19results about How to "Many reactive sites" patented technology

The invention discloses a three-dimensional network carbon nanofiber loaded iron-based material and application of the three-dimensional network carbon nanofiber loaded iron-based material to ammonia synthesis through electro-catalysis of nitrate radicals, an obtained catalytic system comprises a three-dimensional network carbon nanofiber carrier and uniformly distributed iron nanoparticles, and three-dimensional network carbon nanofibers have ultra-light density and ultra-high specific surface area; and the loaded iron nanoparticles play a role in connecting the carbon nanofibers, so that the electron conduction of the catalytic system is accelerated, and abundant reaction active sites are provided. The invention provides an efficient non-noble metal catalyst for electrocatalytic synthesis of nitrate ammonia, can simultaneously realize super-high yield and Faraday efficiency under large current, and has great significance in promoting development of electrocatalytic synthesis ammonia technology and promoting global nitrogen cycle.

The invention discloses a preparation method of a nickel-based bimetallic multifunctional catalyst, which comprises the following steps: firstly, carrying out simple thiocyanate bridging coordination reaction to obtain a thiocyanate bridging complex precursor DMG-SCN-NiCo-Tu, and then carrying out high-temperature calcination to obtain a nickel-cobalt oxide nano catalyst NiCoO. The nickel-cobalt oxide nano catalyst NiCoO is a high-activity nickel-based bimetallic multifunctional catalyst. The preparation method is simple, dimethylglyoxime DMG and nickel-cobalt bimetallic coordination is achieved, meanwhile, the catalytic activity of the nickel-based catalyst is enhanced through introduction of the second metal Co, the prepared nickel-based bimetallic multifunctional catalyst has the large specific surface area and rich reaction active sites, the catalytic activity of the catalyst is remarkably enhanced, and the catalyst has the good application prospect. The problems of low electro-catalysis reaction activity and poor selectivity of a nickel-based single metal catalyst are solved, and the nickel-based single metal catalyst can be used as a catalyst for electro-catalysis nitrate reduction and urea oxidation.

The invention belongs to the technical field of flow batteries, and provides a pre-oxidized fiber felt modification method for improving the performance of an electrode carbon felt and the electrode carbon felt.The pre-oxidized fiber felt modification method comprises the steps that UiO-66 powder is added into a spinning solution, stirring and heating are conducted after mixing, a spinning solution is obtained, electrostatic spinning is conducted on the spinning solution, and a fiber felt is obtained; sequentially carrying out pre-oxidation, carbonization and surface activation treatment on the fiber felt to obtain an activated carbon felt; dispersing carbon dot powder in a dopamine solution to obtain a modified carbon dot dispersion liquid, soaking the activated carbon felt in the modified carbon dot dispersion liquid, taking out and drying, and performing high-temperature carbonization to obtain a modified carbon felt; uniformly mixing manganese sulfate, potassium permanganate and deionized water to obtain a reaction solution, transferring the reaction solution into a hydrothermal reaction kettle, soaking the modified carbon felt into the reaction solution for hydrothermal reaction, taking out the modified carbon felt after the reaction is finished, and washing and drying the modified carbon felt.

The application belongs to the technical field of photocatalytic materials, and particularly relates to a manganese ferrite / bismuth tungstate heterojunction photocatalyst and a preparation method and application thereof. The preparation method comprises the following steps: 1) dissolving sodium tungstate dihydrate, bismuth nitrate pentahydrate and cetyltrimethylammonium bromide in deionized water, and obtaining bismuth tungstate by using a hydrothermal method; 2) dissolving iron chloride hexahydrate and manganese chloride tetrahydrate in water, adding sodium hydroxide solution, and obtaining manganese ferrite by using a hydrothermal method; 3) dissolving the bismuth tungstate and the manganese ferrite into a sodium hydroxide solution, and then stirring and drying to obtain the manganese ferrite / bismuth tungstate heterojunction photocatalyst. The formation of the heterojunction can greatly improve the activity of the manganese ferrite / bismuth tungstate in photocatalytic reduction of carbon dioxide.

This invention belongs to the field of photocatalytic materials technology, specifically relating to a zinc gallate / semi-metallic carbon nitride heterojunction photocatalyst, its preparation method, and its application. The mass ratio of zinc gallate to semi-metallic carbon nitride heterojunction photocatalyst is 1:2 to 2:1. The preparation method includes: dissolving zinc acetate and gallium nitrate hydrate in deionized water, then adding citric acid monohydrate, and obtaining zinc gallate using a sol-gel method; dissolving sodium tricyanamide and 1-butyl-3-methylimidazolium chloride in water, and obtaining semi-metallic carbon nitride using a thermal polymerization method; and dissolving zinc gallate and semi-metallic carbon nitride in a deionized aqueous solution, and obtaining the zinc gallate / semi-metallic carbon nitride heterojunction photocatalyst using a hydrothermal method. The formation of the heterojunction can significantly improve the photocatalytic reduction activity of carbon dioxide by zinc gallate / semi-metallic carbon nitride.

The application belongs to the technical field of photocatalytic decomposition of water to produce hydrogen, and relates to preparation of a photocatalyst, in particular to a thin-wall hollow ZnO ball material and a preparation method and application thereof. PVP, salicylic acid and zinc acetate dihydrate are added into an organic solvent according to a mass ratio of 1:0.35-0.30:0.20-0.25, uniformly mixed, and then heated to 150-170 DEG C to perform a solvothermal reaction, and the product of the solvothermal reaction is calcined under an air atmosphere, and the thin-wall hollow ZnO ball material is obtained. The thin-wall hollow ZnO ball material can improve its specific surface area to provide more surface active sites, promote photocatalytic decomposition of water to produce hydrogen, and the hollow ball material can improve light utilization due to its wide internal space, thereby improving photocatalytic activity.

The application discloses a preparation method of Cu / PDI composite material, which comprises the following steps: step 1, 0.3993g Cu(CH3COO)2.H2O is added into 21mL DMF aqueous solution with a volume fraction of 14%-100%, and stirring is conducted to completely dissolve the Cu(CH3COO)2.H2O, so as to obtain solution A; step 2, 1g PVP is added into the solution A, initial stirring is conducted, then 3.993-35.937mg PDI is added, and continuous stirring is conducted, so as to obtain solution B; and step 3, the solution B is transferred into a polytetrafluoroethylene reaction kettle, the reaction kettle is placed into a drying box, reaction is carried out at 140-180 DEG C for 5-8h, the reaction kettle is cooled to room temperature, and the product C is collected, and then washing and vacuum drying are sequentially conducted, so as to obtain the Cu / PDI composite material, the near-infrared light absorption intensity of the Cu / PDI composite material is enhanced, and the Cu / PDI composite material has excellent photocatalytic activity.

The invention discloses a preparation method of core-loaded T-Nb2O5 coated Si skin-core structure carbon fiber, which specifically comprises the following three steps: carrying out surface hydroxylation treatment on nano silicon powder, preparing a niobium pentoxide coated nano silicon structure and preparing niobium pentoxide coated silicon skin-core structure carbon nanofiber. According to the core-loaded T-Nb2O5-coated Si skin-core structure carbon fiber obtained by the preparation method, the surfaces of the nano silicon particles are coated with T-Nb2O5, the volume expansion of silicon is limited by utilizing the structural stability of the T-Nb2O5, the cycle stability and the rate capability of a modified silicon negative electrode are remarkably improved while the high discharge specific capacity is ensured, and the service life of the modified silicon negative electrode is prolonged. And the application of the lithium ion battery cathode in the lithium ion battery cathode is beneficial to improving the energy density of the battery, prolonging the endurance life of electric equipment, and further promoting the popularization of electric automobiles, thereby reducing the use of fossil fuel and carbon emission.

The invention relates to the technical field of lithium ion batteries, and particularly discloses carbon-coated lithium iron phosphate and a preparation method thereof. Comprising the following steps: taking Prussian blue as a carbon source and an iron source, mixing a lithium source, a phosphorus source, Prussian blue and a dispersing agent in water, and performing ball milling to obtain a precursor; and calcining the precursor in a protective atmosphere to obtain the carbon-coated lithium iron phosphate. Prussian blue is used as an iron source and a carbon source at the same time, secondary sintering or additional carbon source adding is not needed, one-time sintering forming is achieved, the process is simple, and operation is easy. The carbon-coated lithium iron phosphate provided by the invention has excellent rate capability and long cycle performance, and can meet the requirements of high energy and high power output.

The application discloses a honeycomb porous carbon / nickel-iron double hydroxide / foamed nickel photoanode and a preparation method thereof. The nickel-iron double hydroxide is prepared by calcination with nickel nitrate, iron nitrate, ammonium fluoride and urea as raw materials. The photoanode is prepared by mixing and stirring different quality raw materials and calcination. The preparation method comprises the following steps: F1, grinding dried pomelo skin into powder, and obtaining honeycomb porous carbon through high-temperature carbonization; F2, drying the product after washing with ultrapure water and ethanol respectively, mixing, dissolving in water, and placing the high-pressure reaction kettle into a hydrothermal furnace for calcination at a certain temperature, and the collected product is the honeycomb porous carbon / nickel-iron double hydroxide / foamed nickel photoanode. The prepared photoanode has the advantages of large specific surface area, many active sites, fast photo-generated carrier separation and migration rate, high photocatalytic activity and high stability, thereby promoting the improvement of photoelectrocatalytic performance.

The invention provides a Fe-Mn bimetallic loaded supramolecular carbon nitride photocatalyst, a preparation method thereof and application of the Fe-Mn bimetallic loaded supramolecular carbon nitride photocatalyst in uranium-containing wastewater treatment, and belongs to the technical field of radioactive element treatment. According to the catalyst, iron (Fe) and manganese (Mn) are loaded on the surface of a supramolecular carbon nitride material to form a composite material with excellent photocatalytic activity. In the preparation process, firstly, the supramolecular carbon nitride substrate is synthesized through a solvothermal method, then Fe and Mn bimetals are loaded, and the photocatalytic performance of the catalyst is enhanced through calcination and surface modification. In the uranium-containing wastewater treatment process, the photocatalyst can effectively adsorb uranium ions and reduce the uranium ions under the irradiation of visible light, and the uranium removal effect is remarkable. The catalyst not only has a good uranium removal rate (gt; 99%), but also shows excellent ion interference resistance, stability and cyclic utilization.

This invention discloses a crystalline polyimide / polyimide composite material, its preparation method, and its applications. The method involves first uniformly mixing phenylhexacarboxylic acid trihydride with a diamine monomer, followed by a solid-phase reaction under argon atmosphere protection. After the reaction, the product is immersed in a polar solvent to obtain crystalline polyimide. Then, the crystalline polyimide is added to an organic solution of polyamic acid, subjected to ultrasonic treatment in an ice-water bath, and subsequently thermosetting to obtain the crystalline polyimide / polyimide composite material. The crystalline polyimide in this composite material has a layered two-dimensional COF structure, giving it relatively high thermal conductivity, heat resistance, and high-temperature mechanical properties. Introducing the crystalline polyimide into the polyamic acid solution utilizes the special interfacial compatibility between the amino groups in the crystalline polyimide and the anhydrides in the polyamic acid to react, solving the problem of difficult processing and effectively expanding its application range.

The invention discloses a manufacturing method of an electrochemical sensor based on a modified glassy carbon electrode. The manufacturing method comprises the following steps: step 1, preparing Ag2O nanoparticles; step 2, preparing Ag2O printing ink according to a product obtained in the step 1; step 3, preparing an MXene nanosheet; 4, preparing MXene printing ink according to a product obtained in the step 3; and step 5, sequentially dispensing the MXene ink obtained in the step 4 and the Ag2O ink obtained in the step 2 on a GC electrode to prepare an Ag2O-MXene modified GC working electrode, and then selecting a corresponding counter electrode and a reference electrode to form the electrochemical sensor. The invention further discloses an electrochemical sensor based on the modified glassy carbon electrode. The problems that an existing electrochemical sensor is easily interfered by bacteria in a 4-NP detection environment and is low in sensitivity, poor in stability and high in cost are solved.

The application relates to a preparation method of a topological transformation indium hydroxide nanosheet photocatalyst. Indium sulfide is prepared through a hydrothermal method; the indium sulfide is added into ultrapure water, sodium hydroxide is further added, the solution is fully stirred, and a hydrothermal reaction is performed on the solution to obtain orange precipitates; the obtained orange precipitates are washed and vacuum dried to obtain the topological transformation indium hydroxide nanosheet photocatalyst. The topological transformation indium hydroxide nanosheet photocatalyst is applied to degradation of antibiotics under visible light. The method has the beneficial effects that: the indium hydroxide is synthesized through topological transformation of indium sulfide, has stronger visible light absorption capacity, can accelerate separation and migration of photo-generated electron-hole pairs while providing more reaction active sites, makes the catalyst exhibit good catalytic performance, degrades tetracycline under visible light, and the degradation rate is obviously better than that of the indium sulfide, and the method has great development potential in the field of environmental remediation, and the preparation method is simple, the conditions are easy to control, and the method is green and environment-friendly.

The invention discloses a crystalline polyimide / polyimide composite material as well as a preparation method and application thereof, the method comprises the following steps: firstly, uniformly mixing benzenehexanoic acid trianhydride and a diamine monomer, then carrying out solid-phase reaction under the protection of argon atmosphere, and after the reaction is finished, putting a product into a polar solvent for soaking treatment to prepare crystalline polyimide; then adding the crystalline polyimide into an organic solution of polyamide acid, carrying out ultrasonic treatment in an ice-water bath, and then carrying out thermocuring to prepare the crystalline polyimide / polyimide composite material. Crystalline polyimide in the composite material is of a layered two-dimensional COFs structure, so that the composite material has relatively high heat conductivity coefficient, heat resistance and high-temperature mechanical property, the crystalline polyimide is introduced into a polyamide acid solution, and a reaction is performed by utilizing the special interface compatibility of amino in the crystalline polyimide and anhydride in polyamide acid, so that the composite material is obtained. And the problem of difficulty in processing can be solved, and the application range is effectively expanded.

This invention discloses a composite separator, its preparation method, and its applications, belonging to the field of new energy materials technology. The composite separator provided by this invention includes a substrate layer and a composite coating disposed on at least one surface of the substrate layer; the composite coating includes a two-dimensional amorphous nanoscale filler, comprising a first filler, a second filler, and a third filler; the first filler is boron nitride; the second and third fillers are independently selected from at least one of MoS2, WS2, V2O5, MoSe2, MXene, graphene, and TiS2; and the second and third fillers are different. The composite separator provided by this invention exhibits excellent electrolyte wettability, puncture resistance, heat shrinkage resistance, and mechanical strength. This invention also provides a preparation method and applications of the above-mentioned composite separator.

The invention discloses an alumina ceramic ball with a communicated micropore structure and a preparation method and application thereof, and relates to the technical field of catalyst carriers. The ceramic ball takes aluminum oxide as a main raw material, and the content of the aluminum oxide is greater than or equal to 90wt%; mutually communicated micropores are formed in the ceramic ball, the diameter of the micropores is 0.1-2 microns, and the aperture deviation is less than or equal to 15%; the specific surface area of the ceramic ball is greater than or equal to 300m < 2 > / g, the porosity is 30-50%, and the compressive strength is The ceramic ball successfully realizes ideal combination of a high specific surface area and a high strength characteristic, and provides a huge loading space and rich reaction active sites for a catalyst; meanwhile, the compressive strength can still be kept at 150 MPa or above, and the porosity is 30%-50%, which shows that the material has an extremely high specific surface area, the skeleton structure is still compact and firm, and the common technical contradiction of low strength caused by high porosity of a porous material is effectively overcome.

The preparation method of the nitrate reduction electrocatalyst disclosed by the invention comprises the following steps: preparing a copper complex precursor, preparing a nitrogen and sulfur double-doped carbon loaded copper nanosheet Cu / NSC, and preparing a nitrogen and sulfur double-doped carbon loaded copper oxide nanosheet catalyst CuO / NSC. A copper complex precursor is obtained through a simple coordination reaction, and the copper oxide nanosheet catalyst is obtained through high-temperature calcination. The preparation method is simple, and realizes coordination of dimethylglyoxime and Cu < 2 + >. Meanwhile, the prepared copper oxide nanosheet catalyst has a relatively large specific surface area and rich reaction active sites, has remarkable activity on nitrate reduction reaction, has high stability, and solves the problem that a Cu-based electrocatalyst is inactivated due to passivation, leaching and corrosion after being used for a long time. Meanwhile, due to introduction of the carbon carrier, the enrichment effect of the catalyst on NO3 <-> and an intermediate is enhanced, and the rate of nitrate reduction reaction is increased.

The invention provides an ellipsoidal polyhedral MOF (Metal Organic Framework) derived phosphide as well as a preparation method and application thereof, and relates to the technical field of electro-catalytic materials. The preparation method comprises the following steps: mixing soluble cobalt salt, 2-methylimidazole and an alcohol solvent for a coordination reaction, and mixing an obtained solution containing a Co-MOF material with soluble rhenium salt for a solvothermal reaction to obtain a Re-Co-MOF material; the Re-Co-MOF material is subjected to in-situ phosphorization, and the ellipsoidal polyhedron-shaped MOF derivative phosphide is obtained. Re atoms are introduced into the Co-MOF-derived phosphide Co2P, the catalytic microenvironment of the Co2P can be adjusted, the electronic structure of the Co2P can be adjusted and controlled, the conductivity of the Co2P is improved, meanwhile, the surface potential energy in the synthesis process of the Co2P is adjusted and controlled, the morphology of the Co2P is optimized, and then the catalytic activity of the Co2P is improved. The MOF derivative phosphide prepared by the invention has excellent water electrolysis hydrogen / oxygen evolution activity and full hydrolysis electrocatalytic activity.