13results about How to "Increase the active site" patented technology

This invention relates to a core-shell structured sodium iron phosphate pyrophosphate cathode material, its preparation method, electrode sheet, and battery, belonging to the technical field of methods or devices for directly converting chemical energy into electrical energy. The core-shell structured sodium iron phosphate pyrophosphate cathode material of this invention comprises primary particles, each primary particle including: a core, a sodium iron phosphate pyrophosphate shell layer disposed on at least a portion of the surface of the core, and a carbon coating layer located within the pores and on the surface of the sodium iron phosphate pyrophosphate shell layer; the core includes a NASICON-type sodium-ion inorganic solid electrolyte with an average particle size ≤50nm; the average thickness of the sodium iron phosphate pyrophosphate shell layer is ≤500nm; the chemical formula of the sodium iron phosphate pyrophosphate shell layer is Na₄Fe₂O₃. 3‑ x M x (PO4)2P2O7, 0≤x≤0.9, M is a doped metal element. The core-shell structured sodium iron phosphate pyrophosphate cathode material of this invention combines high solid density, high conductivity and good electrochemical performance.

The invention discloses a Fe / Cu-SAPO-11 adsorption carrier capable of adsorbing NH3 and resisting poisoning as well as a preparation method and application of the Fe / Cu-SAPO-11 adsorption carrier, and belongs to the field of environmental pollution control materials and technologies. The preparation method at least comprises the following steps: in the presence of a source containing aluminum, phosphorus and silicon, performing hydrothermal synthesis, calcining to obtain an SAPO-11 molecular sieve, and finally loading copper by an ion exchange method. And carrying out hydrothermal synthesis on iron oxide, and physically mixing the molecular sieve and the iron oxide to obtain the Fe / Cu-SAPO-11. The Fe / Cu-SAPO-11 prepared in the invention has a micron-scale spherical structure, and iron oxide loaded on the Fe / Cu-SAPO-11 has a regular hexagonal structure with a nano-scale size. Compared with the prior art, the method disclosed by the invention is simple to operate, easy for large-scale production, high in NH3 adsorption efficiency and good in sulfur resistance.

This invention discloses a five-layer electrodeposited high-sealing corrugated pipe based on ultrasound assistance and its preparation method, belonging to the technical field of metal corrugated pipe manufacturing. It aims to solve the problem that in multi-layer electrodeposited corrugated pipes, it is difficult to effectively coordinate current density, surface quality, and interfacial bonding strength, leading to insufficient densification of the deposited layer, unstable interlayer bonding, poor wall thickness uniformity, and failure to meet airtightness standards, ultimately resulting in poor overall performance stability. This invention includes a five-layer composite structure in which the pipe wall is composed of alternating nickel-cobalt alloy and copper layers. Each layer of the five-layer composite structure undergoes ultrasonic vibration treatment during deposition. The corrugated pipe prepared by this invention has a uniform and dense deposited layer with good interlayer bonding. The five-layer alternating deposition layer composite structure not only achieves uniform stress transmission and dispersion, effectively delaying crack propagation and interfacial penetration, but also improves the uniformity of wall thickness distribution, enabling the corrugated pipe to exhibit higher structural stability and long-term reliability in a sealed environment.

This invention discloses a method for preparing and applying chitosan-encapsulated CoCe layered double hydroxide CoCe-LDH. This material can achieve rapid and efficient degradation of roxarsone and removal of the resulting inorganic arsenic. In this material, LDH is encapsulated by chitosan, resulting in a sheet-like material. Chitosan can disperse active sites and adsorb and enrich PMS, while LDH can transfer PMS ions into the anion layer through anion exchange, thereby increasing the active sites. After coupling with the material, PMS is specifically converted to... 1 O2 accelerates the degradation rate.

This invention provides a method for preparing a modified konjac emulsifier, relating to the field of konjac processing, comprising: step S1, pretreatment; step S2, preparation of precursor solution; step S3, segmented deacetylation; step S4, preparation of gel particles; step S5, hydrophobic anchoring pretreatment; step S6, graded enzymatic esterification; and step S7, purification and drying. This method, through multiple modifications of konjac glucomannan, obtains a modified konjac emulsifier, effectively solving the problems of strong hydrophilicity and poor emulsifying properties of konjac glucomannan.

The application discloses a CO-SCR catalyst, a preparation method and application thereof, and the CO-SCR catalyst comprises a cerium-based composite oxide carrier and a noble metal active component, and the noble metal active component is dispersed on the surface of the cerium-based composite oxide carrier by means of a surfactant. The CO-SCR catalyst utilizes the dispersion and loading of the noble metal assisted by the surfactant, so that the CO-SCR catalyst has higher metal dispersion and redox capacity. Meanwhile, the suitable pH value of the carrier surface is also beneficial to the adsorption of CO and NO, and the low-temperature catalytic activity and high-temperature stability of the catalyst are improved, and the CO-SCR catalyst has higher catalytic activity and nitrogen selectivity in the use temperature range of 250 DEG C to 400 DEG C.

The application discloses a high-strength and high-plasticity multi-level mixed heterogeneous structure titanium-based composite material and a preparation method thereof, and the method comprises the following steps: firstly, alumina nanoparticles and amorphous pyrolytic carbon are respectively subjected to activity adjustment and surface modification; secondly, the alumina nanoparticles with high defects and high activity are subjected to pre-coating treatment together with titanium-based powder; thirdly, the surface-modified high-activity amorphous pyrolytic carbon particles are subjected to low-energy ball milling coating together with the pre-coated alumina nanoparticles and the single-level core-shell structure titanium-based powder; and finally, high-strength and high-plasticity multi-level mixed heterogeneous structure titanium-based composite material is obtained through low-temperature short-time large-pulse current plasma sintering. In the application, the alumina nanoparticles and the amorphous pyrolytic carbon are used as the reinforcing phase precursors, and after the activity adjustment and the surface modification, the two are coated on the titanium-based powder in sequence to form the multi-level coated core-shell structure titanium-based powder, and a plurality of kinds of reinforcing phase mixed heterogeneous structures are generated in situ and solid-solution-diffused and precipitated through sintering, so that the strength and plasticity matching performance of the titanium-based composite material is significantly improved.

The invention relates to the technical field of electrochemistry, in particular to a ruthenium / nickel-iron alloy co-embedded carbon fiber material and a preparation method and application thereof. The ruthenium / nickel-iron alloy co-embedded carbon fiber material catalyst is prepared through an electrostatic spinning-carbonization-reduction method, firstly, nanofibers are obtained through electrostatic spinning, active substances can be embedded into the carbon nanofibers through the electrostatic spinning technology, agglomeration of nanoparticles is effectively inhibited, meanwhile, corrosion resistance is improved, and the catalyst is used for preparing the carbon fiber material. The preparation method comprises the following steps: firstly preparing carbon nanofibers, then performing high-temperature carbonization to obtain Ni3Fe-CNFs, enabling the carbon nanofibers to have good electrical conductivity, facilitating electron transfer and charge transfer, and finally loading Ru onto the surfaces of the carbon nanofibers by adopting a sodium borohydride reduction method, so that the HER reaction process is greatly accelerated.

This invention discloses an aminated graphene oxide-based bipolar membrane and its preparation method, belonging to the field of bipolar membrane technology. The bipolar membrane is composed of a sulfonated polyphenylene sulfone cation layer, an aminated graphene oxide interlayer, and a quaternized polyphenylene ether anion layer stacked sequentially. This invention utilizes the aminated graphene oxide as the interlayer, taking advantage of its two-dimensional sheet-like morphology, abundant catalytic groups, and cross-linking effect to achieve a bipolar membrane with low water dissociation voltage, good interlayer compatibility, and structural stability. When applied to electrodialysis, it improves alkali concentration and current efficiency compared to commercially available membranes, while reducing energy consumption, showing promising application prospects in acid and alkali preparation, resource recovery, and other fields.

This invention belongs to the field of capacitor technology and discloses a composite activated carbon, its preparation method, and its application. The composite activated carbon comprises activated carbon and graphene generated in situ. When the composite activated carbon of this invention is used to prepare supercapacitor electrodes, the prepared electrodes have high specific capacitance and high volumetric specific capacitance.

The application relates to the technical field of heavy metal ion detection, in particular to a nitrogen-doped graphene modified paper-based electrode and a preparation method and application thereof. The preparation method provided by the application comprises the following steps: providing filter paper, the filter paper has a hydrophobic region and a non-hydrophobic region, and the surface of the hydrophobic region is provided with a hydrophobic barrier; printing a three-electrode system and a conductive pad on the surface of the filter paper to obtain a paper-based electrode, the three-electrode system comprises a working electrode, a counter electrode and a reference electrode; mixing an ammonium chloride and ammonia water mixed solution and an oxidized graphene solution to obtain an electrolyte; and dropping the electrolyte on the paper-based electrode to perform electrochemical deposition, thereby obtaining a nitrogen-doped graphene modified paper-based electrode. The preparation method is simple in operation and mild in conditions, and the nitrogen-doped graphene electrode prepared by the method has strong anti-interference performance, low detection limit and high sensitivity when simultaneously detecting Cd 2+ , Pb 2+ and Hg 2+ three ions in a water environment.

This invention relates to the field of waste lithium battery recycling technology, specifically disclosing a method for high-value recycling of lithium cobalt oxide battery cathode materials. The method includes the following steps: adding oxalic acid, hydrogen peroxide, and nano-zirconia to the fully discharged and de-aluminum-foil-removed lithium cobalt oxide cathode material, and grinding it in a zirconia ball mill; after grinding, leaching and filtration to separate cobalt oxalate residue and lithium-containing filtrate; adding potassium fluoride to the filtrate to convert it into lithium fluoride, and then regenerating the oxalic acid using Amberlyst-15 ion exchange resin for recycling. This method achieves efficient separation, high-purity recovery, and is economical and environmentally friendly through the synergistic effect of mechanical and chemical action and reagent regeneration technology, providing a feasible path for the high-value recycling of lithium cobalt oxide battery cathode materials.

The application discloses a two-dimensional flexible material compounded by vanadium oxyphosphate and MXene and a preparation method and application thereof, and belongs to the technical field of functional nanomaterial preparation. The application first prepares multilayer vanadium oxyphosphate through a hydrothermal method, then fully mixes vanadium oxyphosphate which is stripped through a liquid phase with MXene and polyacrylonitrile to prepare a spinning liquid, adopts an electrostatic spinning method to obtain a polymer fiber film doped with vanadium oxyphosphate nanosheets, and further carries out calcination and carbonization treatment in an ammonia atmosphere to obtain a flexible porous vanadium-based nanofiber film material. The vanadium oxyphosphate film material prepared by the method has physical properties of rich active sites, high conductivity, sufficient ion transmission channels, good flexibility and excellent self-supporting structure, has the advantages of high activity, high capacity and high stability in energy storage application, and has an excellent application prospect. The preparation process of the application is simple, energy consumption is low, and the application is suitable for industrial large-scale production.