363results about How to "Avoid recombination" patented technology

The invention relates to a method for preparing graphene compounds and graphene oxide compounds with high efficiency, relating to the method for preparing the graphene compounds and the graphene oxide compounds. The invention solves the problems of easy composition of graphene or graphene oxide per se and many process steps, higher cost and difficult dispersedness for preparing the graphene compounds and the graphene oxide compounds by the traditional method at the same time. The invention adopts a mechanical stripping method to obtain the graphene compounds and the graphene oxide compounds. In the invention, an automatic machine is utilized, solid particles are used for assisting stripping, the contact area and the stripping number of the stripping process are greatly increased, and carbon material powder experiences a lot of stripping processes through the action of shear and impact, thereby obviously improving the stripping efficiency and achieving the purpose of uniform dispersedness to the composites. The method is suitable for industrial mass production of the graphene compounds and the graphene oxide compounds.

A deposition system for performing chemical vapor deposition comprising deposition chamber and a vaporizer coupled to said chamber. In one aspect, the vaporizer has a relatively short mixing passageway to mix a carrier gas with a liquid precursor to produce a fine aerosol-like dispersion of liquid precursor which is vaporized by a hot plate.

The invention relates to the technical field of nonmetallic mineral finish machining and inorganic processing, in particular to an attapulgite / graphite phase carbon nitride composite material. The attapulgite / graphite phase carbon nitride composite material takes attapulgite as a carrier and takes graphite phase carbon nitride as an active ingredient; the mass ratio of the attapulgite to the graphite phase carbon nitride is 1: 1 to 1: 10. By compounding the graphite phase carbon nitride with the attapulgite, the foreign ions in the attapulgite enter the crystal lattices of the graphite phase carbon nitride to increase the defects and change the energy level; the silicon oxide in the attapulgite can possibly form a heterojunction structure with the graphite phase carbon nitride so as to promote the transfer of photo-generated electrons and avoid the self-compounding of the photo-generated electrons; through the concerted catalysis action between the carrier and the active ingredient, the catalytic activity of the composite material is strengthened to a great extent.

Photovoltaic nanocomposite and solar cell device including the photovoltaic nanocomposite, where the photovoltaic nanocomposite includes a film of solution processed semiconductor materials having an n-type material selected from n-type quantum dots and n-type nanocrystals, and a p-type material selected from p-type quantum dots and p-type nanocrystals, and where the n-type material has a conduction band level at least equal, compared to vacuum level, to that of the p-type material, the p-type material has a valence band at the most equal, compared to vacuum level, to that of the n-type material. at least a portion of the n-type material and at least a portion of the p-type material are present in a bulk nano-heterojunction binary nanocomposite layer having a blend of the n-type material and the p-type material.

The invention discloses a metallic oxide / metal sulfide core-shell heterojunction hollow nanosphere. The inner layer of the spherical shell is a metallic oxide polycrystalline layer; the outer layer of the spherical shell is a metal sulfide polycrystalline layer; a heterojunction is formed between the metallic oxide polycrystalline layer and the metal sulfide polycrystalline layer; the thickness of each layer is 10 nanometers or below; and the diameter of the hollow sphere is 100-600 nanometers. The preparation method comprises the following steps: utilizing a template adsorption method, performing stepped adsorption and subsequent hydrothermal sulfuration, thereby preparing the metallic oxide / metal sulfide core-shell heterojunction hollow nanosphere. The metallic oxide / metal sulfide core-shell heterojunction hollow nanosphere disclosed by the invention is regular in structure, the thickness of the spherical shell is controllable, the grain size of the metallic oxide and metal sulfide is 10nm or below, the crystal quality is high, and the specific surface area is larger than 200m<2> / g. The method disclosed by the invention is simple and low in cost, has extremely wide range on selection of types of metallic oxides and selection of metal sulfides and contributes to industrialized application.

The invention discloses a pixel unit and a manufacturing method therefor and a display apparatus. The pixel unit comprises a pixel defining layer, a first electrode, an organic layer and a second electrode, wherein a pixel region is limited by the pixel defining layer; the organic layer is formed in the pixel region, and positioned on the first electrode; and the second electrode is formed on the organic layer, wherein at least one groove is formed in the pixel defining layer. By forming the groove in the pixel defining layer, the organic layer of the adjacent pixel units can be blocked; when the organic layer is evaporated, the organic layer is blocked in the groove without being covered with a step easily, namely, without causing a climbing effect easily; and therefore, movement of current carriers on the first electrode to a non-pixel region can be avoided, thereby avoiding recombination of positive charges and electrons in the non-pixel region.

The invention discloses a preparation method of array magnetic reduced graphene oxide-carbon nanofiber. The method comprises the following steps: taking flake graphite as a raw material, and preparinggraphene oxide with a Hummer method, so as to obtain the graphene oxide; preparing the graphene oxide and magnetic material precursor into magnetic material modified graphene oxide with a hydrothermal / solvothermal method, preparing the magnetic material modified graphene oxide, polymer and a solvent into a magnetic graphene oxide-polymer mixed electrostatic spinning precursor solution, preparingmagnetic graphene oxide-polymer compounded electrostatic spinning fiber, and performing heat treatment, so as to obtain a magnetic graphene oxide carbon nanofiber composite material. The method has the advantages that an RGO surface loaded nano metal oxide particle has a pseudocapacitor characteristic, can improve the charge energy storage density of the composite material, and is suitable for high-capacity power supercapacitors, with the specific capacitance being 240.3CP / F*g<-1>-254.1CP / F*g<-1> and the charge discharge efficiency being 99.1% to 99.6%.

The invention relates to a silver phosphate / titanium dioxide composite material for photochemical catalysis and a preparation method thereof. The preparation method comprises the following steps of (1) preparing titanium dioxide; (2) dissolving a certain amount of dihydric phosphate into deionized water to prepare a solution with the concentration of 0.05-0.5mol / L and then dispersing 0.05-0.1g of titanium dioxide obtained in the step (1) in the solution; and (3) dissolving a certain amount of silver salt in the deionized water to prepare a solution with the concentration of 0.05-0.5mol / L and then adding the solution into the solution obtained in the step (2) under the magnetic stirring condition in a dropwide mode; continuing to perform reaction for 6 hours after dropwise addition and then performing filtering, washing and vacuum drying at 60 DEG C to obtain the silver phosphate / titanium dioxide composite material. The silver phosphate / titanium dioxide composite material for the photochemical catalysis has the remarkable advantages of effectively avoiding composition of photogenerated electrons and holes, promoting the photochemical catalysis process, increasing an active point of the photochemical catalysis and being simple in preparation method.

The invention discloses a film solar cell and a preparation method thereof. The film solar cell comprises a front electrode layer, a semiconductor layer, a back electrode layer and a tunneling rectification layer. The tunneling rectification layer of a single-layer or multi-layer structure is arranged between the front electrode layer and the semiconductor layer and / or between the semiconductor layer and the back electrode layer, and is made of at least one selected from metal oxide, metal nitride, metal sulfide and metal fluoride. The surface(s) of the front and / or back electrode layer are / is provided with the tunneling rectification layer, the tunneling rectification layer is used to carry out electron rectification, and thus, carrier combination is effectively avoided, the short-circuit current and open-circuit voltage of the solar cell are improved, and the photoelectric conversion efficiency is further improved.

Disclosed herein is a high-efficiency solar cell. More specifically, provided is a solar cell comprising a first conductivity type semiconductor substrate, a second conductivity type semiconductor layer formed on the first conductivity type semiconductor substrate and having a conductivity type opposite to that of the substrate, a p-n junction at an interface therebetween, a rear electrode in contact with at least a portion of the first conductivity type semiconductor substrate, a front electrode in contact with at least a portion of the second conductivity type semiconductor layer, and a silicon oxynitride passivation layer and a silicon nitride anti-reflective layer sequentially formed on a rear surface of the first conductivity type semiconductor substrate and / or a front surface of the second conductivity type semiconductor layer; and a process for preparing the same.

The present invention relates to eukaryotic cells which have the ability to convert L-arabinose into D-xylulose 5-phosphate. The cells have acquired this ability by transformation with nucleotide sequences coding for an arabinose isomerase, a ribulokinase, and a ribulose-5-P-4-epimerase from a bacterium that belongs to a Clavibacter, Arthrobacter or Gramella genus. The cell preferably is a yeast or a filamentous fungus, more preferably a yeast is capable of anaerobic alcoholic fermentation. The may further comprise one or more genetic modifications that increase the flux of the pentose phosphate pathway, reduce unspecific aldose reductase activity, confer to the cell the ability to directly isomerise xylose into xylulose, increase the specific xylulose kinase activity, increase transport of at least one of xylose and arabinose into the host cell, decrease sensitivity to catabolite repression, increase tolerance to ethanol, osmolarity or organic acids; and / or reduce production of by-products. The cell preferably is a cell that has the ability to produce a fermentation product such as ethanol, lactic acid, 3-hydroxy-propionic acid, acrylic acid, acetic acid, succinic acid, citric acid, amino acids, 1,3-propane-diol, ethylene, glycerol, -lactam antibiotics and cephalosporins. The invention further relates to processes for producing these fermentation products wherein a cell of the invention is used to ferment arabinose into the fermentation products.

The invention provides a solar cell and a method for preparing the solar cell. The solar cell comprises an electrode, a light absorption layer, a hole transporting layer and a counter electrode, wherein the light absorption layer is arranged on the lower surface of the electrode, the hole transporting layer is arranged on the lower surface of the light absorption layer and contains a metal phthalocyanine complex, the counter electrode is arranged on the lower surface of the hole transporting layer, and the metal phthalocyanine complex has the general formula shown in the formula I. Thus, the energy level matching degree of the hole transporting layer and the light absorption layer can be improved, the cost is reduced, and the functions for passivating and protecting the light absorption layer are achieved.

The invention relates to a bismuth oxyiodide / porous titanium dioxide compound photocatalyst as well as a preparation method and an application thereof and belongs to the field of photocatalysis. The technical scheme is as follows: bismuth nitrate is dispersed in ethylene glycol, potassium iodide is added, stirring is performed continuously, then porous titanium dioxide microspheres are added, ultrapure water is added, stirring is continuously performed at the room temperature for 1-3 h, an obtained product is washed and dried, and the bismuth oxyiodide / porous titanium dioxide compound photocatalyst is obtained. Porous titanium dioxide microspheres are synthesized with a simple hydrothermal method, and are large in specific surface area, uniform in size and beneficial to light scattering. The bismuth oxyiodide / porous titanium dioxide compound photocatalyst synthesized with the microspheres has the wider spectral response range, has efficient photocatalystic activity under visible light and has characteristics of wide application range and good stability, the technology is simple, operation is easy, and the cost is low.

The invention discloses a carbon fiber / carbon nanotube composite membrane as well as a preparation method and application thereof. The preparation method comprises the following steps of adding polyacrylonitrile into N,N-dimethylformamide as organic solvent, heating the mixed solution to be 30 to 60DEG C, stirring the mixed solution until the polyacrylonitrile is completely dissolved, and configuring to obtain a polyacrylonitrile solution with the mass fraction of 7 to 12 percent; then adding 0 to 20 percent of carbon nanotube counted according to the weight of the polyacrylonitrile into the polyacrylonitrile solution for continuously stirring, and performing electrostatic spinning on the solution to obtain a polyacrylonitrile / carbon nanotube composite membrane; performing preoxidation on the polyacrylonitrile / carbon nanotube composite membrane at the temperature of 200 to 300DEG C for 0.5 to 8 hours, and carbonizing the preoxidized polyacrylonitrile / carbon nanotube composite membrane at the temperature of 600 to 1,100DEG C for 1 to 12 hours to obtain the carbon fiber / carbon nanotube composite membrane. According to the carbon fiber / carbon nanotube composite membrane disclosed by the invention, a carbon fiber / carbon nanotube is taken as a cathode material of a lithium ion battery, and the specific capacity of the lithium ion battery is 1,850 to 2,459mAh / g.

The invention provides a 6-mesitylene-6H-6-boron hetero benzo[cd]pyrene derivative containing substituted or non-substituted carbazolyl. Due to the bipolar transmission characteristic, the derivative can effectively balance transmission of carriers and improve transmission efficiency, by using the derivative in phosphorescent organic light-emitting devices as a main material. The invention also provides an organic electroluminescent device that has increased current efficiency, reduced turn-on voltage and good stability, and solves the problems of low transmission efficiency or poor stability of phosphorescent organic light-emitting main materials in the prior art.

The invention discloses a full-back-electrode solar cell structure and a preparation method therefor. The full-back-electrode solar cell structure comprises a cell substrate, a tunneling passivation layer, and a polycrystalline silicon layer, wherein the tunneling passivation layer is arranged on the back surface of the cell substrate; the polycrystalline silicon layer is arranged on the lower surface of the tunneling passivation layer; and the polycrystalline silicon layer is provided with an N type heavily-doped polycrystalline silicon layer and a P type polycrystalline silicon layer that are arranged side by side. According to the full-back-electrode solar cell structure, the silicon body is good in the surface passivation effect, and carriers can be selectively output, so that the efficiency of the full-back-electrode solar cell is improved.

The invention relates to a perovskite solar cell with a mixed light trapping structure and a preparation method thereof, and belongs to the technical field of perovskite solar cells. The perovskite solar cell comprises a substrate, a conductive electrode, a micro-nano particle light trapping layer, an electron transport layer, a perovskite light absorbing layer, a hole transport layer, a nano Ag optical grating and a metal electrode, wherein the conductive electrode, the micro-nano particle light trapping layer, the electron transport layer, the perovskite light absorbing layer, the hole transport layer, the nano Ag optical grating and the metal electrode are sequentially formed on the substrate, and the micro-nano particle light trapping layer is TiO2 micro-nano particles. The micro-nanostructure is introduced into the perovskite solar cell with the mixed light trapping structure, so that the light trapping capacity of the solar cell can be significantly improved, and the light absorption of the solar cell is enhanced through increasing scattering of the incident light and prolonging the light path of the incident light in the solar cell, so that the light current of the cell isincreased, and the conversion efficiency of the solar cell is effectively improved. Meanwhile, the nano Ag optical grating is introduced to a back electrode of the solar cell, so that a back reflection effect for the transmission light can be effectively increased by combining back reflection of a silver electrode, and thus the absorption of the cell for the incident light is further enhanced.

The invention provides a metal oxide loaded pucherite composite material. According to the metal oxide loaded pucherite composite material, BiVO4 is taken as a precursor material to deposit a precursor film on FTO conductive glass by using an electrochemical deposition method; subsequently the precursor film is roasted to synthesize a BiVO4 film; afterwards the BiVO4 film is subjected to alkalization treatment to obtain a BiVO4(0H-) material; and finally electric deposition is adopted for synthesizing Co2O3 / BiVO4(0H-) of a nanometer flower structure composed of nanometer small particles. The structure effectively restrains recombination of photon-generated carriers and accelerates separation of electrons and cavities, so the metal oxide loaded pucherite composite material is excellent in PEC activity, is applied to a hydrogen evolution reaction as a photoelectric anode, and shows excellent electrolyzed water hydrogen generation performance.

The invention provides preparation of a nickel-cobalt layered double hydroxide nanoparticle-supported bismuth vanadate compound material and application of the nickel-cobalt layered double hydroxide nanoparticle-supported bismuth vanadate compound material to photoelectric water oxidation. The preparation method of the nickel-cobalt layered double hydroxide nanoparticle-supported bismuth vanadatecompound material comprises settling and preparing a precursor BiOI film on FTO (fluorine doped tin oxide) conductive glass, performing annealing to synthesizing a BiVO4 film, then performing electrochemical settlement to successfully loading NiCO-LDH (layered double hydroxide) nanoparticles into the BiVO4 film to form the NiCO-LDH / BiVO4 compound material in a sponge structure, which can effectively inhibit recombination of photo-generated carriers and accelerate separation of electrons and holes and accordingly achieve excellent PEC (photoelectric chemistry) activity. When serving as a photoanode for hydrogen and oxygen evolution reaction, the nickel-cobalt layered double hydroxide nanoparticle-supported bismuth vanadate compound material presents excellent water electrolysis hydrogen andoxygen production performance.

The invention discloses a SiC ring electrode PIN-type nuclear battery and a manufacturing method thereof, which are mainly used for solving the problem that the conversion efficiency of the SiC PIN-junction battery in the prior art is lower. The SiC ring electrode PIN-type nuclear battery comprises a radioactive isotope source layer (1), a SiO2 passivation layer (3), a SiO2 compact insulation layer (2), a p-type ohmic contact electrode (4), a p-type SiC epitaxial layer (5) with the doping concentration of 1*1019-5*1019cm<-3>, an n-type SiC epitaxial layer (6) with the doping concentration of 1*1015-5*1015cm<-3>, an n-type SiC substrate (7) with the doping concentration of 1*1018-7*1018cm<-3> and an n-type ohmic contact electrode (8). A plurality of ring structures the centers of which arerings and the peripheries of which take the centers as circle centers are adopted in the p-type ohmic contact electrode, the rings are connected through a plurality of rectangular strips, a pluralityof pins are reserved on the peripheries of the rings, and the isotope source layer (1) covers the surface of the p-type ohmic contact electrode (4). The SiC ring electrode PIN-type nuclear battery has the advantage of high energy conversion efficiency and can be used as an MEMS (Micro-electromechanical System) on-chip power supply, a cardiac pacemaker power supply and a mobilephone standby power supply.

The invention discloses a silicon carbide gridding electrode PIN type nuclear battery and a manufacturing method thereof. By the silicon carbide gridding electrode PIN type nuclear battery and the manufacturing method thereof, the problem of low conversion efficiency during the manufacturing of silicon carbide PIN nucleus batteries in the prior art is solved. The silicon carbide gridding electrode PIN type nuclear battery comprises a radioactive isotope source layer (1), a SiO2 compact insulating layer (2), a SiO2 passivation layer (3), a p type ohmic contact electrode (4), a p type SiC epitaxial layer (5) of which the doping density is between 1*10<19> and 5*10<19>cm<-3>, an n type SiC epitaxial layer (6) of which the doping density is between 1*10<15> and 5*10<15>cm<-3>, an n type SiC substrate (7) of which the doping density is between 1*10<18> and 7*10<18>cm<-3> and an n type ohmic contact electrode (8), wherein the p type ohmic contact electrode (4) consists of a plurality of identical square grids, the square grids are formed by partitioning a plurality of transverse rectangular strips and a plurality of longitudinal rectangular strips, and a plurality of pins are reserved at the periphery of the integral grid electrode; and the radioactive isotope source layer (1) covers the surface of the p type ohmic contact electrode (4). The silicon carbide gridding electrode PIN type nuclear battery is high in energy conversion efficiency, and can be used as micro-electromechanical system (MEMS) on-chip power supplies, cardiac pacemaker power supplies and mobile standby power supplies.

The invention discloses a titanium dioxide nanowire array film, and preparation and application thereof. The film uses FTO (fluorine-doped tin oxide) conducting glass as a substrate and titanium dioxide as a rutile phase, and has a regular monocrystal one-dimensional structure. The film can be used for solar energy storage and hydrogen production: in a sodium sulfate three-tank reactor in a three-electrode system, light energy formed by light source irradiation is stored onto the TiO2 nanowire film, and the stored energy is used for hydrogen production under the conditions of no sacrifice agent by using Pt as a photocathode material. The energy storage-hydrogen production method is simple to operate and green and environment-friendly in process, has the characteristics of high sustainability and the like, can implement storage and utilization of sunlight, and provides a new research direction for application of the TiO2 film in the field of photoelectric catalysis.

The present disclosure relates to a coal liquefaction system for utilizing a hydrogenated vegetable oil to liquefy coal. The system includes a reactor for exposing a coal to a hydrogenated vegetable oil in the presence of a coal-derived solvent to form a slurry, a heater that elevates the temperature of the slurry in the reactor to facilitate liquefying the coal and liberating a volatile matter, and a centrifuge that separates the insoluble components from the slurry to obtain a de-ashed coal extract, wherein the coal extract is suitable for downstream processing. The system may also include a distillation column that distills the de-ashed coal extract to obtain a pitch. The system may also include a coker that cokes at least one of the de-ashed coal extract and the pitch to obtain a coke

The invention discloses an all-solid-state sensitized solar cell and a preparation method thereof. The all-solid-state sensitized solar cell sequentially comprises a photo anode, an interface modification layer, a hole transport layer and a counter electrode from bottom to top, wherein the photo anode sequentially comprises a conductive glass layer, a dense film layer, a porous film layer and a sensitizer layer form bottom to top, and the dense film layer and the porous film layer are both made from titanium dioxide; the sensitizer layer is made from CH3NH3PbI3; the inference modification layer is made from aluminum oxide or magnesium oxide; the hole transport layer is made from spiro-MeOTAD or PTAA; the counter electrode is an Au electrode. The preparation method comprises the steps of during a process of preparing the solar cell, enabling a thin film to be immersed in polymeric precursor solution of the aluminum oxide after the sensitizer layer is prepared and before the spin-coating of a hole transport material is carried out, and obtaining an aluminum oxide interface modification material after natural drying, wherein the charge recombination can be prevented by the interface modification material, and the electron injection efficiency can be increased. According to the all-solid-state sensitized solar cell and the preparation method, disclosed by the invention, the cost is low, the photoelectric conversion efficiency of an all-solid-state dye-sensitized solar cell can be obviously increased, and a great significance is obtained for practical application of the all-solid-state dye-sensitized solar cell.

The invention discloses a carbon nitride-supported molybdenum nitride nanoparticle photocatalyst, and a preparation method and an application thereof. The preparation method comprises the steps: firstly, preparing ultra-thin precursors of CN and Mo2N, and then preparing a Mo2N aqueous solution and a CN ethanol dispersion solution; and then dropping the CN ethanol dispersion solution into the Mo2Naqueous solution in a 70 DEG C oil bath, stirring and mixing, then centrifuging, washing and drying to obtain the carbon nitride-supported molybdenum nitride nanoparticle photocatalyst. The photocatalyst has the advantages of wide light absorption range, property of high decomposition of water to produce hydrogen, low electrical resistivity, fast current carrier transfer ability, high photogenerated current carrier separation ability, low current carrier recombination rate, good hydrogen evolution circulation stability and the like, is used for photocatalytic decomposition of water to producehydrogen, and has the highest hydrogen production rate reaching 0.89 [mu]mol.g<-1>.h<-1>. The preparation method has the advantages of simple operation, low cost and non-toxic used raw materials, andconforms to production of the concept of environmental protection.

The invention provides a method for degrading pesticide residues on fruit and vegetables. The method comprises the steps of mixing, adjusting pH, performing ultrasonic oscillation and UV (ultraviolet light)-irradiation. The steps are specifically as follows: mixing nanometer TiO2 with ozone water and adjusting pH to 11-12 with a pH modifier; performing ultrasonic oscillation, thereby acquiring a mixed solution; putting the fruit and vegetables into the mixed solution, introducing air into the mixed solution and irradiating for 20min-90min with a UV lamp, thereby finishing the degrading of the pesticide on the fruit and vegetables. According to the invention, after photocatalysis and ozone combined degradation, the pesticide residues on the fruit and vegetables are quickly degraded. The method has the advantages of high efficiency, low cost, safety, environmental protection, and the like.

The invention concerns a gallery mode microdisc system for an electrically pumped optical source, the microdisc (1) being formed on one face of a substrate (2), the lower part of the microdisc being provided with an electrical contact referred to as the lower contact (4), the upper part of the microdisc being provided with an electrical contact referred to as the upper contact (6), the upper part of the microdisc being covered with a protective layer (3) of electrically insulating material, the central part (5) of the microdisc being electrically neutralized in order to prevent the passage of an electric current in said central part.

The invention discloses a Cu-doped ZnO / graphene composite photocatalyst and a preparation method thereof. The method comprises the following steps: mixing graphite oxide and a surfactant CTAB (cetyl trimethyl ammonium bromide) in distilled water and carrying out ultrasonic treatment to obtain a first precursor reactant; dissolving zinc acetate and cupric acetate in the distilled water and carrying out ultrasonic treatment to obtain a second precursor reactant; dissolving hexamethylenetetramine and sodium citrate in the distilled water and carrying out ultrasonic treatment to obtain a third precursor reactant; after mixing the first precursor reactant and the second precursor reactant, carrying out ultrasonic treatment, then mixing the obtained product and the third precursor reactant, controlling reaction temperature in the range of 70 DEG C to 120 DEG C and performing reaction; sealing, naturally cooling, standing and carrying out extraction filtration to obtain filter residues; and after drying the filter residues, carrying out annealing treatment. According to the invention, addition of graphene reduces electron-hole compounding possibility; and meanwhile, introduction of Cu ions can be used as an ion trap to temporarily capture a charge carrier and inhibit electron-hole compounding so as to obviously improve photocatalytic efficiency of the product.

The invention discloses a recyclable zinc oxide / graphene aerogel photocatalyst and a preparation method thereof, belonging to the technical field of photocatalytic material synthesis. The technical scheme is characterized by comprising the following steps: preparing graphene oxide from the raw material graphite powder by an improved Hummers' method; making the prepared graphene oxide into a graphene oxide aqueous solution with mass concentration of 3mg / mL; adding 0.5-2.5g of zinc acetate, and performing hydrothermal reaction in a hydrothermal reaction kettle at 160 DEG C for 10h to obtain hydrogel; and performing dialysis treatment and freeze drying to obtain a zinc oxide / graphene aerogel photocatalyst. In the invention, a zinc oxide / graphene aerogel photocatalyst easy to recycle is prepared by a one-pot method; the aerogel photocatalyst has relatively high degradation efficiency against organic pollutants under natural sunlight irradiation; and the preparation technology is simple and can be repeatedly utilized.

The invention relates to a compounded quindoline derivative as shown in the formula (1), wherein Ar1 and Ar2 are respectively independently selected from C6-C40 substituted or unsubstituted aromatic groups, or can be connected to form C3-C40 substituted or unsubstituted fused aromatic groups. The invention also relates to an application of the compound in organic electroluminescence devices, especially to an application of the compound used as a luminescence host material of OLED devices.