31results about How to "Higher area than capacitance" patented technology

The invention discloses a simple, easy-to-operate and environmentally friendly method for synthesizing a three-dimensional structure Co-MOF/NF material in situ. With a cobalt nitrate hexahydrate adopted as a cobalt source, terephthalic acid as an organic ligand, N,N-dimethylformamide as a solvent, absolute ethyl alcohol as an additive, and foamed nickel as a substrate, a one-step solvothermal method is adopted to obtain Co-MOF/NF; when being used as supercapacitor self-supporting electrode material, the Co-MOF/NF exhibits ultra-high area ratio capacitance (13.6 F cm<-2>), the performance of the Co-MOF/NF is far superior to the performance of previously reported MOF-based materials. With the method of the invention adopted, problems such as large contact resistance, insufficient applicationof active materials, and complex electrode preparation processes which are caused by the application of powder electrode materials can be solved. The Co-MOF/NF material is a novel energy storage material which has the advantages of ultra-high area specific capacitance, excellent rate performance and low cost.

The invention belongs to the field of supercapacitor production and specifically discloses a method for producing an all-hydrogel stretchable supercapacitor and the capacitor. The stretchable supercapacitor is assembled in a traditional sandwich structure by taking sodium alginate/polyacrylamide/carbon nanotube/poly(3,4-ethylendioxythiophene)-polystyrolsulfon acid composite hydrogel with high stretchability as an electrode material and sodium alginate/polyacrylamide/sodium sulfate/redox couple composite hydrogel with high stretchability as electrolyte. Each of the electrode material and electrolyte provided in the method is based on a stretchable hydrogel material, and strong adhesion exists between the electrode material and the electrolyte, so that the constraint that an existing assembling technology needs the help of a stretchable base can be avoided. The all-hydrogel stretchable supercapacitor is suitable for a traditional application field of the supercapacitor and high-end application fields such as wearable electronic equipment, stretchable electronic equipment, electronic skins and portable integrated devices.

The invention discloses a preparation method of a three-dimensional layered structure Mn-doped CoP nanowire modified nanosheet array material (Mn-CoP NS@NW/NF) which is grown in situ on nickel foam. With cobalt-nitrate hexahydrate adopted as a cobalt source, manganese sulfate monohydrate adopted as a manganese source, ammonium fluoride and urea used to control the shape of the material, foamed nickel used as a substrate, a Mn-Co precursor can be prepared by using a hydrothermal method; and a low temperature preservation type phosphorization is carried out, so that the Mn-CoP NS@NW/NF can be synthesized. When being applied to a supercapacitor self-supporting electrode material, the Mn-CoP NS@NW/NF exhibits extremely high area specific capacitance (8.66 F cm<-2>) in 6 M KOH electrolyte, suchkind of performance of the Mn-CoP NS@NW/NF is much higher than that of an undoped CoP nanowire array material. On the basis of full utilization of the high specific surface area of a nano-array layered structure and the synergistic effects of various metals, the novel energy storage material has the advantages of high area ratio capacitance, long cycle life and low cost.

The invention provides a preparation method of a cobalt hydroxide/rGO/nickel hydroxide sandwich-like flexible electrode material. The preparation method is characterized by comprising the following steps that S1, firstly, a carbon fiber cloth is subjected to ultrasonic cleaning sequentially through acetone, deionized water and ethanol and then dried; S2, the carbon fiber cloth dried in the step S1serves as a base, nickel hydroxide is deposited through a hydrothermal reaction method, and drying treatment is conducted; S3, the obtained carbon fiber cloth with the deposited nickel hydroxide in the step S2 serves as a base, rGO is deposited through an electrodeposition method, and drying treatment is conducted; and S4, the obtained carbon fiber cloth with the deposited rGO/nickel hydroxide inthe step S3 serves as a base, cobalt hydroxide is deposited through a hydrothermal reaction method, drying treatment is conducted, and the cobalt hydroxide/rGO/nickel hydroxide sandwich-like flexibleelectrode material is obtained. The sandwich-like flexible electrode material prepared through the method has excellent rate performance, in addition, the process is simple, the cost is low, and industrial popularization is easy.

The invention relates to carbon/graphene composite super-capacitor electrode materials and a preparation method thereof. By filling holes of natural wood with graphene oxide and carrying out high-temperature carbonization, the electrode materials are prepared. The electrode materials comprise penetrating big hole structures which are perpendicular to the plane direction of the electrodes and are formed by carbonizing the wood, and small hole structures formed by graphene. The carbon/graphene composite electrode materials can be independently used without adhesives and conductive agent. The thickness is adjustable, application of non-active materials in a super capacitor assembly process is effectively reduced and a super capacitor with high area specific capacitance and long circulation service lifetime is obtained.

The invention discloses a foamed nickel/MXene-Co3O4 composite electrode and a preparation method thereof. The preparation method comprises the following steps of: (1) pretreatment of foamed nickel, namely, taking the foamed nickel, carrying out ultrasonic cleaning with sulfuric acid, ethanol and deionized water in sequence, and performing drying at a constant temperature; and (2) preparation of a composite electrode, namely, mixing MXene and Co3O4 to prepare mixed powder, coating the surface of the foamed nickel with the mixed powder, and performing vacuum plasma sintering to prepare the composite electrode. The foam material composite electrode is prepared through the foamed nickel, the MXene and the Co3O4, the MXene-Co3O4 mixed powder is stably combined through the foamed nickel under the high-temperature and high-pressure effects of a vacuum plasma sintering furnace, use of an adhesive is avoided, the preparation cost is reduced, and the preparation time is only 40-60 min; the organ-shaped structure of MXene can effectively accommodate and disperse a catalyst, the problem that the catalyst is easy to agglomerate is overcome, the activity and stability of the catalyst are improved, and the prepared electrode is large in specific surface area, and good in conductivity, and an electrode material with excellent performance can be formed.

The invention discloses a preparation method of a highly regularly arranged Mn-doped Ni-MOF ultrathin nanosheet array supercapacitor electrode material (Mn0. 1-Ni-MOF/NF). Nickel nitrate hexahydrate is used as a nickel source, manganese chloride tetrahydrate is used as a manganese source, ammonium fluoride is used as a fluorine source and regulates the pH value of a precursor solution together with urea, foamed nickel is used as a conductive substrate, a MnNi-LDH/NF precursor is prepared by adopting a hydrothermal method, MnNi-LDH/NF is treated by adopting a solvothermal method to prepare Mn0.1-Ni-MOF/NF wihch is used for the supercapacitor self-support electrode material, and in a 6M KOH electrolyte, the current density is 2mA cm<2>, and extremely high area specific capacitance (16.2 F cm<2>) is shown, and the performance is far higher than that of an undoped NiMOF nanosheet array material. The novel energy storage material with high area specific capacitance, long cycle life and lowcost is constructed by fully utilizing the high specific surface area of the nano array structure and the synergistic effect among various metals.

The invention relates to a high-flexibility graphene-based supercapacitor based on laser processing and a preparation method thereof, and belongs to the technical field of capacitors. The preparation method comprises the following steps: (1) employing a Hummers method to prepare a graphene oxide solution; (2) preparing a fiber solution, fully stirring and mixing the graphene oxide solution prepared in the step (1) and the fiber solution according to a certain mass ratio to prepare a graphene oxide/fiber dispersion liquid, and performing vacuum filtration to prepare a composite material membrane; and (3) processing the composite material membrane obtained in the step (2) into a proper electrode shape through laser to obtain the high-toughness graphene-based supercapacitor based on laser processing. According to the invention, the preparation method is simple in preparation process; the composite material electrode obtained through laser processing is loose and porous, good in water absorption, good in flexibility, excellent in tensile property and high in specific capacitance; as a composite material, compared with a traditional supercapacitor made of a single electrode material, the supercapacitor is higher in energy storage and more stable in circulation; and water is used as electrolyte, so that safety and environment protection are achieved.

The invention belongs to the technical field of new energy, and particularly relates to a vanadium oxide electrode material with a nanorod-shaped structure, and a preparation method and application thereof. The method comprises the following steps: firstly, performing activating treatment on carbon cloth in a three-electrode system by adopting a cyclic voltammetry method, then performing electrodeposition on vanadium oxide, and drying to obtain the vanadium oxide with the nanorod-shaped structure. The specific capacity of the carbon cloth is improved through a surface activation method, the number of oxygen-containing functional groups on the surface of the carbon cloth is increased, then a layer of vanadium oxide is plated on the surface of the carbon cloth through an electro-deposition method, and further the pseudocapacitance of the electrode material is improved. The method is easy to operate and short in preparation time, the vanadium oxide sediment which is of a nanorod structure and is evenly distributed is obtained on the treated carbon cloth, and the area specific capacitance is high.

The invention relates to an energy storage system with a modified carbon-based electrode cooperating with a redox electrolyte. The energy storage system comprises the steps of 1 preparing an electrode, wherein a carbon-based material prepared through an electrochemical activation method in acid liquor serves as the electrode; and 2 constructing an energy storage system: carrying out electrochemical oxidation on the electrode prepared in the step 1 in an aqueous electrolyte. The activation method adopted by the invention is simple in process, low in cost, safe and environment-friendly, and theraw materials can be recycled. In the constructed energy storage system, the carbon-based electrode can show ultrahigh area specific capacitance, and has good rate capability and cycle life. The constructed energy storage system is safe and pollution-free, has the advantage of higher cost, and is beneficial to commercial application.

The invention discloses a preparation method of a high-performance flexible silk fabric electrode material and a product thereof. The preparation method sequentially comprises the following steps: (1)adding a silk fabric into a solvent containing a ternary solution (CaCl2/H2O/C2H5OH with the molar ratio of 1: 8: 2), temporarily and slightly dissolving the fabric for a period of time under the conditions of heating and water bath oscillation, washing with water and drying; (2) adding the fabric obtained in the step (1) into a sulfuric acid and aniline monomer mixed solution, and stirring for aperiod of time; (3) adding a mixed solution of sulfuric acid and ammonium persulfate into the step (2), and stirring to react for a period of time; and (4) washing and drying the reacted fabric to obtain the flexible fabric electrode material. The raw material cost is low, the preparation method is rapid, simple, convenient and effective, industrial production is easy, and the prepared fabric electrode has both flexibility and high area specific capacitance and has very good potential application value in the fields of flexible supercapacitors and wearable devices.