97 results about "Cobaltous sulfide" patented technology

The invention belongs to the technical field of transition metal sulfide-carbon materials, and particularly discloses a cobalt-nickel sulfide / carbon nanofiber composite material and a preparation method and an application thereof. The method comprises the following preparation processes: preparing a carbon nanofiber through electrostatic spinning and high-temperature carbonization methods; and carrying out in-situ growth of a cobalt-nickel sulfide nanorod on the carbon nanofiber through a one-step hydrothermal method. The carbon nanofiber prepared by the method has the advantages of stable chemical property, good conductivity, good mechanical property and the like; the final cobalt-nickel sulfide / carbon nanofiber composite material is controllable in morphology; the cobalt-nickel sulfide nanorod uniformly grows on the carbon nanofiber; and a unique base structure and high specific surface area of the carbon nanofiber are fully utilized. The cobalt-nickel sulfide / carbon nanofiber composite material prepared by the method can be used as an ideal high-property electrocatalytic material, and an electrode material for new energy devices of a lithium-ion battery, a super capacitor and the like.

The invention discloses a formula of a thermal battery CoS2 cathode material and processing technology. The formula comprises the following components by mass: 70.5%-85% of cobaltous sulfide CoS2, 5%-15% of lithium oxide, 16%-25% of molten salts. The processing technology of the formula comprises the following steps: adding the cathode active substance of the cobaltous sulfide CoS2 material in an enamel disc, putting in a vacuum drying oven, performing high temperature dehydration at 90 DEG C-250 DEG C; performing high temperature sintering of the dehydrated cobaltous sulfide CoS2 at 290 DEG C-500 DEG C under inert gas protection for 4 h-8 h, cooling and sieving, adding 5%-15% of lithium oxide and 16%-25% of molten salts into the cobaltous sulfide CoS2, mixing and sintering at 330 DEG C-500 DEG C for 4 h-6 h, cooling to room temperature, sieving by a 80-mesh sieve so as to prepare the high temperature resistant thermal battery cathode composite material which is bottled to keep in reserve. The invention can improve the security of thermal batteries, and increase the active substance utilization rate.

The invention belongs to the field of thermal batteries, and relate to a carbon coated thermal battery electrode material and a preparation method thereof. Glucose and other carbon sources are added in the process of preparing cobalt disulfide through a hydrothermal method, and the cobalt disulfide electrode material with a carbon coated structure is prepared in situ; the mass content of carbon in the obtained material relative to cobalt disulfide ranges from 1% to 25%. The electrode material has the advantages of being high in specific capacity, good in air stability, simple in preparation process, easy to prepare in a large scale and the like.

The invention provides a cobalt nickel sulfide / cobaltous sulfide / carbon composite material and preparation and application thereof. The cobalt nickel sulfide / cobaltous sulfide / carbon composite material is characterized by comprising cobalt nickel sulfide / cobaltous sulfide nanowires and a carbon layer coated outside the cobalt nickel sulfide / cobaltous sulfide nanowires. The preparation process is simple, easy to operate, green, non-toxic and environmentally-friendly, and the prepared cobalt nickel sulfide / cobaltous sulfide / carbon composite material is stable in structure, uniform in shape and good in dispersion. The prepared cobalt nickel sulfide / cobaltous sulfide / carbon composite material can become an ideal electrode material of new energy devices such as high-performance supercapacitorsand lithium ion batteries.

The invention relates to a preparation method and application of a cobalt disulfide and carbon nano fiber composite material. The preparation method comprises the following steps: firstly, preparing carbon nano fiber by using an electrostatic spinning method; by taking N-N dimethyl formamide (DMF) as a solvent, preparing a polyacrylonitrile spinning solution, uniformly stirring, sucking into an injector, and performing electrostatic spinning; cutting a white film obtained after spinning into long strips, and performing thermal treatment in a tubular furnace so as to obtain a black carbon fiber film; activating with concentrated nitric acid, adding cobalt nitrate hexahydrate and thioacetamide so as to obtain a solution, performing ultrasonic treatment, further transferring the solution into a reaction kettle, and performing hydrothermal reaction; after the reaction kettle is cooled after reaction, taking out the carbon fiber, respectively washing the carbon fiber with distilled water and ethanol for multiple times, and performing vacuum drying, thereby obtaining the cobalt disulfide and carbon nano fiber composite material. The cobalt disulfide and carbon nano fiber composite material is used as an electrode material of a supercapacitor, and properties of the supercapacitor can be tested.

The present invention discloses a hollow micro-sphere possessing a multilayer cobaltous sulfide / cobaltous oxide shell and a preparation method and an application thereof. The preparation method comprises the steps of firstly adopting a low temperature solution precipitation method to grow a Co2CO3(OH)2 nanowire on the surface of a carbon sphere, calcining in the air to obtain the hollow micro-sphere possessing the multilayer Co3O4 shell, and then vulcanizing the Co3O4 micro-sphere in a tube furnace to obtain the complete hollow micro-sphere possessing the multilayer cobaltous sulfide / cobaltous oxide shell. According to the present invention, the obtained powder is good in dispersity and uniform in size and has the controllable particle size, the reaction repeatability is high, and the preparation cost is low.

The invention discloses a supercapacitor combination electrode and a making method thereof. The supercapacitor combination electrode comprises a nickel wire mesh or copper wire mesh base layer, a Co3S4 nanosphere film outer layer and a three-dimensional graphene middle layer arranged between the base layer and the outer layer. The combination electrode is made by the following steps of: using a nickel wire mesh or a copper wire mesh as the base layer, growing the three-dimensional graphene layer on the base layer by a chemical vapor deposition method, and then growing the Co3S4 nanosphere film layer on the three-dimensional graphene layer by a hydrothermal method. The combination electrode disclosed by the invention has the advantages that the sandwich structure of the base layer, the three-dimensional graphene and cobaltous sulfide is an extremely stable superior structure, and the capacitance value of the electrode is higher than that of a common capacitor.

The invention discloses a method for preparing a cobalt-nickel sulfide counter electrode. The steps include: first step, hydrothermally reacting cobalt salt, nickel salt and excess sodium hydroxide or sodium carbonate at 120-200°C to generate hydrogen Oxycobalt nickel or basic cobalt nickel carbonate; the second step, mix the hydroxide cobalt nickel or basic cobalt nickel carbonate with a certain concentration of sulfur source aqueous solution, and heat it at 140-230 ° C; the third step is to generate the sulfur Cobalt nickel is made into a slurry and coated on a conductive substrate, and dried at room temperature. The electrode prepared by the invention does not need to be sintered under vacuum or protective atmosphere, and the preparation process is simple; the prepared cobalt-nickel sulfide counter electrode has high mechanical strength and no shedding phenomenon; Better electrocatalytic activity; Dye-sensitized solar cells assembled with cobalt-nickel sulfide electrodes obtained higher photoelectric conversion efficiency than dye-sensitized solar cells assembled with pyrolyzed Pt electrodes.

The invention belongs to the field of catalytic materials, and particularly relates to a three-dimensional graphene / carbon nano tube based molybdenum disulfide / cobaltous sulfide composite material electrocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: step I, treating a precursor: performing ultrasonic treatment on a certainamount of oxidized graphene and a modified carbon nano tube, adding ascorbic acid, thiourea and a metal ion precursor to be uniformly mixed, wherein the metal ion precursor is sodium molybdate and cobalt chloride; step II, performing a hydrothermal reaction process: transferring mixed composite into a reaction kettle, heating the composite to a temperature of 160-200 DEG C, reacting for 20-28 hours at the temperature, conducting cooling to the room temperature to obtain a gel-like black substance, and conducting washing and freeze-drying to obtain a cylindrical black solid. A graphene / carbonnano tube with a three-dimensional network structure provides a quick electron transfer path and an ion transport channel, and molybdenum disulfide / cobaltous sulfide with a nano structure is anchoredon three-dimensional structural carbon to expose more electro-active sites, so that electrochemical hydrogen evolution property is cooperatively improved.

The invention belongs to the technical field of transition metal sulfide / carbon materials, and particularly discloses a cobalt zinc sulfide / graphene / carbon nanofiber composite material and a preparing method thereof. The preparing method includes the steps that a polyacrylonitrile nanofiber film is prepared through electrostatic spinning, polyacrylonitrile nanofibers are wrapped by graphene oxide with a solution soaking method, then a graphene / carbon nanofiber composite film is prepared through high temperature carbonization, and cobalt zinc sulfide nanometer particles grow on the graphene / carbon nanofibers with a one-step hydrothermal method in an in-situ mode. The prepared cobalt zinc sulfide / graphene / carbon nanofiber composite material is controllable in morphology, has the high specific surface area and the good electrical conductivity, and can serve as an ideal high-performance electro-catalysis material and an electrode material of new energy devices such as a lithium-ion battery and a solar cell.

The invention discloses a polypyrrole-coated nickel cobalt sulfide nanotube material, which is composed of nickel foam, nickel cobalt sulfide nanotubes and a polypyrrole nano film, wherein the nickel cobalt sulfide nanotubes grow on the nickel foam to form a nickel cobalt sulfide nanotube array; polypyrrole continuously grows on the surfaces of the nickel cobalt sulfide nanotubes to form the polypyrrole nano film; and the polypyrrole nano film is tightly combined with the surfaces of the nickel cobalt sulfide nanotubes, and no gap is left. The invention also provides a method of preparing the polypyrrole-coated nickel cobalt sulfide nanotube material. The material is used as a super capacitor electrode material, and has the advantages that the specific capacitance is high, the rate capability is good, and the cycling performance is improved significantly.

The invention discloses a preparation method of cobaltous sulfide nickel / graphene composite gel. The following preparation raw materials are employed: graphene oxide (GO), cobalt salt, nickel salt, thioacetamide and 95wt% of ethyl alcohol and the like. The preparation method comprises: graphene oxide and ethyl alcohol are fixed and ultrasonic preparation is carried out to obtain a graphene oxide alcoholic solution; and in-situ growth of a cobaltous sulfide nickel microsphere on a graphene oxide sheet is carried out by a one-step hydrothermal method to obtain cobaltous sulfide nickel / graphene composite gel. According to the invention, the cost is low; and the preparation process is simple. The prepared cobaltous sulfide nickel / graphene composite gel has excellent electrochemical performanceand can be used as a positive electrode material of an asymmetric super capacitor.

The invention discloses a preparation method of carbon-coated cobaltous sulfide / cobaltous octosulfide nano particles having a multistage porous structure and an application thereof. Based on a solvothermal method, PAN is employed as a carbon source and is taken as a carrier of an active substance, the carbon-coated CoS / Co9S8 nano particles having a specific structure is obtained by adding a certain mass of sulfur powder through calcining and sulfuration under protection atmosphere, and the carbon-coated CoS / Co9S8 nano particles have the multistage porous structure. The multistage porous structure constructed by the carbon-coated active substance particles is in favor of full contacting of an electrolyte and an active substance, provides more reaction active sites, shortens diffusion distance of lithium ions, increases the multiplying power performance of a battery, alleviates volume expansion during a lithium insertion process, prevents powdering and shedding of the active substance, and greatly increases the cycle life of the battery. The preparation method has the advantages of easy operation, and controllable reaction condition, and is easy for an amplification experiment.

The invention belongs to the field of functionalized porous nanometer materials, and relates to a preparation method of a ferrocobalt sulfide nanotube loaded carbon sponge flexible composite material.The preparation method comprises the following specific steps: cutting commercial tripolycyanamide sponge, then washing with distilled water and absolute ethyl alcohol, after drying, in a nitrogen orargon atmosphere, burning the tripolycyanamide sponge through temperature programming, carrying out carbonization treatment, and cooling to obtain carbon sponge; preparing a mixed solution containinga ferric salt and a cobalt salt, immerging the carbon sponge into the mixed solution, adding a pH accessory ingredient, carrying out a hydrothermal reaction to obtain a ferrocobalt precursor-carbon sponge composite material, then immerging the ferrocobalt precursor-carbon sponge composite material into a vulcanizing agent solution, and carrying out a secondary hydrothermal reaction to obtain theferrocobalt sulfide nanotube loaded carbon sponge flexible composite material. According to the preparation method, the flexible, porous and self-supporting carbon sponge is taken as a growth template, and the difficulty that a nanometer material is easy to cluster is solved successfully; and the obtained composite material has a great number of exposed active sites, abundant holes and good conductivity.

The invention belongs to the field of environmental catalyst synthesis and discloses a graphene-based hollow cobaltous sulfide nanocrystal capable of efficiently activating persulfate and a preparation method thereof. The preparation method comprises the following steps: growing a zeolite-type imidazate frame 67 on the surface of graphene oxide by a precipitation method; taking the imidazate frame67 as a self-template, taking thioacetamide as a sulfur source, and preparing cobaltosic sulfide of a hollow structure by virtue of a solvothermal reaction; and finally, calcining in an inert atmosphere, converting the cobaltosic sulfide into hollow cobaltous sulfide by virtue of desulfurization reaction, and reducing graphene oxide into graphene, thereby obtaining the graphene-based hollow cobaltous sulfide nanocrystal. The hollow cobaltous sulfide nanocrystal prepared by the method disclosed by the invention has the advantages of high catalytic activity, high free radical yield, simple recycling and the like, can achieve the effects of enhancing the conventional oxidation method, obviously shortening the reaction time and greatly reducing the usage amount of the catalyst and oxidizing agent, and has obvious technical and economic advantages.

The invention discloses a preparation method for a cobaltous sulfide / nitrogen-doped mesoporous carbon material (CoSx@NMC) with bifunctional activities. The preparation method adopts a one-pot methodto prepare the mesoporous carbon material with oxygen reduction and oxygen evolution reaction in one step, i.e., a high polymer containing nitrogen and sulphur elements is used as an organic precursor, ferrous sulfate and cobalt sulfate are taken as metal precursors, the organic precursor and the metal precursors are evenly mixed under the assistance of solvent, and a mixture is subjected to high-temperature carbonization under an inert atmosphere to obtain CoSx in-situ loaded nitrogen-doped mesoporous carbon material of a 2-5nm size. By use of the method, under a blending function of double metals, on one hand, cobalt aggregation can be effectively inhibited, on the other hand, nitrogen active sites with efficient catalytic oxygen reduction and cobaltous sulfide particles with oxygen evolution activities are synchronously generated on a mesoporous carbon substrate, and the mesoporous carbon material which is finally obtained can be used on a zinc air battery to realize a long-time high-stability charging and discharging cycle.

The invention discloses a nano-cobalt / cobalt sulfide loaded heteroatom doped porous carbon composite catalyst and a preparation method and application thereof and relates to the technical field of nano composite catalysts and electrocatalysis. The composite catalyst is prepared by taking a nitrogen-sulfur-oxygen tri-heteroatom hybrid cobalt-based metal-organic frame material (shortened for Co-NSOMOF) as a precursor and is used for efficiently electrolyzing water. In a 1mol / L potassium hydroxide electrolyte, when the current density reaches 10mA / cm<2>, the battery voltage is relatively low (1.56V). After long-time cycle test, the catalyst still can keep relatively high catalytic activity, has relatively high stability and has a relatively high actual application value.

The invention provides a preparation method of an asymmetric supercapacitor, wherein the preparation method relates to the technical field of supercapitors. According to the preparation method, cuprous oxide is used for preparing a sacrificial template; cobaltous hydroxide is obtained through normal-temperature mixing; and sulfuration is performed on the cobaltous hydroxide according to a hydrothermal method for obtaining hollow cobaltous sulfide powder. The hollow structure can reduce diffusion distance of ions and improves utilization rate of active substances, thereby improving specific capacitance of a material. The cobaltous sulfide powder is used as an anode and a porous carbon material is used as a cathode, and the asymmetric supercapacitor is obtained through assembling. The supercapacitor has a wide potential window. Furthermore energy density and power density of the supercapacitor are improved.

The invention provides a carbon nanotube composite cobalt sulfide nanomaterial and a preparation method and application thereof. The preparation method comprises the following steps: uniformly mixinga cobalt salt solution, a zinc salt solution and a 2-methylimidazole solution, carrying out a reaction to obtain a precipitate, and washing and drying the precipitate to obtain a zeolite imidazate skeleton structure material; then roasting the zeolite imidazate skeleton structure material in an inert atmosphere to obtain a carbon nanotube composite metal cobalt nanomaterial; and finally, uniformlymixing the carbon nanotube composite metal cobalt nanomaterial with sulfur, and carrying out a sulfuration reaction in an inert atmosphere to obtain the carbon nanotube composite cobalt sulfide nanomaterial. The material can be used as an active material of an electrode. According to the invention, the zeolite imidazate skeleton structure material is subjected to high-temperature roasting to formcarbon nanotubes in situ, so material expansion is inhibited, an expansion amplitude is reduced, structural stability is improved, and a supercapacitor and a lithium-sulfur battery are allowed to have high capacity retention ratio after hundreds of times of cycles.

The invention relates to an electrolytic water oxygen evolution electrode and a preparation method thereof, in particular to a three-dimensional cobaltous sulfide oxygen evolution electrode and a preparation method thereof based on an electrodepositing technology. The method comprises the following steps that (1) cobalt salt and thiocyanate are dissolved in water, and a mixed solution is prepared;and (2) the aqueous solution prepared in the step (1) is used as an electrolyte, a conductive substrate is used as an electrode, a cobaltous sulfide material is grown on the conductive substrate through the electrodepositing technology, and prepared cobaltous sulfide is taken out, washed and dried. The three-dimensional cobaltous sulfide oxygen evolution electrode is prepared on the conductive substrate through the electrodepositing technology with simple steps and mild conditions. The oxygen evolution electrode has a microscopic morphology of a three-dimensional structure and has high reaction specific surface area so that more active sites can be exposed in an electrolyte solution to participate in an oxygen evolution reaction, and transmission of electrons and rapid escape of oxygen bubbles in the catalytic process are facilitated, so that the oxygen evolution electrode has good oxygen evolution catalytic performance and stability.

The invention belongs to the technical field of electrocatalysis and water treatment, and particularly relates to a preparation method and application of a cobalt disulfide / carbon fiber composite material. The preparation method comprises the steps: nitriding carbon fibers to obtain carbon nitride fibers; mixing cobalt ion salt, sodium thiosulfate, sublimed sulfur and ultrapure water to obtain a mixed solution; and mixing the carbon nitride fibers with a mixed solution, and carrying out hydrothermal reaction to obtain the cobalt disulfide / carbon fiber composite material. The cobalt disulfide / carbon fiber composite material is prepared by a one-step hydrothermal method, the preparation process is simple and safe, the reaction conditions are mild and controllable, and the cost is low. The invention also discloses the application of the composite material in in-situ production of hydrogen peroxide and synchronous degradation of organic pollutants in an electrocatalytic cathode.

The invention belongs to the technical field of lithium-sulfur batteries, and particularly relates to a coating material for a functional interlayer of a lithium-sulfur battery and a preparation method thereof. The coating material is a sea urchin-shaped carbon-coated cobalt sulfide composite material. When the coating material is coated on a functional interlayer of a lithium-sulfur battery, theobvious shuttle effect of polysulfide in the current lithium-sulfur battery can be effectively relieved, and the stable electrochemical performance of the battery is ensured.

The invention provides a metal cation doped cobalt polysulfide / cobalt hydroxide composite material and a preparation method thereof. A solvothermal method is adopted, firstly, metal cations are dopedinto a cobalt precursor growing on foamed nickel in situ, and the precursor is a two-dimensional nanosheet array with a hierarchical porous structure; then a self-supporting M-coated CoSx / Co (OH) 2 nanosheet material is prepared through a liquid phase vulcanization method; the preparation method is simple in process, short in consumed time and low in cost, and the prepared material has a hierarchical and mesoporous structure and a large specific surface area and provides more active sites; meanwhile, the transmission path of ions can be shortened, the interface resistance between the electrodeand an electrolyte is reduced, particularly, due to the doping of metal cations, the electronic structure of the electrode is effectively adjusted, the intrinsic conductivity of the material is optimized, the specific capacitance is as high as 3500 to 4000 F g < 1 >, and the electrode material is a novel high-performance supercapacitor electrode material.

The invention discloses a preparation method of a nickel-cobalt-tungsten polysulfide bifunctional catalyst with a core-shell spherical structure. The method comprises the following steps: firstly, dissolving a cobalt salt, a nickel salt and glycerol in a specific solvent, then putting a mixed solution into a stainless steel high-pressure reaction kettle taking polytetrafluoroethylene as a lining,carrying out heating reaction for a period of time, and then carrying out centrifugal drying to obtain a nickel-cobalt glycerol precursor; and carrying out tungsten doping and vulcanization treatmenton the precursor, ammonium tungstate and thioacetamide under a solvothermal reaction condition to finally obtain the quaternary tungsten sulfide doped cobalt nickel sulfide Co9S8-Ni3S2@WS2 catalyst. The preparation method has the advantages of easily available raw materials, low cost, simple process, short reaction time, unique catalyst morphology, high specific surface area and excellent electrocatalytic performance, can be applied to dye-sensitized solar cells, has photoelectric efficiency of 9.67%, and has good application prospects in the field of water electrolysis hydrogen production.

The invention discloses a low-temperature electrolyte for a lithium cobalt disulfide primary battery and the lithium cobalt disulfide primary battery. The low-temperature electrolyte comprises a lithium salt, a solvent and a first additive, wherein the total volume molar concentration of the lithium salt in the solvent is 0.5-2 mol / L, and the addition amount of the first additive is 0-10% of the total volume of the solvent; the lithium salt comprises any one or more than two of lithium bis (trifluoromethanesulfonate) imide, lithium iodide and lithium tetrafluoroborate; the solvent comprises any two or more than two of propylene carbonate, 1, 3-dioxolane and ethylene glycol dimethyl ether; and the first additive is selected from at least one of methyl acetate, ethyl acetate, ethyl acrylate,tetrahydrofuran, fluoroethylene carbonate and fluorodiethyl carbonate. The problem that an existing lithium primary battery cannot discharge or is low in discharge capacity at the low temperature of-40 DEG C is solved, and the high-rate discharge performance of the battery at the temperature of -40 DEG C can be remarkably improved through the provided electrolyte.

The invention belongs to the field of battery electrode materials, and discloses a preparation method of a CoS / Co9S8@C core-shell structure nano composite sodium ion battery negative electrode material, which takes ZIF-67 of a positive dodecahedron as a precursor and utilizes a nitrogen-containing carbon material to coat cobalt sulfide to form a carbon-coated positive dodecahedron CoS / Co9S8@C core-shell structure. The prepared CoS / Co9S8@C core-shell structure nano composite material is used as a negative electrode of a sodium ion battery, shows good sodium storage performance and stable cycle performance, and is a sodium ion negative electrode material which is low in price, simple, easy to obtain and environment-friendly.

The invention discloses an amorphous cobalt sulfide nanowire and a preparation method thereof. The amorphous cobalt sulfide nanowire comprises a carbon nano frame confinement structure and an amorphous cobalt sulfide nanowire wire filled in the carbon nano frame confinement structure, according to the method, the amorphous cobalt sulfide nanowire can be simply and efficiently prepared in low cost,and the prepared amorphous cobalt sulfide nanowire has high conductivity and a large specific surface area and has good application prospects in the field of ion batteries.

The invention provides a cobalt sulfide / g-C3N4 composite electrode material with a two-dimensional hollow nano-sheet structure and a preparation method thereof. The invention provides the preparationmethod of the cobalt sulfide / g-C3N4 with the two-dimensional hollow nano-sheet structure. Specifically, g-C3N4 is added into a reaction solution containing a cobalt salt, C4H6N2 and a solvent, cobaltions react with C4H6N2 to form a two-dimensional nano-sheet precursor in situ on the g-C3N4, then a sulfur source is added, and the cobalt sulfide / g-C3N4 composite electrode material with the two-dimensional hollow nano-sheet structure is obtained through hydrothermal reaction. The preparation process of the material is simple, the cost is low, and no pollution is caused. The composite electrode material can increase the contact area between an electrolyte solution and an electrode material, shorten the ion transmission path, accelerate the ion transmission rate and increase the conductivity.As the electrode material of a supercapacitor, the material has excellent specific capacitance and cycle stability.

The invention belongs to the technical field of preparation of a supercapacitor material, and relates to a preparation method of an argentum (Ag) / cobaltous sulfide (CoS) nanometer sheet supercapacitor electrode material. CoS nanometer sheets are weighed and are dissolved in distilled water, ultrasonic dispersing is performed, then AgNO3 is added, after the AgNO3 is completely dissolved through magnetic stirring, a dispersion liquid is exposed under irradiation of a tungsten lamp, in situ load Ag nanometer particles on the surface of the CoS nanometer sheets are prepared by use of a photochemical reduction method, uninterrupted stirring is performed, an obtained product is washed by use of the distilled water and dehydrated alcohol, and an Ag / CoS composite nanometer material is obtained through centrifugation and drying. The Ag / CoS composite nanometer material, acetylene black and a polyvinylidene fluoride solution are stirred and mixed, a mixed liquid is taken and uniformly dropped into foamed nickel, pressing is performed after drying, an experiment capacitor is assembled, and by use of an electrochemical work station, a cyclic volt-ampere and constant-current charge and discharge test is carried out.

The invention particularly relates to a preparation method of a carbon cloth in-situ growth hollow three-dimensional Co9S8 / NiCoMo oxyhydroxide core-shell electrode material. Hollow Co9S8 nanotubes arebeneficial to electrolyte permeation, cobalt sulfide has high conductivity, so that the structural stability of the material is improved. Epitaxially grown NiCoMo oxyhydroxide nanosheets have high specific capacitance, a formed hollow three-dimensional network structure provides channels and more active sites for electron and ion transmission and permeation, so that the electrochemical performance is improved. An electrochemical performance test result shows that the specific capacity of a single electrode reaches 6.2 F.cm<-2> when the current density is 3mA cm<-1>.