554results about How to "Good electron transport properties" patented technology

The invention discloses a carbon-silicon composite negative electrode material of a lithium ion battery and a preparation method of the carbon-silicon composite negative electrode material. The negative electrode material is prepared by coating the surface of a single silicon particle with a uniform carbon-cladding layer, an impurity-element-doped carbon-cladding layer or a porous carbon-cladding layer. By adopting a hydrothermal method and subsequent calcining method, environmental friendliness can be achieved, the procedure is simple and easiness in operation can be realized; the silicon and a resilient carbon carrier form a composite material, the electrochemical performance of the silicon material can be improved through the complementary advantages under the synergistic effect of carbon and silicon components, and the primary charging-discharging efficiency and the cycling stability can be improved. The prepared silicon-carbon composite negative electrode material of the lithium ion battery has the advantages of high specific capacity, good cycling stability, safety, no pollution and the like, and an effective way is provided for the research of a high-capacity lithium ion battery.

Provided are a novel nitrogen-containing heterocyclic derivative having a specific structure and an organic electroluminescence device having an organic thin film layer composed of one or a plurality of layers including at least a light emitting layer and interposed between a cathode and an anode, in which at least one layer of the organic thin film layer contains the nitrogen-containing heterocyclic derivative alone or as a component of a mixture. As a result, a novel nitrogen-containing heterocyclic derivative useful as a component of an organic electroluminescence device can be provided, and an organic electroluminescence device being driven at a low voltage and having high luminous efficiency, excellent electron transporting property, and high emission luminance can be realized by using the nitrogen-containing heterocyclic derivative in at least one layer of its organic thin film layer.

The invention discloses a laminated organic thin-film solar cell comprising a substrate, a transparent anode layer, an anode buffering layer, an organic photoelectric conversion layer 1, a connecting layer, an organic photoelectric conversion layer 2, a cathode buffering layer and a cathode layer, wherein the connecting layer can be formed by the following two methods: (1) an enhancement reflection film and a hole transporting layer are combined into the connecting layer; and (2) an enhancement reflection film, a metal thin layer and a hole transporting layer are combined into the connecting layer. The enhancement reflection film can improve the reflectivity of the connecting layer according to the specified range of wavelength. Simultaneously, the enhancement reflection film has better electronic transmission performance, guarantees electrons and holes to be effectively compounded on the connecting layer. The laminated organic thin-film solar cell prepared by the method is characterized by high energy conversion efficiency and good stability.

The invention provides a perovskite thin-film solar cell with a three-dimensional ordered mesopore support layer. The perovskite thin-film solar cell with the three-dimensional ordered mesopore support layer comprises a transparent conducting substrate, a compact layer, the three-dimensional ordered mesopore support layer, a perovskite light absorbing layer, a hole transporting layer and a counter electrode layer which are sequentially laminated to form a laminating layer, wherein the three-dimensional ordered mesopore support layer is filled with the perovskite light absorbing layer, the hole transporting layer and the counter electrode layer; the three-dimensional ordered mesopore support layer is of a three-dimensional ordered mesopore material prepared by using water-soluble colloidal crystal microspheres as a template; the aperture dimension of the three-dimensional ordered mesopore support layer depends on the dimension of the water-soluble colloidal crystal microspheres; and the perovskite light absorbing layer is prepared through materials of an ABXmY3-m type crystal structure. The perovskite thin-film solar cell has the advantages that the three-dimensional ordered mesopore support layer of which the aperture is uniform and adjustable, the specific surface area is relatively large and a good electronic transmission channel is arranged is provided and reaches high photoelectric conversion efficiency and outstanding repeatability and stability; and the preparation method has the advantages that the conditions are mild and controllable, the preparation method is simple and needs a little cost, and large-scale commercial production can be popularized.

The invention discloses a porous carbon membrane for lithium-sulfur batteries and an application of the porous carbon membrane in the lithium-sulfur batteries. According to the porous carbon membrane for the lithium-sulfur batteries, the porous carbon membrane is prepared through subjecting an organic membrane or organic-inorganic composite membrane, which is prepared from organic macromolecular resin, a mixture of organic macromolecular resin and inorganic nanoparticles, a mixture of organic macromolecular resin and an organic complex or a mixture of organic macromolecular resin and a powder carbon material, to preoxidation, programmed heating carbonization and template etching. The porous carbon membrane serves as a positive pole material of the lithium-sulfur batteries and has unapproachable advantages in the aspects of pole preparation process, raw material utilization factor, conductivity, pole composition structure and quality, and the like, thereby having a good application prospect.

The invention discloses a preparation method of a metallic oxide/N-doped carbon nano tube composite material. The preparation method comprises the following steps of: (1) ultrasonically dispersing an N-doped carbon nano tube in a mixed solution of water and alcohol to obtain a solution A; (2) under the condition of stirring, dripping a solution B into the solution A, and stirring to obtain a mixed solution, wherein the solution B is water and/or alcoholic solution containing metal ions; and (3) carrying out solid-liquid separation on the mixed solution, and washing, drying and roasting to obtain the metallic oxide/N-doped carbon nano tube composite material. The invention also provides the composite material obtained through the method and an application thereof. According to the preparation method disclosed by the invention, as a method of solution phase synthesis under the condition of room temperature is adopted, hydrothermal reaction and solvothermal reaction with high temperature and high pressure are avoided, and the composite material with tighter combination of the metallic oxnide and the /N-doped carbon nano tube can be obtained. By adopting the preparation method, the preparation cost is low, the operation is simple, the preparation condition is mild, and the reaction period is also short.

A hybrid solar cell with an aluminum-doped zinc oxide nanorod as the electron transfer layer is composed of a transparent conducting glass substrate, the aluminum-doped zinc oxide nanorod electron transfer layer, a layered perovskite-like hybrid material CH3NH3PbX3(wherein X is Cl, or Br or I),2,2',7,7'-Tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9'-spirobifluorene hole transfer layer and an Au metal back electrode layer, wherein all the parts form a laminated structure in sequence. The hybrid solar cell with the aluminum-doped zinc oxide nanorod as the electron transfer layer has the advantages that due to the fact that the aluminum-doped zinc oxide nanorod is used as the electron transfer layer in the hybrid solar cell, the specific surface area is large, electron-transport capacity is high, electron-hole combination is effectively restrained, and photoelectric conversion efficiency is high; the manufacturing method and technique are simple, reaction temperature is low, efficiency is high, raw materials are rich, cost is low, and environmental friendliness is achieved. The hybrid solar cell with the aluminum-doped zinc oxide nanorod as the electron transfer layer is suitable for industrialized large-scale production.

The invention discloses an anode material for a lithium-ion battery. The anode material comprises a carbon core layer and a silicon wrapping layer. The silicon wrapping layer wraps the carbon core layer to form a silicon/carbon composite material. The anode material further comprises a metallic oxide wrapping layer serving as the outer wrapping layer of the silicon/carbon composite material. The anode material solves the problem that due to the fact that a silicon-contained anode material is prone to expansion, the battery capacity is rapidly reduced. The invention further discloses a preparation and application of the anode material for the lithium-ion battery. The preparation method includes the step of conducting high-temperature annealing to form the anode material after the silicon/carbon composite material is fluidified and wrapped by a metal salt solution. The lithium-ion battery more excellent in performance can be obtained when the anode material is applied.

The invention discloses a conductive polymer-coated silicon-based negative electrode material and a preparation method thereof. The method comprises the following steps of adding sodium alginate to a water solution, and then stirring and dissolving the sodium alginate; adding a conductive polymer monomer to the completely dissolved sodium alginate solution and stirring evenly; adding taken nanometer silicon to a mixed solution and mixing evenly through an ultrasound method to obtain a silicon dispersion liquid; adding an initiator to the silicon dispersion liquid and carrying out polymerization reaction on the conductive polymer monomer to obtain the conductive polymer-coated silicon-based negative electrode material; and carrying out washing and drying and finishing preparation of a final product. A three-dimensional mesh structure is built by the conductive polymer, so that the conductive polymer-coated silicon-based negative electrode material has conductivity and also provides a certain accommodation space for volume expansion of the silicon; and the silicon is embedded into the mesh structure, so that the volume effect of the silicon is effectively relieved. Furthermore, the hydroxyl-containing sodium alginate is introduced, so that the structure stability of the overall silicon-based negative electrode material is strengthened.

A dye-sensitized solar cell comprising a semiconductor electrode prepared by spraying a metal oxide nanoparticle dispersion on a conductive substrate using an electric field to form a metal oxide nanoball layer which is composed of agglomerated metal oxide nanoparticles and has a high porosity and specific surface area, exhibits improved photoelectric properties even when a gel or solid electrolyte is used.

The present invention discloses an electrode with self-support structure, and a preparation method thereof, and an application thereof. The electrode comprises a conductive collector and electrode active materials; and the electrode active materials are in in-situ growth at the surface of the conductive collector in a nanorod array mode, wherein the electrode active materials are metallic oxide coated with carbon quantum dots, the taking amount on the electrode is 0.5-30mg/cm2, and preferably, the taking amount on the electrode is 1-10mg/cm2. The electrode provided by the invention is low in impedance, fast in electrical transmission and large in specific capacity of the electrode, and the preparation process is simple and has wide applicability.

The invention provides a process for producing a layer of a semiconductor material, wherein the process comprises: a) disposing on a substrate: i) a plurality of particles of a semiconductor material, ii) a binder, wherein the binder is a molecular compound comprising at least one metal atom or metalloid atom, and iii) a solvent; and b) removing the solvent. The invention also provides a layer of semiconductor material obtainable by this process. In a preferred embodiment, the particles of a semiconductor material comprise mesoporous particles of the semiconductor material or mesoporous single crystals of the semiconductor material. The invention provides a process for producing a compact layer of a semiconductor material, wherein the process comprises: disposing on a substrate i) a solvent, and ii) a molecular compound comprising at least one metal or metalloid atom and one or more groups of formula OR, wherein each R is the same or different and is an unsubstituted or substituted C₁-C₈ hydrocarbyl group, and wherein two or more R groups may be bonded to each other; and b) removing the solvent. The invention also provides a compact layer of a semiconductor material obtainable by this process. These processes can be effectively performed at temperatures of less than 300° C. Further provided are semiconductor devices comprising either a layer of a semiconductor material or a compact layer of a semiconductor material obtainable by the processes of the invention. The invention also provides a process for producing a semiconductor device.

The invention relates to a preparation method of an S-C positive pole microwave composite material of a high cycle performance lithium sulfur battery. Firstly, sulfur, carbon materials are put into a ball mill for ball-milling mixing, and then put into a microwave oven for microwave heating and compositing to prepare the S-C positive pole microwave composite material with high dispersion uniformity. The S-C positive pole microwave composite material and a conductive agent are ground and mixed uniformly, the S-C positive pole microwave composite material and a binder are dispersed in an organic solvent in a certain proportion, and stirred to prepare paste, and then the paste is evenly coated onto a current collector sheet, and dried to prepare a positive pole. The preparation method adopts an advanced microwave heating method, has the advantages of fast heating speed, mild conditions and high efficiency, the prepared positive pole composite material is stable in structure, the battery has good cycle stability, at the same time, the commercial carbon material with low price is used, the material cost is greatly reduced, and the preparation method is suitable for popularization.

The invention discloses a preparation method for a copper/cuprous oxide/cyclized polyacrylonitrile visible-light-driven photocatalyst, and belongs to the technical field of environmental cleaning photocatalyst new materials. The preparation method includes the steps of firstly, preparing a nanometer copper hydroxide/photocatalyst compound by synchronously conducting solvent conversion and in-situ ion exchange reaction with photocatalyst, cupric nitrate and sodium hydroxide as raw materials; secondly, reducing copper hydroxide into cuprous oxide in situ through ascorbic acid; thirdly, conducting thermal treatment under the nitrogen atmosphere, reducing a small amount of cuprous oxide into elementary substance copper while cyclization and dehydrogenation are conducted on polyacrylonitrile to form a conjugated structure, and obtaining the copper/cuprous oxide/cyclized polyacrylonitrile visible-light-driven photocatalyst. The raw materials are wide in source, cost is low, the preparation method is simple and suitable for large-scale production, cyclized polyacrylonitrile can improve the separation efficiency of photoproduction electron holes and absorption of the visible light areas and can have a protection and optical corrosion reduction effect on copper/cuprous oxide, and the obtained catalyst is remarkable in adsorption and photocatalytic effect.

The invention discloses a method for electro-chemical compounding of graphene and metallic oxide. The method comprises the following steps of: (1) adding a graphite flake as a positive electrode and a platinum sheet as a negative electrode into an electrolyte solution; (2) adding variational voltage for 1-60 minutes between the positive electrode and the negative electrode; and (3) centrifuging, washing and carrying out vacuum drying to obtain a compound of the graphene and the metallic oxide. The compound material of the graphene and the metallic oxide, prepared by the method, has excellent electrical transmission performance and excellent performances, can serve as a lithium ion battery cathode material and a photocatalytic-degraded organic pollutant material and is simple to operate and suitable for large-scale industrial production.

According to the present invention, there are provided a pyrimidine derivative represented by a general formula (1) indicated below, and an organic electroluminescent device comprising a pair of electrodes, and at least one organic layer sandwiched therebetween, wherein the pyrimidine derivative is used as a constituent material for the at least one organic layer. The pyrimidine derivative of the present invention is a material for a high efficiency, high durability organic electroluminescent device, is excellent in electron injection/transport performance, has hole blocking capability, and excels in characteristics.

An organic compound is represented by following Formula (I):

The invention relates to a copper-iron layered double metal hydroxide, a copper-iron layered double metal hydroxide/carbon based composite material as well as preparation methods and application of the copper-iron layered double metal hydroxide and the composite material. The preparation method of the copper-iron layered double metal hydroxide includes the following steps: (1) dissolving a metal copper salt and a metal iron salt into deionized water to obtain a mixed solution; and (2) adding an alkaline reagent into the mixed solution, adjusting the pH to 5-7, and performing aging at 60-130 DEG C for 20-80 h to obtain the copper-iron layered double metal hydroxide.

The invention relates to a g-C3N4 supported cobalt oxide catalyst and a preparation method thereof. The preparation method comprises the following steps: preparing an aqueous solution of cobalt acetate and an aqueous solution of g-C3N4, mixing, and magnetically stirring to obtain a mixed solution A; adding ammonia water to the mixed solution A in a dropwise manner, and magnetically stirring to obtain a mixed solution B; adding the mixed solution B to an autoclave provided with a polytetrafluoroethylene liner, and carrying out a hydrothermal reaction at 130-160DEG C for 8-12h to obtain a mixture; and centrifuging the mixture, removing the obtained supernatant, washing the obtained residual solid substance, transferring the solid substance to an oven, and drying at 60DEG C for 8h to prepare the g-C3N4 supported cobalt oxide catalyst. The prepared catalyst can be used in catalysis of carbon monoxide low temperature oxidation, and can maintain complete conversion of carbon monoxide into carbon dioxide at 122DEG C for at least 2400min.

The invention discloses a sulfur-loaded MOF@ conductive polymer material with high electronic conductivity and a preparation method thereof. The method comprises the steps that activated MOF powder isuniformly mixed with elemental sulfur, a mixture is heated after sealing is conducted, and the sulfur-loaded MOF material is obtained after cooling is conducted; the sulfur-loaded MOF material is modified with a surface active agent, the sulfur-loaded MOF material and conductive polymer monomers are dispersed in a solvent, and a polymerization agent is added in to conduct oxidative polymerizationreaction to obtain the sulfur-loaded MOF@ conductive polymer material. The abundant and ordered porous structure of the MOF can be maintained by the material, and the material has a core-shell structure which has better electronic transmission performance. Sulfur can be better dispersed in pores of MOF polarity by the MOF in the form of molecular state, and the MOF has a certain restriction effect on the dispersing of Li2S6 generated in the discharging process. Abundant electronic transmission channels are provided by conductive polymers, and the dissolving and dispersing of Li2S6 in electrolyte can be prevented. The material of a positive electrode of a Li-S battery has high specific capacity and circulation stability due to the synergistic reaction of the MOF and the conductive polymers.

The invention relates to a carbon-supported transition metal phosphide electrocatalyst for hydrogen generation and a preparation method of the electrocatalyst. A carbon-supported metal precursor is prepared through in-situ growth by using a transition metal-catalyzed carbon material, then phosphorization is conducted on the metal precursor so as to obtain the carbon-supported transition metal phosphide electrocatalyst for hydrogen generation. In the electrochemical hydrogen generation reaction, only overpotentials of 49 and 130 mV are required by the prepared carbon-supported iron phosphide (FeP/Fe@NC) when the current density is 10 and 100 mA/cm<2>, and meanwhile the catalyst has excellent stability without deactivation for 90 hours or above at a current density of 10 mA/cm<2>. The preparation method is simple and easy, the required raw materials are cheap and easily available, and high binding between the catalyst and the carbon carrier and excellent dispersibility of the catalyst can be ensured, so that the catalyst has good conductivity and electron transport characteristics.

The invention relates to a photoelectric function material with a N-P=S resonant structure, a preparation method and application. The structure of the material is shown as a formula (I) in the specification, and in the formula (I), Ar represents carbazole or t-butyl carbazole, and Ph is phenyl. The photoelectric function material, which possesses the N-P=S resonant structure, dynamically-adjustable electricity performances, high triplet state energy level and bipolar transmission property, has the advantages of cheap raw materials, simple and convenient synthetic method, and good dissolvability, film-forming ability and stability. By introducing the N-P=S resonant structure, the material is obviously improved in carrier transmission capability and is endowed with excellent cavity transmission and electron transmission capability. Electroluminescent devices prepared from the material have high efficiency, relatively low turn-on voltage and stable electroluminescent performances. The technical scheme has important meaning on development of efficient stable organic light-emitting diodes.

The invention relates to a nickel-cobalt lithium manganate positive material, a preparation method thereof and a lithium ion battery. The nickel-cobalt lithium manganate positive material comprises monocrystal nickel-cobalt lithium manganate and a coating layer coated on the surface of the monocrystal nickel-cobalt lithium manganate, and the coating layer consists of lithium vanadium phosphate anda carbon material. Compared with the prior art, the lithium vanadium phosphate and the carbon material are coated on the surface of the monocrystal nickel-cobalt lithium manganate to form a compositematerial, good ion transport performance of lithium vanadium phosphate is combined with preferable electron transport performance of carbon, the electrochemical activity of the monocrystal material is improved, and the gram volume and rate capability of the monocrystal nickel-cobalt lithium manganate positive material are improved greatly.

An organic light-emitting device includes a first electrode; a second electrode; and an organic layer interposed between the first electrode and the second electrode, the organic layer including one or more anthracene derivative compounds represented by Formula 1 below and optionally an ionic metal complex:

wherein R₁ and R₂ are each independently a hydrogen atom, a substituted or unsubstituted C1-C30 alkyl group, a substituted or unsubstituted C1-C30 alkoxy group, a substituted or unsubstituted C6-C30 aryl group, a substituted or unsubstituted C6-C30 aryloxy group, a substituted or unsubstituted C4-C30 heteroaryl group, a substituted or unsubstituted C6-C30 condensed polycyclic group, a hydroxyl group, halogen, a cyano group, or a substituted or unsubstituted amino group.

The invention discloses a method for preparing novel carbon quantum dot/flower-shaped indium and calcium sulfide (CQDs/CaIn2S4) composite photocatalysts, and belongs to the field of environmental protection. The method includes preparing the CQDs/CaIn2S4 composite photocatalysts by the aid of in-situ hydrothermal processes at certain temperatures. The CQDs/CaIn2S4 composite photocatalysts prepared by the aid of the method can be applied to catalytically degrading tetracycline hydrochloride solution under the sunlight or visible light. The method has the advantages that the method includes simple technologies, is free of pollutant discharge in preparation procedures and is short in preparation period and low in energy consumption and cost, is a green synthesis technique, and the carbon quantum dot/flower-shaped indium and calcium sulfide composite photocatalysts can be prepared on a large scale; the visible light response and the adsorption capacity of the carbon quantum dot/flower-shaped indium and calcium sulfide composite photocatalysts can be improved after CQDs (carbon quantum dots) are compounded, the service lives of electrons-holes can be prolonged, photoelectron transmission can be promoted, and the visible light photocatalytic activity of the carbon quantum dot/flower-shaped indium and calcium sulfide composite photocatalysts can be greatly improved.

The invention discloses an acrylate copolymer-modified metal oxide, a QLED and a preparation method. The method comprises the steps of adding an acrylate copolymer solution to a pre-prepared metal oxide solution under a certain atmosphere and then stirring at 60-80 DEG C for 0.5-8h to obtain a mixed solution; and adding a solvent to purify the mixed solution and carrying out centrifugal separationto obtain a white precipitate, wherein the white precipitate is the acrylate copolymer-modified metal oxide. The metal oxide is modified by using an acrylate copolymer, so that on one hand, the acrylate copolymer-modified metal oxide can play roles in passivating surface defects of the metal oxide and reducing exciton quenching and carrier recombination through the surface defects, and on the other hand, the surface potential of the metal oxide can be improved, thereby improving the electron injection level and the electron transport capacity; and furthermore, the acrylate copolymer is capable of improving the dispersity of metal oxide nanoparticles, thereby facilitating formation of a smooth film and improvement of the transmittance of the film.