509results about How to "Reduce chance of recombination" patented technology

The invention relates to a preparation method of a solar light splitting water hydrogen production catalyst without noble metal as a cocatalyst. Specifically, graphene is used as a cocatalyst to prepare semiconductor nanoparticle-graphene composite photocatalysts, including CdS-graphene composites and TiO2-graphene composites. The hydrogen production efficiency of the photocatalyst with graphene as the cocatalyst is comparable to or even higher than that of the photocatalyst containing the same mass of noble metal Pt under the same hydrogen production conditions. Graphene materials have good electron aggregation and transport functions, which promote the effective separation of electrons and holes, reduce the probability of proton recombination, and increase the photocatalytic efficiency of photocatalysts and the efficiency of photo-splitting water to produce hydrogen; and the preparation method of graphene materials is simple , cheaper than precious metals, and has no pollution to the environment, which is conducive to large-scale preparation and production. The preparation of photocatalysts using graphene as a cocatalyst has opened up a new method for reducing the cost of hydrogen production from solar energy and improving the efficiency of hydrogen production by photolysis of water.

The invention provides a composite fiber material applied to visible light photocatalytic purification of sewage and air pollutants and a preparation method thereof. The composite fiber material is synthesized by loading a visible light response type bismuth-based photocatalytic material on a textile fiber material through a green chemical synthetic route. A powdered photocatalyst is solidly loaded by the unique net-like felt structure of the textile fiber material, so that the catalyst is prevented from losing and agglomerating during sewage treatment and air purification, and the separability and reusability are improved.

The invention discloses a solar cell and a solar cell module group. The solar cell comprises a substrate, a positive electrode, and a back electrode. The substrate comprises a light-receiving surface where the positive electrode is arranged, a back surface where the back electrode is arranged, and an emitter electrode layer which is located on the light-receiving surface and is provided with a heavily doped region and a light doped region. The positive electrode comprises a first convergence electrode, a second convergence electrode, and a plurality of finger-shaped electrodes. The heavily doped region is provided with a first heavily doped part and a second heavily doped part, which are located between the first convergence electrode and the second convergence electrode. The solar cell can improve the collection efficiency of charge carriers, and reduces the recombination probability of charge carriers, thereby improving the collection efficiency of current, and improving the photoelectric conversion efficiency and open-circuit voltage of the solar cell.

The present invention belongs to the field of garbage treatment technology, in particular, it relates to a medical garbage rotary kiln incineration equipment system. Said equipment mainly is composed of incineration system, flue gas cleaning system, induced draft system and monitoring system. The incineration system mainly includes wastes-conveying device, rotary kiln, secondary combustion chamber, combustion device and dirt-excluding device. The described flue gas cleaning system mainly includes flue gas cleaning tower, precipitation tank and active carbon absorber. Besides, said invention also provides the concrete structure of rotary kiln, secondary combustion chamber and flue gas cleaning tower.

The invention discloses a method for preparing a ZnO/Cu2O heterojunction material and a ZnO/Cu2O three-dimensional structure heterojunction solar cell. The preparation method of the heterojunction material includes growing an n-type ZnO nanorod array on a substrate by a liquid phase growth method Thin film, with alkaline copper salt solution as the electrolyte, deposited at a deposition potential of -0.4~-0.6V for 60-150s, and electrochemically deposited p-type Cu2O on the surface of ZnO nanorods to form a Cu2O seed layer; with alkaline copper The salt solution is the deposition solution. Under the deposition potential of -0.05 ~ -0.3V, the Cu2O is fully filled into the gaps of the nanorod array from bottom to top by the electrochemical deposition method again to form a ZnO/Cu2O three-dimensional structure heterojunction material. The filling depth and density of the Cu2O semiconductor thin film of the invention are increased, interface defects are reduced, and the efficiency of the prepared heterojunction battery is high.

The invention discloses a method for preparing a thin-film solar photovoltaic cell with a copper indium gallium selenide (CIGS) nano wire array structure. The method comprises the following steps of: growing a large-area cuprous sulfide or copper sulfide nano wire array by adopting a gas-solid reaction method, and converting the cuprous sulfide or copper sulfide nano wire array into a CIGS nano wire array by physical vapor deposition and heat treatment methods. The component, the phase structure and the energy band structure of the semiconductor nano wire array can be regulated by controlling the categories of deposition elements, the deposition sequence, the deposition process, post treatment and the like, so that solar photovoltaic cells with different structures and properties are prepared. Through the cell, light reflection is reduced, light absorption is increased, the probability of producing current carriers can be increased, the probability of recombination of holes and electrons is reduced, and the photoelectric conversion efficiency is greatly improved. The method is low in cost, the preparation processes are controllable, the prepared nano wire array is uniform in structure distribution, and preparation of the nano structural thin-film solar photovoltaic cell with large area and high photoelectric conversion efficiency can be realized.

The invention discloses a black phosphorus/graphene heterostructure-based ultraviolet detector and a production method thereof. The detector comprises a substrate, an insulating layer and a black phosphorus/graphene heterostructure, wherein the insulating layer covers the substrate; and the black phosphorus/graphene heterostructure is formed by stacking black phosphorus and graphene and is located on the insulating layer. The disadvantages of the black phosphorus are compensated by the black phosphorus/graphene heterostructure; and the performance of the detector can be improved under the premise of not affecting the advantages of the black phosphorus.

The invention discloses a solar battery with a graphite interface layer and a manufacturing method thereof. The solar battery comprises conducting glass, a thin oxide film, an electrolyte and a pair of electrodes, wherein the graphite interface layer is arranged between the conducting glass and the thin oxide film. A graphite oxide suspension is sprayed to the conducting glass, and the graphite oxide sprayed to the conducting glass is reduced to graphite at high temperature in a reducing or inert atmosphere. By using high conductivity and an appropriate energy band structure of graphite, the graphite interface layer is introduced between the conducting glass and the thin oxide film, so that the electrolyte can be effectively prevented from touching the conducting glass, the compounding possibility between photogenerated electrons and the electrolyte is reduced, the back reaction process is inhibited, and the photoelectric properties of the battery are improved.

The invention belongs to the technical field of photocatalysts for degrading organic sewage, and specifically relates to a method for preparing a carbon nitride/ titanium dioxide heterojunction photocatalyst in one-step electrostatic spinning way. The heterojunction photocatalyst is prepared in the one-step electrostatic spinning way, wherein the one-step electrostatic spinning way specifically comprises the following steps: adding melamine or guanidine hydrochloride or urea to a mixed solution containing glacial acetic acid, tetrabutyl titanate, polyvinylpyrrolidone and an organic solvent; then performing the electrostatic spinning technology and the high-temperature sintering treatment to obtain the carbon nitride/ titanium dioxide heterojunction photocatalyst. The prepared photocatalyst is outstanding in heterojunction and outstanding in performance of photocatalyzing degrading the organic sewage; the preparation technology of the carbon nitride/ titanium dioxide heterojunction photocatalyst is simplified; the technology is simple; the time is saved. Therefore, the method has a good application prospect in organic sewage treatment.

The invention discloses a preparation method of zinc oxide/polyaniline composite photocatalyst. The preparation method of the zinc oxide/polyaniline composite photocatalyst comprises the following steps of: respectively preparing nanometer zinc oxide by adopting a direct precipitation method and a hydrothermal method; chemically modifying the surface of the obtained nanometer zinc oxide by silane coupling agent; and compounding the surface-modified nanometer zinc oxide with polyaniline (PANI) to obtain nanometer zinc oxide/polyaniline composite photocatalyst of different morphologies through an emulsion polymerization method. The preparation method disclosed by the invention is simple to operate; the prepared composite photocatalyst has high stability and longer service life for cyclic utilization; moreover, the photocatalytic activity and efficiency of the composite material are improved, the absorption and utilization of zinc oxide to the visible light are strengthened, the utilization rate of the photocatalyst to the sunshine is greatly improved, and the visible light catalytic degradation efficiency is higher, so that the nanometer zinc oxide photocatalyst has an extensive application prospect in organic substance wastewater treatment.

The invention discloses a MoSe ₂ Nanosheet Composite Firework-like TiO ₂ Nanorod arrays, which include TiO ₂ Nanorod arrays and MoSe ₂ nanosheets; the MoSe ₂ nanosheets are uniformly and massively distributed in the TiO ₂ The surface of the nanorod array has good recombination on the array surface; the TiO ₂ Nanorod arrays are made of TiO ₂ self-assembled nanorods. The present invention also discloses that the MoSe ₂ Nanosheet Composite Firework-like TiO ₂ Fabrication of nanorod arrays using a two-step solvothermal method to make MoSe ₂ Nanosheets uniformly grown on fireworks-like TiO ₂ On the nanorod array, a material with good composite morphology is obtained. The prepared semiconductor material has increased spectral absorption range and specific surface area, reduced carrier recombination probability, good photocatalytic degradation performance, and has great application potential in the field of photocatalytic degradation. The preparation method of the invention has the advantages of simple operation, high yield, low preparation cost and the like.

The invention relates to a tetrapod-like zinc oxide/graphene composite material and a preparation method thereof. The composite material is formed by growing a graphene nano sheet on the surface of tetrapod-like zinc oxide and belongs to the fields of novel micro-nano material and material preparation. The method comprises the following steps of step1, preparing reaction precursor liquor containing zinc nitrate or zinc acetate and oxidized graphene, wherein the pH value is 8 to 13; step 2, carrying out hydrothermal reaction of the precursor liquor prepared in step 1 at the temperature of 100 to 200 DEG C to prepare a reaction midbody; and step 3, calcining the midbody obtained in the step 2 in an environment of 200 to 680 DEG C while controlling the heating rate at 3 to 8 DEG C per minute to obtain the tetrapod-like zinc oxide/ graphene composite material. By adopting the tetrapod-like zinc oxide/graphene composite material and the preparation method thereof, the defect of existing tetrapod-like zinc oxide that the catalyzing efficiency is low and the clustering problem of the oxidized graphene in the reduction process can be solved. The tetrapod-like zinc oxide/graphene composite material is expected to be popularized in the fields such as heat conduction, piezoelectricity, voltage-sensitive, wave absorption, sound absorption, vibration absorption, antibiosis, anti-weeds, catalysis and the like.

The invention relates to the optical detector of a Van der Waals heterojunction based on two-dimensional indium selenide and black phosphorus and manufacturing thereof. The optical detector comprisesa silicon substrate and a silicon dioxide oxide layer arranged on the silicon substrate. A p-type black phosphorus layer is arranged on the silicon dioxide oxide layer. An n-type indium selenide layeris arranged on the p-type black phosphorus layer. The p-type black phosphorus layer and the n-type indium selenide layer form a Van der Waals p-n heterojunction. A drain electrode is arranged on then-type indium selenide layer. A source electrode is arranged on the p-type black phosphorus layer. One surface of the silicon substrate, which is opposite to the silicon dioxide oxide layer, is provided with a gate electrode. In the invention, n-type indium selenide and p-type black phosphorus form the p-n heterojunction; through a built-in electric field at an interface, the rapid separating of electrons and hole carriers can be realized; a carrier composite probability is reduced and then the dark current of a device is deceased; and a detector noise can be reduced and a response speed is increased.

The invention discloses a bismuth tungstate composite photocatalyst modified by a nitrogen-doped carbon quantum dot and a preparation method and application thereof. The composite photocatalyst is characterized in that bismuth tungstate is taken as a carrier, and is modified with the nitrogen-doped carbon quantum dot. The preparation method comprises the following steps: mixing bismuth nitrate, sodium tungstate and water, and stirring the mixture to obtain a bismuth tungstate precursor solution; mixing the bismuth tungstate precursor solution with a nitrogen-doped carbon quantum dot solution, and stirring the mixture to obtain a mixed solution; performing a hydrothermal reaction to obtain the bismuth tungstate composite photocatalyst. The composite photocatalyst has the advantages of environmental friendliness, high photo-induced electron-hole separating efficiency, high light absorbing efficiency, high photocatalysis activity, high photocatalysis stability and high corrosion resistance; the preparation method has the advantages of simple preparation process, low raw material cost, and easiness in controlling operation conditions. The composite photocatalyst is used for catalyzing degradation of antibiotic wastewater, and has the advantages of simple application method, high degrading efficiency and high repeatability, and has a very good practical application prospect.

The invention belongs to the field of thermophotovoltaic technology, in particular to a high conversion efficiency heterojunction thermophotovoltaic cell based on the Ga[x]In[1-x]As[1-y]Sb[y] quarternary semiconductor matched with crystal lattices. The heterojunction thermophotovoltaic cell sequentially comprises a back electrode, an N type substrate, an N type wide bandgap Ga[x1]In[1-x1]As[1-y1]Sb[y1] active layer, a lightly doped P<-> type narrow bandgap Ga[x2]In[1-x2]As[1-y2]Sb[y2] active layer, a heavily doped P<+> type wide bandgap Ga[x3]In[1-x3]As[1-y3]Sb[y3] limiting layer and an upper electrode in the shape of a grizzly bar from top to bottom. Furthermore, a P type GaSb window passivating layer is additionally arranged between the P<+> type wide bandgap limiting layer and the upper electrode in the shape of the grizzly bar, and an N type GaSb back limiting layer is additionally arranged between the N type substrate and the N type wide bandgap active layer. The heterojunction thermophotovoltaic cell which is used for low temperature radiator thermophotovoltaic systems has the advantages of good stability and high safety coefficient, and can be applied to the fields of spaceflight, military affairs, industry, life, and the like.

The invention relates to a novel method for preparing compound high-activity photocatalyst, which belongs to the field of novel material preparation. The method is characterized in: 1) a mechanical chemical method (ball milling method) adopted for preparation; 2) photocatalyst, namely the catalyst capable of showing activity only under the irradiation of ultraviolet light or visible light; 3) multi-component property, namely the capability of forming compound-component multi-junction coupled photocatalyst; and 4) high activity, namely the activity of the prepared photocatalyst is improved to a great extent compared with that of photocatalysts prepared by other methods. The method has the characteristics of easy control, mild reaction conditions, simple post-treatment, convenience for large-scale production, easy operation and the like. The photocatalyst prepared by the method has average grain size between 30 and 50 nm, high photocatalytic activity and good reproducibility.

The invention relates to a nanorod alpha-ferric oxide composite MIL-101 heterojunction photo-anode and a preparation method thereof. According to the technical scheme, the preparation method comprisesthe following steps: dissolving 0.6-0.9 part by mass of ferric trichloride hexahydrate and 0.1-0.4 part by mass of urea into 50 parts by mass of deionized water, and performing stirring so as to obtain a precursor solution of alpha-ferric oxide; putting conductive glass of which the conductive surface faces to an inner wall into a reaction kettle, further transferring the precursor solution of alpha-ferric oxide into the reaction kettle, performing a hydrothermal reaction, performing washing, and performing drying; putting a hydroxyl iron oxide nanorod array obtained after drying into a crucible, respectively keeping temperatures at 400-700 DEG C and 500-800 DEG C respectively so as to obtain a Fe2O3 nanorod array, finally putting the Fe2O3 nanorod array and terephthalic acid into the tail end and the middle end of a tubular furnace in sequence, and performing chemical vapor deposition in the presence of argon at 200-800 DEG C, so as to obtain the nanorod alpha-ferric oxide compositeMIL-101 heterojunction photo-anode. The preparation method is simple in process and good in operability, and the obtained product has good photoelectric catalytic water oxidation performance.

The invention discloses a ternary nanocomposite Au/RGO-TiO2 nanotube array as well as a preparation method and application thereof. A graphene film and nano gold particles are modified on the surface of a titanium dioxide nanotube array; and the nano gold particles are also modified and distributed on the inner pipe wall and the outer pipe wall of the titanium dioxide nanotube array. By the ternary nanocomposite Au/RGO-TiO2 nanotube array as well as the preparation method and the application thereof, the adsorption capability and the electron conduction capability of the titanium dioxide nanotube array are further enhanced, the absorption range of a visible light zone is widened, and the photoelectric conversion efficiency is improved.

The invention relates to a composite photocatalyst membrane material with a hierarchical pore structure and a preparation method thereof. A basal body of the composite photocatalyst membrane material is a transition a metal-doped hierarchical porous TiO2 and ZnO compound semiconductor membrane material membrane. The preparation method comprises the following steps: firstly preparing a TiO2 and ZnO compound photocatalyst precursor containing pore-forming agents P123, F127, PMMA (Polymethyl Methacrylate), PEG (Polyethylene Glycol), CTAB (Cetylt Trimethyl Ammonium Bromide) and transition metal Fe, Ni. Co, Mo, Cu, Pt, Au, Pd and Ag; then assembling the transition metal-modified ZnO/TiO2 hierarchical porous composite photocatalyst membrane material on FTO (Fluorinedoped Tin Oxide), ITO (Indium Tin Oxide) and Ni sheets and other carriers through a spray pyrolysis method, a dip-coating method, a spin-coating method, a silk-screen printing method, a doctor blade method and other coating methods; and finally, directly carrying out in-situ growth on a carbon nano tube on the composite photocatalyst membrane material through a chemical vapor deposition method. The hierarchical porous composite photocatalyst membrane material has the advantages of high photocatalytic activity, stable membrane binding, simple preparation process and easiness in industrialization realization.

The invention discloses a photocatalytic membrane, a preparation method thereof and degradation application of the photocatalytic membrane on a disinfection by-product precursor. The preparation method of the photocatalytic membrane comprises the following steps that molybdenum disulfide (MoS2) and graphene oxide (GO) are compounded to prepare a MoS2/RGO (reduced graphene oxide) compound; a polyvinylidene fluoride ultrafiltration membrane is provided and immersed in a Tris-dopamine hydrochloride solution to obtain a polydopamine loaded polyvinylidene fluoride ultrafiltration membrane; then theMoS2/RGO compound is dissolved in water and subjected to ultrasonic treatment, an aqueous solution of the MoS2/RGO compound is subjected to vacuum suction filtration on the polydopamine loaded polyvinylidene fluoride ultrafiltration membrane, and then vacuum drying is carried out to prepare the photocatalytic membrane. The preparation method of the photocatalytic membrane and the prepared photocatalytic membrane can be used for efficiently degrading the disinfection by-product precursor in a visible light area.