31 results about "Sodium polysulfide" patented technology

The invention relates to the field of silane coupling agents, and discloses a preparation method of a sulfur-containing silane coupling agent, which comprises the following steps: step 1, mixing alkali metal sulfide with sulfur, stirring, and reacting to obtain a sodium polysulfide solution; step 2, adding a pH regulator, a hydrolysis inhibitor and a phase transfer catalyst into the sodium polysulfide solution, dropwise adding 3-halogen propyl trialkoxysilane, and stirring for condensation reaction to obtain a crude product reaction solution; 3, the crude product reaction liquid is sequentially subjected to distillation, decolorization with a decolorizing agent and filtration, and the sulfur-containing silane coupling agent is prepared after the steps are completed. The crystal water contained in the raw materials is used as a reaction medium, so that additional addition of an organic solvent and pre-drying and dehydration treatment are not needed, the spontaneous combustion risk of sodium sulfide is avoided, raw material pretreatment and solvent recovery procedures are omitted, and the whole technological process is simplified, so that the operation is simple and convenient, and the cost is low. The method is suitable for large-scale industrial production.

The invention discloses a (Fe (OH) 2) ((OH) 0.25 (H2O) 0.5) / W18O49 composite material as well as a preparation method and application thereof, and belongs to the technical field of functional materials. The preparation method comprises the following steps: uniformly mixing and stirring cyclohexanol, acetylacetone and absolute ethyl alcohol, adding tungsten hexachloride, uniformly stirring at room temperature, then adding ferric trichloride, uniformly stirring at room temperature, carrying out hydrothermal reaction, washing and drying to obtain the (Fe (OH) 2) ((OH) 0.25 (H2O) 0.5) / W18O49 composite material. A mixed system of cyclohexanol, acetylacetone and absolute ethyl alcohol is utilized to synergistically solve the problems of advanced hydrolysis and agglomeration of metal ions; the oxygen vacancy of the W18O49 accelerates the conversion of the sodium polysulfide, and the Fe (OH) 2 derivative strengthens the chemical anchoring of the sodium polysulfide, thereby realizing the synergy of the anchoring and rapid conversion of the NaPSs. When being used as a sodium-sulfur battery positive electrode material catalyst, the catalyst shows excellent catalytic performance and rate capability, and still has the capacity of 420 mAh g <-1 > after circulating for 25000 circles under the large current density of 10 A g <-1 >. The strong adsorption characteristic of the hydroxylated iron-based component and the high catalytic activity of W18O49 are utilized to form a synergistic effect, and a new scheme is provided for breaking through the technical bottleneck of an RT Na-S battery.

The invention relates to the technical field of preparation of organic silicon functional materials, and particularly discloses an integrated preparation method of bis-[gamma-(triethoxy silicon) propyl] tetrasulfide-chloromethyl phenethyl triethoxy silane mixed silane, which comprises the following steps: by taking a chloropropyl triethoxy silane-chloromethyl phenethyl triethoxy silane mixture as a raw material, carrying out one-step reaction on the raw material to obtain bis-[gamma-(triethoxy silicon) propyl] tetrasulfide-chloromethyl phenethyl triethoxy silane mixed silane, and carrying out one-step reaction on the bis-[gamma-(triethoxy silicon) propyl] tetrasulfide-chloromethyl phenethyl triethoxy silane mixed silane; in the whole process, a reaction system and process parameters are reserved and designed around the function of chloromethyl phenethyl triethoxy silane, and the overall production efficiency is improved by shortening the time consumption of a sodium sulfide synthesis procedure; the target mixed silane is prepared through four core processes of sodium sulfide synthesis, sodium polysulfide in-situ preparation, selective vulcanization in a phosphate buffer system and product homogenization in sequence. According to the invention, a one-step integrated preparation method is innovatively adopted to replace a traditional compounding process, the total impurity content of the product is less than 0.6%, the equipment investment cost is reduced, and the overall production efficiency is improved.

The invention belongs to the technical field of new materials, and provides a preparation method of high-yield nickel disulfide (NiS2) or a nickel disulfide / sulfur compound (NiS2 / (x-2) S, 3 < = x < = 8) and an application of NiS2 or NiS2 / S in an electrode material. The preparation method comprises the following steps: mixing a nickel ion (Ni < 2 + >) solution with a sodium disulfide (Na2S2) solution or a sodium polysulfide (Na2Sx, x is greater than or equal to 3 and less than or equal to 8) solution, stirring and reacting for 0.5-12 hours, collecting precipitates obtained by reaction, washing and drying to obtain a NiS2 or NiS2 / (x-2) S (x is greater than or equal to 3 and less than or equal to 8) product. The preparation method is simple and easy to operate, low in cost, high in atom utilization rate, green and environment-friendly, high in safety and capable of realizing large-scale industrial production. And when used as an electrode material for a sodium ion battery, the composite material shows good electrochemical performance.

The invention discloses a high-performance room-temperature sodium-sulfur battery positive electrode material and a preparation method thereof. The positive electrode material is a sulfur / carbon supported catalyst composite material, metal salt containing lattice water and a compound containing an organic functional group are subjected to simple mechanical mixing and aging under the condition of no additional solvent, high-temperature calcination is performed, metal elements in the metal salt are partially reduced and are supported on the carbonized organic compound, and the positive electrode material is obtained. And forming the carbon / metal composite material. The carbon-loaded metal composite material is fused with pure sulfur powder to obtain the sodium-sulfur battery positive electrode material, the advantages of high specific surface area, good conductivity and the like of a porous carbon material can be effectively utilized, and meanwhile, the catalytic performance is fully played, so that the conversion rate of long-chain sodium polysulfide is increased, the retention time of the long-chain sodium polysulfide in electrolyte is shortened, the shuttle effect is greatly relieved, and the service life of the sodium-sulfur battery is prolonged. The stability of the sodium-sulfur battery in the cycle process is improved, so that the sodium-sulfur battery shows good cycle stability and relatively high specific capacity.

This invention discloses a WS2 / WO2 composite material, its preparation method, and its application in sodium-sulfur batteries, belonging to the field of functional material preparation technology. The method includes: mixing cyclohexanol and oleic acid evenly to obtain a mixed solvent; adding tungsten hexachloride to the mixed solvent and stirring at room temperature until dissolved to obtain a precursor solution; subjecting the precursor solution to a hydrothermal reaction, washing, and drying to obtain W2 / WO2. 18 O 49 Powder; W 18 O 49 After the powder and sulfur source undergo a thermally controlled reaction under an inert atmosphere, a WS2 / WO2 composite material is obtained. This invention prepares a WS2 / WO2 composite material with a unique three-dimensional heterostructure through a simplified two-step method. By integrating the strong adsorption properties of WS2 and the high catalytic activity of WO2, and through interfacial coupling, the conversion of sodium polysulfides is synergistically accelerated. At the same time, its preparation process is significantly more complex than existing technologies, and can effectively suppress the shuttle effect, improve reaction kinetics, and enhance battery cycle stability.

The present invention provides a method for the resource utilization of sulfur-containing wastewater based on the tandem oxidation of electrochemistry and chemistry, belonging to the technical fields of sulfur-containing wastewater treatment and resource utilization, as well as electrochemically hydrogen evolution technology. This method uses wastewater rich in high-concentration sulfide ions as a substrate, and adopts an electrochemical oxidation method to electrocatalytically oxidize it to polysulfide at the anodic end, coupling with the hydrogen evolution reaction to produce high-purity hydrogen at the cathode; at the same time, a sodium ion exchange membrane is used to achieve alkali recovery at the cathode, and a two-electrode system for low-energy-consuming sulfur ion oxidation-assisted electrolytic hydrogen production is constructed. Further, the sodium polysulfide solution obtained at the anode is catalytically oxidized and filtered and crystallized by using a metal sulfide powder catalytic material to prepare sodium thiosulfate, obtaining a high-value-added product. The present invention adopts the electrochemistry + chemistry tandem method to simultaneously realize the treatment of sulfur-containing waste liquid and the production of high-value-added substances, which is a new solution combining environmental governance and clean energy hydrogen production, and has important significance and application prospects.

The present invention discloses a cubic phase cobalt nickel sulfide and few-layer Ti3C2T3 for room temperature sodium-sulfur battery. x Preparation method of MXene nanosheet composite material. The invention content is: a cubic phase cobalt-nickel bimetallic sulfide supported on a few-layer Ti3C2T x MXene nanosheets as highly active catalytic materials ((Co 0.5 Ni 0.5 )9S8@Ti3C2T x ), can be used as an effective sulfur host material for room temperature sodium-sulfur batteries, showing excellent sodium storage performance. The specific preparation method is: first, Ti3C2T is obtained by LiF / HCl etching and stripping method. x MXene nanosheet substrate; then compound it with cobalt nickel metal salt solution to form a uniform solution; then add hydrazine hydrate reducing agent to react to generate Co 0.5 Ni 0.5 @Ti3C2T x Precursor; then generates cubic phase (Co 0.5 Ni 0.5 )9S8; washing and freeze-drying to obtain a composite catalytic material; the present invention adjusts the ratio of cobalt and nickel, and the ratio is 1:1 when the cubic phase (Co 0.5 Ni 0.5 )9S8 and Ti3C2T x MXene composite materials have the best catalytic performance. When used in room-temperature sodium-sulfur batteries, they can promote the rapid conversion of soluble sodium polysulfide to insoluble Na2S, thereby improving the specific capacity and cycle life of room-temperature sodium-sulfur batteries.

The invention discloses a process method for producing sodium sulfide from solid waste after waste lithium battery treatment. The process method comprises the following steps: step 01, material preparation section; 02, a preheating section; step 03, a calcining section; step 04, a heating section; step 05, evaporation section; step 06, a product packaging section; and pumping the sodium sulfide concentrated solution into a tabletting machine in a tabletting and packaging section, cooling and solidifying the sodium sulfide concentrated solution into a solid, blanking, slicing and packaging into a sodium sulfide product. According to the invention, resource utilization of the graphite slag as the solid waste is realized, and the economic benefit of the waste lithium battery product is improved. In the whole sodium sulfide production process method, a raw material preheating method and an indirect heating external heating type calcining rotary furnace are adopted, so that substances such as oxygen in water vapor and flue gas are not in contact with a reaction mixture, and side chemical reactions causing generation of impurities such as sodium carbonate, sodium thiosulfate or sodium polysulfide are avoided as far as possible from the source; therefore, the yield of the product is improved, the impurity content in the product is low, and the purity of the product is improved.

The invention discloses a chain type scraper film reaction device for a sulfur-containing silane coupling agent and a method for producing the sulfur-containing silane coupling agent by adopting the chain type scraper film reaction device. Comprising a scraper film reactor, a horizontal screw centrifuge, a mixing kettle, a slurry pump, a chloropropyltriethoxysilane metering tank, an anhydrous sodium polysulfide powder tank, a condenser, a receiving tank, a Roots vacuum unit, a pipeline pump, a precision filter and a finished product tank. A discharge hole is formed in the lower part of the mixing kettle and is connected with an inlet of the slurry pump; the chained scraper film reactor is provided with a feeding hole A and a feeding hole B which are symmetrically distributed; and a chain-type scraper is arranged in the chain-type scraper film reactor. According to the invention, a suspension of chloropropyltriethoxysilane and anhydrous sodium polysulfide can enter the symmetrically distributed feed ports of the reactor through the slurry pump, and is pumped into the scraper film reactor at a certain flow rate, and a uniform film is formed through the chain type rotary scraper for reaction, so that the reaction device has efficient mass and heat transfer effects and uniform temperature distribution.

The invention relates to a preparation method and application of a polyimide / sulfur-doped aminated graphene (PI / S-AGO) composite wave-absorbing film. The preparation method is realized by three steps of: firstly, bonding graphene oxide with p-phenylenediamine to prepare aminated graphene (AGO); then enabling AGO to react with sodium polysulfide at 95 DEG C, and embedding sulfur atoms into graphene crystal lattices in a C-S bond form to form sulfur-doped graphene (S-AGO); finally, the S-AGO, 4, 4 '-diaminodiphenyl ether and 3, 3', 4, 4 '-benzophenone tetracarboxylic dianhydride are subjected to low-temperature polycondensation and gradient imidization (150-300 DEG C), and the composite film is prepared. The innovation lies in that lattice defects and polar functional groups introduced by sulfur doping significantly enhance the interface / dipole polarization effect, so that the reflection loss of the material at the Ka waveband (26.5-40 GHz) and 34.8 GHz reaches-65.8 dB, the effective absorption bandwidth is 6.42 GHz (the corresponding thickness is 3.15 mm), the performance is improved by 61% compared with that of an undoped system, and the material is suitable for the fields of 5G communication (28 / 39 GHz), radar stealth and high-frequency electromagnetic shielding.

The invention discloses an adhesive composition for an optical film based on waste plastics and a preparation method, and the preparation method comprises the following steps: in the preparation process of an adhesive, modifying titanium dioxide through oleic acid and mPEO, and then copolymerizing a sodium persulfide solution and the modified titanium dioxide to prepare a high-refractive-index substance, so that the high refractive index of the adhesive can be improved; the surface treatment is performed by incorporating metal oxide particles, thereby improving dispersibility in the adhesive layer and in the composition for coating the layer, and further improving the luminance of the adhesive.

The application provides a method and equipment for separating selenium and tellurium from high-tellurium crude selenium raw materials. The method can selectively form tellurium polysulfide from tellurium in the crude selenium by adding sulfur in an alkaline solution, so that the metallic tellurium is converted into ions and enters the solution, and the main metallic selenium remains in the slag, thereby preliminarily and effectively separating the selenium and the tellurium, achieving a separation coefficient of 90.67%, and reducing the content of tellurium in the crude selenium raw material from 0.30% to 0.028%. The application has the advantages of good selenium and tellurium separation effect, simple operation, short process, and strong raw material adaptability.

A hydrocarbon-based membrane material composition for a redox flow battery includes component A that is a polymer including an anionic group selected from a group consisting of a sulfonylimide moiety, a tetrahedral borate-based moiety, and a carboxylate-based moiety. The composition further includes component B that is a polymer including a sulfonate moiety. The content of component A is 60 to 100 wt. % based on the total weight of components A and B. The content of component B is 0 to 40 wt. % based on the total weight of components A and B. Components A and B may be block copolymers such as pentablock terpolymers. The sulfonylimide moiety may be (trifluoromethanesulfonyl)imide. A method of making a hydrocarbon-based membrane for a redox flow battery and a redox flow battery including the hydrocarbon-based membrane are also provided. The redox flow battery may be a non-aqueous Na—S flow battery.

The invention provides a preparation method and application of a multi-sulfur polymer. The preparation method comprises the following steps: mixing a dichloro intermediate and a sodium polysulfide aqueous solution, and carrying out condensation polymerization in a formed mixed system to prepare a polysulfide polymer; an organic solvent exists in the mixed system, and the organic solvent is selected from C6-C9 aromatic hydrocarbons. According to the preparation method disclosed by the invention, salt after condensation polymerization can be quickly and efficiently separated, so that the quality of liquid polysulfide rubber obtained during cracking of the polysulfide polymer is improved, and the production efficiency of a production device is greatly improved.

The present invention relates to the field of flotation technology, and in particular to a flotation separation method for copper-sulfur polymetallic ore. The flotation separation method for copper-sulfur polymetallic ore of the present invention comprises the following steps: S1, grinding the raw ore to obtain a ground material having chalcopyrite 112, 204, and 312 crystal face exposure ratios of 55% to 65%, 5% to 18%, and 3% to 10%, respectively, and pyrite 100 crystal face exposure ratio of 60% to 80%; S2, mixing the ground material, a collector A, an inhibitor B, and a frother and performing a roughing operation to obtain a roughing concentrate and a roughing tailing; S3, mixing the roughing concentrate and the collector A and performing multiple rounds of concentration to obtain a copper concentrate; S4, performing cascade enhanced flotation on the roughing tailing to obtain a sulfur-containing tailing; the collector A comprises the inhibitor B, sodium cyanamide, sodium dicyanamide, sodium polymelamide, and sodium polysulfide; and the flotation method improves the recovery rate of copper and sulfur.

This invention relates to a sodium polysulfide-based cyanide-free zinc-inhibiting composite inhibitor for lead-zinc separation, comprising, by weight: 1-2 parts sodium polysulfide, 3-5 parts zinc sulfate, 1-4 parts sodium metabisulfite, and 0.1-1.5 parts organic selectivity modifier; the sodium polysulfide is Na₂S. x The formula is: x = integers from 2 to 4; the organic selective regulator is one of L-cysteine, tannin, and modified corn starch; sodium polysulfide is the core zinc-inhibiting component; zinc sulfate and sodium polysulfide work synergistically to enhance the inhibition effect on sphalerite; and the organic selective regulator further strengthens the selectivity of "inhibiting zinc but not lead," reducing lead mineral loss. This invention's composite inhibition does not require operation under strongly alkaline conditions; only neutral slurry is needed to achieve efficient inhibition, significantly reducing the amount of lime used and avoiding the problem of excessively high alkalinity in the return water. This reduces the neutralization cost of return water treatment and fundamentally solves the problem of scaling and clogging in return water and slurry pipelines.

The present invention discloses a preparation method and application of an antibacterial active MnS material. The preparation includes: (1) Mixing manganese chloride, sodium hydroxide, sodium polysulfide, polyvinylpyrrolidone and ultrapure water, stirring until completely dissolved, heating for reaction and then cooling. After centrifuging the reaction solution, washing the solid, and vacuum drying, α-MnS is obtained; Mixing manganese carbonate, sodium sulfide nonahydrate and ultrapure water, stirring until completely dissolved, heating for reaction and then cooling. After centrifuging the reaction solution, washing the solid, and vacuum drying, γ-MnS is obtained. The present invention synthesizes two different crystal forms of manganese sulfide, α-MnS and γ-MnS, by regulating the reaction raw materials. Both of them have the ability to release hydrogen sulfide and have certain antibacterial effects. Compared with α-MnS, γ-MnS has a stronger hydrogen sulfide release ability and better antibacterial effect. The present invention realizes the improvement of its antibacterial activity by regulating the crystal form of MnS.

This invention utilizes microwave-assisted rapid preparation of Ni-ZIF-8 derived carbon materials. Using this material as the main component, sulfur is loaded as the active material to prepare the cathode material, which is then assembled into an RT Na-S battery. The process is simple, structurally stable, and exhibits excellent electrochemical performance, possessing certain practical application value. By introducing metallic nickel to modify the basic structure of ZIF-8, the derivative acquires certain catalytic capabilities, and the precursor Ni-ZIF-8 is prepared using a simple synthetic reaction. Then, by introducing a microwave absorber, rapid carbonization is achieved under microwave irradiation to obtain the Ni-ZIF-8 derived carbon material. The drastic temperature change causes the bulk structure of the precursor to break down during carbonization, preserving the high specific surface area and abundant active sites of traditional ZIFs while enhancing the material's conductivity. Relying on the high specific surface area, abundant active sites, and excellent conductivity of the Ni-ZIF-8 derived carbon material, the synergistic effect of "physical adsorption-chemical adsorption-catalytic conversion" effectively suppresses sodium polysulfide shuttle, reduces internal battery polarization, and exhibits excellent electrochemical performance.

The application provides a fluorine-doped phosphorus-carbon composite negative electrode material, which is composed of elemental phosphorus and a fluorine-doped porous carbon substrate, the fluorine-doped porous carbon substrate has gradually decreasing fluorocarbon content from the surface layer to the inside, and the X-ray photoelectron spectrogram (XPS spectrogram) of the F element has characteristic peaks of 687.2±0.1eV and 685.5±0.1eV. The composite material is composed of elemental phosphorus and a porous carbon substrate, the porous carbon is composed of carbon and fluorocarbon. By introducing fluorine atoms into the porous carbon, the structure of carbon and fluorocarbon is constructed, the carbon content of the surface layer to the inside of the porous carbon material gradually increases, and the fluorocarbon content gradually decreases. The introduction of fluorine successfully constructs a polar interface on the surface of the material, and in the battery cycle process, the polar interface effectively improves the polysulfide adsorption of the material to sodium, inhibits the dissolution of sodium polysulfide shuttle, and thus effectively improves the cycle performance of the composite material.

Method of flotation separation for copper-sulfur polymetallic ore includes: S1, an ore grinding treatment is carried out on a raw ore to obtain a ground ore material with the exposure ratio of 112, 204, 312 facets of chalcopyrite of 55%-65%, 5%-18%, and 3%-10% respectively, and the exposure ratio of 100 facet of pyrite of 60%-80%; S2, the ground ore material, the collector A, the depressant B and the frother are mixed and undergo one-time roughing, so as to obtain the rougher concentrate and the rougher tailings; S3, the rougher concentrate and the collector A are mixed and undergo multiple-time cleaning to obtain the copper concentrate; and S4, the cascade-intensified flotation is carried out on the rougher tailings to obtain a sulfur-containing tailings, wherein the collector A includesand the depressant B includes sodium cyanamide, sodium dicyandiamide, sodium polycyanamide and sodium polysulfide.

The invention provides a preparation method of a biomass waste-based porous carbon material for a positive electrode of a room-temperature sodium-sulfur battery. The preparation method comprises the following steps: S1, carrying out pre-carbonization treatment on a waste biomass material pine nut shell at a high temperature; s2, putting the pre-carbonized material obtained in the step S1 into a ball milling tank for pulverization; s3, mixing the powder obtained in the step S2 with cobalt potassium cyanide and a KOH solution, stirring for a certain time, centrifuging, and drying; s4, putting the sample obtained in the step S3 into a tubular furnace for high-temperature sintering, and performing alkali washing, acid washing and water washing on the sintered sample until the sample is neutral to obtain a doped modified porous carbon material; and S5, loading sulfur into the porous carbon material obtained in the step S4 through a hot melting method to obtain the sulfur-carbon composite positive electrode material for the sodium-sulfur battery. The cobalt-doped biomass porous material obtained in the invention not only promotes the rapid conversion of polysulfide, but also effectively inhibits the shuttle effect and volume expansion effect of sodium polysulfide, and significantly improves the cycling stability and rate capability of a sodium-sulfur battery.

This invention discloses a lignin-derived carbon-coated NiS / TiO 2 Composite materials, their preparation methods, and applications. This invention uses sodium lignosulfonate as a carbon precursor and introduces TiO2, a substance with strong adsorption properties for sodium polysulfide. 2 NiS / TiO₂ with high specific capacity and good cycle stability was prepared by hydrothermal and calcination treatment. 2 / C composite material has a simple preparation process and low cost. As a high-energy-density and high-stability sodium-ion battery anode material, it is of great significance to the development of sodium-ion battery anode materials.

The application discloses modified mixed cat litter containing zeolite bentonite and a preparation method thereof, and belongs to the technical field of modified mixed cat litter preparation.The modified mixed cat litter containing zeolite bentonite is composed of the following components in parts by weight: 30-50 parts of modified cat litter, 10-20 parts of bentonite cat litter, and 0.1-0.3 parts of antibacterial agent, wherein the modified cat litter is prepared from corn straw, acrylic acid, zeolite, bean dregs, starch and polyacrylamide solution, and the antibacterial agent is prepared from ammonia water, methyl acrylate, sodium polysulfide, isopropylamine and sulfuryl chloride.The modified mixed cat litter prepared by the method has excellent water absorption rate, ammonia removal effect and antibacterial property.

This invention discloses a method for controllably preparing sodium polysulfide heterostructures anchored to hard carbon through grafting synergy. The method includes the following steps: S1, dissolving sucrose and performing a hydrothermal reaction to obtain hydrothermal carbon microspheres; S2, mixing the hydrothermal carbon microspheres and sodium thiosulfate (Na2S2O3) and ball milling them at high energy followed by high-temperature treatment to obtain covalently coupled Na2S... x / HC heterostructure. This invention also discloses a Na2S obtained by the above preparation method. x / HC heterostructure and its application in sodium-ion battery anode. The Na2S provided by this invention... x / HC heterostructure, as the negative electrode of sodium-ion batteries, features high sodium storage capacity, high initial efficiency, and ultra-high rate sodium storage.

The invention discloses a preparation method of a CuNPs / S-GS / PDMS flexible piezoresistive sensor and application of the CuNPs / S-GS / PDMS flexible piezoresistive sensor. The sensor is composed of a PDMS flexible substrate layer, a surface interdigital electrode, a CuNPs / S-GS / PDMS composite foam sensitive layer covering the electrode, and a PET packaging layer. The preparation method comprises the following steps: (1) mixing a graphene oxide dispersion liquid with a gradient concentration copper nitrate solution, adding a sodium polysulfide solution under the protection of nitrogen, and reacting at 90-100 DEG C to synthesize CuNPs / S-GS; (2) loading the CuNPs / S-GS on the PDMS by adopting a template method; and (3) fixing an interdigital electrode on the surface of the PDMS thin film, covering the composite foam body, and then packaging and molding by PET (Polyethylene Terephthalate). According to the sensor, CuNPs are connected with a sulfur-doped graphene network, so that the conductivity of the composite foam is improved by two orders of magnitude, three-stage high sensitivity is achieved when the CuNPs loading capacity is 30 wt%, 0.6 s quick response and 2000 times of cycle stability are achieved, human joint movement (bending of fingers, elbows and knees) can be accurately monitored in real time, and the sensor has wide application prospects in the field of wearable health monitoring.

A novel two-temperature electrochemical method and system for producing metallic sodium from sodium polysulfide have been discovered. The technology of the present invention provides high electrical conductivity for sodium ions and extends the service life of the electrochemical cell.

This application belongs to the field of battery technology, specifically disclosing a battery cell, a method for preparing the battery cell, a battery device, and an electrical device. The battery cell provided in this application includes a positive electrode sheet, which includes a positive electrode active material. The positive electrode active material includes a sulfur-carbon composite material, which includes a porous carbon material and a sulfur-containing active material supported on the porous carbon material. The sulfur-containing active material includes any one or more of elemental sulfur, sodium sulfide, or sodium polysulfide. The porous carbon material has micropores and mesopores, which are interconnected to form a tortuous pore structure. The negative electrode sheet includes a sodium metal sheet. The battery cell provided in this application improves battery capacity by reducing the loss of positive electrode active material during battery cycling.

The invention discloses antibacterial and antioxidant peach gum polysaccharide as well as a preparation method and application thereof, and belongs to the technical field of natural high polymer materials, the preparation method comprises the following steps: under the condition of an initiator, peach gum polysaccharide and glycidyl methacrylate are subjected to graft polymerization reaction in water, and epoxidized peach gum polysaccharide is prepared; and dissolving the epoxidized peach gum polysaccharide and sodium polysulfide in water, carrying out gradient temperature reaction, and then sequentially carrying out dialysis and drying to prepare the antibacterial and antioxidant peach gum polysaccharide. The prepared antibacterial and antioxidant peach gum polysaccharide retains excellent hydrophilicity and biocompatibility of natural peach gum polysaccharide, sulfur chains are introduced through accurate molecular structure modification, the antibacterial and antioxidant performance of the peach gum polysaccharide is remarkably improved, the peach gum polysaccharide has wide application prospects in the fields of food, cosmetics, biological medicine and the like, and the antibacterial and antioxidant peach gum polysaccharide can be widely applied to the fields of food, cosmetics, biological medicine and the like. Development and utilization of natural peach gum resources are promoted, and the application range of peach gum polysaccharide is expanded; in addition, the method adopts a water phase system, is safe and environment-friendly, has no organic solvent residue risk, is mild in reaction condition and low in cost, and is easy for large-scale production.

The invention discloses a three-dimensional stacked nano-beam Pd-W18O49 material and a preparation method and application thereof, and belongs to the technical field of functional materials.The method comprises the steps that cyclohexanol and acetone are evenly mixed, hexachloride is added, the mixture is evenly stirred, and W18O49 powder is obtained after hydrothermal reaction, washing and drying; and dissolving the W18O49 powder in a palladium acetate solution, carrying out a water bath reaction, washing again, and drying again to obtain the three-dimensional stacked nano-beam Pd-W18O49 material. The three-dimensional stacked nano-beam structure can provide a larger specific surface area and increase catalytic active sites; the ordered accumulation of the nano-beams is beneficial to the construction of a rapid electron transmission channel, and the electron conduction problem of the sulfur positive electrode is improved. Through the synergistic catalysis of rich oxygen vacancies and Pd and W18O49, the conversion reaction of sodium polysulfide is effectively accelerated, the shuttle effect is inhibited, and the charge-discharge efficiency, the cycle stability and the actual capacity of the battery are improved. A new breakthrough is brought to the performance improvement of the sodium-sulfur battery, and the practical application of the sodium-sulfur battery in the field of large-scale energy storage is promoted.