52results about How to "Higher quality than capacitance" patented technology

The invention relates to a preparation method of carbon foam with high electrochemical performances, comprising the following steps of: firstly, weighing phenol formaldehyde, vanadate, surface active agent, sodium hydroxide and solvent according to mass ratio of 1:(0.6-4):(0.01-0.5):(1-20):(0.01-0.5):100, mixing uniformly and obtaining precursor solution of the carbon foam; putting the obtained solution into an environment with the temperature of 15 DEG C-60 DEG C to lead the solvent to be completely volatilized, and obtaining precursor of solid carbon foam; and solidifying the precursor of the solid carbon foam for 1 hour-24 hours at the temperature of 100 DEG C-200 DEG C, then rising the temperature to be 600 DEG C-1400 DEG C at the temperature rising speed of 1 DEG C/min-60 DEG C/min under the inert atmosphere, carbonizing for 0.5 hour-10 hours, and obtaining the carbon foam with high electrochemical performances. In the preparation method, the technology is simple, the quality is stable, vanadate introduced when the precursor solution of the carbon foam is prepared is converted into sodium vanadate nanocrystalline with a stable layer structure in the process of carbonization, and the obtained sodium vanadate nanocrystalline is embedded into a carbon foam skeleton uniformly. Compared with the existing carbon foam, the prepared carbon foam has the electrochemical performances such as high mass specific capacitance, good charging and discharging circulation and the like, and can be effectively applied in the fields such as electrode materials of electrochemical capacitors and the like.

The invention relates to a preparation method for an integral polyacrylonitrile carbon fiber electrode for desalination, belonging to the technical field of novel carbon material preparation and water treatment. The method is based on an electrostatic spinning technique. Polyacrylonitrile is electro-spun into a film and then preoxidation, carbonization and activation are conducted. The prepared carbon fiber material has the characteristics of good macro integrity, small fiber diameter, large mass specific capacitance, high desalination capacity and the like. When electro-adsorption treatment is conducted to NaCl solution with initial concentration being 70mg/l under 1.6V direct-current voltage, the adsorption capacity of the carbon fiber electrode reaches 4.64mgNaCl/g and therefore a strong desalination capacity is reflected. The novel carbon fiber electrode can be widely used in fields such as bitter saline water and seawater desalination, water softening, heavy metal ion removal andthe like.

The invention discloses a metal phthalocyanine-MXene composite material as well as a preparation method and application thereof. The method for preparing the metal phthalocyanine-MXene composite material comprises the following steps of: (1) mixing metal phthalocyanine with a first solvent to obtain a metal phthalocyanine solution, and adding the metal phthalocyanine solution into water to obtaina metal phthalocyanine nano structure; and (2) mixing the metal phthalocyanine nano structure, an MXene material and a second solvent to obtain the metal phthalocyanine-MXene composite material. The method is simple in technological process and good in repeatability; the adopted materials are easy to synthesize and low in price; large-scale preparation is easy; and commercialization of the materials and devices is facilitated. With the method adopted, the metal phthalocyanine nano structure can be introduced between MXene layers to serve as an interlayer spacer, therefore, the restacking effect of the MXene is effectively prevented, electrochemical active sites on the surface of the MXene are increased, the ion mobility in an electrochemical oxidation reduction process is remarkably enhanced, and then the electrochemical response to charge storage can be improved.

The invention belonging to the fields of electronic materials and devices discloses a composite electrode comprising a substrate. A carbon layer is electroplated on the surface of the substrate; and atransition metal oxide layer is electroplated on the surface of the carbon layer. The composite electrode has a three-dimensional porous fold structure; and the maximum mass specific capacitance of the composite electrode can reach up to 1783F.g-1. The preparation method of the composite electrode comprises: step one, preparing a substrate; step two, preparing a solution; step three, electroplating a carbon layer; step four, electroplating a transition metal oxide layer; and step five, carrying out cleaning and drying. Meanwhile, an application of the composite electrode in a super capacitoris also provided. The composite electrode has the high conductivity and high mass specific capacitance and cycle stability; and the maximum mass specific capacitance of the composite electrode can reach up to 1783F.g-1; the electrode can work circularly for 2000 times under the current density of 6A.g-1; and the specific capacitance can be kept to be 84.4% of the initial value. The composite electrode has the broad application prospects.

The invention provides a preparation method for a graphene membrane electrode material of a supercapacitor. The preparation method comprises the following steps: thoroughly soaking a graphene oxide membrane or reduced graphene oxide membrane in a polytetrafluoroethylene reaction vessel filled with concentrated sulfuric acid; carrying out a reaction at 120 to 180 DEG C for 3 to 24 h; and then carrying out cooling at room temperature, washing with distilled water and drying so as to prepare the graphene membrane electrode material. A supercapacitor assembled from the graphene membrane electrode material has good capacitive performance, especially superior cycle stability. The preparation method provided by the invention is convenient to operate. The prepared graphene membrane electrode material is applicable as an electrode material to symmetric or asymmetric supercapacitors.

The invention relates to an MXene/ZnMnNi LDH Van der Waals heterostructure, a preparation method and application thereof. The preparation method comprises: 1, preparing a single-layer ZnMnNi LDH nanosheet (F-ZnMnNi LDH); 2, preparing a single-layer MXene nanosheet (F-MXene); and 3, alternately stacking the F-ZnMnNi LDH and the F-MXene to form the F-MXene/F-ZnMnNi LDH Van der Waals heterostructure.The application comprises an electrode prepared by using the F-MXene/F-ZnMnNi LDH Van der Waals heterostructure, and a super capacitor prepared from the electrode. The F-MXene/F-ZnMnNi LDH Van der Waals heterostructure shows excellent electrochemical performance, the actual specific capacitance and the cycling stability of an electrode material are improved, and the F-MXene/F-ZnMnNi LDH Van der Waals heterostructure has good application in the field of supercapacitors.

The invention belongs to the field of electrode material preparation, and particularly relates to a preparation method of a high-performance cabbage-shaped heterostructure electrode material. The method comprises the following steps of pretreating foamed nickel, dissolving 2-3 mmol of nickel acetate, 4-5 mmol of cobalt acetate, 2-3 mmol of sodium molybdate, 30-40 mmol of ammonium fluoride and 2-5 g of urea into 60-100 ml of water, stirring, reacting, cooling, cleaning and drying to obtain a prepared sample, dissolving 8-9 mmol of sodium sulfide in 60-70 ml of deionized water, magnetically stirring for 45 minutes, transferring the prepared sample into the solution, transferring into a reaction kettle, keeping the temperature at 80-90 DEG C for 12 hours, naturally cooling to room temperature, cleaning for three times by using absolute ethyl alcohol and deionized water, keeping the temperature of the prepared sample at 60 DEG C for 6 hours, and drying to obtain a finished product. The problems that the material morphology is not uniform, the synthesis method cannot be accurately controlled, the conductivity is poor, and the adhesion with a current collector is poor are solved.

The invention discloses a preparation method of a highly flexible composite electrode, comprising the following steps: weighing and taking dimethylimidazole and pyrrole monomer in turn and dissolvingdimethylimidazole and pyrrole monomer in the water/methanol mixed solution to obtain a solution A; weighing and taking zinc nitrate hexahydrate and anhydrous ferric trichloride in turn, dissolving zinc nitrate hexahydrate and anhydrous ferric trichloride in the water/methanol mixed solution, and stirring the substances evenly to obtain a solution B; soaking filter paper in the solution A for 1-4h;taking the filter paper out and sucking the surface filtrate; putting the filter paper in the solution B for 20s and taking the filter paper out, and putting the filter paper in the solution A for 20s; repeating the previous step 10 times; soaking and washing the filter paper in de-ionized water to remove the surface residual; and drying the filter paper to a constant weight to obtain a highly flexible filter paper/ZIF-8/polypyrrole functional composite material. The composite material obtained has excellent flexibility and high mass specific capacitance, and can be directly used as a workingelectrode without any binder. The size and thickness of the electrode material are controllable. The preparation process is simple, feasible, green and economical.

The invention discloses a preparation method of a NiO@CoMoO4/NF capacitor electrode. The NiO@CoMoO4/NF capacitor electrode is prepared by taking NF, COCl2.6H2O, Na2MOO4.2H2O, glucose and a tough material as raw materials through the steps of preparation of NiO@CoMoO4/NF, loading of NiO@CoMoO4/NF carbon quantum dots, coating of the NiO@CoMoO4/NF tough material loaded with the carbon quantum dots and the like. The NiO@CoMoO4/NF has a higher specific capacitance value, meanwhile, the conductivity of the electrode can be greatly improved, on the other hand, the NiO@CoMoO4/NF electrode is treated by a ductile material, so that the NiO@CoMoO4/NF electrode can adapt to volume change in the charging and discharging process, meanwhile, the corrosion effect of an electrolyte can be prevented, finally, the product is good in cycling stability, and after 10000 times of charging and discharging cycles, the capacity is not attenuated, 100% of the maximum capacity is still kept, the mass specific capacitance is greatly increased, the mass specific capacitance of the electrode at 1 A/g can reach 1457 F/g, the electrochemical energy storage is excellent, and the electrode is worthy of market popularization.

The invention relates to a polyarylether/hydrophilic resin composite diaphragm for a supercapacitor and a preparation method of the diaphragm, which belongs to the technical field of the super-capacitor. The preparation method is characterized by comprising the steps: blending a brooethyl polyarylether solution with a hydrophilic resin solution, casting the mixed solution on a clean and tidy glass plate, and drying the glass plate in a vacuum drying box so as to form a membrane on the glass plate; and ammoniumizing and alkalizing the obtained brooethyl polyarylether/hydrophilic resin composite membrane, and cleaning the residual alkaline liquid in the membrane by utilizing deionized water to obtain the polyarylether/hydrophilic resin composite diaphragm. The supercapacitor manufactured by adopting the polyarylether/hydrophilic resin composite diaphragm prepared through the method is high in electrolyte adsorption volume, low in contact resistance, high in ion conductivity and high in mass specific capacity; moreover, the large weight and large size of the single supercapaictor caused by vast electrolyte can be avoided, the safety of the supercapacitor is improved, an assembling space can be reduced, and the potential application value is high in the fields such as electronic devices and hybrid electric vehicle.

The invention discloses an edible supercapacitor and a preparation method and an application thereof. A metal clamp is adopted as an electrode substrate; and an active material layer, a diaphragm and an electrolyte of the capacitor are all made from food, and can be directly ate and digested easily by a human or an animal before or after charging. The food adopted by the supercapacitor is wide in resource; the maximum output voltage of the prepared supercapacitor can be 2.000V while the maximum mass specific capacitance can be 2.693 mF/g; and the supercapacitor has the characteristics of high charging speed, high safety, environment friendliness, and no pollution. When the edible supercapacitor is ate, the current released by the capacitor can provide electric stimulation for taste bud of a patient with dysgeusia so as to generate gestation; based on the electricity storage characteristic, the supercapacitor can supply power for a medical micro robot so as to prolong the power supply time; and the discharge current also can be utilized to kill bacteria in a human body, and the like, so that the edible supercapacitor has wide application prospect.

The invention discloses a preparation method of a modified graphite electrode material and an application thereof. The process comprises the steps of oxidizing graphite to acquire a graphite oxide, then enabling the graphite oxide to be mixed with ammonia water and performing heating processing, subsequently performing high-temperature processing under the protection of nitrogen to acquire an activated product, then performing modification, putting the modified graphite oxide into a reactor, adding a mixed solvent of deionized water and absolute ethyl alcohol, polyvinylpyrrolidone and tetrapropyl orthosilicate, performing high-temperature processing to acquire an intermediate compound, carrying out solidification processing, ball-milling processing and carbonization processing on the intermediate compound, finally adding sodium dodecylbenzene sulfonate, magnet powder, nickel hydroxide, a conductive agent and a binding agent, and preparing an electrode piece through the steps of stirring, coating, drying, rolling and the like. The prepared modified graphite electrode material is large in specific surface area, high in mass specific capacitance and high in power density, and has good application prospects. Meanwhile, the invention further discloses an application of the modified graphite electrode material prepared according to the process in preparation of a supercapacitor.

The invention discloses a preparation method of a fiber/graphene/carbon quantum dot/cobalt nickel sulfide flexible electrode material, which comprises the following steps: A, soaking a pretreated fiber fabric in a suspension containing graphene oxide, drying, and repeating the step for multiple times to obtain a fiber/graphene oxide material; and B, immersing the material obtained in the step A into a hydrothermal reaction kettle containing carbon quantum dots, and carrying out heating reaction synthesis to obtain the fiber/graphene/carbon quantum dot flexible electrode material. And C, immersing the material obtained in the step B into a hydrothermal reaction kettle containing nickel salt, cobalt salt and a sulfur-containing precursor solution, and carrying out heating reaction synthesisto obtain the fiber/graphene/carbon quantum dot/cobalt nickel sulfide flexible electrode material. The material prepared by the method disclosed by the invention has relatively high area specific capacitance and power characteristics, and is excellent in cycle performance.

The invention belongs to the field of electrode material preparation, and mainly relates to a preparation method of a high-performance supercapacitor heterostructure electrode material. The method comprises the following steps: pretreating foamed nickel, dissolving 1 mmol of nickel nitrate, 2 mmol of cobalt nitrate, 8-10 mmol of ammonium fluoride and 1-2 g of urea into 55 ml of water, and carrying out heat preservation at 120 DEG C for 6 hours; dissolving 1 mmol of cobalt nitrate, 8 to 10 mmol of ammonium fluoride and 0.5 to 1 g of urea into 50 ml of water; transferring the solution into a reaction kettle, and keeping the temperature at 110 DEG C for 6 hours; dissolving 0.35 g of sodium sulfide in 55 ml of deionized water, magnetically stirring for 20 min, preserving heat at 120 DEG C for 6 h, naturally cooling to room temperature, preserving heat of the prepared sample at 60 DEG C for 12 h, and drying to obtain the prepared electrode material. The problems that the structure of the material is unstable, the size is uniform, the synthesis method cannot be accurately controlled, the conductivity is poor, and the contact property with a current collector is poor are solved.

The invention discloses a preparation method of a fiber/graphene/carbon quantum dots/FeOF flexible electrode material, which comprises the following steps: A, impregnating pretreated fiber fabric in asuspension containing graphene oxide and drying the fiber fabric, and repeating the step several times to obtain a fiber/graphene oxide material; B, immersing the material obtained in step A in a hydrothermal reaction vessel containing carbon quantum dots, and synthesizing a fiber/graphene/carbon quantum dots flexible electrode material by heating reaction; and C, immersing the material obtainedin step B in a hydrothermal reaction vessel containing FeF3.3H2O and alcohol solution, and synthesizing a fiber/graphene/carbon quantum dots/FeOF flexible electrode material by heating reaction. The material prepared by the method of the invention has higher area specific capacitance and power characteristics and superior cycle performance.

The invention discloses a preparation method of a Bi2Fe4O9 material and an application thereof, and the method comprises the following steps: (1) adding bismuth salt, ferric salt and a surfactant into acid for dissolving, and titrating with an alkaline solution to obtain a precursor suspension; (2) carrying out a hydrothermal reaction on the precursor suspension; and (3) centrifuging, washing and drying the solution obtained by the reaction in the step (2) to obtain the Bi2Fe4O9 material. The Bi2Fe4O9 material obtained by the method is applied to a supercapacitor electrode and shows relatively high mass specific capacitance and relatively good electrochemical performance; by controlling the concentration of sodium hydroxide and the use amount of polyvinylpyrrolidone, a flower-shaped and strip-shaped Bi2Fe4O9 interlaced and nested structure can be obtained, and the special structure and more gaps provide a convenient conductive channel for charge transfer, so that the Bi2Fe4O9 material has the advantages of high specific capacity, stable charge and discharge and the like.

The invention belongs to the field of electrode material preparation, and mainly relates to a preparation method of a high-performance supercapacitor heterostructure electrode material. The method comprises the following steps: pretreating foamed nickel, and dissolving nickel nitrate, cobalt nitrate, ammonium fluoride and urea into water to prepare a precursor; dissolving cobalt nitrate, sodium molybdate, ammonium fluoride and urea into 50ml of water; and transferring the solution and the precursor into a reaction kettle to obtain the prepared electrode material. The problems that the structure of the material is unstable, the size is uniform, the synthesis method cannot be accurately controlled, the conductivity is poor, and the contact property with a current collector is poor are solved.

The present invention discloses a supercapacitor capable of eating and a preparation method thereof. The supercapacitor comprises an electrode active layer, a diaphragm and electrolyte which are all edible, the supercapacitor employs a metal clamp as an electrode conductive substrate, and the assembling is performed according to the sequence from the metal clamp, the electrode active layer, the diaphragm, the electrode active layer and the metal clamp. The active materials employ spicy sauce or flour. The metal clamp is taken as the electrode substrate, the active materials, the diaphragm and the electrolyte of the capacitor are formed by food, the source of the food materials is wide, the cost is low, and the prepared capacitor has high safety and is environmentally friendly and pollution-free.

The invention discloses a polymer electrolyte containing zwitter-ionic groups and redox groups. The structural general formula of the polymer electrolyte is shown in the specification. The polymer electrolyte disclosed by the invention has excellent electrochemical performance; the preparation method of the polymer electrolyte is simple and suitable for industrial production.

The invention discloses a fabrication method of a supercapacitor electrode, and belongs to the field of an electronic material and a device. The fabrication process comprises the steps of preparing a substrate; adding a manganese salt, sodium dodecyl sulfate or a sodium dodecyl benzene sulfonate solution in a transition metal salt solution, coating the mixture on the substrate, and naturally drying the substrate; placing the substrate in an inner flame of an alcohol lamp flame, and heating the substrate for 2 minutes; and performing annealing for 60-300 minutes at 400 DEG C. In the fabrication process, a three-dimensional micro-nano porous nanocarbon-manganese oxide composite material will be formed from a precursor solution coated on the substrate during flame synthesis and has excellent conductivity and electrochemical activity; when the composite material is applied to an active material of the supercapacitor electrode, the mass-to-capacitance range can reach 10.99-322.60F/g; and moreover, the method for fabricating the supercapacitor electrode is simple and is low in cost, and thus, the method has a wide market application prospect.