755 results about "Metal doped" patented technology

The invention discloses an alkaline battery capable of improving low-temperature discharge performance and a preparation method thereof, and the preparation method comprises the following steps: S1, preparing a positive electrode ring: preparing a positive electrode material from metal-doped composite manganese dioxide, an adhesive and a potassium hydroxide solution; s2, preparing negative electrode zinc paste, mixing and ball-milling nano zinc powder, indium powder and gallium powder into alloyed zinc powder, adding a composite conductive additive, a composite binder and a low-temperature-resistant additive, and stirring and dispersing to form the negative electrode zinc paste; s3, sleeving the positive electrode ring into the steel shell, inserting a diaphragm and injecting electrolyte; and S4, injecting negative electrode zinc paste, and packaging to obtain a finished product. According to the negative electrode zinc paste, the zinc utilization rate can be increased through nano zinc powder alloying, meanwhile, the freezing point is reduced through the low-temperature-resistant additive, and the reaction efficiency and fluidity of the negative electrode zinc paste at the low temperature are improved; ethylene glycol in the electrolyte is combined with nano zirconium dioxide, so that the stability and the ion migration capability can be improved, the discharge performance of the alkaline battery under a low-temperature working condition is improved, and the service life of the alkaline battery under the low-temperature working condition is prolonged.

The invention relates to the technical field of lithium ion batteries, in particular to a gradient-doped lithium iron phosphate positive electrode material and a preparation method and application thereof. The invention provides a gradient doped lithium iron phosphate positive electrode material, on a particle cross section of the lithium iron phosphate positive electrode material, a particle center is taken as a circle center, a distance from the particle center to a nearest surface is taken as a radius R, a concentric circle region with a radius of 0.5 R is taken as a central region, and the rest part is a surface layer region, the metal doping amount of the central region is D1, the metal doping amount of the surface layer area is D2, D1 is larger than D2, delta D is equal to D1-D2, and delta D is larger than or equal to 2000 ppm and smaller than or equal to 4000 ppm. In the obtained lithium iron phosphate positive electrode material, sufficient compaction density can be ensured, the problem of poor dynamic performance of the positive electrode material can be well solved, and the discharge performance and rate capability of the lithium iron phosphate positive electrode material are effectively improved.

The invention relates to the technical field of solar cells, and provides a laminated cell and a manufacturing method thereof, which are at least beneficial to improving the efficiency of the laminated cell. The laminated cell comprises a crystalline silicon bottom cell, a middle layer and a perovskite top cell which are sequentially laminated in a preset direction, the middle layer comprises a conductive composite layer, the conductive composite layer is located on the surface, facing the perovskite top cell, of the crystalline silicon bottom cell, and materials of the conductive composite layer comprise a conductive polymer and a metal dopant; the metal grid layer is embedded into one side, far away from the crystalline silicon bottom battery, of the conductive composite layer, and the conductive composite layer exposes the surface, far away from the conductive composite layer, of the metal grid layer; the barrier layer is located on the side, away from the composite layer, of the metal grid layer and covers the surfaces of the metal grid layer and the conductive composite layer.

The invention relates to the technical field of preparation of positive electrode materials, in particular to a preparation method and application of a lithium iron phosphate material. The preparation method at least comprises a process of sintering a precursor material under a reduction condition to obtain the lithium iron phosphate material, wherein the precursor material at least comprises an iron source, a lithium source, a phosphorus source and a metal dopant, the mass ratio of the metal dopant is larger than or equal to 0, and the molar ratio of the iron element to the total phosphorus and the molar ratio of the doped metal to the total phosphorus are 0.96-0.97. According to the preparation method, generation of the iron phosphide (Fe3P, Fe2P, FeP and the like) impure phase is controlled from the burdening end by regulating and controlling the proportion of specific elements in the raw materials, so that preparation of the lithium iron phosphate material with high compaction and low iron phosphide impure phase is realized, and subsequent complicated impurity removal operation is avoided.

The invention discloses a metal-doped carbon quantum dot as well as preparation and application of the metal-doped carbon quantum dot in a nano antibacterial agent, citric acid, urea and tea polyphenol are taken as precursors, metal salt is added, carbon dot synthesis and metal ion doping are synchronously completed in one step through a hydrothermal method, and the metal-doped carbon quantum dot is prepared; the surfaces of the metal-doped carbon quantum dots are negatively charged, and the metal-doped carbon quantum dots have peroxidase-like activity and catalase-like activity at the same time; the metal ions adopt any one of Fe < 3 + >, Cu < 2 + > and Ce < 3 + >; the metal-doped carbon quantum dots are in a sphere-like shape. The metal-doped carbon quantum dots prepared by the preparation method disclosed by the invention have peroxidase-like activity and catalase-like activity at the same time through precise doping of metal ions, and the two activities have a synergistic effect in an oral periodontitis microenvironment, so that a good antibacterial effect is achieved.

The invention provides a lithium iron phosphate positive electrode material, a preparation method thereof, a positive electrode plate and a lithium ion battery. The preparation method comprises the following steps: preparing a ferrous source, a phosphorus source, an oxidant and a first pH regulator into first slurry, and carrying out first reaction on the first slurry to obtain second slurry; adding a second pH regulator into the second slurry, and carrying out a second reaction to obtain a third slurry; aging and filtering the third slurry to obtain a first precursor and a second precursor; mixing and calcining the first precursor, the second precursor and a metal doping source to obtain a third precursor; mixing the third precursor with a lithium source to obtain a fourth precursor; mixing the fourth precursor with oxalic acid, and performing secondary calcination to obtain a first product; and reacting the first product with a carbon source and a non-metal doping source to obtain the lithium iron phosphate positive electrode material. According to the invention, the preparation process of the precursor is optimized, and meanwhile, the whole preparation process of the lithium iron phosphate positive electrode material is optimized.

A semiconductor device and methods for forming the semiconductor device are described. The semiconductor device can include a top transistor and a bottom transistor arranged in a stack configuration, and an isolation layer situated between the top transistor and the bottom transistor. The top transistor can be encompassed by a high-k gate dielectric. The bottom transistor can be encompassed by a metal-doped high-k gate dielectric. A first portion of the isolation layer can be encompassed by the high-k gate dielectric. A second portion of the isolation layer can be encompassed by the metal-doped high-k gate dielectric. The metal-doped high-k gate dielectric can encompass the bottom transistor and the second portion of the isolation layer can be encompassed by a layer of first work function material (WFM). The first WFM can be encompassed by a second WFM.

An oxygen evolution reaction electrocatalyst and a method for preparing said oxygen evolution reaction electrocatalyst are disclosed. The method comprises the steps of contacting a porous zeolite with a solution containing a noble metal precursor to form a noble metal doped zeolite, pyrolyzing the noble metal doped zeolite to form nanocrystals comprising at least the noble metal and a second metal, said nanocrystals being confined within a layer of carbon-based material, wherein the second metal and the carbon-based material are derived from the pyrolyzed zeolite, and annealing said layer of carbon-based material confined nanocrystals to form isolated noble metal atoms singly dispersed within a metal oxide lattice of the second metal as an oxygen evolution reaction electrocatalyst.

The invention provides a metal doped silicon carbon negative electrode material and a preparation method thereof, and the preparation method comprises the following steps: a modified amorphous carbon material and a metal silane precursor are respectively prepared, the particle size of the modified amorphous carbon material is 7-8 [mu] m, and the internal pore size of the modified amorphous carbon material is 0.1-10 nm; the modified amorphous carbon material is placed in a chemical vapor deposition reactor, nitrogen is introduced, the temperature is increased to 500-700 DEG C, then composite gas is introduced, the deposition reaction is carried out for 100-800 minutes, a pre-product is obtained, the composite gas comprises a metal silane precursor, doping auxiliary gas and acetylene gas, and the doping auxiliary gas is used for regulating and controlling growth of sediments; and heating the pre-product to 750-850 DEG C for 10-30 minutes, cooling the pre-product to 500-600 DEG C, introducing acetylene gas again, and keeping the temperature for 30-300 minutes to obtain the metal-doped silicon-carbon negative electrode material. Therefore, the electrochemical performance and the cycle life are effectively improved.

The invention discloses a carbon nitride-based composite material as well as a preparation method and application thereof. The carbon nitride-based composite material comprises a non-metal doped carbon nitride carrier and a noble metal, wherein the noble metal exists in the carrier in an element doping form and / or is loaded on the carrier in an oxide form; the precious metal is one or more of Pt, Pd, Au and Ru, and the nonmetal is one or more of P, S and I. According to the carbon nitride composite material disclosed by the invention, noble metal is utilized to modify carbon nitride, the number of surface active sites is increased, the electron and chemical structures of an active center are adjusted, and meanwhile, generation and migration of photo-generated charges are promoted. Meanwhile, the surface of the carbon nitride composite material is modified by non-metallic elements, so that adsorption and activation of reactant H2O molecules are effectively promoted. The catalyst disclosed by the invention is simple in preparation process, good in repeatability and easy for large-scale production.

The invention relates to a hollow mesoporous carbon sphere prepared based on a confinement polymerization method and a preparation method of a platinum alloy catalyst loaded by the hollow mesoporous carbon sphere and doped with rare earth metal. The method comprises the following steps: by taking mesoporous silica as a template, introducing an initiator and a small molecular organic matter precursor into mesopores, and carrying out confinement polymerization in the mesopores to obtain a silica / polymer composite; carrying out high-temperature calcination and etching treatment on the complex to obtain hollow mesoporous carbon spheres; the carbon sphere is used as a carrier to load a platinum alloy doped with rare earth metal. The hollow mesoporous carbon spheres prepared by the method have good spherical morphology and mesoporous channels and high specific surface area, and the problems of non-uniform morphology, unobvious mesopores and the like in a traditional method are solved. After platinum alloy particles doped with rare earth metal are loaded on the carbon spheres, the problems of agglomeration, wide particle size distribution, poor performance and the like of the platinum alloy particles are solved.

The invention discloses a hydrogel-based water-energy-resource co-production solar evaporator and application thereof, and belongs to the technical field of chemistry and environment, the hydrogel-based water-energy-resource co-production solar evaporator is prepared by taking sodium alginate hydrogel as a matrix, adding carbon nanotubes and a titanium-based lithium ion sieve or a metal-doped titanium-based lithium ion sieve into a solution of the sodium alginate hydrogel, taking polyurethane sponge as a carrier frame, and preparing the hydrogel-based water-energy-resource co-production solar evaporator. Ca2 + is adopted as a cross-linking agent to construct a solar evaporator with a flexible size (centimeter-level to meter-level components can be prepared according to application scenes), the solar evaporator is used for the solar driven evaporation process of lithium-containing water resources such as salt lake seawater, and Li + selective enrichment, fresh water collection and waste heat power generation are synchronously achieved. Moreover, the evaporator has the characteristics of simple preparation process, low cost and excellent environmental compatibility, also has a good removal effect on salt ions, and keeps stable fresh water collection performance in a long-time operation process.

The invention discloses a preparation method of a metal-doped cobalt-based oxide material, which comprises the following steps: metal nitrate is dissolved in glycerol and isopropanol, a solvothermal method is adopted for reaction to obtain a reaction product, the metal in the metal nitrate comprises cobalt and at least one of nickel, copper, iron or molybdenum, the concentration of cobalt nitrate in the dissolved solution is 0.001-0.05 mM, and the concentration of cobalt nitrate in the solution is 0.01-0.05 mM; the concentration of metal nitrate except cobalt is 0.1-1 mu M; the reaction product is subjected to high-temperature calcination, the metal-doped cobalt-based oxide material with the microstructure being nanospheres with rough surfaces is obtained, the reaction temperature of the solvothermal method is 120-180 DEG C, and the reaction time is 3-6 h. The invention also discloses the metal element doped cobalt-based oxide material obtained by the preparation method and application of the metal element doped cobalt-based oxide material in electrocatalytic nitrate reduction synthesis of ammonia. The preparation method provided by the invention is simple, and the prepared metal-doped cobalt-based oxide material shows excellent electrochemical performance when applied to electrocatalytic nitrate reduction synthesis of ammonia.

A flexible pH sensor and a measurement system, belonging to the technical field of sensors. Using a material that does not react with an electrolyte, mixed with a metal, an anode substrate is printed, and by means of an electrochemical method, one-step synthesis of a metal-doped polyaniline composite material is implemented. By means of controlling the metal content, the doping amount of metal ions in the polyaniline can be changed. Adding metal increases the conductivity of the anode substrate, which facilitates deposition of polyaniline. The one-step method for preparing a polyaniline composite material is simple, low-cost, and pollution-free; compared with pure polyaniline, the composite material has improved sensitivity. The metal-doped polyaniline composite material is used in a pH sensor for the first time, thus implementing a wide pH measurement range (2-12) and a high bending stability. The flexible pH sensor can be used in saliva pH measurement, and to measure the freshness of fresh food.

The invention provides a metal M-doped layered Cu-based catalyst as well as a preparation method and application thereof. According to the invention, copper salt, zinc salt, aluminum salt and metal M salt are used as raw materials, and the active metal Cu in the prepared catalyst is highly dispersed and still keeps an intercalation structure through the controllable characteristics of element composition, structural topological transformation and the like of the metal M doped layered Cu-based catalyst. Besides, through doping of different metals M, a metal-carrier interface structure, oxygen vacancy concentration and quantity, alkaline sites, Cu metal size and the like in the catalyst are changed, so that the catalytic activity is improved. Moreover, Cu in the metal M-doped layered Cu-based catalyst prepared by different methods is good in dispersity, and when the metal M-doped layered Cu-based catalyst is used for preparing methanol through COx (x = 1 and / or 2) hydrogenation, the metal M-doped layered Cu-based catalyst has excellent stability, catalytic activity and relatively high selectivity, and can be popularized and applied to various heterogeneous catalytic reaction fields such as hydrogenation, dehydrogenation and the like.

An optical component includes a substrate and an anti-reflective film. The substrate has an aspherical surface through which light passes. The anti-reflective film is disposed at least on the aspherical surface and includes a nanostructure layer and an intermediate layer. The nanostructure layer includes ridge-like protrusions that are non-directionally extended. A bottom of the ridge-like protrusions is closer to the substrate than a top of the ridge-like protrusions. The ridge-like protrusions gradually taper from the bottom toward the top. An average structural height of the ridge-like protrusions ranges from 108 to 368 nm. The intermediate layer is between the nanostructure layer and the substrate. A main component of the nanostructure layer is aluminum oxide. The nanostructure layer includes a metallic doping agent at least partially distributed inside the ridge-like protrusions. The metallic doping agent includes at least one of titanium, vanadium, chromium, titanium oxide, vanadium oxide, and chromium oxide.

The invention relates to the technical field of photocatalysis, in particular to a Ni / Ga bimetal doped g-C3N4 nanotube composite material as well as a preparation method and application thereof. The Ni / Ga bimetal doped g-C3N4 nanotube composite material with the nitrogen vacancy is formed by doping Ni and Ga bimetals into the g-C3N4 nanotube and calcining the g-C3N4 nanotube in the air atmosphere to introduce the nitrogen vacancy. Nitrogen vacancies and double metal doping synergistically improve the efficiency of photocatalytic hydrogen production, because the Ni / Ga double metal doped g-C3N4 nanotube composite material with the nitrogen vacancies has a wider visible light absorption range, a lower carrier recombination rate, a higher electron transfer rate and higher stability, the composite material further has higher hydrogen production efficiency.

The invention discloses a preparation method of a metal doped type hydroxyapatite nanoflower. The method specifically comprises the following steps: dispersing a calcium source and soluble metal salt into water, adding acid phosphate, urea and L-histidine, uniformly mixing, carrying out a hydrothermal reaction, mechanically stirring, filtering, washing, and drying a hydrothermal system precipitate to obtain the corresponding metal-doped hydroxyapatite nanoflower. Compared with the prior art, the metal-doped hydroxyapatite nanoflower prepared by the preparation method disclosed by the invention is directly assembled by nanosheets, and a single metal type can be doped in a customized manner. According to the method, water is used as a unique solvent, the use of an organic solvent is avoided, the pH does not need to be adjusted in advance, the technological process is simple, operation is convenient, equipment investment is small, and the method is suitable for industrial production.

The invention discloses a rare earth metal doped transition metal electrocatalyst and a preparation method and application thereof, the chemical formula of the catalyst is Eu-CoS1.097, the catalyst is of a crystalline and amorphous structure, and the Eu element exists in a monatomic form; the preparation method comprises the following steps: (1) dissolving polyvinylpyrrolidone and NH2-H2BDC in a solvent to obtain a mixed solution; (2) adding cobalt salt and europium salt into the mixed solution, uniformly mixing, and carrying out hydrothermal reaction to obtain an EuCo-MOF precursor; and (3) adding the EuCo-MOF precursor and thioacetamide into a solvent, and carrying out hydrothermal reaction, so that TAA releases S < 2->, and etching to obtain the rare earth metal doped transition metal electrocatalyst with a hollow spherical structure. According to the catalyst disclosed by the invention, atomic-scale Eu is doped in cobalt sulfide, so that the activity of the transition metal catalyst is effectively improved; the preparation method is simple and efficient.

The invention relates to a lithium iron phosphate material, a preparation method thereof and a lithium ion battery, hydroxyl iron phosphate and hydroxyl iron phosphate containing metal doping elements are respectively used as phosphorus and iron sources to prepare a precursor, the compaction density of the lithium iron phosphate material is effectively improved based on a four-level grain size distribution design, and meanwhile, the capacity is ensured to be efficiently exerted. When the lithium iron phosphate material is used for preparing a lithium ion battery, the energy density, the rate capability and the cycle life of the battery can be remarkably improved, the development requirements of high-end application markets such as long endurance of electric automobiles and high efficiency of energy storage systems are met, and the lithium iron phosphate material has a good industrial application prospect.

The invention discloses a catalyst applicable to preparation of methanol by hydrogenation of carbon dioxide and a preparation method of the catalyst, relates to the technical field of hydrogenation catalysts, and aims to solve the problems that active sites are few and sintering is easy at high temperature. The preparation method comprises the following steps: taking a Fe and Zn doped metal precursor and a main body Zr precursor as raw materials, preparing a gel catalyst intermediate product through a sol-gel method, carrying out supercritical drying, and then carrying out high-temperature calcination to prepare the Fe-Zn co-doped ZrO2 catalyst, and the activity of the Fe-Zn co-doped ZrO2 catalyst comes from rich oxygen vacancies and asymmetric active sites brought by metal doping; according to the invention, asymmetric active sites are constructed through metal doping to activate CO2, the prepared catalyst can realize more efficient reaction for preparing methanol through carbon dioxide hydrogenation at high space velocity in a high-temperature region, and the space-time rate of methanol can be directly increased by one order of magnitude.

A preparation method of an integrated thermal barrier ceramic coating with high strength and toughness / low thermal conductivity / anti-thermal radiation penetration belongs to the technical field of thermal barrier coating materials. The purpose of the present invention is to solve the problems that the anti-thermal radiation penetration thermal barrier coating materials prepared by the existing methods have precious metal second phases which are not only expensive but also have a large difference in thermal expansion coefficients between the metal-doped second phases and the ceramic matrix phases, resulting in the failure of thermal expansion matching of the materials at high temperatures, the metal-doped second phases have high thermal conductivities, which will increase the thermal conductivity of the composite materials and reduce their thermal protection effects during high-temperature service, and there are potential problems of interface failure in the multi-layer structure coatings. Method: First, surface pretreatment of the substrate; second, preparation of the bonding layer; third, preparation of the ceramic matrix phase components and the dispersed phase functional ceramic components; fourth, mixing and spherical granulation; fifth, preparation of the functional surface layer. The present invention can obtain an integrated thermal barrier ceramic coating with high strength and toughness / low thermal conductivity / anti-thermal radiation penetration.

The invention discloses a preparation method of an N-doped graphene-coated silicon-based negative electrode material, which comprises the following steps of: performing carbon coating by using graphene, controlling the particle size of a silicon substrate to be less than 2 microns, and realizing micro-nanocrystallization of a silicon main body material through mechanical ball milling, so that the micro-nanocrystallization silicon material is distributed in a graphite layer while metal-doped silicon monoxide obtains a smaller particle size; according to the preparation method, metal doped silicon monoxide is taken as a silicon source, the surface of the metal doped silicon monoxide is coated with the stripped graphene, the metal doped silicon monoxide is coated with the graphene oxide, finally, a silicon material is further uniformly coated with graphene micro-nanosheets by adopting a rapid spray drying technology, and an electroactive substance is effectively protected from being influenced by volume change caused in the charging and discharging process through the synergistic effect of the graphene micro-nanosheets. The preparation method has the advantages that after the composite material is prepared from micron-sized silicon monoxide and graphene, low-cost preparation of the modified silicon monoxide is realized, the electrode material with excellent electrochemical performance is obtained, the stability of the composite material is effectively improved, the cycle service life is prolonged, and the application and popularization value is relatively good.

Exemplary semiconductor processing methods may include depositing a metal-doped boron-containing material on a substrate disposed within a processing region of a semiconductor processing chamber. The metal-doped boron-containing material may include a metal dopant comprising tungsten. The substrate may include a silicon-containing material. The methods may include depositing one or more additional materials over the metal-doped boron-containing material. The one or more additional materials may include a patterned photoresist material. The methods may include transferring a pattern from the patterned photoresist material to the metal-doped boron-containing material. The methods may include etching the metal-doped boron-containing material with a chlorine-containing precursor. The methods may include etching the silicon-containing material with a fluorine-containing precursor. The metal dopant may enhance an etch rate of the silicon-containing material. The methods may include removing the metal-doped boron-containing material from the substrate with a halogen-containing precursor.

The invention belongs to the technical field of air purification, and discloses a nitrogen-doped MOF derived hollow porous carbon-rare earth metal doped MnO2-graphene aerogel composite material as well as a preparation method and application thereof. The preparation method provided by the invention comprises the following steps: taking a nitrogen-containing organic heterocyclic ligand, a nitrogen doping agent, a non-noble metal salt compound and chitosan, carrying out a first hydrothermal reaction, carrying out tannic acid etching and first calcination treatment, carrying out MnO2 in-situ growth on the obtained nitrogen-doped MOF derived hollow porous carbon material, and introducing a rare earth metal salt compound to obtain the nitrogen-doped MOF derived hollow porous carbon material. And finally, taking the obtained nitrogen-doped MOF derived hollow porous carbon-rare earth metal doped MnO2 composite material, graphene oxide and a reducing agent to carry out second hydrothermal reaction, ethanol soaking, freezing and freeze-drying treatment to obtain the nitrogen-doped MOF derived hollow porous carbon-rare earth metal doped MnO2 composite material. The nitrogen-doped MOF-derived hollow porous carbon-rare earth metal doped MnO2-graphene aerogel composite material has excellent adsorption and catalytic degradation activity on TVOC (Total Volatile Organic Compounds) such as formaldehyde and the like, and the composite material has a good application prospect in air purification.

The invention relates to an asphalt-based silicon-carbon composite material, a preparation method thereof and a lithium ion battery. The preparation method comprises the following steps: providing pitch coke, sodium hydroxide and lithium carbonate, uniformly mixing the raw materials, calcining in a nitrogen atmosphere, sequentially washing with mixed acid and deionized water after calcining, and carrying out vacuum drying to obtain pitch-based porous carbon; adding the pitch-based porous carbon into a vacuum furnace, and respectively introducing heteroatom gas, silane gas and metal compound gas in stages to obtain a metal-doped silicon-carbon precursor material; and heating the metal-doped silicon-carbon precursor material, introducing oxidizing mixed gas for passivation, soaking the passivated metal-doped silicon-carbon precursor material in an organic solvent of an organic lithium compound, uniformly mixing, and carrying out spray drying to realize secondary coating, thereby obtaining the asphalt-based silicon-carbon composite material. The asphalt-based silicon-carbon composite material has a three-layer core-shell structure, so that the stability and the performance of the material are improved, and the first efficiency and the power performance of the material can be improved.

The invention discloses an NF-loaded high-valence metal doped-high-entropy layered double hydroxide / MOF composite material, and belongs to the technical field of high-entropy catalysts. A two-step hydrothermal method is adopted, firstly, a metal organic framework material (MOF) precursor Ni-MOF is prepared through the hydrothermal method, then a metal salt solution containing iron, zinc, cerium, cobalt and the like is prepared at the room temperature, the solution is fully stirred and subjected to ultrasonic uniformization and transferred into a high-pressure kettle, the precursor Ni-MOF is added, and the metal salt solution containing iron, zinc, cerium, cobalt and the like is obtained. And carrying out hydrothermal treatment, washing and drying to obtain the high-valence metal doped high-entropy layered double hydroxide / MOF composite material loaded on foamed nickel (NF). According to the technical scheme, due to the synergistic effect of the MOF and the high-entropy LDH, the MOF / LDHs have excellent electrochemical performance, and the introduction of the high-valence metal can regulate an electronic structure and expose rich active sites, so that the electrocatalytic activity of the MOF / LDHs is improved, and excellent HER, OER and UOR activities are obtained.

The invention provides a Mn2O3 nano array and a preparation method and application thereof, and belongs to the field of composite material surface modification.The preparation method of the Mn2O3 nano array comprises the following steps that a manganese source and an organic ligand are dissolved in an organic solvent, and a first solution containing the manganese source and a second solution containing the organic ligand are obtained; adding the second solution into the first solution to obtain a mixed solution, then adding pretreated foamed nickel and a third solution containing water and ethanol into the mixed solution, and carrying out a hydrothermal reaction to obtain a Mn-MOF-coated NF composite material; the Mn-MOF-coated NF composite material is roasted to obtain a roasted material, and then the roasted material is soaked in a metal salt solution, washed and dried to obtain the metal-Mn2O3-coated NF nano array material. According to the preparation method disclosed by the invention, near-surface metal doping of Mn2O3 is realized through quenching treatment of the metal salt solution, the electrochemical energy storage performance of the Mn2O3 nano array material is remarkably improved, meanwhile, the production cost is reduced, and industrial production is facilitated.

The invention discloses a solid electrolyte-coated silicon-carbon composite material and a preparation method thereof, and is characterized in that a negative electrode material has a core-shell structure, the core is metal-doped porous carbon and nano silicon deposited in pores, and the shell is a solid electrolyte complex. The preparation method comprises the following steps: uniformly mixing an emulsifier, a phenolic compound, an aldehyde compound, a cross-linking agent, a metal salt of the cross-linking agent and a template agent, then adding an oxidizing agent for reaction, and preparing metal-doped porous carbon through heteroatom doping and activation; depositing nano silicon through a vapor deposition method, coating the surface of the nano silicon with a solid electrolyte through a liquid phase method, and carbonizing to obtain the solid electrolyte coated silicon-carbon composite material. The obtained material has the characteristics of excellent fast charging performance, high initial efficiency and the like when applied to lithium ion batteries.

The invention provides a preparation method for preparing a high-compaction lithium iron phosphate positive electrode material by utilizing double-iron-source composite grade matching. The preparation method comprises the following steps: adding ferrous sulfate and phosphoric acid into pure water, and fully mixing to obtain a solution; dividing the solution into a solution A and a solution B; adding a certain amount of a metal doping source material, an oxidizing agent and phosphoric acid into the solution A, and controlling the pH to be 1-3 to obtain iron phosphate; adding a certain amount of metal doped source material and ammonia water into the solution B, and controlling the pH to be 5-6 to obtain ferrous phosphate; the preparation method comprises the following steps: respectively sanding and spraying iron phosphate and ferrous phosphate with a lithium source, a carbon source and pure water according to a molar ratio to obtain a lithium iron phosphate yellow material A and a lithium iron phosphate yellow material B; calcining the yellow material A in a furnace to obtain a precursor A, calcining the yellow material B in the furnace to obtain a precursor B, mixing the precursor A and the precursor B according to a certain mass ratio, and calcining to obtain a finished product. The method is simple in technological process, can be combined with actual production, and is very effective for improving the compaction density and the electrical property.