process flow, making it suitable for continuous industrial production.

The invention provides aluminum fumarate and a synthesis method thereof. The synthesis method comprises the following steps: mixing organic aluminum, an organic carboxylic acid ligand and an alkaline substance in water according to a molar ratio of 1: (1.8-2.8): (1-8), and carrying out thermal reaction to obtain aluminum fumarate; wherein the organic carboxylic acid ligand is selected from one or a combination of more than two of fumaric acid, maleic acid and isophthalic acid. According to the synthesis method, organic aluminum is adopted, a large amount of heat can be released when the organic aluminum is decomposed in water, so that synthesis of aluminum fumarate is promoted, meanwhile, the decomposition process is beneficial to promotion of deprotonation of fumaric acid, reaction time is shortened, the dosage of alkaline substances is reduced, generated wastewater is closer to be neutral, cost is reduced, and the production scale is convenient to enlarge. The aluminum fumarate is of a staggered flower-shaped spherical structure, and the specific surface area of the aluminum fumarate is remarkably increased.

The invention relates to amino acid modified red-mud-based magnesium-iron-aluminum hydrotalcite and a preparation method and application thereof.The preparation method comprises the following steps that red mud and inorganic acid are mixed and heated and leached under the stirring condition, an obtained leaching product is subjected to solid-liquid separation, and upper-layer acid leaching liquid containing iron and aluminum and residues are obtained; mixing the obtained upper-layer acid leaching solution with amino acid to obtain a mixed solution; adding magnesium salt into the obtained mixed solution, and carrying out coprecipitation reaction to obtain turbid liquid; and centrifuging, washing and drying the obtained turbid liquid to obtain the amino acid modified red mud-based magnesium-iron-aluminum hydrotalcite. Iron and aluminum elements in the red mud are directly extracted, the cost is reduced, and meanwhile the performance and the additional value of the hydrotalcite product prepared from the red mud are remarkably improved; amino acid molecules are introduced, the crystallinity, the specific surface area and the adsorption capacity of the magnesium-iron-aluminum hydrotalcite are improved, a co-precipitation reaction is adopted, the reaction temperature is low, the reaction time is short, and the prepared amino acid modified red-mud-based magnesium-iron-aluminum hydrotalcite can be used for treating phosphorus-containing wastewater.

This invention relates to the field of plastic container technology, and proposes a high-temperature resistant biaxially oriented polypropylene (BOPP) plastic bottle and its preparation method. The high-temperature resistant BOPP plastic bottle comprises the following components in parts by weight: 90-100 parts polypropylene, 12-16 parts silica-modified lignin fiber, 16-20 parts block copolymer, and 0.2-0.8 parts antioxidant; the block copolymer is a PCL-PEG-PCL block copolymer. This technical solution solves the problem of poor high-temperature resistance and mechanical properties of existing polypropylene plastic bottles.

This invention belongs to the field of semiconductor materials technology and discloses a method for preparing transferable layered bismuth oxide selenide semiconductor thin films by heterolayer interface control. The method includes: 1) activating and growing a substrate; 2) depositing an interface-controlled heterolayer, which is a two-dimensional material or a water-soluble oxide; 3) CVD growing a Bi₂O₂Se thin film on the heterolayer; and 4) using a polymer support film to assist wet peeling, separating the film from the substrate and transferring it to a target substrate. This invention solves the problem of non-destructive transfer due to excessively strong adhesion between the film and substrate by introducing a heterolayer with weak interfacial interactions, and is applicable to fields such as flexible electronics and silicon-based integration.

This invention belongs to the field of hollow multi-component nanomaterial preparation technology, specifically disclosing a hollow Cu3NbSe4 nanomaterial, its preparation method, and its application. The microstructure of the nanomaterial is a nanoscale hollow cubic structure. The preparation method includes: (1) dissolving niobium source and selenium source separately in oleylamine solvent by heating for later use; (2) treating the soluble copper source and the niobium source dissolved in (1) in a high-boiling-point organic solvent for deoxygenation and dehydration, and then carrying out a solvothermal reaction; (3) when (2) is heated to a certain temperature, injecting the selenium source dissolved in (1) to carry out a solvothermal reaction, and separating the obtained solid product after the reaction is completed. The synthesis process of this invention is simple, the reaction conditions are mild, and the energy consumption and cost are low; more importantly, it realizes the preparation of hollow Cu3NbSe4 nanomaterial with uniform morphology and size, high crystallinity, and stronger light absorption capacity, and the prepared hollow Cu3NbSe4 shows excellent performance in photocatalytic hydrogen production.

This invention belongs to the field of sodium-ion battery cathode material technology, and its purpose is to provide a new synthetic technique and process for preparing sodium iron pyrophosphate composite cathode materials using an anhydrous precursor, as well as its application. This patented technology aims to overcome several key problems existing in traditional preparation processes, including the reduction in material crystallinity caused by the evaporation of water of crystallization during calcination, the poor thermal stability of sodium iron sulfate, and the low electronic conductivity of sodium iron pyrophosphate. To effectively address these challenges, this patented technology innovatively proposes a method for preparing bio-carbon-coated Na2Fe2P2O7SO4 composite cathode materials using an anhydrous precursor. This preparation method utilizes iron phosphate as a raw material, optimizes the material synthesis process, and has high feasibility and operability. Experimental results show that this composite material exhibits excellent discharge specific capacity and cycle stability, indicating its promising application prospects in the future energy storage field.

This invention proposes a method for preparing nanocrystalline lithium iron phosphate based on carboxylated iron phosphate, comprising the following steps: S1. Iron oxide red and iron powder are mixed as an iron source, dissolved in deionized water, phosphoric acid is added, and the mixture is activated at 50-150°C. A multifunctional surface activator is then added for the first aging and crystal growth, followed by pulverization; S2. An organic solvent is added, and the mixture is aged a second time at 50-150°C. The mixture is then filtered, washed, and carboxylated iron phosphate is obtained; S3. The carboxylated iron phosphate is ball-milled and mixed with a lithium source, followed by spray drying to obtain a dry powder; S4. The dry powder is sintered to finally obtain carbon-coated nanocrystalline lithium iron phosphate. This invention facilitates the synthesis of nanocrystalline lithium iron phosphate, helps obtain nanocrystalline particles with uniform size, and promotes lithium-ion diffusion.

This application relates to a polypropylene composite material, its preparation method and application, and cables. By weight, the polypropylene composite material comprises the following components: 60-80 parts polypropylene, 20-40 parts ungrafted elastomer, 0.5-1.5 parts grafted elastomer, 0.01-0.2 parts β-nucleating agent, and 3-6 parts hydrophilic agent; the hydrophilic agent includes at least one selected from ethylene-acrylic acid copolymer, polyvinyl butyral, polyacrylic acid, polyvinyl alcohol, and ethylene vinyl alcohol copolymer. The components in this polypropylene composite material interact with each other, effectively improving the water-tree resistance of the polypropylene composite material, while also exhibiting high tensile strength and elongation at break.

The application belongs to the technical field of sodium-ion battery cathode materials, and discloses a pyrophosphoric acid sodium iron phosphate composite material and a preparation method and application thereof. By regulating the microenvironment of chelation reaction, the chelation state of iron ions is optimized, iron ion precipitation is avoided, and the formation of electrochemically inert impurities is inhibited. Meanwhile, graphene oxide constructs a three-dimensional conductive network to improve the electronic transmission capacity of the material. The pyrophosphoric acid sodium iron phosphate composite material prepared by the application has small particle size, uniform dispersion, no inert impurities and is tightly coated by the conductive network. The material has a discharge specific capacity of 120.9 mAh·g ‑1 at 0.5 C, still maintains a reversible capacity of 78.1 mAh·g ‑1 at 20 C high rate, and has a capacity retention rate of 84.9% after 1000 cycles, and the full battery assembled with the hard carbon negative electrode also exhibits excellent rate and cycle performance.

The invention discloses a Cu2O / Cu3VO4 heterojunction catalyst, a preparation method of the Cu2O / Cu3VO4 heterojunction catalyst and application of the Cu2O / Cu3VO4 heterojunction catalyst in photocatalytic reduction of CO2 into a multi-carbon product, and belongs to the technical field of catalyst materials. The preparation method comprises the following steps: dissolving a copper source and a vanadium source in water to obtain a solution, mixing, and adjusting the pH value of the solution to 5-8 to obtain an initial solution; dispersing a solid obtained by centrifuging the initial solution into a mixed solution of ethylene glycol and water, and carrying out a hydrothermal reaction at 150-200 DEG C for 8-12 h; and washing and drying reactants, and calcining the reactants in an inert atmosphere at 500-600 DEG C for 2-5 hours to obtain the Cu2O / Cu3VO4 heterojunction catalyst. In the catalyst, Cu2O and Cu3VO4 form a close-contact heterojunction structure, so that efficient separation of photo-induced electrons and holes can be realized under the driving of a built-in electric field, and absorption of visible light is enhanced. Under the irradiation of visible light, the catalyst can reduce CO2 into CO, CH4, C2H4, C2H6 and other multi-carbon products, and the electron selectivity of the C2 product can reach 79%. The preparation process is simple, the cost is low, and the obtained catalyst has a wide application prospect in the field of photocatalytic CO2 reduction.

This invention provides an organic eutectic material with a controllable charge-transfer exciton diffusion coefficient and its preparation method. The molecular formula of this organic eutectic material is (TSB). x (TSB-Br) 1‑x (TCNB)2, wherein TSB is trans-1,2-stilbene, TSB-Br is trans-4-bromostilbene, TCNB is 1,2,4,5-phenylenetetraacetonitrile, and x is the proportion of TSB molecules. The organic eutectic material prepared by this invention has a regular morphology, high crystallinity, and exhibits both strong and delayed fluorescence emission, with continuously tunable diffusion coefficients for singlet and triplet charge-transfer excitons. The preparation method described in this invention has advantages such as low raw material cost, mild conditions, and simple operation. The prepared (TSB)2... x (TSB-Br) 1‑x (TCNB)2 organic eutectic materials have potential applications in fields such as imaging, photoelectric conversion, and spintronics.