53results about How to "Lower bandgap" patented technology

The invention provides a sodium ferric pyrophosphate positive electrode material cooperatively doped with anions and cations, a preparation method of the sodium ferric pyrophosphate positive electrode material and a sodium ion battery, and relates to the field of sodium ion batteries. The anion and cation synergistically doped ferric sodium phosphate pyrophosphate positive electrode material comprises an inner core and a coating layer covering the outer surface of the inner core, the inner core comprises ferric sodium phosphate pyrophosphate, the coating layer comprises carbon, the chemical formula of the ferric sodium phosphate pyrophosphate is Na4-2yFe2.91-xQx (PO4) 2-yP2O7Fy, x is more than 0 and less than or equal to 0.3, and y is more than or equal to 0.03 and less than or equal to 0.08; q comprises at least one of Sn, Ni, Cu, Mg and Mn. The introduced Q positive ions and F negative ions can keep the crystal structure of the body material stable, and the positive ions and the negative ions have a synergistic effect, so that the band gap of the positive electrode material is reduced, the state density near the Fermi level of the positive electrode material is increased, the conductivity of the positive electrode material is enhanced, the specific capacity of the positive electrode material is improved, and the rate and the cycle performance are promoted.

The invention belongs to the field of polymer modification and processing, and particularly relates to a nano photocatalytic self-cleaning composite material, a fresh-keeping cover and a preparation method of the fresh-keeping cover. The composite material comprises aliphatic nylon, a maleic anhydride grafted copolymer, nano titanium dioxide, carbon nanotubes, boron nitride, a coupling agent, a release agent and an antioxidant. The nano photocatalytic self-cleaning composite material is prepared by taking nano titanium dioxide as an antibacterial active agent and adding a certain amount of carbon nanotubes and boron nitride powder. The carbon nanotubes can conduct electrons, have high surface area and high adsorption capacity, and are good dopants and carriers for titanium dioxide as photocatalysts. Hexagonal boron nitride can effectively improve separation and transfer of photo-induced electron-hole pairs of the material, so that the visible light response photocatalytic activity is enhanced. And by adding the carbon nanotubes and boron nitride, the dispersing performance of nano titanium dioxide can be physically improved, titanium dioxide agglomeration is prevented, and the photocatalytic self-cleaning performance of the nano titanium dioxide is improved.

The invention belongs to the technical field of environmental treatment, and discloses a nano RuAg / heterojunction MoO3 / TiO2 composite catalyst as well as a preparation method and application thereof, and the nano RuAg / heterojunction MoO3 / TiO2 composite catalyst is prepared by compounding mesoporous TiO2 with microporous MoO3 to form heterojunction MoO3 / TiO2 and then compounding the heterojunction MoO3 / TiO2 with a RuAg alloy. The nano RuAg / MoO3 / T iO2 has a mesoporous-microporous gradient structure, has a large specific surface area, and has good adsorption performance and high catalytic degradation performance on VOCs (Volatile Organic Compounds). According to the present invention, the composite catalyst can effectively degrade the VOCs while adsorbing the VOCs, such that the adsorption efficiency and the treatment effect of the molecular sieve on the VOCs are substantially improved, the integration of the adsorption and the degradation is achieved, and the VOCs treatment process flow is simplified.

The invention discloses a near-infrared light response ultrathin nanosheet sulfur-doped BiOCl photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalytic materials. The preparation method comprises the following technical steps: (1) preparing a BiOCl nanosheet; and (2) preparing the sulfur-doped BiOCl nanosheet. By adopting a secondary hydrothermal method and controlling the dosage of thioacetamide and BiOCl nanosheets, the prepared catalyst is an ultrathin nanosheet with uniform morphology, the average size is 70-120nm, the catalyst has light response in a near-infrared light region of 780-1200nm, the light absorption capacity of the catalyst is better, and near-infrared light response can be achieved. The catalyst is applied to catalytic degradation of ENR, the ENR degradation rate under visible light is 66.87%, and the degradation effect is good; under near-infrared light, the ENR degradation rate is 9.25%, and the degradation performance from zero to existence is achieved. The preparation method disclosed by the invention is simple, mild in condition, easy to control, low in raw material consumption, free of complex operations such as centrifugation, low in preparation cost and easy to popularize and apply.

According to the double-site doped ferric sodium pyrophosphate / carbon composite positive electrode material and the preparation method thereof, tungstate is introduced in the raw material mixing process, and the Fe site and the PO4 site are respectively occupied in the forms of W < 6 + > and WO4 < 2-> in the synthesis process; the chemical formula of the obtained double-site doped ferric pyrophosphate sodium / carbon composite positive electrode material is Na4Fe3-xWx (PO4) 2-y (WO4) y (P2O7) / C, x is greater than or equal to 0 and less than or equal to 0.3, and y is greater than or equal to 0 and less than or equal to 0.3. The invention also comprises a preparation method of the double-site doped ferric sodium pyrophosphate / carbon composite positive electrode material. According to the double-site doped ferric pyrophosphate sodium / carbon composite positive electrode material, the phase purity is greatly improved, non-active marmite type ferric phosphate sodium and low-capacity ferric pyrophosphate sodium impurity phases do not exist, and sodium-iron antisite defects in the structure are obviously reduced. The positive electrode material is good in electronic conductivity and ionic conductivity, high in specific capacity, good in rate capability and long in cycle life, and the high and low temperature performance is also remarkably improved.

The invention discloses a preparation method of a hollow ball-flower niobium pentoxide material. The preparation method comprises the following steps: dissolving a niobium source in a mixed solution of ethanol and deionized water; adding a certain amount of urea; carrying out heating reaction on the obtained mixed solution; and cooling, washing, drying and roasting to obtain the catalyst. The prepared hollow ball-flower-shaped niobium pentoxide material is composed of nanosheets with the thickness of about 15 nanometers and is hollow inside, the transmission distance of lithium ions and electrons is shortened, and the internal hollow structure plays a role in buffering the volume change of the niobium pentoxide material in the lithium intercalation and deintercalation process; meanwhile, N doping is realized at a reduction site in the synthesis process, and the conductivity of niobium pentoxide is improved by N doping, so that the niobium pentoxide has excellent electrochemical performance when being used as a lithium ion battery negative electrode material. In addition, the synthesis process is simple, the reaction controllability is high, and large-scale production is easy.

The invention discloses a conjugated polymer film with electrical properties and tensile stability simultaneously improved, and a preparation method and application thereof, and belongs to the technical field of flexible electronic materials. The preparation method comprises the following steps: placing the conjugated polymer film in a solution formed by mixing an electrolyte and a dopant, and soaking for 30-60 seconds to complete ion exchange doping, thereby obtaining the conjugated polymer film with various carrier transport channels. The strategy of increasing the types of carrier transmission channels is adopted, and two main transmission channels of a crystal phase and an accumulation region are formed in the conjugated polymer film through an ion exchange doping method, so that the conjugated polymer film can maintain the electrical property at a high proportion under a stretching external field, and the electrical property of the conjugated polymer film is improved under the same stretching strain. And the tensile stability of the conductivity is far higher than that of a conjugated polymer film which only takes a crystal phase or an accumulation region as a carrier transmission channel.

This invention provides a photocatalytic composite nanoenzyme self-cleaning coating, its preparation method, and its application. Specifically, it includes: preparing solution A with Ca(NO3)2·4H2O and nano-cerium oxide; preparing solution B with (NH4)2HPO4 and hexadecyltrimethylammonium bromide; mixing solutions A and B, and reacting at high temperature to obtain cerium oxide nanoenzyme / hydroxyapatite microspheres; and using (NH4)6Mo7O... 24 Solution M is prepared by dissolving Fe(NO3)3·9H2O in deionized water; solution N is prepared by dissolving Fe(NO3)3·9H2O in deionized water; solutions M and N are mixed to obtain a precursor; the precursor is reacted with cobalt oxide at high temperature to obtain Co / Fe2(MoO4)3; tetraethyl orthosilicate, anhydrous ethanol, deionized water, and ammonia are mixed and sealed for aging; after adding a modifier, it is mixed with cerium oxide nanoenzyme / hydroxyapatite microspheres and Co / Fe2(MoO4)3, sprayed onto the obtained composite coating, and cured at high temperature to obtain a self-cleaning coating. This invention, by loading a photocatalyst and nanoenzyme / hydroxyapatite microspheres onto the surface of a modified SiO2 gel, effectively improves the photocatalytic activity and self-cleaning performance of the coating while maintaining good optical transmittance.

This invention discloses a wide-interlayer-spacing molybdenum disulfide catalyst, its preparation method, and its application, belonging to the field of water electrolysis for hydrogen production energy conversion technology. The preparation method includes the following steps: preparing a molybdenum disulfide precursor solution using a molybdenum source and a sulfur source; then subjecting the molybdenum disulfide precursor solution to a hydrothermal reaction with a carbon-containing interlayer-spacing regulator; and obtaining the wide-interlayer-spacing molybdenum disulfide catalyst after centrifugation and washing. The carbon-containing interlayer-spacing regulator is used to insert into the interlayer of molybdenum disulfide during the hydrothermal reaction, increasing the interlayer spacing of the (002) crystal planes of the obtained molybdenum disulfide catalyst. The wide-interlayer-spacing molybdenum disulfide catalyst of this invention facilitates electrolyte penetration and hydrogen bubble release, effectively avoids active site blockage, enhances the intrinsic conductivity of the catalyst, accelerates internal charge transport, increases active sites for hydrogen evolution reaction, and improves the intrinsic hydrogen evolution catalytic activity of the catalyst.

The invention discloses a hydroxyl-substituted hexaaza-naphthalene derivative as well as preparation and application thereof, and the method comprises the following steps: preparing a HATN-X precursor from cyclohexanehexone and halo-1, 2-phenylenediamine, mixing the HATN-X precursor with a molten mixture of sodium hydroxide and potassium hydroxide, fully grinding, reacting at 170-250 DEG C, cooling, stirring, and carrying out suction filtration to obtain filtrate; and adjusting the pH value of the filtrate to be acidic, stirring, carrying out suction filtration, washing and drying to obtain the hydroxyl-substituted hexaaza-naphthalene derivative. Based on the nucleophilic substitution reaction of the halogenated electricity-deficient aromatic compound in the molten potassium hydroxide and sodium hydroxide eutectic solution, the problems of more steps and more expensive used precursor in the existing method are solved, the method is simple and easy to implement, the raw materials are easy to obtain, and the method is suitable for industrial production. The prepared hydroxyl-substituted hexaaza-naphthalene derivative has good electrochemical performance, and has huge application potential and wide market prospect in the fields of battery materials and energy storage.

The present invention relates to a high entropy perovskite type absorption coating with ultra-wideband electromagnetic wave absorption characteristics, which is composed of the following raw materials in mass fractions: 8-16 parts of absorption pigment, 2-4 parts of filler, 20-40 parts of binder, 22-65 parts of ultrapure water, and 10-15 parts of auxiliary agent; the light-absorbing pigment is a high entropy perovskite ceramic pigment, and its molecular formula is ABO3, wherein A is any five elements of La, Pr, Ca, Ce, Gd, Sm, Nd, Nb, and Dy, and each metal element is in an equal molar ratio; B is one of the metal elements Cr, Co, Mn, Fe, and Al. The coating obtained by the present invention has an absorption rate of not less than 0.95 in the 0.3-2.5 μm band of sunlight, and an absorption rate of not less than 0.92 in the ultra-wide band range of 0.3-16 μm. At the same time, the coating has the characteristics of high temperature corrosion resistance and high matching degree with the thermal expansion coefficient of the substrate, and can be applied to high-temperature concentrated solar power generation systems and industrial waste heat collection.

The present invention relates to a composite adsorption-photocatalyst and a preparation method thereof, and belongs to the technical field of photocatalytic materials. The composite adsorption-photocatalyst is based on graphene-like carbon nitride, and three elements of iron, oxygen and phosphorus are co-doped in the matrix; wherein the doping amount of the iron element is 0.8-7% of the mass of the matrix, the doping amount of the oxygen element is 12-33% of the mass of the matrix, and the doping amount of the phosphorus element is 1.4-10% of the mass of the matrix; the band gap width of the composite adsorption-photocatalyst is 2.1-2.6eV; the composite adsorption-photocatalyst enhances the adsorption performance through the synergistic effect of the metal element Fe and the non-metallic elements O and P co-doped into the graphene-like carbon nitride, and further reduces the band gap of the composite adsorption-photocatalyst, adjusts the electronic structure, enhances the photogenerated electron transfer efficiency and the visible light response range, and improves the photocatalytic activity.

The present invention relates to an oxygen defect-modified ferroelectric compound Z-type heterojunction photocatalytic material and a preparation method and application thereof, and belongs to the field of photocatalytic technology. The present invention utilizes bismuth tungstate and carbon nitride to construct a heterojunction while introducing an oxygen defect state, thereby forming an amorphous layer with a large number of electron donor states concentrated at the heterojunction interface to stabilize the formation of the heterojunction. The introduction of oxygen vacancies, on the one hand, introduces donor energy levels inside the ferroelectric material to enhance the utilization efficiency of visible light, and on the other hand, the oxygen vacancy amorphous layer formed on the surface of the ferroelectric material nanoparticles is more conducive to the charge transfer between the heterojunctions, thereby stabilizing the structure of the Z-type heterojunction, thereby achieving the visible light catalytic efficient degradation of pollutants.

The invention discloses a preparation method and application of a spirofluorene xanthene-based grignarene fluorescent material. [spirofluorene xanthene-fluorobenzene]-based grignarene (G-DSFX) is synthesized by adopting a C-H bond activation gridding method. The optimal reaction conditions are as follows: the catalyst is palladium acetate Pd (OAc), the ligand is tri-tert-butylphosphine tetrafluoroborate PtBu2Me-HBF4, the alkali is potassium carbonate K2CO3, the solvent is N, N-dimethylacetamide DMAc, the temperature is 120 DEG C, the reaction is performed for 48 hours, the reaction concentration is 20 mmol. L <-1 >, and the yield is as high as 19%. The OLED is prepared by adopting a solution processing method, I-shape, U-shape, m-shape and G-DSFX are used as OLED light-emitting layers for device testing by utilizing the solution processing method, and turn-on voltages are 3.9 V, 6.9 V, 4.5 V and 6.4 V respectively; the maximum brightness is 67.9 cd.m <-2 >, 56.69 cd.m <-2 >, 45.43 cd.m <-2 > and 72.2 cd.m <-2 > respectively; the maximum external quantum efficiency EQEmax is 0.08%, 0.06%, 0.03% and 0.15%, which proves that the lattice strategy can also improve the brightness and the external quantum efficiency of the device, and provides a reference for preparing an OLED by a solution processing method.

The invention discloses a magnetic ternary chalcogenide two-dimensional nanosheet material as well as a preparation method and application thereof, and belongs to the technical field of biological medicines. The chemical structural general formula of the material is ABC2 at a targeting ligand, in which A is Cu or Ag, B is a ferromagnetic element, and C is S, Se or Te. The magnetic ternary two-dimensional nanosheet material is simple to operate and easy to popularize, and the magnetic ternary two-dimensional nanosheet material can be used for achieving CT enhanced imaging of related diseases, MRI enhanced imaging, related disease treatment and other biomedical applications.

The application provides a Bi2O2CO3-MIL-68(In) heterojunction composite material and a preparation method and application thereof, and belongs to the technical field of photocatalytic materials, the field of persulfate catalysis and the field of environmental governance. The composite material is obtained by loading Bi2O2CO3 on the surface of MIL-68(In) to form a Z-type heterojunction structure; the Bi2O2CO3 is a spherical body with a diameter of 200-500 nm, and the surface is a stacked granular structure; the MIL-68(In) is a regular hexahedral rhombic rod-shaped structure with a particle size of 5-10 mu m, and the Bi2O2CO3 is dispersedly loaded on the surface of the MIL-68(In). The application has the advantages of simple operation, strong visible light absorption capacity of the heterojunction material, stable photocatalytic performance, high degradation efficiency and the like, and has a potential application prospect in the field of photocatalytic persulfate.

The application belongs to the technical field of iodine-containing wastewater treatment, and specifically provides a method for treating iodine-containing wastewater, which comprises the following steps: mixing a metal-doped bismuth tungstate material for treating iodine-containing wastewater with a binder and a conductive agent to prepare a slurry, coating the slurry on a conductive substrate, and drying to obtain a membrane electrode, and using the obtained membrane electrode to treat iodine-containing wastewater; and a preparation method of the metal-doped bismuth tungstate material for treating iodine-containing wastewater, which comprises the following steps: 1) dissolving bismuth salt and iron salt in a solvent to prepare a mixed solution; 2) adding a tungstate solution to the mixed solution to form a suspension, and then performing a hydrothermal reaction, collecting the precipitate after cooling, and washing and drying to obtain the product. The metal-doped bismuth tungstate material prepared by the application has the advantages of high specific surface area and good photo-assisted electric adsorption performance.

This invention provides a fluorine-doped ZnIn2S4 photocatalyst, its preparation method, and its application. The fluorine-doped ZnIn2S4 photocatalyst has a spherical nanoflower structure, which is composed of nanosheets arranged in an array. The preparation method includes the following steps: (1) adding ZnCl2, InCl3·4H2O, and thioacetamide to water and stirring to obtain a mixture A; (2) adding a fluorine source to mixture A and mixing thoroughly to obtain mixture B; (3) subjecting mixture B to a hydrothermal reaction, separating the product after the reaction, washing, and drying to obtain the F-ZnIn2S4 photocatalyst. The fluorine-doped ZnIn2S4 photocatalyst exhibits highly efficient photocatalytic activity.

The present invention discloses a preparation and application of a CuS@NiCo‑LDHs hollow nano-octahedron heterojunction electrocatalyst. The preparation method comprises the following steps: using a Cu2O nano-octahedron as a hard template to undergo a precipitation conversion reaction with a soluble sulfide, growing a CuS shell layer on the surface of the Cu2O nano-octahedron, and obtaining a Cu2O@CuS nano-octahedron core-shell structure intermediate; etching the Cu2O@CuS nano-octahedron core-shell structure intermediate with an inorganic strong acid to remove the Cu2O core to obtain a CuS hollow nano-octahedron; heterogeneously growing a layer of NiCo‑LDHs nanosheets on the surface of the CuS hollow nano-octahedron to obtain the CuS@NiCo‑LDHs hollow nano-octahedron heterojunction electrocatalyst. The preparation method of the present invention is simple, the raw materials are abundant and easy to obtain, the time-consuming cycle is short, the product has high catalytic activity and good stability, and can be used for alkaline electrocatalytic oxygen evolution reaction.

This invention relates to the field of nanoscale full-spectrum photocatalytic materials, and particularly to a method for preparing a molybdenum selenide / oxygen-deficient bismuth oxybromine@gold three-phase Z-type heterojunction photocatalyst. This method solves the problems of low photogenerated electron-hole separation efficiency, narrow full-spectrum response range, and poor stability in existing bismuth-based photocatalysts. The preparation method involves first preparing oxygen-deficient BiOBr nanospheres via a solvothermal method, then directly reacting tetrachloroauric acid with oleylamine in toluene to prepare small-particle-size monodisperse Au nanoparticles, which are then combined with oxygen-deficient BiOBr to prepare a BiOBr@Au nanosphere core-shell structure. Finally, a MoSe2 / oxygen-deficient BiOBr@Au three-phase composite material is prepared via a hydrothermal reaction. The catalyst of this invention exhibits absorption capacity under the full spectrum of light, and simultaneously achieves a synergistic enhancement of carrier separation efficiency and strong redox capability, demonstrating excellent photocatalytic activity and the ability to efficiently degrade pollutants and produce hydrogen.

The invention discloses a rare earth ytterbium and erbium co-doped titanium dioxide-zinc oxide composite photocatalyst and a preparation method thereof, zinc oxide and titanium dioxide are compounded to obtain the composite photocatalyst, then rare earth Yb < 3 + > and Er < 3 + > are doped, and the proportion of the rare earth Yb < 3 + > and Er < 3 + > to Zn needs to be configured; wherein n (Zn): n (Ti) = 5%, 10% and 15%, and the doping proportion of Er < 3 + > is fixed to be n (Er): n (Ti) = 1%, 2.5% and 5%; and Yb < 3 + > is respectively n (Yb): n (Ti) = 1%, 2.5% and 5%. According to the method, a novel titanium dioxide composite material is prepared by adopting a sol-gel method, titanium dioxide is taken as a substrate, a zinc oxide semiconductor is compounded, and rare earth ytterbium and erbium ions are doped, so that compared with commercial titanium dioxide, the prepared novel material has obviously improved degradation efficiency on printing and dyeing wastewater taking methylene blue as an example, and the method is simple, convenient and efficient; the photocatalytic degradation of the printing and dyeing wastewater can be popularized on a large scale.

The invention belongs to the technical field of battery materials, and particularly relates to an iron-based mixed polyanion material as well as a preparation method and application thereof. The invention provides a preparation method of an iron-based mixed polyanion material, which comprises the following steps: (1) mixing a sodium source, an iron source, a phosphorus source, a nickel source and a carbon source to prepare a mixture; and (2) freeze-drying and sintering the mixture to prepare the iron-based mixed polyanion material. The iron-based mixed polyanion material prepared by the invention has a pseudo-single crystal structure and good cycle performance.

This invention belongs to the field of organic light-emitting materials and semiconductor technology, and provides a multi-aryl aromatic heterocyclic compound, its preparation method, and an electroluminescent device. The structural formula of the multi-aryl aromatic heterocyclic compound is: [structure omitted]. Using this multi-aryl aromatic heterocyclic compound as the guest light-emitting material, the luminous efficiency of the electroluminescent device is effectively improved, its lifespan is extended, and the purity of the emitted color is significantly improved. The light emitted by the electroluminescent device is in the green to red light range.

This invention relates to a high-entropy polymetallic organic framework-assisted reinforced magnesium hydride solid-state hydrogen storage material, which is composed of magnesium hydride and a high-entropy polymetallic organic framework in a mass ratio of 30-90:10-70, and its chemical formula is MgH. 2 -(FeCoNiCrMn) 3 O 4 The high-entropy multimetal-organic framework is composed of five different metal cations coordinated in an equimolar ratio; the metal cations are selected from cobalt, nickel, iron, chromium, and manganese. The material of this invention exhibits a high-entropy effect and possesses excellent thermodynamic properties and hydrogen storage cycle performance.

The invention discloses a conjugated microporous polymer with visible light response and application thereof. The specific structure of the conjugated microporous polymer enables the conjugated microporous polymer to have visible light responsiveness, and the utilization rate of the conjugated microporous polymer to visible light is improved. The conjugated microporous polymer can be used for adsorbing and / or degrading perfluorinated compounds. The conjugated microporous polymer and PDS synergistic photocatalytic degradation system provides a green, efficient and low-energy-consumption method for degradation of perfluorinated compounds under visible light, and has certain industrial application potential.

The invention provides a sisal hemp residue derived red light carbon dot photosensitizer as well as a preparation method and application thereof, and belongs to the technical field of nano functional materials and biomass resource utilization. The method comprises the following steps: dispersing the sisal residue in water, adding urea, stirring at room temperature, and carrying out hydrothermal reaction; and after the reaction is completed, filtering, dialyzing and drying a product in sequence to obtain the sisal hemp residue derived red light carbon dot photosensitizer. The method is wide in raw material source, low in cost, simple in process, green and environment-friendly. The particle size of the prepared red light carbon dot photosensitizer is 2-6 nm, the red light carbon dot photosensitizer has a remarkable red light emission peak at the position of 660-680 nm, especially can efficiently generate active oxygen under excitation of light with the wavelength of 660 nm, has a good application prospect in the fields of photodynamic therapy, photocatalytic disinfection, biological imaging and the like, and provides a new way for developing a novel photosensitizer which is low in cost, efficient and environmentally friendly.

The present invention discloses a composite fiber of carbon nanotubes embedded with photocatalytic nanoparticles, and its preparation method and application. The composite fiber of carbon nanotubes embedded with photocatalytic nanoparticles comprises a fiber body and a functional phase; the fiber body has an interpenetrating network structure, and the interpenetrating network structure has interpenetrating pores; the functional phase comprises photocatalytic nanoparticles embedded in the interpenetrating pores; the functional phase and the network structure form a geometric structure of stacking layers. The preparation method comprises: providing a carbon nanotube precursor and an impregnation liquid, the impregnation liquid comprises a dispersant and photocatalytic nanoparticles; immersing the carbon nanotube precursor in the impregnation liquid to obtain a wet precursor; annealing the wet precursor to obtain a composite fiber of carbon nanotubes embedded with photocatalytic nanoparticles. The composite fiber of carbon nanotubes embedded with photocatalytic nanoparticles provided by the present invention has the advantages of uniform catalyst dispersion, high content, good performance stability, long service life, response to visible light, and good catalytic performance.

The present invention relates to a type of boron-hetero molecular carbon compound with near-infrared absorption and a preparation method and application thereof, and belongs to the technical field of near-infrared absorption materials. The problems of the difficulty in designing and synthesizing stable boron-containing organic materials with near-infrared absorption in the prior art are solved. The boron-hetero molecular carbon compound with near-infrared absorption of the present invention has a structural formula as shown in 1‑13. The present invention also provides the use of the above-mentioned boron-hetero molecular carbon compound with near-infrared absorption in the preparation of organic functional materials with near-infrared absorption, bipolar organic field-effect transistor materials, and organic spintronic device materials. The boron-hetero molecular carbon compound has good solubility in a variety of organic solvents and has near-infrared absorption properties. The light absorption range, light absorption capacity and energy level band gap can be regulated by a conjugated structure. The synthesis method is simple, the yield is high, the purification process is convenient, and it is conducive to large-scale synthesis.

This invention discloses a bifunctional three-dimensional porous composite material and its preparation method and application. The method includes the following steps: (1) adding a carbon source to deionized water and stirring to obtain a uniformly dispersed solution; (2) dissolving a rare earth metal source, a transition metal source, and a sulfur source in deionized water and stirring to obtain a precursor solution; (3) mixing the solution obtained in step (1) and the precursor solution to obtain a mixed solution and performing a hydrothermal reaction; (4) repeatedly washing the product obtained in step (3), drying it, and then performing heat treatment to prepare the bifunctional three-dimensional porous composite material. The bifunctional three-dimensional porous composite material can effectively buffer the volume expansion effect of the sulfur cathode during charging and discharging and promote the full wetting of the electrolyte. On the other hand, it also improves the conductivity and catalytic activity of the composite material through the doping of rare earth elements, effectively improving the electrochemical performance of lithium-sulfur batteries.

The invention discloses a preparation method and low-temperature application of a Te-doped tungsten niobium oxide / molybdenum niobium oxide heterojunction, and belongs to the technical field of secondary batteries. The preparation method specifically comprises the following steps: carrying out high-energy ball milling and alloying on WO3, Nb2O5 and Te2O5 to obtain amorphous Te-doped tungsten niobium oxide; the preparation method comprises the following steps: carrying out high-energy ball milling and alloying on MoO3, Nb2O5 and Te2O5 to obtain amorphous Te doped molybdenum niobium oxide; uniformly mixing and compacting the amorphous Te doped tungsten niobium oxide and the amorphous Te doped molybdenum niobium oxide, and performing discharge plasma sintering in an inert atmosphere to obtain the ceramic crystal Te doped tungsten niobium oxide / molybdenum niobium oxide heterojunction material. The Te-doped tungsten niobium oxide / molybdenum niobium oxide two-phase heterojunction material designed by the invention is relatively short in synthesis time, the synthesis period is shortened, the size of crystal grains is convenient to regulate and control, the crystallinity of the material is very good, the diffusion rate of lithium ions is greatly promoted by a heterojunction interface, the electron conductivity is improved by cooperating with Te doping, and the performance of the Te-doped tungsten niobium oxide / molybdenum niobium oxide two-phase heterojunction material is improved. The material can be used as a lithium ion negative electrode material with fast charging characteristic and good low-temperature performance.