362results 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.

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.

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.

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 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 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 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 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 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.

The invention discloses a preparation method of a cobalt-doped zinc oxide/molybdenum disulfide nano composite antibacterial agent. The advantages of large specific surface area, high surface adsorption capacity and the like of molybdenum disulfide nanosheets are utilized; the preparation method comprises the steps: adsorbing bacteria to the surface of the molybdenum disulfide nanosheets, then cooperatively loading cobalt (Co) doped zinc oxide (ZnO) on the surface and between layers of the molybdenum disulfide nanosheets to play an efficient antibacterial role to kill the bacteria, and thus finally preparing the novel nano composite antibacterial agent with good biocompatibility and high antibacterial activity. The cobalt-doped ZnO quantum dot/molybdenum disulfide nano composite antibacterial agent prepared by the method has the advantages of good biocompatibility, strong broad-spectrum antibacterial effect and the like, and the minimum inhibitory concentration on escherichia coli can reach 0.25 mg/mL.