9results about How to "Short diffusion path" patented technology

The present application relates to the technical field of molecular sieve, in particular to a kind of self-supporting MFI nanosheet molecular sieve and its preparation method and purposes, the preparation method of the self-supporting MFI nanosheet molecular sieve includes the following steps: 1) after mixing silicon source, aluminium source, alkali source, template agent and water, obtain gel mixture;2) the gel mixture obtained in step 1) is crystallized, i.e. the self-supporting MFI nanosheet molecular sieve is obtained;Wherein, the template agent is imidazolyl quaternary ammonium salt compound.The self-supporting MFI nanosheet molecular sieve prepared in the present application does not need expensive surfactant, no phosphorus species is left in channel after calcination, the range of silicon-aluminum ratio is wide, and it is simple and easy to repeat.

The invention belongs to the technical field of secondary battery negative electrode materials, and particularly relates to a silicon-based negative electrode material and a preparation method and application thereof. The silicon-based negative electrode material comprises a silica frame main body structure, doped metal elements and a surface carbon coating layer. The method comprises the following steps: mixing a silicon-based compound, a metal oxide, a template agent and water, stirring at high temperature, roasting and activating at high temperature to obtain a precursor, and performing surface carbon coating on the precursor to obtain the silicon-based negative electrode material. The negative electrode material is applied to preparation of lithium ion batteries and sodium ion batteries. The silicon-based negative electrode material is nanoparticles, has a relatively large outer surface area and relatively high surface activity and is more beneficial to storage of lithium ions and sodium ions, meanwhile, the nanoparticles have a shorter diffusion path in size and are beneficial to diffusion of the lithium ions and the sodium ions, and the conductivity of the electrode material can be improved by doping metal elements and coating the surface with carbon. The material has zero strain characteristic, high energy density and excellent cycle performance in lithium ion batteries and sodium ion batteries.

The invention discloses a three-dimensional chrysanthemum-shaped CoMoO4@Ni3V / NF heterostructure catalyst and a preparation method and application thereof, which belongs to the technical field of nanocomposite materials. The invention makes the electrocatalyst exhibit excellent HER performance by regulating structural engineering and interface engineering. The method of the invention adds Na2MoO4·2H2O, Co(NO3)2·6H2O, Ni(NO3)2·6H2O, NH4VO3, NH4F and urea into deionized water, stirs vigorously for at least 20 minutes, and ultrasonicates for at least 10 minutes to obtain a mixed solution; immerses the foamed nickel in the mixed solution, performs hydrothermal crystallization, cools naturally to room temperature, and washes with anhydrous ethanol and deionized water in turn. The three-dimensional chrysanthemum-shaped CoMoO4@Ni3V / NF electrocatalyst of the invention has an open structure and a shorter diffusion path, and the synergistic effect between the heterogeneous interface of CoMoO4 and Ni3V can promote charge transfer, accelerate the diffusion of ions and water, and quickly release hydrogen and oxygen, thereby improving the electrocatalytic performance.

The invention is applicable to the technical field of electrocatalysis, and provides a preparation method of a nitrogen-doped carbon nanotube (NCNT) packaged CoCu bimetallic electrocatalyst, which comprises the following steps: cleaning carbon cloth (CC); the preparation method comprises the following steps: dissolving Co (NO3) 2.6 H2O and CuCl2. 2H2O in deionized water, dissolving 2-methylimidazole in deionized water, mixing the two solutions, immersing a CC substrate in the mixed solution, and standing at room temperature; cleaning the obtained product, and drying the product to obtain CoCu-MOF / CC; and putting the CoCu-MOF / CC into a porcelain boat, putting the porcelain boat containing a melamine ethanol solution in front of the CoCu-MOF / CC, and heating and calcining to obtain the CoCu-coated NCNT / CC. The invention further provides the nitrogen-doped carbon nano tube packaged CoCu bimetallic electrocatalyst and application of the nitrogen-doped carbon nano tube packaged CoCu bimetallic electrocatalyst. According to the preparation method, MOF is selected as a template, CoCu-MOF grown on a CC substrate in situ is taken as a precursor, alloy particles are packaged in a carbon layer through a coating effect, so that agglomeration and corrosion of an alloy catalyst are effectively avoided, pyrolysis in-situ conversion is performed under the assistance of melamine, an electronic structure is adjusted, a reaction energy barrier is reduced, excellent activity and durability are realized, and OER catalytic activity is efficiently promoted.

A lithium-mediated electrochemical method for ammonia synthesis, relating to the field of ammonia synthesis technology, solves the technical problems of severe side reactions, limited nitrogen mass transfer, and poor interfacial stability in existing lithium-mediated ammonia synthesis systems. Tetra(4-formylphenyl)porphyrin iron and an amino-containing multifunctional organic ligand are added to a mixed solvent of n-butanol and o-dichlorobenzene. An acid catalyst is added, and after stirring until homogeneous, the mixture is degassed and sealed for reaction. The solid product is collected by centrifugation, washed, and dried to obtain COF powder. This powder is then added to an ethanol-water solution, followed by ultrasonic dispersion with Nafion solution. The powder is then drop-coated / sprayed onto the surface of a carbon paper current collector and dried. This powder is used as the working electrode, with a platinum mesh as the counter electrode, a platinum wire as the quasi-reference electrode, and a LiBF4 tetrahydrofuran solution as the electrolyte. Ethanol is used as the proton donor, and electrolysis is performed under a nitrogen atmosphere using a constant current. This invention can be applied to the field of ammonia synthesis technology.

The application discloses a kind of fast charging sodium ion battery hard carbon negative electrode material and preparation method thereof, its preparation method includes the following steps: S1, pretreatment: hard carbon raw materials are broken and sieved, and the hard carbon raw materials with particle size less than 3cm are obtained;S2, low-temperature carbonization: the hard carbon raw materials obtained in step S1 are low-temperature carbonized, and the hard carbon precursor is obtained;S3, crushing and shaping: the hard carbon precursor obtained in step S2 is crushed and treated, and the hard carbon precursor powder is obtained by crushing D50 to 3-200 μm;S4, wet grinding: the hard carbon precursor powder obtained in step S3 is wet sand ground to D50 0.1-3 μm, and the sand grinding slurry is obtained;S5, spray drying: the sand grinding slurry obtained in step S4 is spray dried, and the carbon intermediate is obtained;S6, high-temperature carbonization: the carbon intermediate obtained in step S5 is high-temperature sintered, and the fast charging hard carbon negative electrode material is obtained.The application has the characteristics of good rate performance, excellent fast charging performance and high cycle stability.

The invention discloses a high specific surface area nano FAU molecular sieve synthesis method, which comprises: 1) dissolving a silicon source, an aluminum source and an alkali source in water, and uniformly mixing in a premixing device to obtain a mixed solution A; standing and aging to obtain a guiding agent; 2) dissolving an alkali source and an aluminum source in water by taking a silicon source as a single material to obtain a mixed solution B; in premixing equipment, premixing a silicon source and the mixed solution B with the guiding agent prepared in the step 1) to form reaction initial gel; and 3) transferring the initial reaction gel in the premixing equipment into a crystallization kettle for hydrothermal crystallization reaction, taking out a product after the reaction is finished, filtering, washing and drying to obtain the FAU molecular sieve. The particle size of the nanosheet-shaped FAU molecular sieve is 20-450 nm, the specific surface area is 960-1100 m < 2 > / g, and the pore volume of mesopores is 0.1-0.8 cm < 3 > / g; more active sites can be provided, the diffusion path is shorter, and the molecular diffusivity can be improved.

The utility model discloses a single battery and relates to the technical field of batteries, the single battery comprises a shell, a first cover plate assembly, a second cover plate assembly, a first inner core, a second inner core and a separation structure, a liquid injection hole is formed in the side wall of the shell, the separation structure is arranged in the shell, and a first containing space is defined by the separation structure, the shell and the first cover plate assembly; the separation structure, the shell and the second cover plate assembly define a second containing space, the first inner core and the second inner core are arranged in the first containing space and the second containing space respectively, the separation structure is provided with a liquid passing channel, and the liquid injection hole communicates with the first containing space and the second containing space through the liquid passing channel; according to the technical scheme provided by the embodiment of the invention, the liquid injection hole is formed in the side wall of the shell, so that the electrolyte can uniformly permeate into the two inner cores, the consistency of the battery is improved, the output performance of the battery is optimized, and moreover, the diffusion path of the electrolyte is shorter and the liquid injection speed can be increased by forming the liquid injection hole in the middle of the shell.

The invention discloses a high-rate lithium ion battery graphite negative electrode material and a preparation method thereof. The high-rate lithium ion battery graphite negative electrode material is prepared by the steps of crushing petroleum coke particles, calcining at low temperature, graphitizing at high temperature, cooling, demagnetizing and the like. Through the synergistic effect of multiple processes of raw material crushing, low-temperature calcination and high-temperature graphitization, a large number of micropores and defects are introduced into a carbon matrix, and a shorter diffusion path and an isotropic ion transmission channel are provided for lithium ions; and the lithium ion battery graphite negative electrode material with better rate capability, cycling stability and dynamic performance is prepared.