1040 results about "Molybdenum disulfide" patented technology

The present application relates to the technical field of catalysts and relates to a non-noble metal cathode hydrogen evolution catalyst for PEM water electrolysis and a use thereof. The present application provides a method for preparing a cathode hydrogen evolution catalyst. A nickel-molybdenum heteropoly acid having a specific structure is generated in situ on the surface of a porous carbon material carrier, and is used as a hydrogen evolution catalyst active component precursor, and an in-situ generated nickel-containing molybdenum sulfide active component is subjected to sulfidation treatment to prepare a non-noble-metal-supported cathode hydrogen evolution catalyst, wherein the in-situ generated nickel-containing molybdenum sulfide active component has a hydrogen adsorption free energy similar to that of Pt and catalytic hydrogen evolution activity, the dispersity is good, and the number of active sites is large, thereby reducing the costs of the catalyst; in addition, during the sulfidation treatment of the nickel-molybdenum heteropoly acid, nitrogen or phosphorus atoms in the carrier can be doped into the lattice of molybdenum disulfide, thereby reducing the hydrogen evolution Gibbs free energy of sulfur atoms on an MoS2 crystal basal surface, and more active sites are formed on a sulfur edge and a molybdenum edge, facilitating a hydrogen evolution reaction.

The invention discloses a carbon-doped titanium dioxide nanotube-molybdenum disulfide energy-storage antibacterial material and a preparation method thereof. The preparation method comprises the following steps: carrying out primary anodic oxidation on a clean titanium foil in a mixed electrolyte of ethylene glycol, water and ammonium fluoride; after ultrasonic treatment is carried out in a hydrochloric acid solution for set time, secondary anodic oxidation is carried out, and the mixed electrolyte of the secondary anodic oxidation is the same as that of the primary anodic oxidation; annealing the titanium foil subjected to anodic oxidation twice in an argon atmosphere, putting an annealed sample into a mixed solution of sodium molybdate, a sulfur source and glucose, and carrying out hydrothermal treatment; and the titanium foil subjected to hydro-thermal treatment is cleaned and dried, and the carbon-doped titanium dioxide titanium foil with the surface covered with molybdenum disulfide is obtained. The MoS2-coated carbon-doped titanium dioxide nanotube (TNT-C-atMoS2) with high biocompatibility developed by the invention has a synergistic effect of charge antibiosis and chemical sterilization, so that the problem of intractable biological fouling of a titanium-based metal material in ocean engineering equipment is effectively solved.

The invention discloses an application of a molybdenum disulfide-based piezoelectric catalytic material in a seawater uranium extraction material, and relates to the technical field of seawater uranium extraction, thiourea and sodium molybdate are used as precursors, and a MoS2 nanoflower with a specific 1T / 2H composite crystal structure is constructed through a hydrothermal synthesis technology. The method is placed in a uranyl nitrate solution, ultrasonic treatment is combined, efficient extraction of uranium can be achieved, and the method has potential application to extraction of uranium from seawater. The method is simple in process and environment-friendly, almost does not generate harmful waste in the synthesis process, does not need complex operation, and has good amplification preparation potential.

The invention relates to the field of design and preparation of powder metallurgy friction materials, in particular to a copper-based powder metallurgy friction material and a preparation method thereof. Raw materials used in the method comprise, by mass, 45%-55% of copper powder, 8%-20% of iron powder, 6%-15% of ferrochromium, 16%-22% of graphite, 0.5%-4% of molybdenum disulfide, 0.5%-4% of tin sulfide and 0.5%-4% of nickel-coated tungsten disulfide, and the mass ratio of the tin sulfide to the nickel-coated tungsten disulfide is (1-2): (1-2). In the nickel-coated tungsten disulfide, the content of nickel is 5-40%; the sum of the total amount of molybdenum disulfide, nickel-coated tungsten disulfide and tin sulfide is less than or equal to 5%. The preparation method comprises the following steps: weighing raw material powder according to the designed components, mixing, pressing and sintering to obtain the product. The composition design has the characteristics of scientificity, simple and controllable process and the like, and the obtained product has excellent tribological performance and completely meets the friction braking requirement of high-speed heavy-load equipment of 400km / h and above.

The invention belongs to the technical field of photoelectric detection, and discloses a heterojunction dual-band photoelectric detector based on a two-dimensional material, which comprises a substrate layer, an insulating layer, a molybdenum disulfide layer, graphene, black phosphorus and a metal electrode, the insulating layer is formed above the substrate layer, the molybdenum disulfide layer is located above the insulating layer, the molybdenum disulfide layer is formed above the insulating layer, no less than two layers of graphene are arranged above the molybdenum disulfide layer, and the top layer is multi-layer black phosphorus; the molybdenum disulfide layer, the graphene and the black phosphorus are in contact through Van der Waals force, a source electrode and a drain electrode of a formed heterostructure are connected with the metal electrode, and the molybdenum disulfide layer and the black phosphorus are isolated through the graphene and do not make contact with each other. In the invention, the intrinsic dark current in direct proportion to the effective transmission volume of the device is greatly reduced, and meanwhile, the current carriers are limited in a two-dimensional plane and are very easy to regulate and control by a local electric field, so that the dark current of the device can be further reduced, and the problem that the detector prepared from most traditional materials needs refrigeration at present can be solved.

The invention relates to the technical field of friction plates for vehicles, and particularly discloses a resin-based friction plate for an aluminum-ceramic brake disc and a preparation method of the resin-based friction plate for the aluminum-ceramic brake disc. Steel fibers serve as a main reinforcing phase, the structural strength of the material is improved, and meanwhile the steel fibers are good friction increasing materials; the reduced iron powder can improve the heat-conducting property of the brake pad and reduce the decline of the friction coefficient at high temperature; the red copper powder and the brass powder are good lubricants, the stability of single braking can be improved, and meanwhile abrasion is reduced; the silicon carbide mainly plays a role in increasing the high-temperature friction coefficient; molybdenum disulfide is beneficial for improving the recovery performance after high-temperature decline and reducing abrasion; antimony sulfide is lubricated at high temperature, and the friction coefficient in the decline stage is increased; silicon carbide is a high-hardness material, so that the friction coefficient is increased; the potassium magnesium titanate lamellar crystal improves the damping characteristic of the material and absorbs vibration and reduces noise, and the resin-based friction plate has the advantages of being high in strength, good in heat conduction, stable in friction performance, resistant to abrasion, comfortable in braking and the like and meets the use requirement of an aluminum ceramic brake disc.

The invention provides a heat-storage warm-keeping down-locking layered fabric and a down jacket. The heat-storage warm-keeping down-locking layered fabric sequentially comprises a skin-friendly layer, a liner cloth layer and a heat-storage warm-keeping down-locking layer from inside to outside, and the heat-storage warm-keeping down-locking layer is prepared by napping a heat-storage warm-keeping fabric; yarns for weaving the heat-storage and warm-keeping fabric are heat-storage and warm-keeping fiber / hollow polyester fiber / wool fiber blended yarns; the heat-storage warm-keeping fiber comprises polyester and a heat storage agent, and the preparation method of the heat storage agent comprises the following steps: firstly loading a polyethylene glycol / nano molybdenum disulfide composite material by adopting porous silicon dioxide microspheres, then mixing with a mixture containing silica sol and nano metal silver, and performing vacuum drying to obtain the heat storage agent. The heat-storage warm-keeping down-locking layered fabric has excellent heat-storage warm-keeping effects, can lock down, has a good antibacterial effect, and has a very good application effect when being used as a lining fabric of a down jacket.

The invention discloses a wide-temperature-range polyether-ether-ketone-based self-lubricating composite material part for LPBF and a forming method of the wide-temperature-range polyether-ether-ketone-based self-lubricating composite material part, and belongs to the technical field of additive manufacturing. The forming method comprises the steps that polyether-ether-ketone powder and molybdenum disulfide powder are pretreated according to different modes; after pretreatment, the two kinds of powder are mechanically mixed according to a specific proportion, and wide-temperature-range polyether-ether-ketone-based self-lubricating composite material powder is obtained; and carrying out printing forming on the polyether-ether-ketone-based self-lubricating composite material powder by adopting a laser powder bed melting (LPBF) specific process to obtain a wide-temperature-range polyether-ether-ketone-based self-lubricating composite material part. Molybdenum disulfide is adopted to enhance the friction and wear performance of polyether-ether-ketone in a wide temperature range, the printability of powder is improved through special pretreatment, and a high-performance wide-temperature-range polyether-ether-ketone-based self-lubricating composite material part suitable for high and low temperature extreme environments is obtained through forming by adopting specific LPBF processes such as multidirectional cross scanning and the like.

The invention discloses an infrared detector with a Van der Waals complementary barrier structure, a preparation method and an application. The structure of the detector is as follows: a P-type Si substrate is used as a substrate of the detector; growing a SiO2 dielectric layer on the P-type Si substrate; the black phosphorus layer covers the SiO2 dielectric layer and is used as a conducting channel; one end of the molybdenum disulfide layer covers one end of the black phosphorus layer, and the other end of the molybdenum disulfide layer is arranged on the SiO2 dielectric layer; the drain electrode is directly prepared on the other end of the black phosphorus layer and is in contact with the black phosphorus layer; the source electrode is prepared at the other end, not overlapped with the black phosphorus layer, of the molybdenum disulfide layer, and electric connection is achieved through overlapping of the molybdenum sulfide layer and the black phosphorus layer. According to the invention, high-sensitivity room temperature detection, ultra-fast response and sensing of multiple physical quantities such as light intensity, polarization and gas are realized, and the method has an application prospect in a miniaturized, low-power-consumption and multifunctional infrared detection system.

The invention discloses a monatomic-cluster double-active-site efficient ammonia cracking hydrogen production catalyst and a preparation method thereof, and belongs to the field of new energy catalytic materials. The catalyst comprises a 2-methylimidazole zinc derived nitrogen-doped carbon-loaded cobalt monatomic carrier, a molybdenum disulfide nanosheet-loaded iron cluster carrier, monatomic active metal, cluster active metal and an auxiliary agent. Wherein the 2-methylimidazole zinc derived nitrogen-doped carbon-loaded cobalt monatomic carrier is prepared by the following steps: stirring 2-methylimidazole, zinc acetate and cobalt nitrate hexahydrate in methanol to generate a ZIF-8 precursor, washing, drying, and calcining in an H2 / Ar mixed atmosphere, thereby obtaining the 2-methylimidazole zinc derived nitrogen-doped carbon-loaded cobalt monatomic carrier; the molybdenum disulfide nanosheet loaded iron cluster carrier is prepared by carrying out hydrothermal reaction on ammonium molybdate and thiourea to generate MoS2 nanosheets and then loading iron clusters. The catalyst prepared by the invention has high activity, long service life and industrial applicability.

The invention discloses an insulating material with corrosion resistance and a production process thereof, and relates to the technical field of insulating materials. The invention discloses an insulating material with corrosion resistance. The invention discloses a flame-retardant coating which is prepared from the following raw materials in parts by weight: 60 to 80 parts of bisphenol A epoxy resin, 20 to 30 parts of polyether-ether-ketone, 10 to 15 parts of nano aluminum nitride, 5 to 10 parts of boron fiber, 4 to 8 parts of molybdenum disulfide, 3 to 6 parts of poly (p-phenylene benzobisoxazole), 2 to 5 parts of vinyl trimethoxy silane, 20 to 30 parts of dimethyl sulfoxide, 8 to 12 parts of melamine cyanurate, 6 to 10 parts of magnesium aluminum hydroxide, 1 to 3 parts of Chimassorb 944 and 10 to 20 parts of modified polyvinyl alcohol. The coating is prepared from the following components in parts by weight: 20-30 parts of modified cellulose, 8-15 parts of modified cellulose, 3-7 parts of nano-zirconia, 5-10 parts of polysiloxane elastomer and 7-12 parts of fluorine-containing acrylate copolymer. The raw materials of the insulating material have a synergistic effect, and the prepared insulating material not only has conventional electrical insulation, but also has excellent heat resistance, corrosion resistance and the like, integrates hardness, flexibility, flame retardance and self-repairing performance, greatly expands the application range of the insulating material, and provides powerful support for industry development.

The invention provides a preparation method of a molybdenum disulfide material with a biological fine hierarchical structure form, and relates to the technical field of nano materials, and the preparation method comprises the following steps: preparing a biological wing as a biological template; pretreating the biological template by using an ethylenediamine tetraacetic acid solution; molybdenum disulfide grows on a pretreated biological template through a hydrothermal method, and the molybdenum disulfide material of the biomorphic fine hierarchical structure is obtained. Organisms with fine hierarchical structures existing in the nature in quantity serve as the template, and the molybdenum disulfide material of the fine hierarchical structure is prepared through the hydrothermal method; the prepared metal material inherits the fine structure characteristics of an original biological template and has wide application value in the fields of photoelectron, photocatalysis and magnetic performance, compared with the original biological template, the thickness of the molybdenum disulfide layer can be further controlled by adjusting the hydrothermal time and temperature of a hydrothermal method, and the preparation method is simple and easy to implement. The molybdenum disulfide material with the multi-scale graded fine structure and different biological morphological structures is prepared.

The invention discloses a self-lubricating aluminum coating and a preparation method thereof.The preparation method comprises the steps that molybdenum disulfide is pretreated through a silane coupling agent, tetraethoxysilane mixed liquor is added, the pH is adjusted to be 9-10, a water bath reaction is conducted, and molybdenum disulfide-silicon dioxide microcapsules are obtained after high-temperature strengthening treatment; respectively adding a zinc nitrate solution and a hexamethylenetetramine solution, adjusting the pH value to 10-11, carrying out a high-temperature and high-pressure hydrothermal reaction to obtain zinc oxide nanorods, and carrying out ball milling treatment on the zinc oxide nanorods, microcapsules, stearic acid and zirconium oxide balls under the protection of argon to obtain doped microcapsules; after raw materials are pretreated, the raw materials and a dispersing agent solution are added into a mixer respectively, spraying powder, a pretreated base body and the spraying powder are obtained after mixing treatment, spraying treatment is conducted on the surface of the base body through a plasma spraying method, and the self-lubricating aluminum coating is obtained after vacuum annealing treatment. Therefore, the obtained self-lubricating aluminum coating is low in friction coefficient, high in performance and excellent in self-lubricating property.

According to the cobalt-doped molybdenum disulfide lithium-sulfur battery composite positive electrode material, the preparation method and the application, a cobalt-doped stable molybdenum disulfide defect structure composite nitrogen-doped graphene material is prepared by combining a solvothermal method and an annealing technology, and the process is mature; the method is simple, and the composite positive electrode material with high sulfur content is easy to obtain. According to the lithium-sulfur battery composite sulfur positive electrode material disclosed by the invention, the strong chemical adsorption effect and catalytic conversion effect of the cobalt-doped stable molybdenum disulfide defect structure composite nitrogen-doped graphene carrier on polar lithium polysulfide are utilized, so that the diffusion of the lithium polysulfide in an ether electrolyte is inhibited, and the electrochemical reaction kinetics is improved; therefore, the shuttling effect is slowed down, and the lithium-sulfur battery has the characteristics of high capacity and long service life.

The invention discloses a miniature multi-ion sensing system based on a non-gate array and a preparation method thereof, and belongs to the technical field of electrochemical sensing, and the miniature multi-ion sensing system comprises a multi-ion sensing unit and a molybdenum disulfide non-gate array; the multi-ion sensitive unit comprises a metal electrode array, an ion sensitive film array and a liquid storage tank, multiple ions are detected through the ion sensitive film array at the same time and converted into electric signals, and the electric signals are transmitted to the molybdenum disulfide non-gate array through the metal electrode array; the molybdenum disulfide NOT gate array comprises a plurality of molybdenum disulfide NOT gates, and each molybdenum disulfide NOT gate comprises a metal electrode layer, a molybdenum disulfide layer, a NOT gate input end and a NOT gate output end, so that two field effect transistors are formed, received electric signals are amplified, the Nernst limit is broken through a NOT gate structure, and tiny changes of ion concentration are accurately detected. The sensitivity is higher; molybdenum disulfide is used as a channel material of the NOT gate, so that the size and power consumption of the NOT gate are effectively reduced, the integration level of the system is improved, and the service life of the system is prolonged.

The invention discloses a nano-diamond reinforced powder metallurgy brake pad friction body material and a preparation method thereof, and relates to a brake pad friction body material and a preparation method thereof. The problem that in the prior art, the stability of a braking system of a train at a high running speed cannot be achieved is solved. The friction body material comprises a matrix component, a lubricating component, a friction component and a basic reinforcing component, wherein the sum of the mass percentages of the matrix component, the lubricating component, the friction component and the basic reinforcing component is 100%; wherein the mass percent of the copper powder in the matrix component is 50%-70%, and the mass percent of the iron powder in the matrix component is 10%-30%; the mass percent of the lubricating component is 10%-20%; the mass percent of the friction component is 1%-5%; the mass percent of the nano-diamond in the enhanced component is 0.1%-1%; the friction component is composed of one or more of silicon dioxide, aluminum oxide, titanium carbide, tungsten carbide, silicon carbide powder and zirconium oxide powder; the lubricating component is composed of one or more of graphite, carbon nanotubes and molybdenum disulfide. Belongs to the technical field of powder metallurgy.

The application provides a preparation method of a self-coiled structure molybdenum disulfide / nitrogen-doped porous carbon composite material, a product and application, high-content nitrogen-doped porous carbon material is synthesized by inducing dicyandiamide molecules to undergo a supramolecular self-assembly process, and on this basis, a hydrothermal reaction is carried out to coat molybdenum sulfide sheet layer material on the surface, and finally, a self-heating coiling treatment is carried out to form a carbon-based electrocatalyst of the self-coiled structure molybdenum disulfide / nitrogen-doped porous carbon. Compared with a high specific surface area carbon-based catalyst, high doping concentration of nitrogen atoms can provide more electron-rich properties to facilitate the adsorption of substances, and the self-coiled carbon-based material can exhibit very excellent electrochemical performance, especially in the aspect of electrochemical hydrogen production. The preparation method is simple in operation, low in preparation cost and suitable for large-scale production.

The invention provides a ruthenium-based carbon dioxide hydrogenation catalyst based on MoS2 as well as a preparation method and application of the ruthenium-based carbon dioxide hydrogenation catalyst. The carbon dioxide hydrogenation catalyst comprises silicon dioxide, ruthenium and molybdenum disulfide, and the ruthenium and the molybdenum disulfide are loaded on the silicon dioxide. Therefore, in the carbon dioxide hydrogenation catalyst, the molybdenum disulfide is used as an auxiliary agent, so that the generation of methane (CH4) can be remarkably inhibited while a high CO2 conversion rate is maintained, the reversion of a product from CH4 leading to carbon monoxide (CO) leading is realized, and the inherent core defects that an existing Ru-based CO2 hydrogenation catalyst is too high in methanation activity, low in CO selectivity and difficult to consider activity-selectivity at the same time are overcome.

The invention discloses a high-transmission-rate optical cable with a low attenuation characteristic and a preparation method thereof, belongs to the technical field of optical cable communication, and is used for solving the technical problem that the transmission performance and the mechanical performance of an optical cable in the prior art need to be further improved. According to the optical cable, the polytetrafluoroethylene is filled with the modified graphene and the molybdenum disulfide, so that the mechanical property and the environmental adaptability of the optical cable are effectively improved, and the transmission speed of the optical cable is also effectively improved.

The invention discloses a preparation method of a functionalized molybdenum disulfide / silicon dioxide hybrid filler, and belongs to the technical field of nano hybrid materials. The core innovation of the invention lies in that the technical problems of poor dispersibility and weak interface bonding of single MoS2 in a polymer matrix are solved through a step-by-step chemical modification and directional bonding strategy. Chlorinated trimellitic anhydride is adopted to carry out carboxyl functionalization on MoS2, meanwhile, a silane coupling agent KH550 is utilized to carry out amino modification on SiO2, and active sites are provided for two-phase interface chemical bonding. The mechanical reinforcing characteristic of MoS2 is combined with the dispersion regulation and control capability of SiO2, so that the dispersion uniformity and interface bonding strength of the hybrid filler in a polymer matrix are remarkably improved. After the MoS2 / SiO2 hybrid filler is introduced into an epoxy resin matrix, the MoS2 / SiO2 hybrid filler not only has higher tensile strength, impact strength, glass transition temperature, surface energy and volume resistivity and lower friction coefficient, but also has better economic benefits and social benefits.

The invention relates to a normal-temperature curing high-corrosion-resistance self-lubricating composite coating which is prepared from the following components in parts by weight: 25 to 35 parts of modified epoxy resin, 12 to 22 parts of waterborne polyurethane-acrylate copolymer, 6 to 14 parts of lubricating filler, 4 to 9 parts of corrosion-resistant filler, 10 to 18 parts of composite curing agent, 1 to 4 parts of dispersing agent, 0.5 to 3.5 parts of flatting agent, 0.8 to 2.5 parts of defoaming agent and 35 to 55 parts of auxiliary solvent. According to the coating disclosed by the invention, an interpenetrating network matrix is constructed through modified epoxy resin and a waterborne polyurethane-acrylate copolymer, and is matched with components such as a nano molybdenum disulfide / graphene composite lubricating filler and a nano titanium dioxide-zinc oxide composite corrosion-resistant filler, and a photoinitiator-amine composite curing agent is combined, so that dual curing is realized. The coating has excellent properties of rapid curing at normal temperature, high corrosion resistance, self-lubrication and the like, is low in VOC content and wide in application range, and provides an innovative solution for the field of surface protection.

The utility model discloses a release film with low stripping force. The release film consists of a PET (Polyethylene Terephthalate) base material, a molybdenum disulfide layer deposited on the surface of the PET base material and a self-repairing coating coated on the outer side of the molybdenum disulfide layer. The utility model further provides a preparation system for the low-stripping-force release film. The preparation system comprises an ultrasonic cleaning machine, a drying machine, a chemical vapor deposition reactor, a mixing machine, a spin-coating machine, a drying box and a curing oven, an outlet of the ultrasonic cleaning machine is connected with the drying machine, an outlet of the drying machine is connected with the chemical vapor deposition reactor, an outlet of the chemical vapor deposition reactor is connected with the spin coater, an outlet of the mixing machine is also connected with the spin coater, an outlet of the spin coater is connected with the drying box, and an outlet of the drying box is connected with the curing oven. Through the combined design of the multi-layer structure of the molybdenum disulfide layer and the self-repairing coating, the release film is easy to strip, adhesion residues are reduced, and the use experience of a product is improved.

The invention provides a functional composite suspended biological carrier and a preparation and application method thereof. The functional composite suspended biological carrier comprises a main base material and functional components, the main body base material is polyethylene or polypropylene, and the functional component comprises the following substances in parts by mass: 3.0 parts of polyquaternium-10 or cationic polyacrylamide, 1.5 parts of molybdenum disulfide, 2.5 parts of vinyl acetate or acrylate, 2.0 parts of nano silicon dioxide, 2-3 parts of talcum powder, 0.5 part of a silane coupling agent and 0.5 part of polyethylene wax; the total proportion of inorganic components in the carrier is less than or equal to 12%; the cross section of the carrier is a 19-hole honeycomb hollow cylinder, the diameter of the formed cylinder is 25 mm, the height of the formed cylinder is 10 mm, and the density of the carrier is 0.95-1.00 g / cm; according to the invention, the state of charge on the surface of the carrier is adjusted through the positive electricity polymer PQAS-10, the affinity with negatively charged microorganisms is enhanced, the biofilm culturing period is obviously shortened, and by introducing molybdenum disulfide and a composite conductive structure thereof, a surface micro-conductive network is established, and the microbial metabolism efficiency under aerobic and facultative conditions is improved.

The invention relates to a wear-resistant modified glass fiber and a preparation method thereof, and belongs to the technical field of high polymer materials. The wear-resistant modified glass fiber is prepared from the following components in parts by weight: 40 to 60 parts of SiO2, 10 to 15 parts of Al2O3, 20 to 30 parts of CaO, 1 to 3 parts of Fe2O3, 1 to 3 parts of CeO2, 2 to 10 parts of modified toughening agent and 2 to 10 parts of wear-resistant filler, the flexibility and elasticity of polydopamine in the modified toughening agent can reduce the generation and expansion of cracks, and polydopamine cooperates with modified silicon nitride to increase the toughness and the adhesiveness and bonding performance of polyethyleneimine, so that the material is not easy to damage when bearing an external force; graphite oxide in the wear-resistant filler endows strength and heat resistance, molybdenum disulfide provides lubricity, a pre-product contributes to improvement of interface performance, and polytetrafluoroethylene and molybdenum disulfide synergistically improve wear resistance and lubricity; the wear-resistant modified glass fiber prepared by the invention not only has a good toughening effect, but also has an excellent wear-resistant effect.

The invention relates to the technical field of kits, in particular to a MoS2 back gate field effect transistor based on a wet transfer process and a preparation method of the MoS2 back gate field effect transistor. The MoS2 back gate field effect transistor is formed by sequentially arranging a silicon-based substrate, a SiO2 insulating layer, a MoS2 conducting channel layer and an Ag source drain electrode from bottom to top; a high-quality single-layer MoS2 thin film is prepared through a chemical vapor deposition (CVD) method, PMMA is adopted as a supporting layer, clean Van der Waals contact of the MoS2 thin film and a SiO2 / Si substrate is achieved through a wet transfer process of NaOH solution etching, deionized water cleaning and acetone stripping of the supporting layer, and finally a source electrode and a drain electrode are prepared by combining photoetching and thermal evaporation processes. According to the method, the problems of pollutant residues and traps of an interface between MoS2 and the substrate in the traditional process are effectively solved, the carrier mobility, transconductance and on-state current of the device are remarkably improved, the sub-threshold swing is reduced, and the method is suitable for manufacturing a two-dimensional material integrated circuit device with low power consumption and high performance.

The invention relates to a salt-resistant biomass interface evaporation material as well as a preparation method and application thereof, and relates to the technical field of interface evaporation materials. The preparation method comprises the following steps: mixing sunflower fiber dispersion liquid, polyvinyl alcohol and carbon-containing molybdenum disulfide, then adding glutaraldehyde, then carrying out liquid nitrogen freezing and freeze drying, sequentially soaking with a tannic acid solution, a calcium chloride solution and a ferric chloride solution, and then carrying out freeze drying. Natural sunflower fibers are used as a main framework, cotton is used as a supporting material, carbon-containing MoS2 is prepared and crosslinked with polyvinyl alcohol, a hydrophilic functional layer is constructed on the surface of the material through tannic acid, and the tannic acid is coordinated and complexed with Ca and Fe < + >, so that a more stable hydrophilic complexed coating is formed on the surface of the material; the surface wettability and the water conveying capacity of the material are further improved, meanwhile, salt crystal deposition and precipitation in the seawater evaporation process are effectively inhibited, and the oxidation resistance and the seawater corrosion resistance of the material are improved.

The invention provides a negative active material, a negative pole piece, a lithium ion battery and an electric device, and belongs to the technical field of batteries. The negative electrode active material has the core-shell structure, the coating layer is arranged on the surface of the graphite core, and through the synergistic effect of molybdenum disulfide in the coating layer and a carbon material except graphite, lithium ions can be rapidly conducted into crystal lattices of graphite for embedding, so that the electron transmission efficiency and the ion diffusion rate of the negative electrode active material are improved, and the service life of the negative electrode active material is prolonged. Therefore, the rate capability and the cycle performance of the negative electrode active material are improved, and the lithium precipitation phenomenon is relieved.

The invention discloses a preparation method and application of an iron-doped molybdenum disulfide / polymer-based composite solid-state electrolyte, and relates to the technical field of solid-state batteries. After the iron element is doped, defects are introduced into the structure of the modified molybdenum disulfide, phase change is induced, dissociation of the lithium salt is promoted through synergism of the modified molybdenum disulfide and the iron element, and more free lithium ions are released; and meanwhile, the proportion of an amorphous region of the polymer electrolyte is increased, so that the ionic conductivity is improved, and the oxidation resistance is enhanced. In addition, the iron-doped molybdenum disulfide can effectively catalyze decomposition of lithium salt anions, and construction of a uniform and stable solid electrolyte interface (SEI) layer on the surface of the electrode is facilitated. The all-solid-state lithium metal battery assembled based on the modified solid electrolyte shows excellent electrochemical performance.

There is disclosed a hybrid system for generating free energy from dam-water by integrating giant turbines with piezoelectric nanogenerators and solar cells. This three-in-one generator harnesses electrical energy from solar and mechanical energy. Strategically positioned large-scale turbines convert the kinetic energy of water flow into electrical energy. Concurrently, integrated piezoelectric nanogenerators transform mechanical stress from turbine operations into electrical energy via the piezoelectric effect. These nanogenerators function as self-charging hybrid supercapacitors (SCHSCs), featuring activated carbon (AC) electrodes and PVA-KOH-BTO electrolyte. Solar panels utilizing dye-sensitized solar cells (DSSCs) with TiO2 photoanodes, molybdenum disulfide (MoS2) counter electrodes, an iodine-based electrolyte, and dyes enhance energy conversion efficiency under varying solar conditions. The system efficiently generates electricity even under low-flow conditions, minimal sunlight, or when turbines are not operating at full capacity.

The invention provides polymer foam with high photothermal conversion efficiency and a preparation method of the polymer foam. The polymer foam with high photothermal conversion efficiency comprises a melamine three-dimensional foam skeleton and a single-layer MoS2 nanosheet which is polymerized on the melamine three-dimensional foam skeleton in situ, according to the scheme, single-layer molybdenum disulfide is uniformly introduced into a three-dimensional polymer skeleton based on an in-situ polymerization process, so that the three-dimensional structured evaporator with high photothermal conversion efficiency, excellent salt crystallization resistance and a simple processing process is constructed.