73results about How to "Change electronic structure" patented technology

The invention provides a nitrogen-phosphorus codoped carbon loaded molybdenum carbide or tungsten carbide catalyst and a preparing method and application thereof. The preparing method includes the following steps that a coprecipitation method is used for preparing a SEP compound material from a surfactant and heteropolyacid or polyoxometalate, the surfactant is a cationic surfactant or ionic liquid surfactant, and the heteropolyacid or polyoxometalate contains molybdenum or tungsten; the SEP compound material, melamine and phytic acid are used as raw materials for synthesizing a SEP-MA-PA compound material through a mixing and dissolving method; under protection of inert gas, the SEP-MA-PA compound material is subjected to heat treatment and cooled to obtain the nitrogen-phosphorus codopedcarbon loaded molybdenum carbide or tungsten carbide catalyst. Nanoparticles of the nitrogen-phosphorus codoped carbon loaded molybdenum carbide or tungsten carbide catalyst are small in size and areof a porous structure, by means of nitrogen-phosphorus heteroatom doping, the conductivity of the catalyst is enhanced, and the catalyst has efficient performance of electrolyzing water for preparinghydrogen.

The invention relates to a method for preparing a distillate oil hydrotreatment catalyst. Ni, Co, W/Mo active components are loaded by gamma-Al2O3 or silicon-containing gamma-Al2O3, P element is included as a cocatalyst component, and any element selected from the group consisting of Mg, Zn, Fe and Ca may also be included as a cocatalyst component. The method for preparing the distillate oil hydrotreatment catalyst comprises the following steps: (1) firstly preparing gamma-Al2O3 or a silicon-containing gamma-Al2O3 carrier; (2) loading the gamma-Al2O3 or the silicon-containing gamma-Al2O3 with a Ni metal component and a P auxiliary component, then drying and calcining; (3) soaking the carrier obtained in step (2) into a solution of Co-containing compound, and W and/or Mo-containing compound, drying and calcining to obtain a finished catalyst. The catalyst can be used for hydrotreatment of light distillate oils such as a reforming raw material, gasoline fraction and kerosene fraction, and has a high hydrodesulfurization activity.

The invention discloses a preparation method for nitrogen-doped graphene, which belongs to the technical field of carbon materials. The preparation method comprises the following steps: dispersing hard template montmorillonite in water to form a suspension and adjusting a pH value to 1 to 5; dissolving nitrogen-containing organic micromolecules which are used as a carbon source in the suspension and adding a polymerization initiator to induce polymerization of the carbon source; subjecting a polymerization product to filtering and washing and drying and calcining a filter cake; and removing the hard template by using hydrofluoric acid and carrying out repeated washing by using deionized water so as to obtain the nitrogen-doped graphene. According to the invention, the cheap nitrogen-containing organic micromolecules are used as the carbon source, the parallel structural and the nanometer spatial confinement effect of the hard template are employed, so the nitrogen-doped graphene with few defects and high quality is formed in carbonization of organic matters; and the method has the advantages of simple operation, safety, no toxicity, short reaction time and low cost.

The invention discloses a micro-nano scale wave structure in a macroscopic composite material and a preparation method thereof, and belongs to the technical field of functional composite materials. Atwo-dimensional nano-material dispersion solution is self-assembled to form a macroscopic structure including a thin film, gel and the like; a carbon-nitrogen compound is generated by utilizing thermal chemical reaction and the state of a two-dimensional composite material is regulated and controlled to form the micro-nano scale wave structure. The micro-nano scale wave structure disclosed by theinvention has the characteristics that a preparation technology is simple, the size and shape of the composite material are easy to regulate and control, the mechanical elasticity, an electronic structure or a surface state of the material is adjustable and the like; a foundation is laid for researches and application of an assembled macroscopic material to the fields including flexible conductors, micromechanical electronics and flexible energy storage devices, catalytic carriers and the like.

The invention provides a multi-element-doped phosphate positive electrode material and a preparation method thereof and a lithium-ion battery. The material has a chemical formula as shown in the formula 1: LixAaMbPOyNnSm; in the formula 1, A is one or more of Ti, Zr, Al, V, Cr and W; M is one or more of Fe, Co, Mn and Ni; x is smaller than or equal to 1.2 and greater than or equal to 0.8; a is smaller than or equal to 0.1 and greater than or equal to 0; b is smaller than or equal to 1.1 and greater than or equal to 0; y is smaller than or equal to 4 and greater than or equal to 3; n is smaller than or equal to 0.2 and greater than or equal to 0; and m is smaller than or equal to 0.2 and greater than or equal to 0. Transition metal cations are doped into the positions of metal elements and a nitrogen element or a sulfur element is doped into an oxygen position at the same time, so that cell parameters of the phosphate positive electrode material can be changed; the transmission speed of lithium ions in crystal lattices is improved; the ionic conductivity is improved; meanwhile, the electron structure of phosphate can be changed; and the electronic conductivity is improved. An experiment result shows that the electronic conductivity of the multi-element-doped phosphate positive electrode material is 10<-6> to 10<-4>s/m.

The invention discloses nitrogen-doped nickel phosphide nano-flower and a preparation method thereof, and applications of the nitrogen-doped nickel phosphide nano-flower as an electrocatalytic hydrogen evolution catalyst. The preparation method comprises: mixing a nickel salt as a metal source and oleylamine as a morphology guiding agent, carrying out a hydrothermal reaction, carrying out heat treatment on the hydrothermal reaction product in an air atmosphere, and carrying out heat treatment on the heat treatment product, a phosphorus source and a nitrogen source in an inert atmosphere to obtain the nitrogen-doped nickel phosphide nano-flower. Compared with the method in the prior art, the method disclosed by the invention is simple to operate and easy for large-scale production, and theprepared nitrogen-doped nickel phosphide nano-flower has advantages of optimized surface electronic structure, multiple active sites, good conductivity, high catalytic activity and the like.

The invention relates to a preparation method of a hydrodesulfurization catalyst for light distillate oil. The preparation method comprises the following steps: (1) firstly preparing a gamma-Al2O3 or titanium-containing gamma-Al2O3 carrier; (2) loading a Co metal component and a P auxiliary component on the gamma-Al2O3 or titanium-containing gamma-Al2O3 carrier, drying and roasting the substances; (3) adopting a solution containing Ni, W and/or Mo compound to soak the carrier obtained in the step (2), drying and roasting the substances to obtain the catalyst. The catalyst can be used for hydrorefining of light distillate oil such as gasoline fraction and kerosene distillate, and performs high hydrodesulfurization activity.

The invention discloses a nickel-nitrogen co-doped porous carbon material loaded with cobalt nanoparticles, and a preparation method and application thereof, and relates to a preparation method of a porous carbon material. The invention aims to solve the problems that conventional methods for preparing porous carbon are tedious in operation steps, time-consuming, high in overpotential, high in equipment requirements and harmful to the environment, limit the preparation of the porous carbon material, are not suitable for large-scale production and cannot meet the new application requirements inthe fields of energy, catalysis, biology and the like. The nickel-nitrogen co-doped porous carbon material loaded with cobalt nanoparticles grows on foamed nickel in situ. The preparation method comprises the following steps: 1, pretreating the foamed nickel; 2, growing a cobalt-based zeolite imidazate framework structure material nanosheet array on the foamed nickel in situ; and 3, carrying outcalcining. The c nickel-nitrogen co-doped porous carbon material loaded with cobalt nanoparticles is used as a catalyst for hydrogen production through water electrolysis in the field of energy. The nickel-nitrogen co-doped porous carbon material loaded with cobalt nanoparticles can be obtained by using the method.

The invention provides a synthesis method of a metal nanoparticle asymmetrical single-face inlayed molybdenum disulfide nanosheet. The synthesis method comprises the following steps that 1, a metal salt powder material and molybdenum disulfide powder material are fully grinded and mixed according to the mass ratio of 1:3 to 1:50; 2, the mixed powder is put in flowing air for calcination, metal salt is decomposed to generate metal nanoparticles, the metal nanoparticles are inlayed on a molybdenum disulfide surface, and natural cooling is performed to obtain a complex; 3, the complex is dissolved in a solvent, and a molybdenum disulfide stratified material is stripped under the ultrasonic effect of a water bath, then the complex is centrifuged to obtain supernatant liquid, the supernatant liquid is centrifugally separated to obtain the metal nanoparticle inlayed molybdenum disulfide nanosheet. The molybdenum disulfide nanosheet is inlayed with the metal nanoparticles on one single face, the metal nanoparticles are narrower and adjustable in size distribution, accordingly the band gap of molybdenum disulfide is adjustable and controllable, the symmetry of molybdenum disulfide is destroyed, accordingly its electronic structure is changed, and meanwhile the number of active sites is increased.

The invention provides a QLED, which comprises a substrate, an anode, a graphene oxide layer, a quantum dot light-emitting layer, a graphene oxide derivative layer and a cathode which are sequentially stacked, wherein the graphene oxide derivative layer is prepared from a graphene oxide derivative; and the graphene oxide derivative is the graphene oxide derivative of which carboxyl protons in graphene oxide are partially or completely replaced with metal elements. The preparation method of the QLED comprises the following steps of (1) providing the substrate, depositing the anode on the substrate and depositing a graphene oxide water solution on the anode to form the graphene oxide layer; depositing the quantum dot light-emitting layer on the graphene oxide layer and depositing the graphene oxide derivative on the quantum dot light-emitting layer to form the graphene oxide derivative layer; and depositing the cathode on the graphene oxide derivative layer.

The invention discloses a preparation method and application of a carbon paper or carbon cloth supported hetero atom-doped molybdenum carbide hydrogen evolution catalyst. The preparation method comprises the following steps: uniformly mixing a molybdenum source, carbon black, an inorganic salt and other doping raw materials, putting carbon fiber paper or carbon fiber cloth treated with a transition metal nitrate and the mixed raw materials into a graphite crucible, placing the graphite crucible in a tube furnace, performing synthesis by using a molten-salt growth method in an inert gas at a low temperature of 800-1100 DEG C, and washing the residual molten salt by using distilled water to obtain the carbon fiber paper or the carbon fiber cloth supported hetero atom-doped synthetic molybdenum carbide hydrogen evolution catalyst. The high-performance low-cost hydrogen evolution catalyst prepared by the method can have excellent performance close to that of a commercial 20% Pt/C catalystwhile maintaining excellent stability under acidic conditions; and the synthetic method proposed by the invention has the advantages of a simple process, economical rationality, environmental friendliness, a controllable morphology and structure and easy large-scale production.

The invention provides a preparation method of nitrogen-doped graphene for a cathode of a lithium ion battery. The method comprises three processes: preparing graphene oxide, restoring graphene oxide, and preparing the nitrogen-doped graphene. The nitrogen-doped graphene is prepared by the following steps: restoring the graphene oxide into prepared graphene; putting into a vacuum tube furnace; and carrying out high-temperature annealing in an ammonia gas at 500-700 DEG C. The prepared nitrogen-doped graphene is annealed in a high-temperature environment until the nitrogen doping amount reaches the maximal value, thus the electronic structure of the graphene is changed; the density of a free carrier of the graphene is improved; and the conductive property, the stability, the first charge-discharge efficiency and the reversible capacity of the graphene are further improved.

The invention provides a copper-based catalyst for preparing methyl glycolate at high selectivity, wherein the catalyst is prepared with a high-specific surface area material as a supporter and copperas an active component through a physical sputtering method in one step. The catalyst is used for a reaction for preparing the methyl glycolate through hydrogenation by catalyzing dimethyl oxalate, wherein the mass content of copper in the catalyst is 5-30% and the balanced being the supporter. The catalyst has the following advantages: (1) the copper is subjected to bombarding of Ar ion, so thatelectron structure of copper is varied, and the copper shows a noble metal-like property, wherein the copper on the catalyst is zero-valent stable copper, which is not liable to be oxidized, so thatthe copper can replace noble metals such as Au and Ag in the ester hydrogenation reaction; (2) the active metal, copper, has high selectivity on the methyl glycolate, so that the catalyst is free of any other additives.

The invention relates to the technical field of solar cells, and particularly relates to an Mxenes-PEDOT:PSS composite flexible electrode. The Mxenes-PEDOT:PSS composite flexible electrode is preparedfrom an Mxenes-PEDOT:PSS composite material by means of one of the following modes: spin coating, blade coating, silk-screen printing, ink-jet printing and film transfer printing. The invention further relates to a solar cell device. The solar cell device comprises a substrate, a bottom electrode, an active layer and a top electrode which are stacked from bottom to top, wherein one of the bottomelectrode and the top electrode adopts the Mxenes-PEDOT:PSS composite flexible electrode. According to the technical scheme, the effect of forming a novel flexible electrode of the solar cell is achieved through a means or scheme of compounding an Mxenes material (two-dimensional transition metal carbide, nitride or carbonitride) and a PEDOT:PSS material.

The invention relates to a coated catalyst, a preparation method thereof and an application of the coated catalyst in a fuel cell. The inner layer of the coated catalyst is transition metal oxide nanoparticles, and the outer layer of the coated catalyst is a sulfur element and nitrogen element doped carbon coating layer. The sulfur, nitrogen and carbon doped and coated in the coated catalyst havethe effect of fixing the active sites of the catalyst while increasing the catalytic active sites, and cooperatively promote the oxygen reduction catalyzed reaction with the transition metal oxide nanoparticles, so that the coated catalyst has the better catalytic effect. Meanwhile, a compact oxidation film is easily formed on the surfaces of the transition metal oxide nano-particles after the high temperature treatment, in addition, a coating layer is also arranged on the surface, so that the coated catalyst has the better corrosion resistance. The catalyst with the coated structure has the better catalytic effect and higher corrosion resistance, the performance of the catalyst is superior to that of a commercial catalyst, and the preparation process is safe and environment-friendly, theflow is simple, the cost of used raw materials is lower, so that the coated catalyst has wide application prospect in the field of fuel cell catalysts.

The invention discloses a catalyst for removing oxygen from hydrogen. The catalyst comprises a metal precursor and a carrier, wherein the metal precursor comprises 0.01-5% by weight of Pt, and the carrier is any one selected from titanium dioxide, aluminum oxide, carbon black and multi-walled carbon nano-tubes. The invention further discloses an ethylene glycol reduction preparation method of thecatalyst, and a specific method for applying the catalyst in hydrogen deoxidizing. According to the present invention, the catalyst has advantages of high deoxidation activity, strong stability and long service life; the preparation method is simple and controlled; and the method for deoxidizing hydrogen by using the catalyst is simple, flexible and efficient, and is convenient for industrialization and popularization.

A method for preparing a distillate oil hydrotreating catalyst, comprising the following processes: (1) mixing pseudoboehmite powder and Tianqing powder evenly, adding peptizer, deionized water, etc. and kneading, then extruding, drying, and roasting, Obtain gamma-Al2O3 or silicon-containing gamma-Al2O3 carrier; (2) use impregnation method to load the impregnating solution prepared by containing Mo compound and B compound, then dry and roast to obtain the catalyst semi-finished product; (3) step (2) ) The catalyst semi-finished product described in the impregnation method is used to load the impregnation solution prepared by the compound containing W, the compound containing Ni and/or Co, and then dry and roast to obtain the finished catalyst; the catalyst can be used for reforming raw materials, gasoline fractions and kerosene Distillate and other light distillate oils are hydrotreated and have high hydrodesulfurization activity.

The invention provides a method for preparing Fe/N co-doped-TNTs (TiO2 nano-tubes)-reduced graphene oxide composite catalysts, and belongs to the field of technologies for photocatalytically degrading organic pollutants. The method includes mixing TiO2 nano-tubes and Fe(NO3)3.9H2O with one another to obtain mixtures, drying the mixtures and calcining the mixtures in N2 flow to obtain Fe-TNTs; dispersing GO (graphene oxide), urea and the Fe-TNTs in water, mixing the GO, the urea, the Fe-TNTs and concentrated HNO3 with one another to obtain mixtures, adding the mixtures into a reaction kettle, carrying out heating reaction, then naturally cooling products until the temperatures of the products reach the room temperature, washing the products and calcining the products in N2 flow to obtain the Fe/N co-doped-TNTs-reduced graphene oxide composite catalysts. The method has the advantages that co-doping is carried out on Fe and N for the TiO2 nano-tubes, accordingly, the visible light sensitization degree can be upgraded, and organic pollutants can be photocatalytically degraded by the Fe/N co-doped-TNTs-reduced graphene oxide composite catalysts in visible light; the Fe/N co-doped-TNTs-reduced graphene oxide composite catalysts comprise TiO2 nano-tube and reduced graphene oxide compositions, accordingly, the absorption spectra of the Fe/N co-doped-TNTs-reduced graphene oxide composite catalysts can be extended and reach the visible light, and the photocatalytic degradation capacity of the Fe/N co-doped-TNTs-reduced graphene oxide composite catalysts for the organic pollutants can be improved; the graphene oxide is doped by N, electronic structures of the graphene oxide can be changed, accordingly, the density of free charge carriers of the graphene oxide can be increased, and the photocatalytic capacity of the Fe/N co-doped-TNTs-reduced graphene oxide composite catalysts in the visible light can be improved.

The invention relates to a preparation method of a CuSn alloy catalyst, and concretely relates to a preparation method of a three-dimensional self-supporting porous CuSn alloy catalyst for producing formic acid through carbon dioxide reduction. The invention aims to solve the problems of poor product selectivity and large electrode overpotential in the electrolysis process of the existing Cu-basedcatalyst. The method comprises the following steps: 1, preparing a copper sulfate and stannous sulfate coexisting solution; 2, electro-depositing; and 3, cleaning and drying. The preparation method is used for preparing the three-dimensional self-supporting porous CuSn alloy catalyst for producing formic acid through carbon dioxide reduction.

The invention discloses a preparation method of a CoFe2O4/F-Ag2MoO4 composite material, wherein the preparation method comprises the following steps: carrying out hybrid reaction on silver nitrate andsodium molybdate, adding sodium bromide and sodium fluoride, and carrying out hydrothermal treatment to obtain the CoFe2O4/F-Ag2MoO4 composite material. The method is low in cost, simple to operate,efficient and energy-saving, and the obtained composite material is applied to an electrocatalytic nitrogen reduction catalyst.

The invention provides an application of a supported platinum nano-cluster catalyst in an alkane anaerobic dehydrogenation reaction. The catalyst takes an oxide as a carrier and platinum nano-clusters as an active component, the platinum nano-clusters are monodispersed on the oxide carrier, and the platinum nano-clusters are composed of ligands and platinum atoms; the ligand is at least one of organic phosphorus and mercaptan; the platinum atoms are diatoms or polyatoms. The preparation method of the catalyst comprises the following steps: (1) preparing a diatomic or polyatomic platinum nano-cluster; (2) loading the diatomic or polyatomic platinum nano-cluster on the carrier; and (3) post-treatment of the catalyst. The catalyst prepared by the method has high-dispersion nanoscale platinum nano-clusters, and has high selectivity to olefin in the anaerobic dehydrogenation reaction of alkane such as propane and the like.

The invention provides a flower-like nanocomposite material. The flower-like nanocomposite material is obtained by compounding materials including nickel hydroxide, graphite-like carbon nitride and graphene oxide, and is flower-like. When the flower-like nanocomposite material provided by the invention is used as an electrode material of a supercapacitor, the material has relatively high electrochemical performance. The results in the embodiment show that the flower-like nanocomposite material provided by the invention has relatively high cyclic stability as an electrode material. After 1000 cycles of charging and discharging, the capacity retention rate of the electrode material reaches 74.3 percent, showing high cyclic stability. In addition, the flower-like nanocomposite material provided by the invention has relatively high energy density, and the specific capacitance is 473.3F/g to 543.8F/g at the current density of 1A/g.

The invention discloses a hydrogenation catalyst, which takes gamma-Al2O3 or siliceous gamma-Al2O3 as a carrier and Ni, Co, W and/or Mo as active components and also contains B auxiliaries. The invention also relates to a preparation method of the hydrogenation catalyst, comprising the following steps: (1) uniformly mixing pseudo-boehmite powder with a certain proportion of sesbania powder, then adding a peptizator and deionized water for kneading, and then carrying out extruding, drying and calcinating to obtain the gamma-Al2O3 or siliceous gamma-Al2O3 carrier; (2) loading the gamma-Al2O3 or siliceous gamma-Al2O3 carrier with impregnation liquid prepared from an Ni containing compound, a B containing compound and other auxiliaries by an impregnation method, and then carrying out drying and calcinating to obtain the semi-finished product of the catalyst; and (3) loading the semi-finished product of the catalyst with impregnation liquid prepared from a Co containing compound, a W and/or Mo containing compound and other auxiliaries by the impregnation method, and then carrying out drying and calcinating to obtain the finished product of the catalyst.

The invention discloses a hydrogenation catalyst and a preparation method thereof. The hydrogenation catalyst comprises a carrier and an active component, wherein the active component is loaded on thecarrier, the carrier comprises silicon oxide modified by nitrogen-doped graphene, the active component comprises active elements, and the active element is selected from at least one of noble metal elements. The invention provides a micron-sized in-situ growth nitrogen-doped graphene wear-resistant spherical silicon oxide carrier, a hydrogenation catalyst loaded with a noble metal active component, and a preparation method of the hydrogenation catalyst, the catalyst has the characteristics of high dispersion degree of the active component, adjustable pore size, high wear resistance, high activity and good stability, and the method is simple and easy to implement, and is suitable for industrial production. The efficiency is high, and large-scale production is easy to realize.

The invention discloses a preparation method for a light-distillate oil hydrogenation treatment catalyst. The preparation method for the catalyst comprises the following steps: (1) firstly preparing acarrier of gamma-Al2O3 or titanium-containing gamma-Al2O3; (2) loading a Co metal component and a B auxiliary agent component on the carrier of the gamma-Al2O3 or the titanium-containing gamma-Al2O3,performing drying and performing roasting; and (3) impregnating the carrier obtained by the step (2) by adopting a solution containing a Ni compound, a W and/or Mo compound, performing drying and performing roasting to obtain the catalyst. The catalyst uses the gamma-Al2O3 or the titanium-containing gamma-Al2O3 as the carrier, uses Co, Ni, and W/Mo as active components, uses a B element as an auxiliary agent, can be used for hydrofining of light distillate oil such as a gasoline distillate and a kerosene distillate, and has high hydrodesulfurization activity.