149 results about "Graphite carbon" patented technology

The invention discloses an aircraft fairing and a fairing body composite material integrated forming process, and relates to the technical field of aviation equipment manufacturing. The forming process comprises the following steps: 1) preparing a prepreg; (2) sectional forming; 3) a curing process; (4) demolding and trimming; 5) an assembly process; the whole of the front section, the middle section and the tail section of the fairing is of a long-size U-shaped streamline structure. According to the invention, through molecular collaborative design of fluorination modification-polysiloxane toughening-cyanate ester interpenetration, the key contradiction of a high-performance fairing material is systematically solved; ultrahigh strength and toughness are realized at the same time by utilizing in-situ nano microphase separation; a dense graphite carbon layer is generated through catalysis, so that efficient halogen-free flame retardance is achieved; by means of the partition design of molecular fluorination and surface metallization, the high wave transmission and lightning protection functions are ingeniously unified. And finally, a new generation of aircraft fairing composite material with force bearing, wave transmission, heat resistance, impact resistance and environmental stability is successfully prepared.

The invention provides a low-temperature sodium-ion battery containing a modified negative electrode as well as a preparation method and application of the low-temperature sodium-ion battery. The low-temperature sodium-ion battery comprises a positive electrode, a negative electrode and an electrolyte, the negative electrode comprises negative electrode slurry, and the negative electrode slurry comprises an active substance, conductive carbon, sodium carboxymethyl cellulose and butadiene styrene rubber; the active substance comprises modified hard carbon; the modified hard carbon is prepared by oscillating and mixing hard carbon with a single-walled carbon nanotube, graphite carbon and soft carbon to obtain physical coating, further oscillating and mixing with the doped modified precursor powder, and calcining at high temperature to complete element doping and chemical coating; and the electrolyte comprises an additive selected from trimethylsilyl nicotinate, methyl 4-hydroxy-3-methoxycinnamate and the like. On one hand, the adhesive force of the negative electrode slurry on the current collector is improved, on the other hand, the solvent formula is optimized, the desolvation ability of sodium ions in the electrolyte is improved, the viscosity is reduced, and the additive is added to modify an electrode surface interface film, so that the charge-discharge performance of the battery at low temperature is improved.

The invention provides a surface modified carbon negative electrode material, a preparation method thereof and a battery. The preparation method comprises the following steps: mixing a graphite carbon source and a pore-forming agent, and graphitizing the obtained mixture to form porous graphite; performing oxidation treatment on the porous graphite to prepare porous graphite oxide particles; the porous graphite oxide particles are placed in a tin source solution containing tin cations, the tin source solution is attached to the surfaces of holes of the porous graphite oxide particles, and tin oxide attached to the surfaces of the holes of the porous graphite oxide particles is formed based on the tin source solution; and the porous graphite oxide particles are placed in a carbon-containing reducing gas environment to be subjected to calcination treatment, and the carbon-coated tin nanowires are prepared on the basis of the tin oxide. According to the preparation method, the surface and holes of the carbon negative electrode material are modified by adopting the carbon-coated tin nanowires, so that the discharge performance of the battery at relatively high rate can be effectively improved.

The invention belongs to the field of battery materials, and particularly relates to a preparation method of a quickly charged graphite negative electrode material suitable for low temperature, which comprises the following steps: carrying out controllable polymerization on graphite and a carbon source in advance at an oxidizing atmosphere and a temperature T1, and then carrying out carbonization treatment at a protective atmosphere and a temperature T2 to prepare a carbonized material; and mixing the carbonized material with an F-containing polymer, and carrying out micro-decomposition treatment at a temperature T3 to prepare the fast-charging graphite negative electrode material suitable for low temperature. The temperature of the temperature T1 ranges from 280 DEG C to 400 DEG C; the temperature of the temperature T2 ranges from 900 DEG C to 1300 DEG C; the temperature T3 ranges from 360 DEG C to 450 DEG C. The invention also comprises the material prepared by the preparation method and application of the material in a lithium ion battery. The material prepared by the preparation method disclosed by the invention has excellent low-temperature and fast-charging performance.

The application discloses a Fe self-catalytic in-situ lithium supplementing and graphite carbon-coated lithium manganese iron phosphate positive electrode material and a preparation method thereof, and belongs to the technical field of lithium batteries. 2+ Catalyze PAN to generate sp 2 Carbon, LiBOB-Li2O microcapsule in-situ lithium supplementing, and then ultra-high speed quenching to obtain the product. 2+ Self-catalysis, integration of carbon coating and in-situ lithium supplementing, greatly improving the conductivity, the first charge-discharge efficiency and the rate performance of the material, simple and controllable process, suitable for industrial production, and the prepared material has high compacted density and excellent cycle stability.

The invention belongs to the technical field of high polymer materials, and particularly relates to a low-friction machinable fluorine-containing composite material as well as a preparation method and application thereof. The middle-low friction machinable fluorine-containing composite material is prepared from the following raw materials in percentage by mass: 80-95% of fusible polytetrafluoroethylene and 5-20% of filler, the filler comprises any one or more of graphite, carbon fiber and polytetrafluoroethylene (PTFE). The low-friction machinable fluorine-containing composite material provided by the invention has low friction coefficient and high compression strength at the same time.

The utility model discloses an outdoor graphitized bamboo charcoal-based plate which comprises a core layer, a plurality of layers of laminated layers are symmetrically arranged on two sides of the core layer, the thickness of the core layer and the laminated layers is gradually reduced according to the gradient of the laminated layer from the core layer to the outermost side, graphite carbon layers are arranged between the core layer and the laminated layers, and graphite carbon layers are also arranged between the laminated layers. The surface of the plate is provided with a graphite carbon layer. The plate adopts a stress distribution homogenization design, namely, a layer thickness gradient design, so that stress concentration can be effectively dispersed and reduced, and the overall mechanical property and the damage resistance of the plate are improved. The graphitized bamboo charcoal has good thermal conductivity, hydrophobicity, mildew corrosion resistance and deformation resistance, meanwhile, the chemical stability of the non-graphitized bamboo charcoal is enhanced, and the graphitized bamboo charcoal is suitable for the fields of outdoor floors, wall decoration and the like and has wide market application prospects.

The invention relates to a micron carbon-based composite filter membrane material with a micro-nano aperture structure and a preparation method of the micron carbon-based composite filter membrane material. The micron carbon-based composite filter membrane material comprises an adsorbent material (a micron carbon-based porous adsorbent) and a binder material (a high-molecular binder), wherein the adsorbent is one or more of activated carbon, graphitized carbon black, porous graphite carbon, a metal organic framework-based porous carbon material, a carbon nanotube and a carbon molecular sieve. The invention has the advantages of acid and alkali resistance and capability of adapting to waste liquid treatment work in various environments, and also solves the problem of connection between an adsorbent and an adhesive interface, the problem of controllable pore size of a filter membrane, the problem of uncontrollable adsorption capacity of the filter membrane and the like. The method provided by the invention can be used in treatment of a variety of industrial wastewater, and has good social value and application value.

The invention discloses petroleum coke, a non-graphite carbon material, a negative electrode material and a preparation method thereof. The method comprises the following steps: performing first solid removal on a first heavy oil raw material to obtain first purified heavy oil; performing second solid removal on the second heavy oil raw material to obtain second purified heavy oil; mixing the second purified heavy oil with nano-porous carbon to obtain third purified heavy oil and heavy oil containing the nano-porous carbon; carrying out solid-liquid separation on the heavy oil containing the nano-porous carbon to obtain a non-graphite carbon material precursor and fourth purified heavy oil; mixing the third purified heavy oil, the fourth purified heavy oil and the first purified heavy oil to obtain heavy mixed oil; carrying out distillation, pyrolysis and modification treatment on the heavy mixed oil to obtain petroleum coke; carbonizing the non-graphite carbon material precursor to obtain a non-graphite carbon material; the negative electrode material is prepared from petroleum coke and a non-graphite carbon material. The petroleum coke and the non-graphite carbon material with relatively high quality are prepared, and the electrochemical performance of the negative electrode material can be improved.

The invention discloses battery black powder capable of recycling and regenerating graphite and a preparation method, and relates to the technical field of lithium battery recycling, and the battery black powder capable of recycling and regenerating graphite meets the condition that W is greater than or equal to 1.4 MPa <-1 >; wherein W = 1 / (P * M); p is the compressive strength of acid-insoluble substances in the battery black powder, and the unit is MPa; m is the thermal weight loss ratio of the acid-insoluble substances in the battery black powder under the anaerobic condition, and no unit exists. The larger the compressive strength of the acid-insoluble substance of the battery black powder is, the stronger the caking ability is, which results in that the subsequent crushing process is more difficult, which is not beneficial to the recovery and regeneration of graphite. Meanwhile, the higher the thermal weight loss is, the higher the non-graphite carbon content is, the graphite carbon capable of being recycled is correspondingly reduced, and recycling of graphite is not facilitated. The battery black powder meets the condition that W is larger than or equal to 1.4 MPa <-1 >, has good processing performance and high regeneration rate, and is more beneficial to subsequent preparation of regenerated graphite.

The invention is suitable for the technical field of graphite carbon plate processing, and provides a graphite carbon plate processing positioning mechanism which comprises a positioning table, a powder suction assembly is installed on the positioning table and used for collecting carbon powder generated by graphite carbon plate processing, and a horizontal displacement assembly and a clamping auxiliary assembly are further installed on the positioning table and used for collecting the carbon powder generated by graphite carbon plate processing. The graphite carbon plate positioning device is used for conducting auxiliary positioning on graphite carbon plates of different sizes, through the arrangement of the positioning assembly, the viscoelastic substance is pressed to form deformation, so that gaps between the graphite carbon plates and the positioning hopper are filled, and the sealing performance and stability between the graphite carbon plates and the positioning hopper are guaranteed through the design; by means of the design, displacement and unstable factors possibly occurring in the machining process are avoided, meanwhile, due to the integrated gas dust filtering unit, the equipment is protected, the service life of the equipment is prolonged, and the cleanliness of the production environment is further improved.

The invention discloses a method for recycling iron phosphate and graphite from residues obtained after valuable metal is extracted from waste lithium battery black powder. The method comprises the following steps: carrying out alkali solution reaction on ferrophosphorus residues obtained after lithium is extracted from lithium iron phosphate black powder, so that elements such as phosphorus, aluminum and titanium are all dissolved in a liquid phase, and the iron element generates ferric hydroxide which is left in alkali-soluble residues; the alkali-soluble residues are soaked in an ammonia complexing solution to remove impurities such as copper and nickel, and then are neutralized by an acid solution with relatively low concentration to obtain an iron salt solution and graphite carbon residues; oxidizing roasting, flotation, purification and drying are carried out on graphite carbon residues, negative electrode carbon residues obtained after valuable metal is extracted from waste ternary lithium battery black powder after optional preliminary purification, and graphite carbon residues obtained after lithium and ferrophosphorus are extracted from current lithium iron phosphate black powder, so that graphite can be recycled; and acid is added into the alkali dissolution filtrate to adjust the pH value to 6.0-9.0, and then the temperature is raised to hydrolyze impurity salts such as aluminum, titanium and chromium dissolved out of the phosphate solution to form hydroxides and metatitanic acid precipitates to be removed, so that finally, the quality of the iron phosphate prepared by the method disclosed by the invention is ensured to reach related standards.

This invention discloses a silicon-carbon composite material, its preparation method, and a lithium-ion battery, belonging to the field of lithium-ion battery material technology. The silicon-carbon composite material includes a core comprising a modified graphite carbon matrix and silicon material formed in the pores and surface of the modified graphite carbon matrix; and a coating layer formed on the surface of the core, the coating layer being a carbon layer. This invention uses modified graphite as the carbon matrix, with silicon material embedded in the pores and surface of the graphite. A first-phase carbon source and a second-phase carbon source synergistically coat the core to form a double-layer carbon coating structure, effectively improving the conductivity of the silicon-carbon composite material, suppressing the volume expansion of silicon material during the charging and discharging process of the lithium-ion battery, and improving the structural stability of the silicon-carbon composite material. When applied to lithium-ion batteries, the silicon-carbon composite material of this invention can effectively reduce expansion and improve rate performance and cycle stability.

The present application relates to the field of high-frequency microwave absorbing material and technology, disclose a kind of multifunctional electromagnetic material with high-frequency electromagnetic absorption and corrosion resistance characteristics and its preparation method and application, the multifunctional electromagnetic material is the core-shell structure with 10-100nm particle size, core is metal magnetic alloy component, shell layer is multilayer graphite carbon;It is obtained by carbonization treatment after dissolving and precipitating of metal salt, surfactant and organic ligand, the magnetic alloy component of core body in material and the graphite carbon matrix of shell layer form conductive network, conducive to the conduction loss caused by electron transition;Mutual hetero-interface is conducive to the interface polarization loss of electromagnetic wave.In addition, magnetic component provides strong magnetic loss, optimizes the impedance matching of wave-absorbing body, further enhances the attenuation ability to electromagnetic wave;And shell layer can effectively prevent the penetration and transmission of various corrosive media on the surface of target matrix, it is a kind of multifunctional electromagnetic material with high-frequency electromagnetic absorption and corrosion resistance characteristics.

The invention discloses a full-spectrum response type aerogel photocatalyst as well as a preparation method and application thereof. The full-spectrum response type aerogel photocatalyst has a multi-heterostructure, and the multi-heterostructure comprises an in-plane heterostructure of amorphous carbon, graphite carbon and a BCN ring and a TiO2 mixed crystal phase structure of anatase type TiO2 and rutile type TiO2. The catalyst can be applied to preparation of methanol through photo-thermal catalytic reduction of CO2 in any single wave band range or combined wave band range in ultraviolet light, visible light and near-infrared light; the preparation method of the full-spectrum response type aerogel photocatalyst comprises the following steps: a) preparation of reduced TiO2 nanoparticles; b) preparation of aerogel; and c) high-temperature carbonization. The aerogel photocatalyst not only can realize full-spectrum response, but also can realize in-situ generation and regulation of oxygen vacancies in photo-thermal catalysis, so that the efficiency of reducing CO2 to prepare methanol is improved.

The utility model belongs to the technical field of rotary drilling machines of mining equipment, and particularly relates to an air leakage and water leakage prevention sealing device for a static ring of a rotary trolley of a rotary drilling machine, which is characterized by comprising a static ring body, a copper bush grinding pad embedded in the static ring body, and two positioning pin holes formed in the edges of the two sides of the static ring body, the plurality of graphite carbon rods are uniformly distributed and embedded on the static ring body and are always in tight fit with a working surface, and the springs are respectively arranged at the lower part of each graphite carbon rod. The device is low in manufacturing cost and convenient to install; the lubricating and sealing effects of the static ring are greatly improved; spare part loss is effectively reduced, and drilling machine operation efficiency is improved; and safety accidents are avoided.

The invention discloses a rodlike carbon nitride-polydimethylsiloxane composite coating and a preparation method and application thereof.The rodlike carbon nitride-polydimethylsiloxane composite coating is prepared by mixing rodlike carbon nitride filler, polydimethylsiloxane and a curing agent, and even doping of the rodlike carbon nitride filler can effectively improve the crosslinking density of the composite coating; the adhesive force and the tensile strength of the coating are enhanced; when the composite coating is applied to the surface of a matrix, a multifunctional nano coating with mechanical reinforcement, long-acting corrosion prevention and microbial antifouling characteristics can be formed, the impedance arc radius is kept at 5.17 * 10 < 9 > omega.cm < 2 > after the composite coating is soaked for 60 days, and the composite coating shows excellent bacteriostasis and sterilization performance on chlorella and escherichia coli; the excellent biological pollution prevention characteristic is shown.

The invention relates to the technical field of metallurgy, in particular to a preparation method of a high-nitrogen vanadium-nitrogen alloy and the high-nitrogen vanadium-nitrogen alloy.The preparation method comprises the following steps that 1, wet-based industrial-grade ammonium vanadate, a graphite carbon powder reducing agent, a metal iron powder catalyst and a water-based binder are mixed and stirred according to the mass ratio of 100: (18-22): (0.2-0.5): (8-20), and a mixture is obtained; 2, the mixed material is subjected to compression molding, and a preformed material is obtained; and 3, the preformed material is sequentially subjected to low-temperature pre-sintering dehydration treatment, high-temperature nitridation reduction treatment and cooling annealing treatment, and the high-nitrogen vanadium-nitrogen alloy is obtained. According to the preparation method, industrial-grade wet-based ammonium vanadate is directly adopted as a raw material, pretreatment is not needed, and the production cost is further reduced.

The application relates to a preparation method of a high-performance carbon-silicon composite negative electrode material with a cell-like structure and application of the high-performance carbon-silicon composite negative electrode material with the cell-like structure. The application relates to a carbon-silicon composite negative electrode material and a preparation method thereof. The application aims to solve the problems of low specific capacity, poor cycle performance and large charge-discharge volume change of existing lithium ion battery negative electrodes. The method comprises the following steps: one, ball milling; two, preparation of a nano-silicon suspension; three, preparation of flake graphite primary-coated graphite carbon-silicon composite material; four, ball milling, sieving and secondary heating carbonization treatment, so that the high-performance carbon-silicon composite negative electrode material with the cell-like structure is obtained. The high-performance carbon-silicon composite negative electrode material with the cell-like structure is used as a lithium ion battery negative electrode material. The initial discharge specific capacity of the high-performance carbon-silicon composite negative electrode material with the cell-like structure prepared by the application can reach 1650 mAh / g, the discharge capacity can be kept above 800 mAh / g after 300 cycles, and the coulombic efficiency can be stabilized above 99%.

The present application provides a kind of positive electrode material for lithium secondary battery, its preparation method, the positive electrode comprising the positive electrode material and the lithium secondary battery comprising the positive electrode.The low cobalt positive electrode material for lithium secondary battery has core-shell structure, wherein the core layer is lithium nickel manganese aluminum ternary positive electrode material, the shell layer is three-dimensional conductive array network assembled by graphite carbon nanosheet dispersed with cobalt-rich low-nickel cluster, and the composition of the cobalt-rich low-nickel cluster is nickel-doped lithium cobaltate.

A graphitic carbon material for a negative electrode of a lithium ion secondary battery, in which a crystallite size Lc (002) determined by X-ray diffraction is from 35 nm to 150 nm, and a tap density is 0.90 g / cm3 or more.

The invention discloses an antifriction and wear-resistant composite metal coating material based on MoS2 and a preparation method thereof in the field of metal coatings, double low-friction components are formed through MoS2 and a nitrogen-doped carbon graphite material, low-friction coefficient stability can be achieved, and the antifriction and wear-resistant composite metal coating material is far superior to a traditional metal coating; meanwhile, the metal-metal sulfide composite supporting phase endows the coating with high hardness and high toughness, the wear rate can be controlled and kept at a low level, and the core contradiction that a traditional coating is poor in wear resistance during friction reduction and poor in friction reduction during wear resistance is solved. In the invention, MoS2 is wrapped by a metal phase and nitrogen-doped carbon graphite carbon, contact with water molecules in air can be reduced, antifriction failure caused by generation of MoO3 is avoided, metal sulfide and metal elementary substance have excellent corrosion resistance, a corrosive medium can be prevented from permeating into the coating, and under corrosion-wear coupling working conditions (such as marine equipment and chemical pipelines), the corrosion resistance of the coating is greatly improved. The service life of the coating is longer than that of traditional coatings.

The invention belongs to the technical field of sensors, and discloses an aflatoxin electrochemical sensor as well as a preparation method and application thereof. The aflatoxin electrochemical sensor comprises a nano-graphite carbon paste electrode and a composite membrane loaded on the nano-graphite carbon paste electrode, the composite membrane comprises a perfluorosulfonic acid ion exchange polymer and a cationic quaternary ammonium salt surfactant. The aflatoxin electrochemical sensor disclosed by the invention is low in preparation cost and simple to operate, can be used for rapidly and accurately detecting aflatoxin B1, and has a very good application prospect.

This invention discloses a method for preparing a bilayer carbon-modified silicon anode material. It belongs to the field of energy conversion and storage technology. It includes the following steps: (1) ultrasonically treating silicon-based particles in an organic solvent, then adding a silane coupling agent to the above dispersion, heating and stirring, centrifuging and drying to obtain a silicon-based material A modified with a silane coupling agent on the surface; (2) dispersing A in an organic solvent, then adding an ionic liquid dropwise to the above dispersion, heating and stirring to obtain an ionic liquid-grafted material B; (3) dispersing material B and rGO material in ethanol, ultrasonically mixing, heating and stirring, and finally washing and drying the product to obtain material C; (4) mixing material C with graphite, degassing and stirring, then performing temperature-controlled sintering, and cooling to room temperature to obtain a bilayer carbon-modified silicon anode material with a first layer of strong linkage between rGO and silicon substrate, and a second layer of graphite carbon homogeneously coating rGO. The method of this invention uses ionic liquids, silane coupling agents, or a combination of the two as interfacial bonding materials to improve the interfacial bonding force of the coating material, thereby reducing the volume expansion of the silicon anode material during charge-discharge cycles, forming a continuously connected buffer layer to overcome the breakage of silicon particles, and improving the interfacial conductivity. It has a significant effect on improving the structural stability of the anode active material in lithium-ion batteries or lithium slurry batteries, and improves the long cycle life of the material.

The invention relates to the technical field of photocatalysis, and discloses a photocatalyst and a preparation method thereof.The photocatalyst comprises a 3D honeycomb-shaped nitrogen-doped graphite carbon loaded cobalt metal catalyst; the non-noble metal hydroxide is loaded on the surface of the 3D honeycomb-shaped nitrogen-doped graphite carbon loaded cobalt metal catalyst. The photocatalyst has sufficient active sites, can effectively improve the activation rate and conversion rate of reactants in a carbon dioxide reduction reaction, and also has relatively high carrier separation efficiency, so that the number of photo-induced electrons and hole pairs participating in photocatalysis is increased, and the reduction reaction has relatively high quantum efficiency.

The invention relates to the technical field of lithium / sodium ion battery negative electrode materials, in particular to a high-entropy phosphide negative electrode material with a double-carbon coating structure and a preparation method and application thereof.The method comprises the following steps that firstly, Cu, Ge, Sn, Ti, Si, phosphorus powder and a carbon material are mixed in proportion, ball milling is conducted, and a CuGeSnTiSiPx / carbon (CuGeSnTiSiPx / G) composite material is obtained; then, the CuGeSnTiSiPx / G composite material is dispersed in tetrahydrofuran, meanwhile, asphalt is added, stirring and mixing are conducted, and a mixture is obtained; and finally, carrying out high-temperature calcination on the mixture to obtain the high-entropy phosphide-based / graphite / carbon (CuGeSnTiSiPx / G (at) C) composite material. The CuGeSnTiSiPx / G composite material prepared by the invention comprises an outer compact carbon layer formed by coating asphalt carbon and an amorphous nano carbon layer structure of a high-temperature calcination performance outer layer. The double-layer carbon can effectively maintain the structural stability of the high-entropy phosphide in the cyclic process, and the problems of volume expansion and low electronic conductivity of the high-entropy phosphide are prevented, so that the multiplying power and the long cyclic stability of the high-entropy phosphide are improved.

Semiconductor device assemblies are provided with one or more layers of thermally conductive material disposed between adjacent semiconductor dies in a vertical stack. The thermally conductive material can be configured to conduct heat generated by one or more of the semiconductor dies in laterally outward towards an outer edge of the assembly. The layer of thermally conductive material can comprise one or more allotropes of carbon, such as diamond, graphene, graphite, carbon nanotubes, or a combination thereof. The layer of thermally conductive material can be provided via deposition (e.g., sputtering, PVD, CVD, or ALD), or via adhering a film comprising the layer of thermally conductive material to one or more of the semiconductor dies.

This invention relates to the field of automotive reinforcement plate technology, specifically to a corrosion-resistant, high-rigidity right rear shock absorber mounting reinforcement plate and its preparation method. The plate comprises the following raw materials by weight: 100 parts matrix alloy powder, 8-12 parts additive A, 5-9 parts additive B, 3-5 parts graphite powder, 2-3 parts zinc stearate, 3-4 parts polyvinyl alcohol, 0.4-0.6 parts graphite carbon powder, and 0.8-1.5 parts electrolytic copper powder. In this invention, additive A is prepared as a composite additive through a zirconium precursor mixture and a magnesium precursor mixture, forming a uniformly dispersed zirconium-magnesium composite ceramic phase in the iron-based alloy matrix. This effectively refines the alloy grains, strengthens grain boundaries, and improves the stiffness and mechanical strength of the reinforcement plate. Additive B uses a potassium fluorotitanate and cerium nitrate composite treatment solution as its core, combined with polyaniline and sulfosalicylic acid for in-situ film formation, optimizing the sintering interface bonding force and effectively improving corrosion resistance life under salt spray conditions.

The invention provides a method for preparing a flexible micro-nano device based on a carbon film, and belongs to the field of micro-nano device manufacturing. The invention provides a preparation method of a carbon film for preparing a flexible electrochemical sensor, which comprises the following steps: coating a first substrate with slurry containing graphene oxide and a polymer, and then carrying out carbonization reaction to form a graphite-like carbon film. The graphene oxide and the polymer are carbonized to form a continuous carbon film structure with high flexibility, excellent conductivity and good adhesive force, and the carbonized film can directly realize patterned microstructure processing on a wafer-level substrate, has good structural uniformity and repeatability, and is suitable for integrated manufacturing of large-scale flexible microelectrode arrays.

The invention is applicable to the technical field of fuel cells, and provides a proton exchange membrane fuel cell graphite carbon plate fitting and sealing structure which comprises a first graphite carbon plate, a second graphite carbon plate and a proton exchange membrane structure arranged between the first graphite carbon plate and the second graphite carbon plate. Due to dual sealing of the inner sealing washer and the outer sealing rubber, gas leakage is effectively prevented, the sealing performance and the performance stability of the fuel cell are improved, the proton exchange membrane is ensured to be intact, and leakage of hydrogen and oxygen is avoided, so that the efficiency and the reliability of the cell are improved; an adhesive with high bonding strength and good elasticity, such as epoxy resin, polyurethane or modified acrylate, is used for bonding the bonding part of the first graphite carbon plate and the second graphite carbon plate, so that the sealing material has better adaptability, and the most suitable material can be selected according to the requirements of different application environments; the overall performance, the stability and the service life of the fuel cell are obviously improved.