270 results about "Fluorine doping" patented technology

The invention provides a positive electrode material, a lithium ion battery and a preparation method, and relates to the technical field of battery materials. The positive electrode material comprises an inner core and a coating layer, the inner core is a ternary material matrix, the coating layer is a fluorine-doped lithium cobalt oxide material, the lithium cobalt oxide material contains Co < 2 + > and Co < 3 + >, and in the coating layer, the fluorine element and the Co < 2 + > are both distributed progressively from the surface to the center. The positive electrode material effectively improves the capacity fading problem under high voltage, and shows excellent circulation capability, high capacity and low impedance under high voltage.

The invention discloses a modified carbon-coated sodium manganese ferric phosphate pyrophosphate / sodium ferric phosphate pyrophosphate positive electrode material as well as a preparation method and application thereof, and relates to the technical field of new energy materials. The preparation method comprises the following steps: preparing MnFe-MOF from a manganese source, a first iron source and a first organic ligand under a hydrothermal reaction; a second iron source, the MnFe-MOF and a second organic ligand are subjected to a hydrothermal reaction, and MnFe-MOF / Fe-MOF is obtained; uniformly mixing with a sodium source and a phosphorus source, and sintering to obtain a positive electrode material; and carrying out high-temperature gas-phase etching treatment to obtain the fluorine-doped carbon-coated modified sodium manganese ferric phosphate pyrophosphate / sodium ferric phosphate pyrophosphate positive electrode material. The material disclosed by the invention has a coating modified structure, so that an interface side reaction caused by direct contact between sodium ferromanganese phosphate and an electrolyte can be effectively avoided, a manganese dissolution phenomenon is reduced, and the structural stability of the material is improved; and meanwhile, the material has high conductivity, excellent structural stability, excellent long cycle life and excellent rate capability.

The invention relates to the technical field of crystalline silicon solar cells, and particularly discloses a low parasitic absorption TOPCon solar cell which comprises an N-type silicon substrate, a boron emitter is arranged on the front surface of the N-type silicon substrate, a front passivation layer and an antireflection layer are arranged on the side face of the boron emitter, and a tunneling oxide layer is arranged on the back surface of the N-type silicon substrate. Hydrogenated lightly-doped polycrystalline silicon and hydrogenated heavily-doped polycrystalline silicon are arranged on the side surface of the tunneling oxide layer, and conductive oxide is arranged between the hydrogenated lightly-doped polycrystalline silicon and the hydrogenated heavily-doped polycrystalline silicon. According to the low parasitic absorption TOPCon solar cell provided by the invention, on the basis of a TOPCon cell, the thickened fluorine-doped tin oxide is used as the second conductive oxide layer by utilizing the transparent and conductive characteristics of the fluorine-doped tin oxide. Inward diffusion of phosphorus atoms can be effectively prevented during annealing, and inward diffusion of metal Ag can be limited during sintering. Thus, the thinned outer layer hydrogenated heavily doped Poly-Si is configured through the thickened fluorine-doped tin oxide, so that parasitic absorption is reduced.

The invention discloses a method for recovering a PVDF (Polyvinylidene Fluoride)-containing positive electrode material from a waste lithium iron phosphate battery and preparing fluorine-doped lithium iron phosphate, and belongs to the technical field of waste battery recovery. The method comprises the following steps: discharging and disassembling waste lithium iron phosphate batteries to separate out positive plates; soaking the positive plate in hot water, and separating to obtain an invalid lithium iron phosphate positive electrode material containing PVDF and an aluminum foil; the preparation method comprises the following steps: drying and grinding the PVDF-containing invalid lithium iron phosphate positive electrode material into powder, uniformly mixing the powder with LiOH, and calcining in a non-oxidizing atmosphere to obtain the fluorine-doped lithium iron phosphate. According to the method, PVDF in the failed lithium iron phosphate material is fully utilized, the failed lithium iron phosphate positive electrode material can be efficiently repaired, the fluorine-doped lithium iron phosphate positive electrode material with better electrochemical performance is obtained, and the method is simple in process, convenient to operate and efficient.

The invention discloses a fluorine-nitrogen-doped carbon-based oxygen reduction electrocatalyst for a zinc-air battery and a preparation method of the fluorine-nitrogen-doped carbon-based oxygen reduction electrocatalyst, and belongs to the technical field of catalysts. According to the method, a fluorocarbon mixture is rapidly treated through Joule heat to achieve efficient fluorine doping, then nitrogen doping is conducted through an ammonia gas plasma technology, and therefore an original carbon precursor is converted into fluorine-nitrogen-doped carbon. The catalyst material is short in preparation time and high in production efficiency, the content configuration of fluorine and nitrogen doped in fluorine-nitrogen-doped carbon finally formed by accurately controlling the temperature and time of Joule heat treatment and the power and time of plasma treatment is controllable, the morphology and the pore structure are controllable, high electro-catalytic performance is guaranteed, and the catalyst material is suitable for industrial production. The preparation method is high in production efficiency and low in cost, and has large-scale amplification potential.

The invention relates to a composite diaphragm with high ionic conductivity, a composite solid electrolyte and a preparation method thereof. The composite diaphragm is composed of a lithium lanthanum-based fluorine-doped solid electrolyte LLMOF and a base membrane, the chemical general formula of the LLMOF is Li < x > La < y > M < 1 > < z > M < 2 > < w > M < 3 > O < 6 > F, wherein M1 is a tetravalent cation, M2 is a pentavalent cation, and M3 is a hexavalent cation; 1 < x + 3y < 5, 0 < x < = 2, and 1 / 3 < y < 5 / 3; 0 < = z < = 2, 0 < = w < = 2, 0 < = u < = 2, z + w + u = 2; the base membrane is a large-aperture base membrane, and the aperture r is more than or equal to 200nm and less than or equal to 1mu m; the particle size D50 of the LLMOF is 50 nm to 1 [mu] m, and the particle size D50 of the LLMOF is less than or equal to the aperture r of the base film. According to the composite diaphragm disclosed by the invention, the LLMOF solid electrolyte with an ion channel function is introduced, so that efficient conduction of ions is realized; the particle size is matched with that of a large-aperture base membrane, the membrane can be uniformly embedded into membrane holes, a continuous conduction path is constructed, and the ionic conductivity is improved; meanwhile, the composite diaphragm has excellent thermal stability and interface wettability, interface impedance is effectively reduced, and growth of lithium dendrites is inhibited.

The invention relates to the technical field of positive electrode materials, and discloses a preparation method of a carbon-coated fluorine-doped sodium ferric sulfate positive electrode material, which comprises the following steps: step 1, adding an iron source, a sodium source, a sulfur source, a carbon source and a fluorine source into deionized water, and heating and stirring to completely dissolve the raw materials to obtain a solution A; 2, converting the solution A into precursor powder B by using a spray drying method; and 3, calcining the precursor powder B in an inert atmosphere, and crushing and grinding the obtained product to obtain the carbon-coated fluorine-doped Na2Fe2 (SO4) 3 positive electrode material. The F element with higher electronegativity than the S element is introduced, so that the overall electron distribution of the material is changed, the structural stability is improved, and the high-conductivity carbon protection layer is coated on the surface of the active material to form a conductive network, so that the resistance is reduced, the volume expansion is relieved, and the battery capacity and the cycling stability can be obviously improved.

The invention discloses a preparation method of a negative electrode material of a sodium ion battery, a negative electrode plate containing the negative electrode material and the sodium ion battery, and the negative electrode material is prepared by taking biomass waste semen cassiae as a carbon precursor and montmorillonite as a template and combining an in-situ fluorine ion exchange and carbonization process. The preparation method comprises the following steps: mixing semen cassiae with montmorillonite, removing a template, and carrying out fluorine ion exchange to obtain the fluorine-doped three-dimensional porous carbon composite material. According to the material, micro / mesopore distribution is regulated and controlled through a confinement effect between montmorillonite layers, uniform doping of fluorine elements is realized, and an electronic structure and a pore channel system are synergistically optimized. The composite material has rich sodium storage active sites, efficient ion / electron transmission paths and stable interface characteristics, can significantly improve the specific capacity, rate capability and cycle life of the sodium-ion battery, and has important application value in the field of sodium-ion battery negative electrode materials.

The invention provides a preparation process of an environment-friendly film coating, and belongs to the technical field of coatings, the preparation process comprises the following steps: S1, mixing 3-4 parts of epoxy resin, 25-28 parts of polyurethane emulsion, 35-38 parts of water-based acrylic resin emulsion, 0.5-1 part of a curing agent, 0.5-1 part of an accelerant, 2-2.5 parts of a dispersing agent, 0.3-0.5 part of a wetting agent and 6-8 parts of PVA emulsion to obtain a first mixture; s2, adding 4-5 parts of fluorine-doped hexagonal boron nitride and 10-12 parts of nano aluminum oxide into the first mixture, and stirring to obtain a second mixture; adding 2-3 parts of polyoxyethylene, 0.4-0.5 part of citric acid, 2-4 parts of a coalescing agent and 0.5-1 part of a defoaming agent into the second mixture, and stirring to obtain a coating; s3, performing plasma activation on the PET film to obtain a pretreated PET film; and S4, uniformly coating the pretreated PET film with the coating, and curing to obtain the environment-friendly film coating. The ink-jet adhesive force is improved, and meanwhile, the mechanical property of a PET film coated with a coating is improved.

The invention belongs to the technical field of lithium ion battery electrode materials, and particularly relates to a fluorine-doped long-circulation silicon-based negative electrode material as well as a preparation method and application thereof. The silicon-based material is doped and modified by using the fluoride, the doping and modification of the fluoride on the silicon-based particles are realized by using simple and convenient dry mixing and heat treatment means, F doping can be performed on the silicon-based particles by introducing the fluoride, and a high-strength solid electrolyte interface (SEI) rich in LiF is continuously formed in the expansion and pulverization process of the silicon-based particles. And meanwhile, the mass transfer rate is improved through bulk phase doping elements, uneven lithiation and stress concentration are reduced, and the cycling stability of the silicon-based composite negative electrode material is comprehensively improved. The preparation method disclosed by the invention is simple to operate, cheap in raw materials and easy for large-scale production, has a good application prospect in lithium ion battery negative electrode materials, and has a relatively high commercial value.

The invention provides a preparation method of a fluorine-doped tin oxide film. The preparation method comprises the following steps: placing a substrate in a deposition device; and carrying out at least one deposition treatment, wherein each deposition treatment independently comprises at least one tin oxide film sub-deposition treatment and at least one fluoride sub-deposition treatment. By changing the deposition treatment times, the tin oxide film sub-deposition times and the fluoride sub-deposition treatment times, the thickness of the fluorine-doped tin oxide film can be accurately regulated and controlled, the uniformity of the film is good, and the thickness difference is small.

The invention discloses a preparation method and application of a fluorine-doped and carbon-coated synergistically modified lithium-rich manganese-based single-crystal positive electrode material based on PVDF (polyvinylidene fluoride). The preparation method comprises the following steps: S1, preparing a transition metal salt solution, a NaOH aqueous solution and a NH3.H2O solution; s2, the transition metal salt solution, NaOH and NH3.H2O solutions are pumped into a reaction kettle at the same time, the pH value of the reaction is controlled and kept at 11.0-11.2, and a [NixMny] (OH) 2 precursor is obtained; s3, pre-sintering the [NixMny] (OH) 2 precursor at the temperature of 500 DEG C; and S4, mixing the sintered [NixMny] (OH) 2 precursor with PVDF and a lithium source according to a stoichiometric ratio, and carrying out secondary roasting in a nitrogen atmosphere to obtain the F-doped lithium-rich manganese-based polycrystalline positive electrode material with relatively loose combination. S5, the prepared lithium-rich manganese-based polycrystalline positive electrode material is crushed in an airflow crusher, and the lithium-rich manganese-based monocrystalline positive electrode material Li < 1.2 > Ni < x > Mn < y > O < 2-x > F < x > (at) C with both carbon coating and fluorine doping is obtained; the prepared Li < 1.2 > Ni < x > Mn < y > O < 2-x > F < x > (at) C is used for preparing a positive pole piece, and the positive pole piece is applied to a lithium ion battery.

The invention relates to a PEM ternary alloy catalyst for water electrolysis hydrogen production and a preparation method thereof, and belongs to the technical field of water electrolysis catalysts. 1-butyl-3-methylimidazolium tetrafluoroborate is introduced in the generation of a carrier manganese dioxide to increase the specific surface area of the carrier, fluorine doping and oxygen vacancy construction are realized on the surface of the carrier through hydrofluoric acid treatment, and then a metal precursor is dispersed through an ethylene glycol / water system; and finally, loading and alloying of the alloy nanoparticles are completed through hydrothermal reduction and heat treatment. The morphology and electronic structure of the carrier are synergistically regulated and controlled through ionic liquid and fluorine doping, the specific surface area and active sites are remarkably increased, strong interaction of metal and the carrier is achieved through ternary alloy component optimization, and the oxygen evolution reaction activity and stability of the catalyst and the precious metal utilization rate are effectively improved.

The invention belongs to the technical field of new energy batteries, and particularly relates to a fluorine-doped graphdiyne material and a preparation method and application thereof. The preparation method of the fluorine-doped graphdiyne material comprises the following steps: in a solvent system, mixing graphdiyne and a solid fluorine source, and drying to obtain a composite precursor; under the protective atmosphere, the composite precursor is annealed, so that the fluorine source is decomposed to release hydrogen fluoride and fluorine free radicals, the hydrogen fluoride or the fluorine free radicals are combined with carbon sites on graphdiyne through nucleophilic substitution, C-F bonds are formed, and the fluorine-doped graphdiyne material is obtained; the mass ratio of graphdiyne to the solid fluorine source is 30: (1-4). The fluorine-doped graphdiyne has the advantages that the defects are increased, the disorder is reduced, and the lithium storage capacity of the graphdiyne is improved, so that the long-term cycle performance and the high-rate performance are improved.

A method of bonding substrates comprises depositing a fluorine-doped dielectric layer on a first substrate, exposing the fluorine-doped dielectric layer to a hydrogen-containing plasma, and directly bonding the fluorine-doped dielectric layer to a surface of a second substrate without the use of an intervening adhesive.

The present invention relates to a sulfide-based solid electrolyte having excellent moisture stability and ionic conductivity, a method for preparing the same, and an all-solid-state battery comprising the same, and provides a solid electrolyte, a method for preparing the same, and an all-solid-state battery comprising the same, the solid electrolyte includes: a core portion including sulfide-based solid electrolyte particles; and a surface portion formed on the core portion and including fluorine-doped sulfide-based solid electrolyte particles, in which the surface portion includes a concentration gradient region in which a concentration of fluorine (F) atoms decreases in a direction from a surface of the surface portion toward the core portion.

The invention provides a fluorine-doped Fe-N-C composite material as well as a preparation method, application and regeneration thereof, and belongs to the technical field of water pollution. The preparation method comprises the following steps: firstly, mixing an iron precursor, zinc salt, an organic ligand and an organic solvent to synthesize a Fe-doped metal organic framework Fe (at) ZIF-8 material, and then carbonizing the Fe-doped metal organic framework Fe (at) ZIF-8 material into a Fe-N-C material; and then Fe-N-C and a fluorine source are mixed and subjected to secondary carbonization, and the fluorine-doped Fe-N-C composite material is obtained. Fluorine atoms are introduced into the Fe-N-C material and generate axial coordination with Fe in the center of FeN4, the fluorine element with high electronegativity can effectively improve the isoelectric point of the Fe-N-C material, the reaction activity of the material is enhanced, Fe leaching of the material in the reaction process is inhibited, and the stability of the material is improved. In addition, the prepared fluorine-doped Fe-N-C composite material can continue to be recycled through fluorine doping regeneration, and high reduction activity and stability are kept.

The invention belongs to the technical field of solid electrolytes, and relates to a fluorine-doped sulfide solid electrolyte with high ionic conductivity and stability, and a preparation method and application thereof. The fluorine-doped sulfide solid electrolyte has a chemical formula as shown in a formula I or a formula II: Li < 10-2x > Ge < 1-x > Sn < x > P2S < 12-2x > F < 2x > formula I, and x is more than 0 and less than 1; li < 6 + / -3y > P < 1-y > Sn < y > S5Cl < 1-2y > F < 2y > formula II, and y is more than 0 and less than 1. A fluorine source for preparing the fluorine-doped sulfide solid electrolyte is SnF2. According to the sulfide solid electrolyte and the preparation method thereof, SnF2 is taken as a fluorine source, fluorine is introduced, the prepared sulfide solid electrolyte has wet air stability and lithium metal stability while high ionic conductivity is guaranteed, and an assembled all-solid-state battery shows excellent cycling stability.

The invention relates to the field of ceramic glaze materials, and provides a high-acid-resistance ceramic glaze material and a preparation method thereof.The glaze is composed of boron nitride nanosheets, fluorine-doped titanium oxide, calcium fluoride, kaolinite, feldspar, aluminum oxide, zirconium oxide, silicon carbide, sodium fluosilicate, borax, kaolin, calcium phosphate, polymethyl methacrylate balls, ammonium polyacrylate and deionized water. A lotus-leaf-like micro-convex structure is formed on the surface of the glaze layer, the convex gap is 2.5-5.0 microns, the height is 0.8-1.2 microns, and the diameter is 1.1-2.5 microns, so that the acid resistance and the super-hydrophobic property are improved. The preparation method comprises the following steps: step-by-step ball milling of a hard phase and a soft phase, high-energy ball milling assisted stripping of boron nitride, ultrasonic dispersion, template introduction, freeze drying, gradient pyrolysis under nitrogen protection, sintering at 1150-1200 DEG C, sodium fluosilicate surface fluorination treatment and the like. The stability of TiO2 is optimized through fluorine doping, the acid resistance and crack resistance are enhanced through boron nitride, and the self-cleaning property is improved through a nano structure.

The invention discloses carbon-coated lithium manganese iron phosphate as well as a preparation method and application thereof, and belongs to the technical field of battery positive electrode materials. A preparation method of carbon-coated lithium manganese iron phosphate comprises the following steps: S1, mixing and dispersing a manganese source, an iron source, a lithium source, a phosphorus source and a carbon source, grinding, spray-drying and sintering to prepare carbon-coated lithium manganese iron phosphate; and S2, ammonium fluoride and the carbon-coated lithium manganese iron phosphate obtained in the step S1 are sequentially subjected to low-temperature fluorination sintering treatment and high-temperature defluorination sintering treatment. According to the preparation method, the carbon coating layer is modified through fluorine doping subjected to low-temperature fluorination sintering treatment in the step S2, so that the electronic structure distribution and the conductivity of the material are regulated and controlled, and the doped fluorine atoms leave the system in a fluorine gas form through fluorine-doped defluorination sintering treatment at a high temperature; and then proper sintering is performed to accelerate polymerization and heal excessive defect sites, so that the specific surface area of the material is reduced, and controllable adjustment of the specific surface area of the material is realized.

The invention discloses a preparation method and application of a fluorine-doped carbon material, and relates to a preparation method and application of a carbon material. The method comprises the following steps: 1, preparing a sodium fluoride solution; 2, dropwise adding perchloric acid into the sodium fluoride solution to obtain a mixed solution; 3, adding a carbon material into the mixed solution; and 4, carrying out hydrothermal reaction to obtain the fluorine-doped carbon material. By optimizing the preparation process of the fluorine-doped carbon material, the compactness and uniformity of the protective layer are realized, the corrosion resistance and cycling stability of the zinc negative electrode are remarkably improved, and an important technical support is provided for large-scale application of the water-based zinc ion battery. The prepared zinc negative electrode with the fluorine-doped carbon coating on the surface is used as a negative electrode of an aqueous zinc ion battery. The fluorine-doped carbon material prepared by the invention can effectively improve the corrosion resistance and cycling stability of the zinc negative electrode, and provides technical support for large-scale application of the water-based zinc ion battery.

The application discloses a kind of detection pesticide water amitraz integrated organic photoelectrochemical transistor sensor construction method.The application is integrated on the same fluorine-doped tin oxide conductive glass chip by laser etching technology to have the gate, source, drain three electrodes of organic photoelectrochemical transistor.In order to improve the activity and stability of grating material, the method of encapsulating Pd NPs in Cu-MOF and pyrolyzing is adopted, and Pd NPs / p-Cu-MOF is formed.Pyrolysis Cu-MOF with three-dimensional MOF structure as active carrier can load more Pd NPs, and the redox active copper metal elements contained therein will cause electron transfer between carrier and Pd NPs, so as to adjust the electronic state of metal active site and improve its catalytic performance.Schottky junction is formed between Pd NPs and p-Cu-MOF, which promotes the separation of electrons and holes.Pd NPs / p-Cu-MOF is used as photoactive gate material, and amino amitraz aptamer with carboxyl on the material is used as recognition element, so as to realize the OPECT sensing detection of ICP.

The present invention relates to the technical field of electrochromic thin film materials, and provides a rutile-phase TiO2 nanorod / fluorine-doped anatase-phase TiO2 nanosheet composite material, a preparation method and an application thereof. The composite material of the present invention is composed of an FTO conductive glass substrate and rutile-phase TiO2 nanorods and fluorine-doped anatase-phase TiO2 nanosheets that are sequentially grown on one side of the FTO conductive glass substrate. It is prepared by hydrothermal method to induce the growth of one-dimensional single-crystal rutile-phase TiO2 nanorods on the surface of a pretreated FTO conductive glass substrate in precursor solution A, and then the solvothermal method is used to induce the in-situ epitaxial growth of anatase-phase TiO2 nanosheets on the one-dimensional single-crystal rutile-phase TiO2 nanorods in precursor solution B, and the surface of the anatase-phase TiO2 nanosheets is fluorinated with a NaF solution. The present invention can improve the cycle stability of the composite material and the electron transfer efficiency between the conductive substrate and the TiO2 nanosheets, and achieve independent and selective optical transmittance modulation of visible light and near-infrared light.

The invention relates to the technical field of lithium batteries, in particular to a preparation method of a high-first-efficiency and high-conductivity silicon monoxide negative pole piece, which comprises the following steps: 1, improving the conductivity of silicon monoxide powder in a fluorine-doped carbon coating manner, and enhancing the structural stability of an SEI film formed by the first charge and discharge of the silicon monoxide negative pole piece; 2, through a powder pre-lithiation mode, the lithium content of the silicon monoxide powder is improved, and the initial coulombic efficiency of the silicon monoxide negative electrode plate is enhanced; 3, by introducing a polymer binder containing a conjugated structure, the ion / electron conductivity of the silicon monoxide negative electrode plate is improved, the resistance of the negative electrode plate is reduced, and the volume expansion of silicon monoxide particles in the lithium intercalation and deintercalation process is buffered; and 4, mixing the powder prepared in the step 2 with the conductive polymer binder prepared in the step 3 to obtain the silicon monoxide negative pole piece. The negative pole piece prepared by the preparation method disclosed by the invention has relatively high first coulombic efficiency, relatively high conductivity and relatively high rate capability.

Provided is a catalyst for an oxygen evolution reaction in a water electrolysis cell, the catalyst comprising: water electrolysis catalyst particles containing a noble metal oxide; and a conductive additive containing a fluorine-doped metal oxide, wherein in the entire fluorine-doped metal oxide, the content of fluorine is 1 at% to 10 at% relative to a total of 100 at% of the components as measured by X-ray photoelectron spectroscopy (XPS).

The invention provides a lithium ion battery positive electrode material with high interface conductivity and a preparation method thereof, and belongs to the technical field of new energy battery electrode materials. The preparation method of the lithium ion battery positive electrode material comprises the following steps: under the protection of nitrogen, reacting a metal salt solution containing nickel, cobalt and manganese with a precipitator and a complexing agent to synthesize a compact spherical NCM precursor; the preparation method comprises the following steps: uniformly ball-milling NCM, LiOH.H2O, LiF and absolute ethyl alcohol, and carrying out densification sintering to obtain fluorine-doped NCM powder; the preparation method comprises the following steps: mixing LiNO3, NH4H2PO4, urea and deionized water to prepare a precursor solution, uniformly loading the precursor solution on fluorine-doped NCM powder by adopting a rotary evaporation method, and carrying out heat treatment to obtain a lithium phosphorus oxygen nitrogen glass phase coated fluorine-doped NCM composite material; and dispersing the carboxylated multi-walled carbon nanotubes in absolute ethyl alcohol, adding the LiPON coated fluorine-doped NCM composite material and phenolic resin, and carbonizing to obtain the positive electrode material. The obtained lithium ion battery positive electrode material has high interface conductivity, and the long cycle life is remarkably prolonged.

The invention discloses a fluorine-doped alpha-type manganese dioxide nanotube, a preparation method thereof and application of the fluorine-doped alpha-type manganese dioxide nanotube as a thallium adsorption material, and belongs to the technical field of thallium wastewater treatment. A manganese source solution, a fluorine source solution and an inorganic acid are mixed and then subjected to a hydrothermal reaction, and the fluorine-doped alpha-phase manganese dioxide nanotube is obtained, has the advantages of being large in specific surface area, developed in pore structure, rich in surface active sites and the like, can be used as a thallium adsorption material for repairing thallium-polluted water, can quickly, efficiently and selectively remove thallium ions in wastewater, and has a good application prospect. And the purpose of water purification is achieved.

The invention provides a light emitting diode and a preparation method thereof. The light-emitting diode comprises an epitaxial structure and a transparent conductive layer, the transparent conductive layer is arranged on the surface of the epitaxial structure, the transparent conductive layer comprises a first transparent conductive sub-layer, a second transparent conductive sub-layer and a third transparent conductive sub-layer which are sequentially stacked on the epitaxial structure, the first transparent conductive sub-layer is an ITO layer, the second transparent conductive sub-layer is a hydrogen and fluorine doped indium oxide layer, and the third transparent conductive sub-layer is an ITO layer. According to the double-ITO transparent conductive layer, the production cost is reduced, and good light transmission and conductivity are provided.

The application provides a fluorine-doped Fe-N-C composite material and a preparation method and application and regeneration thereof, and belongs to the technical field of water pollution. In the application, an iron precursor, a zinc salt, an organic ligand and an organic solvent are mixed to synthesize Fe-doped metal organic framework Fe@ZIF-8 material, and then the Fe@ZIF-8 material is carbonized into Fe-N-C material; then the Fe-N-C material is mixed with a fluorine source and subjected to secondary carbonization to obtain the fluorine-doped Fe-N-C composite material. In the application, fluorine atoms are introduced into the Fe-N-C material to produce axial coordination with Fe of the FeN4 center, the fluorine element with high electronegativity can effectively improve the isoelectric point of the Fe-N-C material, the reaction activity of the material is enhanced, the Fe leaching of the material in the reaction process is inhibited, and the stability of the material is improved. In addition, the prepared fluorine-doped Fe-N-C composite material can be reused through fluorine-doping regeneration, and high reduction activity and stability can be maintained.

The invention discloses a fluorine-containing high polymer carbonized and coated silicon-carbon negative electrode material and a preparation method thereof. The silicon-carbon negative electrode material comprises a silicon-carbon material serving as a core and a coating layer serving as a shell and coating the surface of the silicon-carbon material, wherein the coating layer is formed by carbonizing a fluorine-containing high polymer layer; the fluorine-containing high polymer layer is obtained by coating the surface of the silicon-carbon material with a fluorine-containing micromolecular monomer through in-situ polymerization, or obtained by directly coating the surface of the silicon-carbon material with a fluorine-containing high-molecular polymer, or obtained by coating the surface of the silicon-carbon material with the fluorine-containing micromolecular monomer and a copolymer monomer through in-situ copolymerization. According to the fluorine-containing high polymer carbonized and coated silicon-carbon negative electrode material provided by the invention, the surface of the silicon-carbon material is secondarily coated with the fluorine-doped carbon layer (coating layer), so that the problem that the existing secondarily coated carbon layer can hinder ion transmission of the silicon-carbon material and influence the rate capability can be solved.