25results about How to "Increase active sites" patented technology

This invention belongs to the field of hard carbon technology, specifically relating to a bamboo-based and lignin-based hard carbon composite material, its preparation method, and its applications. The process involves pretreating raw materials to obtain pretreated material; pretreating the pretreated material with an acidic oxidant to obtain acidic oxidant pretreated material; pre-oxidizing the acidic oxidant pretreated material to obtain pre-oxidized material; pre-carbonizing the pre-oxidized material under a protective atmosphere to obtain pre-carbonized material; pulverizing the pre-carbonized material to obtain pulverized material; acid washing followed by water washing to obtain purified material; soaking the purified material in acid, filtering, and drying to obtain soaked material; mixing the soaked material with a modifier, and high-temperature coating and carbonizing under a protective atmosphere to obtain bamboo-based coated hard carbon or lignin-based coated hard carbon. Mixing the two types of hard carbon and carbon coating yields a bamboo-based and lignin-based hard carbon composite material, which is used in negative electrode sheets and batteries. When applied to batteries, the hard carbon composite material of this invention can improve battery energy density.

The application provides a composite metal sodium negative electrode material, a preparation method thereof and a sodium metal battery. The composite metal sodium negative electrode material comprises a porous organic film skeleton, an alloy type conductive sodium-philic layer and sodium metal filled in the pores inside the porous organic film skeleton. The application takes the porous organic film skeleton as a base material, constructs a three-dimensional flexible skeleton, and deposits the alloy type conductive sodium-philic layer on the porous organic film skeleton, so that the active sites for sodium ion deposition are increased and the rapid transmission of sodium ions is promoted.

The application relates to the technical field of catalyst materials, in particular to a preparation method and application of a catalyst for synthesizing dimethyl carbonate from carbon dioxide and methanol; the method comprises the following steps: A, poloxamer is configured into a solution, HAc, NaClO4 and 1,3,5-trimethylbenzene are added into the solution and uniformly mixed to obtain a mixture; B, (NH4)2Ce(NO3)6 and H2BDC are added into the mixed solution in step A, the obtained solid after reaction is centrifugally separated, washed, soaked and dried to obtain a primary product, and finally the catalyst is obtained through calcination; in the application, HF-UiO-66 is synthesized by taking F127 as a template agent and taking 1,3,5-trimethylbenzene (TMB) as an expanding agent; the derivative HF-CeO2 catalyst with different TMB adding amounts is prepared through calcination; the adding of the expanding agent greatly increases the specific surface area of the catalyst, the CeO2 crystal grains generated through calcination are small, the number of acid-base sites is greatly increased, and therefore the catalyst has the largest catalytic activity, and the DMC yield reaches 12.02 mmol DMC / g cat .

The application discloses a preparation method of a polymyxin B sulfate dry powder and belongs to the technical field of medicine preparation. The preparation of the polymyxin B sulfate dry powder is that the polymyxin B sulfate fermentation liquor is subjected to adsorption filtration by using a ZIF-8@polyurea / polyether sulfone composite membrane, and the filter cake is subjected to elution by using a sulfuric acid aqueous solution. The eluate is post-treated to obtain the polymyxin B sulfate dry powder. The application has the advantages of mild preparation condition, simple process, low reaction energy consumption and industrial application prospect.

The invention discloses a lithium ion battery pole piece, the pole piece comprises a current collector, at least one surface of the current collector is provided with an active material layer, and the surface of the active material layer is provided with a groove. According to the pole piece disclosed by the invention, by arranging the surface grooves, active sites and lithium ion diffusion channels of the negative electrode on the surface of the pole piece are increased, so that the active substance layer can be fully infiltrated by electrolyte, and lithium precipitation is improved.

The present application relates to a seaweed residue-based electrochemical biosensor and a preparation method thereof, which uses seaweed residue as raw material and chitosan as crosslinking agent, and prepares carbon aerogel CAs through sol-gel, vacuum freeze-drying and high-temperature carbonization process, and uses the CAs modified electrode (CAs / GCE) for DA detection. The present application uses high-temperature pyrolysis of nitrogen in seaweed residue to increase the disorder of C in CAs, which can effectively increase the active sites for dopamine detection and improve the electrochemical detection activity of the sensor for DA. CAs do not contain substances harmful to organisms or polluting to the environment, which not only solves the problems of high cost and limited application range of other raw materials, but also solves the problems of high value-added development and utilization of waste seaweed residue.

The invention belongs to the technical field of hard carbon materials, and particularly relates to a preparation method and application of a polyurethane-based hard carbon material. The preparation method comprises the following steps: carrying out roasting carbonization and post-treatment on a solid polyurethane material at 900-1400 DEG C to obtain a powdery polyurethane-based hard carbon material; the solid polyurethane material is a polyurethane product prepared from reaction raw materials including isocyanate, non-phosphorus-containing polyol and phosphorus-containing polyol through a reaction. According to the invention, the polyurethane material is prepared by adding the phosphorus-containing polyol, and the polyurethane material is applied to the field of batteries as a negative electrode raw material, so that high carbonization yield can be maintained, and excellent performances such as initial coulombic efficiency, energy density, cycle capacity retention rate and the like of the battery can be realized.

The invention discloses a TEMPO-based oxidation modified hard carbon paper negative electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out TEMPO oxidation pretreatment on cellulose paper pulp, and molding the obtained oxidized cellulose into raw paper through a wet papermaking process; and performing high-temperature carbonization treatment on the raw paper in a protective atmosphere to obtain the hard carbon paper negative electrode material. The obtained hard carbon paper negative electrode forms rich nanoscale sodium storage active sites after being carbonized, the platform capacity proportion is successfully increased to about 80%, the sodium storage characteristic close to the whole platform is achieved, and the energy density of the sodium ion battery is remarkably improved. In addition, the platform capacity of 250.1 mAh / g can still be achieved under the ultrahigh loading capacity (13.3 mg / cm < 2 >). Meanwhile, the integrated electrode structure does not need an additional current collector, an adhesive and a conductive agent, and shows excellent electrochemical performance and industrial application potential.

The application discloses doped porous carbon and a preparation method and application thereof. The doped porous carbon has a black powder-like morphology, a layered structure with a majority of micropores and mesopores, and a structure feature of dispersed heteroatoms on a material surface; a specific surface area is 50-1500 m 2 / g; doped with single-atom dispersed boron atoms and single-atom dispersed nitrogen atoms, a doping amount of the boron atoms is 0.01-10 wt% of a unit sample mass, and a doping amount of the nitrogen atoms is 0.01-10 wt% of the unit sample mass. The preparation method has simple process, mild conditions, low energy consumption, short cycle, good mixing dispersity, high performance, simultaneously introduces a carbon source, a nitrogen source and a boron source, and completes boron doping, boron and nitrogen co-doping and synthesis of a product in one step. By changing the dosages of the nitrogen source and the boron source, the doping amount, the internal pore structure and the specific surface area of the carbon material can be adjusted, and the carbon material exhibits good performance in a thermal catalytic reaction represented by EDC cracking.

This invention discloses a method for preparing a carbon-coated manganese oxide / manganese sulfide composite cathode material. First, manganese dioxide nanotubes are prepared using a hydrothermal method. Then, the manganese dioxide nanotubes are completely or partially sulfided to obtain manganese oxide / manganese sulfide. Next, a conductive polymer is coated onto the surface of the manganese oxide / manganese sulfide nanoparticles. Finally, the resulting manganese oxide / manganese sulfide nanoparticles with the conductive polymer coating are placed in a tube furnace and treated at high temperature for a certain period of time to obtain the carbon-coated manganese oxide / manganese sulfide composite cathode material. This carbon-coated manganese oxide / manganese sulfide nanocomposite material, as a cathode material for zinc-ion batteries, avoids direct contact between the electrolyte and the active material due to the carbon coating, preventing material dissolution and improving cycle life. The heterogeneous structure of manganese oxide / manganese sulfide enhances the electrochemical activity of the material, solving the problem of poor conductivity in traditional manganese oxide materials.

The application discloses a kind of preparation methods of anti-oxidation nano silicon slurry, comprising the following steps: (1) oxidation inhibitor is added in alcohol solvent, stirring dissolves;(2) the silicon powder of D50 5-10um is dispersed in above-mentioned solution, and stirring is matched into the silicon slurry of solid content 10%-20%;(3) silicon slurry is ground by sand mill wet, and grinding is carried out in two stages, first using coarse grinding sand mill grinding 2-4h, then switching fine grinding sand mill grinding 15-30h.The application is by adding organic weak acid as oxidation inhibitor in sand mill solvent, so that the oxidation phenomenon of prepared nano silicon slurry is reduced.In addition, the addition of organic weak acid also helps to improve the dispersion performance of slurry, improve the fluidity of slurry, improve sand mill efficiency, and thus greatly improve the electrochemical performance of prepared silicon powder.

The invention discloses a preparation method of a Fe3O4 and plant polyphenol composite biomass-based photo-Fenton catalyst, belongs to the technical field of environmental catalytic materials, and relates to a preparation method of a biomass-based photo-Fenton catalyst. The invention aims to solve the problems of complex preparation process and high cost of the existing iron-based catalyst. The preparation method of the Fe3O4 and plant polyphenol composite biomass-based photo-Fenton catalyst comprises the following steps: 1, pretreating a biomass raw material; 2, loading iron species; 3, alkali precipitation; 4, reduction and nucleation; 5, circularly dipping and strengthening; and 6, post-treatment: collecting a product through magnetic separation, washing the product with pure water for five times, and drying the product to obtain the Fe3O4-plant polyphenol composite biomass-based photo-Fenton catalyst. The preparation method is simple and low in cost.

The application discloses a novel selective adsorption of primary amino-containing dye magnetic bio-based adsorbent, and a preparation method thereof, which comprises the following steps: reacting sodium lignosulfonate, carboxylated chitosan, sodium alginate, magnetic particles, epichlorohydrin and polyethylene imine. The raw material containing rich carboxyl, sulfonic acid group and imine group is added to facilitate the coordination of metal ions, more active sites are added, the new design idea of adding the pore-forming agent polyethylene glycol to increase the specific surface area of the adsorbent microspheres, and the composite preparation of carboxylated chitosan (CCS), sodium lignosulfonate (LS), sodium alginate (SA) and magnetic particles (Fe3O4) and the modification of polyethylene imine (PEI) are realized through the one-pot method, so as to obtain a magnetic bio-based adsorbent which can selectively adsorb primary amine-containing dyes. The removal rate of the adsorbent SA-CCS-LS@Fe3O4 to the primary amine-containing dyes reaches more than 98%, and the adsorbent can be recycled.

The application discloses a kind of amidoxime materials and its preparation method and application, belong to heavy metal adsorption material field.Amidoxime material in the application is prepared by Schiff base reaction, addition reaction and metal loading, catalyst and regulator need to be added in the process of Schiff base reaction to form specific morphology in preparation process, and monomer in the process of addition reaction also needs to have cyano and mercapto simultaneously, to provide fixed basis for subsequent metal loading process and respond to heavy metal to be adsorbed.Amidoxime group in the amidoxime material in the application has strong multidentate coordination ability, can adsorb heavy metal ions, and reducing agent used in the process of metal loading can reduce heavy metal ions, so that the amidoxime material has adsorption and reduction performance simultaneously.

This invention relates to a bifunctional electrocatalytic self-supporting electrode based on filter paper and its preparation method, belonging to the field of electrocatalysis technology. The preparation method consists of the following steps: (1) weighing nickel sulfate and cobalt sulfate and dissolving them in deionized water; (2) dissolving sodium citrate and sodium hypophosphite in deionized water respectively, and then adding them sequentially to the solution obtained in step (1); (3) adjusting the pH of the solution obtained in step (2); (4) cutting the filter paper; (5) preparing a sodium hydroxide solution; (6) placing the cut filter paper in a water bath in the solution prepared in step (5); (7) weighing palladium chloride and sodium borohydride and dissolving them in deionized water at room temperature; (8) activating and then reducing the filter paper in step (6); (9) placing the filter paper obtained in step (8) in a water bath in the solution obtained in step (3) and drying it. This invention reduces overpotential, decreases relative energy consumption, increases catalytic activity, and improves catalyst stability.

The invention discloses a medical pressure belt based on nylon spandex elastic flannelette and a preparation method of the medical pressure belt, and relates to the technical field of medical pressure belts. The preparation method comprises the following steps: pretreating brocade spandex elastic flannelette through alkali washing and acid washing, immersing the brocade spandex elastic flannelette into an epsilon-polylysine solution to form a bottom coating, dispersing composite phthalocyanine powder consisting of water-soluble phthalocyanine dye, monosubstituted beta-carboxyl zinc phthalocyanine and iron phthalocyanine derivatives, adjusting the pH value, adding an auxiliary agent to prepare slurry, dip-dyeing a base material with the bottom coating, pre-drying, and curing to obtain a finished product. The pressure belt integrates the functions of efficient antibiosis, deodorization and dyeing, the coating is high in adhesive force, washable and durable, the base material is elastically attached, the biological safety is high, and the pressure belt is suitable for the scenes of clinical infection prevention, postoperative care and the like.

The invention provides a charcoal-based metal oxide composite material as well as a preparation method and application thereof, and belongs to the technical field of viscosity reduction of thickened oil. The rich porous structure and high specific surface area of the biochar are used as a carrier of the active component, so that the active component is uniformly dispersed, active sites are increased, and the catalytic activity is improved; iron oxide can catalyze hydrocarbon in the thickened oil to generate oxidation reaction to generate oxygen-containing functional groups, so that the viscosity of the thickened oil is reduced; niO has good hydrogen transfer capacity and can promote hydrogen atoms to be transferred from a hydrogen donor to unsaturated hydrocarbon of the thickened oil, so that the viscosity of the thickened oil is reduced; the rare earth oxide can enhance the reaction activity of ferric oxide and NiO, promote the oxidation-reduction reaction, reduce the temperature of the catalytic reaction and expand the temperature application range; the rare earth oxide can also protect the transition metal oxide, so that vulcanization is reduced, and the service life is prolonged; the silicon dioxide layer can avoid loss of active components, and the cycle service life is prolonged.

The application discloses a kind of based on pre-oxidized carbon fiber composite graphene electrode soft felt preparation method, electrode soft felt and battery, first by the way of plasma CVD method on the surface of carbon fiber growth oxygen is used to pre-oxidize carbon fiber, and graft oxygen-containing functional groups without destroying the internal structure of carbon fiber;Then again with graphene oxide reaction forms graphene composite carbon fiber filament;Finally, based on graphene composite carbon fiber filament is made into preform.The scheme is based on pre-oxidized carbon fiber composite graphene preparation and forms high-performance electrode soft felt, effectively improves the contact site of electrode, increases energy density, and can effectively overcome the problems existing in prior art.

This invention discloses a dual-dispersed hydroxyapatite-supported nickel catalyst, its preparation method, and its application in methane dry reforming. The invention employs morphology control and in-situ nickel framework doping strategies to replace calcium ions in the hydroxyapatite support, loading the active nickel component via a coupled impregnation process. Nickel achieves dual, efficient dispersion on the hydroxyapatite support surface and at lattice sites, inhibiting particle sintering during the reaction, enhancing electronic synergy, and improving anti-coking ability. In methane dry reforming, it exhibits advantages such as high conversion rate, high stability, low coking, and long lifespan, significantly improving catalytic activity and high-temperature stability. This invention's process is green, low-cost, and easily scaled up, overcoming the bottlenecks of traditional nickel-based catalysts' sintering, coking, and high cost due to precious metals, providing a new, efficient, and stable catalytic solution for high-temperature methane dry reforming.

The application discloses a high-performance oxygen evolution reaction composite electrocatalyst and a preparation method thereof, and belongs to the field of electrocatalytic material preparation. The application solves the problem that it is difficult to realize uniform loading and precise size control of RuO2 nanoparticles on a three-dimensional porous complex substrate (foamed nickel), thereby affecting the performance and repeatability of the prepared electrocatalyst. The method comprises the following steps: sulfidizing the foamed nickel with thiourea first, and then uniformly depositing RuO2 nanoparticles on the surface of the foamed nickel-based Ni3S2 by using an ALD technology. The application precisely controls the size of the RuO2 nanoparticles on the surface of the foamed nickel-based Ni3S2 to be 1.5-3.5 nm, and the surface density to be 0.8-1.2´10 12 / cm 2 , so that the conductivity and electrochemical activity of the catalyst can be improved, the charge transfer rate can be improved, and the OER performance of the electrocatalyst is improved.

The application belongs to the technical field of catalytic materials, and particularly relates to an oxygen vacancy modified MnO2 / Mn3O4 heterojunction material and a preparation method and application thereof. The MnO2 / Mn3O4 heterojunction material is obtained by solvothermal reaction of MnO2 as a precursor in an organic alcohol solvent. By controlling the solvothermal temperature or the solvothermal time, the in-situ grown Mn3O4 forms the MnO2 / Mn3O4 heterojunction, the disorder structure generated in the lattice transformation process from MnO2 to Mn3O4 causes more oxygen vacancies to be formed on the interface, and the concentration of Mn 3+ is improved. The obtained MnO2 / Mn3O4 heterojunction material contains rich active sites (Mn 3+ and oxygen vacancies) for ozone adsorption and dissociation, has good catalytic activity, and can efficiently catalyze the degradation of organic pollutants in water by ozone.

The application discloses a preparation method of modified ion exchange resin and application thereof, and relates to the technical field of water treatment materials. Resin, EDC.HCl and L-arginine are proportionally immersed into a solution system with pH being 5 (the solution system with pH being 5 is obtained by adjusting 1% dilute hydrochloric acid), to obtain solution A, the solution A is heated to 35-45 DEG C and placed in a magnetic stirring pot, the stirring speed is set to 280-300 rpm, and the reaction is continuously carried out for 5-6 hours, to obtain resin B and residual liquid B, the resin B is washed with deionized water and anhydrous ethanol alternately for 5-6 times, until the filtrate is neutral; the resin B is placed in a vacuum drying box, the temperature is set to 55-60 DEG C, the vacuum degree is set to -0.09 MPa, and the drying is continuously carried out until the weight is constant, to obtain the modified ion exchange resin. The grafting of L-arginine increases more active sites of the resin, the nickel ions can be effectively combined with the resin, and the adsorption capacity of the resin for the nickel ions is improved.

The application discloses a series of compounds with a multi-benzene ring hydroxyl system and application of the compounds as photoinitiators. The multi-benzene ring hydroxyl aromatic system compound of the application can be combined with diazonium naphthoquinone (DNQ) to form a photoresist which is loaded on the surface of a substrate, and the photoresist can be processed by a photoetching process to obtain a high depth gradient, thus having practical significance for becoming an I-line photoinitiator.

This invention discloses a graphene aerogel surface microwave absorbing material supported on Fe / N co-doped hollow carbon nanospheres and its preparation method. First, a reduced graphene oxide aerogel is prepared using graphene oxide as a raw material. Then, hollow Fe3O4 magnetic nanoparticles are prepared via a hydrothermal method using FeCl3·6H2O and ammonium acetate as raw materials. Finally, Fe3O4 / PPy / reduced graphene oxide aerogel is prepared by in-situ polymerization, and the graphene aerogel supported on Fe / N co-doped hollow carbon nanospheres is obtained through high-temperature heat treatment. The graphene aerogel surface microwave absorbing material supported on Fe / N co-doped hollow carbon nanospheres of this invention exhibits excellent dielectric and magnetic losses. Simultaneously, the magnetic Fe nanoparticles in the material can effectively convert electromagnetic wave energy, achieving excellent microwave absorption performance, and showing great potential in next-generation cutting-edge advanced nanocomposite materials.

The application relates to a method for preparing a wearable potential ion sensor based on a conductive polymer nanofiber membrane and belongs to the field of electrochemical sensing. The method mainly comprises the following steps: (1) conductive polymer monomer solution and initiator-crosslinking agent mixed solution are successively drop-coated on the surface of an electrode, the latter induces monomer assembly polymerization, a conductive polymer nanofiber membrane is obtained, and drying is performed; (2) an ion-selective membrane dispersion liquid is prepared according to a certain proportion and is dropwise added to the electrode, and film drying is performed; (3) after the prepared electrode is dried overnight in the dark, the electrode is placed in a prepared standard ion solution (to-be-measured ion) for pretreatment; and (4) the electrode is placed in ion solutions with different concentrations for testing, the relationship between ion concentration and voltage is obtained, a standard curve and a linear equation are obtained, and monitoring of ion concentration in sweat is realized. The wearable potential ion sensor prepared by the method can realize high-sensitivity real-time monitoring of ions in sweat.