136 results about "Tungsten disulfide" patented technology

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 relates to the technical field of materials, in particular to preparation of an amphiphilic tungsten disulfide nano material and application of the amphiphilic tungsten disulfide nano material in preparation of an oil displacement agent. The oil-displacing agent prepared from the amphiphilic tungsten disulfide nano material can reduce the interfacial tension of an oil-water interface, and can be quickly adsorbed to the oil-water interface to layer oil and water; the surface wettability of the rock is changed, the lipophilicity of the rock is changed into weak hydrophilicity, and the pore throat cannot be blocked due to excessive hydrophilicity while the oil phase is stripped. The nano oil-displacing agent disclosed by the invention can still have an enough stable use effect after being frozen at a low temperature and then unfrozen.

The invention discloses a tannic acid modified tungsten disulfide nanosheet and application thereof in treatment of acetaminophen acute liver injury, the nanosheet takes a tungsten disulfide nanosheet as a core, and the surface of the tungsten disulfide nanosheet is modified with electronegative tannic acid. The nanosheet disclosed by the invention has good stability and biocompatibility, can be used for preparing a nano-drug for treating acetaminophen acute liver injury, and specifically targets and removes active oxygen at a liver injury part through an electrostatic adsorption effect, so that inflammatory response is inhibited, and symptoms caused by the acute liver injury are effectively relieved.

The invention belongs to the technical field of integrated photonic devices, and particularly relates to an electric tuning silicon nitride waveguide multimode interference coupler based on a two-dimensional material covering layer. In order to solve the problem that an existing silicon nitride photonic device lacks effective electro-optical regulation and control capacity, a two-dimensional material covering layer (such as molybdenum disulfide and tungsten disulfide) is integrated on the surface of a silicon nitride waveguide, and an up-and-down structure of a metal electrode-two-dimensional material-silicon dioxide cladding-silicon nitride waveguide is constructed. When external bias voltage is applied, the effective refractive index of the waveguide mode is changed through evanescent field coupling by means of the electrical refraction effect of the two-dimensional material, and active regulation and control of the optical path of the silicon nitride waveguide without the thermo-optic effect are achieved. Compared with a lithium niobate-silicon nitride heterogeneous integration scheme, the two-dimensional material with the atomic layer thickness is compatible with the CMOS technology, a complex heterogeneous bonding technology is not needed, and the advantage of monolithic integration is achieved. The device is particularly suitable for a reconfigurable optical signal processing device in a silicon-based photon integrated circuit.

The invention provides a long-acting lubricating method for forming transition metal sulfide on the surface in situ, and belongs to the technical field of friction chemical synthesis and lubrication. The preparation method comprises the following steps: mixing an active sulfur-containing hydrogen bond donor with a hydrogen bond acceptor to obtain a sulfur-containing eutectic solvent; a sliding friction pair is formed by a substrate material and a pair, the sulfur-containing eutectic solvent is added to a contact area of the sliding friction pair and reaches an immersed state, friction is carried out, and the substrate material contains transition metal elements. Based on a friction chemical reaction mechanism, a sulfur-containing eutectic solvent is used as an active sulfur source, and stress and heat of a friction interface are utilized to develop a system for carrying out in-situ vulcanization reaction on the surface containing transition metal elements to generate transition metal sulfide with a lubricating property; the problem of performance degradation caused by friction loss and difficulty in supplement of transition metal sulfides such as molybdenum disulfide and tungsten disulfide in the use process of the traditional lubricant is solved, and the service life of a lubricating system is greatly prolonged.

The invention provides a perovskite / silicon laminated solar cell and a preparation method thereof. The perovskite / silicon laminated solar cell comprises a silicon substrate cell, a hole transport layer, a perovskite light absorption layer, an electron transport layer, a functional layer and an electrode which are sequentially laminated, the material of the electron transport layer comprises tungsten disulfide, and the material of the perovskite light absorption layer comprises a rare earth doped perovskite material. The perovskite / silicon laminated solar cell has high charge transmission capability and space environment endurance capability, is especially suitable for space scenes such as near-earth orbit satellites, and has high stability and environment adaptability.

The invention discloses a width gradient tungsten disulfide nanobelt, a preparation method thereof and an application of the width gradient tungsten disulfide nanobelt in a self-driven photoelectric detector, a Ni film is deposited on a substrate and is annealed to form catalytic particles, and a chemical vapor deposition system is utilized to accurately control the temperature gradient between tungsten trioxide in a central temperature zone and a growth substrate in a downstream temperature zone, so that the width gradient tungsten disulfide nanobelt is obtained. And the solid sulfur source is propelled at a constant rate, the dynamic change of the sulfur / tungsten atomic ratio in the reaction environment is regulated and controlled, and a growth mode is guided to be converted from a gas-liquid-solid mechanism to a gas-solid mechanism, so that controllable preparation of the tungsten disulfide nanobelt with the width continuously and progressively decreased in the axial direction is realized. The width of the nanobelt gradually changes from 150-500 nm to 50-120 nm, the length of the nanobelt reaches 3-12 [mu] m, and the nanobelt has an armchair edge and a 3R phase stacking structure. A self-driven photoelectric detector constructed based on the nanobelt realizes high-sensitivity detection of 532 nm laser under zero bias voltage, the responsivity reaches 5.04 A / W, the detectivity reaches 3.23 * 10 < 12 > Jones, and the nanobelt shows important application value in the fields of optical signal detection, optical switches and wireless optical communication.

The invention relates to the technical field of sliding materials for seismic mitigation and isolation supports, and particularly discloses a self-lubricating wear-resistant composite material for a building seismic mitigation and isolation support and a preparation method of the self-lubricating wear-resistant composite material. The self-lubricating wear-resistant composite material for the building shock absorption and isolation support comprises the following raw material components: aliphatic polyketone, polytetrafluoroethylene, high polystyrene resin modified methyl vinyl silicone rubber, silicone resin, solid lubricating particles, silicone oil, a compatilizer, an antioxidant, a stabilizer and a coupling agent. The solid lubricating particles comprise the following raw material components: tungsten disulfide and hexagonal boron nitride. The self-lubricating wear-resistant composite material for the building shock absorption and isolation support prepared by the invention can keep a low and stable friction coefficient and excellent wear resistance for a long time, the dependence on external lubricating grease is remarkably reduced, and the technical problems that the self-lubricating performance of an existing support material is quickly attenuated, the maintenance is frequent and the cost is high are solved.

The invention discloses a p-type tungsten disulfide nanotube bundle, a preparation method thereof and application of the p-type tungsten disulfide nanotube bundle in a photoelectric detector with adjustable light response linearity, and the method comprises the following steps: depositing an Au film on a SiO2 / Si substrate, and carrying out annealing to form a zero-dimensional Au nanoparticle catalytic layer; the method comprises the following steps: respectively placing tungsten trioxide (WO3) powder and sulfur (S) powder in different areas of a single-temperature-area tubular furnace, heating to 850-1000 DEG C in an Ar / H2 mixed gas low-pressure atmosphere, and reacting to generate a WS2 nanotube bundle with a multi-wall hollow structure; the obtained material has a cluster-shaped morphology in dense interlaced distribution, and shows stable p-type conductive characteristics. A photoelectric detector prepared based on the material has high responsivity (2.7 * 10 < 4 > A / W), high detection rate (1.6 * 10 < 13 > Jones) and quick response (15 ms) in a wave band of 375-1550 nm, and keeps stable performance in a range of 10-300 K. The method is simple in process, the growth process of the tungsten disulfide nanotube bundle can be accurately controlled, the polarity of tungsten disulfide is changed to be p-type, and large-scale preparation can be achieved.

The invention discloses a WS2 negative electrode material and a preparation method thereof, a negative electrode and a supercapacitor, and the preparation method comprises the following steps: S1, carrying out the hydrothermal synthesis reaction of tungsten disulfide and germanium dioxide, and obtaining a doped material; s2, germanium dioxide in the doped material is extracted through a solution etching extraction method, and a porous WS2 material is obtained; and S3, carrying out hydrothermal reaction on the porous WS2 material, a cross-linking agent and zirconium dioxide to obtain the modified WS2 negative electrode material. Through the porous structure, crosslinking and ZrO2 doping, the negative electrode material can maintain high specific surface area and has structural stability and high conductivity at the same time, so that the large-current charge-discharge performance of the supercapacitor is remarkably improved.

The invention discloses a method for enhancing photoluminescence of single-layer tungsten disulfide through acid and application of the method, and particularly relates to the field of two-dimensional semiconductor materials. The method comprises the following steps: bonding a plurality of WS2 layered samples on a first substrate, forming a WS2 sheet layer on the surface of the first substrate, evaporating a metal film on the surface of the WS2 sheet layer, and forming a WS2 layer-metal film layer on the surface of the first substrate; transferring the WS2-metal film layer to a second substrate, and depositing on the second substrate to obtain a WS2 layer-metal film layer; removing the metal film layer by using an etching solution to obtain a WS2 sample on the surface of the second substrate; the second substrate with the WS2 sample attached to the surface is placed in a hydrobromic acid aqueous solution, and the acid-enhanced single-layer tungsten disulfide is obtained. According to the method, WS2 is subjected to acid treatment, and Br can fill up sulfur vacancies and reduce non-radiative recombination centers, so that a PL peak is close to intrinsic emission energy, and PLQY is improved.

The invention discloses a room-temperature DMMP sensor based on a platinum diselenide van der Waals heterojunction, and relates to the technical field of gas sensing. The sensor comprises an electrode, a platinum diselenide layer loaded on the surface of the electrode and a nano material loaded on the surface of the platinum diselenide layer, wherein the platinum diselenide layer and the nano material form a Van der Waals heterojunction; wherein the nano material is a low-dimensional nano material such as a carbon nano tube, graphene, zinc oxide, molybdenum disulfide or tungsten disulfide. The platinum diselenide / Van der Waals heterojunction sensor realizes trace detection of dimethyl methylphosphonate (DMMP) at room temperature by using excellent performance of platinum diselenide and a synergistic effect of the Van der Waals heterojunction, has the advantages of low working temperature, high sensitivity, good stability, high response speed and the like, and can meet DMMP detection requirements in the fields of environmental monitoring, public safety and the like.

The application discloses a flower ball-shaped bismuth disulfide / tungsten disulfide composite material and a preparation method and application thereof. Tungsten hexachloride is added into anhydrous ethanol solution and fully stirred, then bismuth nitrate pentahydrate is added into the mixed solution and stirred to uniformly disperse the bismuth nitrate pentahydrate into the solution, then thioacetamide is added and stirred to be uniform, the obtained solution is moved into a reaction kettle, and the reaction kettle is sealed and placed into a homogeneous reactor; after the reaction is completed, the product is taken out, washed and fully dried in a vacuum oven to obtain the composite material. The composite material has a thickness of 20-30 nm, and nanosheets are vertically grown on a self-assembled flower ball-shaped structure with a diameter of 350-400 nm; the composite material can be applied to preparation of a potassium ion battery negative electrode material, and the structure is more stable, the conductivity is better, and the electrochemical performance is greatly improved.

The application relates to a high-temperature heavy-load long-life knuckle bearing and belongs to the technical field of knuckle bearings. The knuckle bearing comprises a lubricating structure arranged between an outer ring and an inner ring; the first base material of a left half outer ring and a right half outer ring is Al 0.5 CoCrFeTa 0.4 Ni 2.1 High-entropy alloy is used for balancing strength and toughness and improving high-temperature mechanical property stability; the second base material of the inner ring is AlCoCrFeTa 0.8 Ni 2.1 High-entropy alloy; the inner ring and the outer ring are provided with an ion implantation layer, a CrAlN coating and an Ag coating; the surface hardness of the inner ring and the outer ring is improved, the bonding force between the CrAlN coating and the base is improved, frictional resistance is reduced, heat generated in the bearing operation process is led out, the solid lubricant material of the lubricating structure is tungsten disulfide which is filled in a groove; a continuous and stable lubricating transfer film is formed on a friction surface, and the service life is improved.

The invention provides a graphene-based lubricating oil additive as well as a preparation method and application thereof, and belongs to the technical field of industrial pump lubrication. The graphene-based lubricating oil additive provided by the invention comprises the following components in percentage by mass: 0.6-5% of a hydroxylated graphene-nano tungsten disulfide composite material, and hydroxylated graphene and nano tungsten disulfide in the hydroxylated graphene-nano tungsten disulfide composite material form an interlayer intercalation structure; 2-8% of nano magnesium aluminum silicate; 0.3%-1.2% of porous silicon dioxide elastic particles; 1%-5% of fluorinated carbon nanotubes; 0.5-2% of a corrosion inhibitor; and the balance of base oil. The graphene-based lubricating oil additive provided by the invention is used for lubricating a water pump, has an excellent cavitation damage repairing effect, is excellent in wear resistance and friction reduction performance, is beneficial to reducing the load current of a motor and improving the energy efficiency, and also has an excellent noise reduction effect.

The invention belongs to the technical field of solid lubrication, and discloses a self-lubricating repairing spray for a railway switch sliding plate and a preparation process of the self-lubricating repairing spray. The self-lubricating repairing spray comprises the following components in parts by weight: 15-20 parts of an adhesive, 16-21 parts of a lubricant, 5-8 parts of a wear-resistant agent, 0.22-0.4 part of an auxiliary agent and 35-45 parts of an organic solvent, the adhesive adopts epoxy modified polyimide resin, and the lubricant is selected from one or more of molybdenum disulfide, tungsten disulfide and polytetrafluoroethylene. The self-lubricating repairing spray is used for spraying and repairing a sliding plate which is worn after being used for a period of time, the lubricating and wear-resisting performance of the sliding plate can be effectively kept, switch equipment maintenance is facilitated, a new sliding plate does not need to be replaced or lubricating paint does not need to be smeared again, the labor intensity of maintenance workers and the equipment cost are greatly reduced, and the maintenance efficiency is improved. And the normal operation of the railway switch is ensured.

The application discloses a high-temperature heat-stable two-dimensional field effect transistor and a preparation method, and mainly solves the problem that two-dimensional materials in the two-dimensional field effect transistor are oxidized and decomposed at high temperature. The two-dimensional field effect transistor comprises, from bottom to top, a substrate (1), an insulating encapsulation protection bottom layer (2), a two-dimensional material thin film layer (3), an insulating encapsulation protection top layer (6), a gate electrode (7), source electrodes (4) and drain electrodes (5) at two ends of the thin film layer (3), and the encapsulation protection bottom layer and the encapsulation protection top layer are both made of any one or a plurality of combinations of aluminum nitride, hexagonal boron nitride or silicon nitride, so that oxygen molecules in air are prevented from diffusing to the two-dimensional material thin film layer to react at high temperature, and the two-dimensional material thin film layer plays a role in high-temperature protection; the two-dimensional material thin film layer is made of molybdenum disulfide, tungsten disulfide or tungsten diselenide. The two-dimensional field effect transistor has improved high-temperature resistance, and the oxidation and decomposition of the two-dimensional material at high temperature are avoided, and the two-dimensional field effect transistor can be used in aerospace, deep well drilling or other high-temperature environments.

This invention discloses a SnS / WS2@C composite electrode material, its preparation method, and its application, belonging to the field of tungsten disulfide nanomaterials technology. A precursor solution A is obtained by uniformly dispersing SnCl2·2H2O and CH3CSNH2 in anhydrous ethanol. After a solvothermal reaction, precursor solution A is cooled, centrifuged, washed, and freeze-dried to obtain powder B. Powder B, WCl6, and CH3CSNH2 are uniformly dispersed in anhydrous ethanol to obtain solution C. After a solvothermal reaction, solution C is cooled, centrifuged, washed, and freeze-dried to obtain powder D. Powder D is uniformly dispersed with glucose in deionized water to obtain precursor solution E. After a solvothermal reaction, precursor solution E is cooled, centrifuged, washed, and freeze-dried to obtain powder F. Powder F is calcined at high temperature to obtain the SnS / WS2@C composite electrode material. Performance testing of the prepared SnS / WS2@C composite electrode material revealed that it exhibits good electrochemical performance when used as a negative electrode in potassium-ion batteries.

The invention relates to the technical field of sewage treatment, in particular to preparation of a cobalt metal alkene-doped tungsten disulfide piezoelectric material and application of the cobalt metal alkene-doped tungsten disulfide piezoelectric material in synergistic degradation of antibiotics and hexavalent chromium. The material is prepared by combining a hydrothermal synthesis method with a chemical vapor deposition technology, and cobalt metal alkene is uniformly doped in a tungsten disulfide nanosheet layer to form a composite catalyst with excellent piezoelectric property. The material realizes efficient synergistic degradation of antibiotics and hexavalent chromium under the ultrasonic action, and has good cycle stability. The preparation method provided by the invention is simple and low in cost, and the obtained material has wide application prospects in the fields of sewage treatment, environmental remediation and the like, and is particularly suitable for efficient synergistic treatment of combined pollution.

The invention discloses a cushion block composite layer for a semiconductor, a preparation method and a cushion block, the cushion block composite layer sequentially comprises a composite coating and a surface microstructure from a substrate close to beryllium copper to a position far away from the substrate, and the composite coating sequentially comprises a chromium transition layer, an alpha-diamond-like carbon layer and a self-lubricating layer doped with tungsten disulfide from a position close to the substrate to a position far away from the substrate. Hard metal carbide reinforced phase crystal grains are uniformly distributed in the alpha-diamond-like carbon layer; the surface micro-texture comprises a plurality of pits, and each pit is filled with a nano-particle solid lubricant; through the structure, the cushion block is compatible with the high process temperature, an additional cooling device is not needed, and the interface shear stress of the composite layer is reduced, so that the copper powder falling amount is greatly reduced, the hardness, the wear-resisting life, the wear-resisting particle penetrability and the high recognition accuracy of the cushion block are greatly improved, and the low friction coefficient of the surface is maintained; and the roughness is still kept at a lower level after the lead frame is carried for multiple times.

The invention discloses a viscosity modified material for keeping the homogeneity of self-compacting concrete, a preparation method and application. The material comprises the following components in parts by mass: fly ash, slag powder, metakaolin, cellulose ether, limestone powder, zeolite powder, an air entraining agent, a functional component A and a functional component B, wherein the functional component A is prepared by compounding and drying nano silica fume, modified carbon nanotubes subjected to ultrasonic dispersion by sodium dodecyl benzene sulfonate / absolute ethyl alcohol and tungsten disulfide subjected to activation-silanization-polycarboxylic acid modification treatment, and the functional component B is prepared by shearing and uniformly mixing magnesium oxide and a calcium expanding agent at a high speed. The material can improve the viscosity, delay segregation and bleeding and reduce the water use sensitivity under the condition that the yield stress is not obviously improved, meanwhile, the early strength development is promoted, the volume stability is improved, and the durability such as chloride ion permeation resistance is improved, so that the homogeneity and quality consistency of a component in the pouring process and after hardening are guaranteed.

The invention discloses a preparation method of a nanoscale tungsten disulfide colloidal suspension, which belongs to the field of tungsten disulfide preparation, and comprises the following steps: step 1, adding tungsten disulfide powder into a solvent, and adding a surfactant or a stabilizer to obtain a mixed solution; step 2, carrying out tungsten disulfide interlayer stripping treatment on the mixed solution to generate a suspension containing nanosheets or nanoparticles with the transverse size of less than 100nm and the thickness of less than 5nm; 3, the suspension liquid obtained after ultrasonic treatment is subjected to centrifugal treatment, and supernate serves as preliminarily purified nanometer tungsten disulfide dispersion liquid; step 4, adjusting the pH value of the nano tungsten disulfide dispersion liquid to 7-8, and adding a polymer stabilizer to enable the absolute value of the Zeta potential of the system to be greater than 30mV; step 5, performing impurity removal and filtration on the suspension to remove residual micron-sized impurities; 6, the obtained filtrate is the prepared stable nanoscale tungsten disulfide colloidal suspension, and the stable nanoscale tungsten disulfide colloidal suspension is packaged into a preset container to be stored.

The invention belongs to the technical field of oil reservoir recovery efficiency improvement, and particularly discloses an amphiphilic Janus tungsten disulfide nano-emulsification tackifier and a preparation method and application thereof.The preparation method comprises the following steps that firstly, tungsten disulfide and a first oxidizing agent are added into a first solvent, and then tungsten disulfide with the surface modified with hydroxyl is obtained; thirdly, adding a second solvent and a first modifier, and then adding a first catalyst to obtain carboxyl modified tungsten disulfide; and finally, adding into a second solvent, and reacting with a second modifier and a third modifier to obtain the tackifying Janus tungsten disulfide nanosheet. The viscosity of the displacement front can be remarkably improved in the middle and later periods of oil reservoir development, the swept volume and the oil displacement efficiency are improved, the viscosity increasing rate of crude oil reaches 1192%, the excellent interfacial tension reducing capacity is achieved, the recovery efficiency is improved by more than 20%, and the recovery efficiency improving effect is remarkable.

A device includes a source region, a drain region, a two-dimensional channel formed of one of either molybdenum disulfide (MoS2) or tungsten disulfide (WS2), a gate positioned to control flow of current between the source region and the drain region in the two-dimensional channel, and a gate oxide directly integrated on the channel. A method of forming a gate oxide includes depositing a transition metal sulfur layer comprised of one or either amorphous MoSx or WSx on a substrate, where x >3, forming a layer of oxide on the transition metal sulfur layer, and annealing the transition metal sulfur to form one of either MoS2 or WS2.

The invention discloses a titanium trisulfide / tungsten disulfide heterojunction photoelectric detector for weak light detection and a preparation method and application of the titanium trisulfide / tungsten disulfide heterojunction photoelectric detector, and belongs to the technical field of micro-nano photoelectric device manufacturing. The photoelectric detector is sequentially provided with a silicon dioxide / silicon substrate, a titanium trisulfide nanosheet / tungsten disulfide nanosheet heterojunction and a metal electrode layer from bottom to top, the titanium trisulfide layer and the tungsten disulfide layer are partially overlapped, and two ends are respectively provided with a metal electrode. According to the photoelectric detector, titanium trisulfide and prepared tungsten disulfide form a heterojunction, the photoelectric detection performance under visible light is improved, the photoelectric detector has high response under irradiation of low-power-density visible light, and the heterojunction photoelectric detector fully embodies the advantages of the photoelectric detector under irradiation of weak light; and strong response detection under weak light is realized.

The invention relates to a method for manufacturing a component (1) comprising a metallic base body (2) with at least one coating (3) arranged at least partially on it, comprising the following steps: - Providing a metal strip (2a), - Providing at least one coating bath (5, 5') and at least partially passing the sheet metal strip (2a) through the at least one coating bath (5, 5'), wherein the sheet metal strip (2a) is electroplated, - wherein the coating (3) is formed by optionally forming a first layer (3a) of nickel on the sheet strip (2a), and by forming at least one second layer (3b) of a tin-nickel alloy in which particles (4) in the form of graphite and / or molybdenum disulfide and / or tungsten disulfide and / or polytetrafluoroethylene are incorporated, directly on the sheet strip (2a) and / or on the optional first layer (3a), and - Forming a coated area of ​​the sheet metal strip (2a) by means of a deep drawing process, whereby the component (1) is simultaneously or subsequently cut out of the sheet metal strip (2a).

The utility model discloses a helicopter self-lubricating swashplate which comprises a swashplate outer ring, a swashplate outer ring bearing is installed inside the swashplate outer ring, a swashplate inner ring is installed inside the swashplate outer ring bearing, and a fisheye bearing is installed inside the swashplate inner ring. A moving ring substrate of the fisheye bearing is of a honeycomb structure, and the honeycomb structure is filled with a graphite nanosheet and tungsten disulfide mixed lubricant. According to the new technology, a swash plate moving ring substrate is of a copper-based material surface structure and a honeycomb structure, and the honeycomb structure is internally pre-filled with a graphite nanosheet and tungsten disulfide mixed lubricant. And the overall shape is a fisheye sphere, so that the lubricating degree and the operating performance can be kept in a high-strength environment of multi-degree-of-freedom composite action.

The invention relates to a monatomic cobalt-loaded tungsten disulfide nanosheet catalyst and application thereof, and the monatomic cobalt-loaded tungsten disulfide nanosheet catalyst is prepared by the following method: carrying out solvothermal reaction on a sulfur-containing precursor and tungsten salt to prepare a WS2 nanosheet; putting the WS2 nanosheet into a ball mill, fully grinding, adding cobalt salt into the ball mill, and continuously grinding to obtain a black solid; and putting the black solid into a magnetic boat, introducing mixed gas, and carrying out heat treatment at 100-800 DEG C for 1-8 h to obtain the cobalt-loaded tungsten disulfide catalyst. The tungsten disulfide nanosheet is subjected to surface modification by utilizing a solid-phase ball milling method, cobalt monatomic is introduced to tungsten disulfide, and the catalytic activity of the monatomic cobalt-loaded tungsten disulfide nanosheet catalyst is improved by utilizing strong electron interaction between metal and a carrier.

The application discloses a quasi-solid-state sodium battery electrolyte and a preparation method and application thereof, and belongs to the technical field of sodium metal batteries. The quasi-solid-state sodium battery electrolyte provided by the application comprises a photocuring agent, a sodium ion electrolyte and a two-dimensional material; the two-dimensional material comprises one or more of fluorinated graphene, titanium nitride, boron nitride, silicon disulfide, tungsten disulfide and silicon carbide. The quasi-solid-state sodium battery electrolyte provided by the application has good mechanical strength and mechanical stability, can reduce the resistance of the quasi-solid-state sodium battery electrolyte, and improve the ionic conductivity; when the quasi-solid-state sodium battery electrolyte is applied to a sodium metal battery, the sodium metal battery has higher specific capacity under small and large rates, and can maintain long-time cycle stability.

The invention belongs to the technical field of lithium battery fire extinguishing materials, and particularly relates to an inorganic fullerene type sulfide-containing potassium-based fire extinguishing agent for lithium battery fire disasters, which comprises the following components: inorganic fullerene type sulfide, a mixture of polysiloxane and polyimide, a mixture of potassium carbonate and potassium phosphate, and alumina nanoparticles, a polyethylene glycol dispersant; wherein the inorganic fullerene type sulfide is inorganic fullerene type tungsten disulfide IF-WS2 or inorganic fullerene type molybdenum disulfide IF-MoS2 or a mixture of the inorganic fullerene type tungsten disulfide IF-WS2 and the inorganic fullerene type molybdenum disulfide IF-MoS2. The inorganic fullerene type IF-WS2 and / or IF-MoS2 are / is introduced into the fire extinguishing agent, and the combination technology of the potassium-based compound (potassium carbonate and potassium phosphate) and the polymer matrix (polysiloxane and polyimide) is combined, so that the comprehensive performance of the fire extinguishing agent in a lithium battery fire disaster is remarkably improved, and the fire extinguishing requirements of various scenes are met; and the fire prevention and control safety of the lithium battery is fundamentally improved.