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

The invention provides a method for preparing a cobalt hydroxide / rGO / nickel hydroxide sandwich-shaped flexible electrode material, which is characterized in that it comprises the following steps: S1: First, the carbon fiber cloth is cleaned by acetone, deionized water and ethanol in sequence, Then carry out drying treatment; S2: use the carbon fiber cloth after drying treatment in step S1 as the base, deposit nickel hydroxide by hydrothermal reaction method, and perform drying treatment; S3: use the carbon fiber cloth deposited with nickel hydroxide obtained in step S2 as the base , deposit rGO by electrodeposition method, and perform drying treatment; S4: use the carbon fiber cloth deposited with rGO / nickel hydroxide obtained in step S3 as the substrate, deposit cobalt hydroxide by hydrothermal reaction method, and perform drying treatment to obtain hydrogen Cobalt oxide / rGO / nickel hydroxide sandwich-like flexible electrode material. The sandwich-shaped flexible electrode material prepared by the method provided by the invention has excellent rate performance, simple process, low cost, and easy industrial promotion.

The invention discloses a method for increasing binding force between an anodic titanium oxide nanometer tube array film and a titanium substrate. According to the method, the titanium oxide nanometertube array film is prepared by adopting a general constant-current or constant-voltage anodic oxidation method; subsequently small-current or small-voltage short-time constant-current or constant-voltage anodic oxidation treatment is carried out in the same electrolyte; finally annealing treatment is carried out; and thus the binding force between the titanium oxide nanometer tube array film andthe titanium substrate can be remarkably increased and can preferably meet the requirements of practical application. The method disclosed by the invention is simple and convenient to operate; the electrolyte needs not to be replaced; internal stress caused by over-large volume expansion and relatively poor plasticity of the metallic titanium in a growth process of an oxidation film can be effectively released; the binding force between the oxidation film and the titanium substrate is remarkably increased; and the method is also applicable to flexible thin titanium sheets.

A method for prepare a core-shell heterostructure self-supporting electrode material, and relates to the field of supercapacitors. The method including a P-Ni(OH)2 micro / nanorod and Ni-Co LDH nanosheets, the Ni-Co LDH nanosheets uniformly wrap in the outer surface of the P-Ni(OH)2 micro / nanorod. The preparation method comprises the following steps: using foam nickel as nickel source and substrate,using H2O2 solution containing NaH2PO4 as oxidant, successfully preparing a P-Ni(OH)2 micro / nanorod array growing in situ; Secondly, P-Ni(OH)2 rod is used as secondary substrate, and Ni-Co LDH nanosheets grow on the rod by a by hydrothermal method, and a three-dimensional composite of a three-dimensional porous P-Ni(OH)2@Ni-Co LDH core-shell heterostructure is prepared. The prepared self-supporting electrode is of a three-dimensional porous core-shell heterostructure and has the advantages of excellent electrochemical performance, abundant resources, simple process and low production cost, and the problem of low specific capacity of supercapacitors is solved.

The invention relates to a preparation method of a negative electrode material of a high-specific-capacitance flexible super-capacitor. The preparation method comprises the following steps: (1) preparing molybdenum-doped tungsten oxide nanoparticles through a hydrothermal method; dispersing the molybdenum-doped tungsten oxide nanoparticles and carbon nanotubes CNTs into water; carrying out ultrasonic treatment to obtain a uniform dispersed solution; (2) performing suction filtration on the dispersed solution, and washing and drying to obtain the negative electrode material of the high-specific-capacitance flexible super-capacitor. The preparation method provided by the invention is simple, short in time and low in cost; the prepared electrode material has relatively high flexibility and electrochemical activities; under relatively high current density, the area specific capacitance can reach 1.1F.cm<-2>; the electrode material has great application prospect in the field of the super-capacitors.

The invention discloses a nickel foam / MXene‑Co 3 o 4 The composite electrode and its preparation method comprise the following steps: (1) pretreatment of foamed nickel: take foamed nickel, ultrasonically clean it with sulfuric acid, ethanol, and deionized water in sequence, and dry at constant temperature; (2) preparation of composite electrode: take MXene, co 3 o 4 Mix to prepare mixed powder, smear on the surface of nickel foam, and vacuum plasma sinter to prepare a composite electrode. The present invention adopts nickel foam, MXene and Co 3 o 4 The foam material composite electrode is prepared, and the MXene‑Co 3 o 4 The mixed powder is stably combined, avoiding the use of binders, reducing the preparation cost, and the preparation time is only 40-60 minutes; the organ-shaped structure of MXene can effectively accommodate and disperse the catalyst, which overcomes the problem of easy agglomeration of the catalyst and improves the production efficiency of the catalyst. The activity and stability of the catalyst, the prepared electrode has a large specific surface area and good electrical conductivity, and can form an electrode material with excellent performance.

The invention provides a lignin-based supercapacitor material with high area specific capacitance, a preparation method and an application thereof. The supercapacitor material in the present invention is a composite material in which lignin-based porous graphene is combined on a substrate; and two preparation methods are provided. Method 1: The lignin is removed from the ash and then dissolved, and the obtained impregnating solution is impregnated with the substrate, dried and then subjected to laser direct writing, and the obtained lignin-based porous graphene-substrate composite material removes excess lignin. Method 2: Apply the ball-milled lignin on the substrate, melt and combine it on the substrate; then perform laser direct writing, and remove excess lignin from the obtained lignin-based porous graphene-substrate composite. Both methods can obtain the lignin-based supercapacitor material with high area specific capacitance described in the present invention. The supercapacitor material of the present invention uses flexible carbon cloth as a base material, has excellent flexibility, can be bent at any angle, and has ultrahigh area specific capacitance.

The invention relates to the field of energy storage devices, in particular to a super capacitor based on an anti-freezing hydrogel electrolyte and a preparation method thereof. The super capacitor comprises an anti-freezing hydrogel electrolyte and an electrode material tightly attached to the two sides of the anti-freezing hydrogel electrolyte. The electrode material comprises carbon nanotube paper and a conductive polymer. The anti-freezing hydrogel comprises water, nanofibers, a cross-linked polymer and a lithium salt. The super capacitor adopts anti-freezing hydrogel of a pure water system as an electrolyte and needs no diaphragm, the ionic conductivity of the used anti-freezing hydrogel reaches 0.023S / cm, and the anti-freezing hydrogel has good anti-freezing performance and mechanical performance, so that the capacitor obtained has high specific capacitance, excellent bending resistance and charge-discharge cycle stability, the specific capacitance of the capacitor at 25 DEG C reaches 32.7-110.2 mF / cm<2>, the specific capacitance at -20 DEG C reaches 36.9 mF / cm<2>, and the specific capacitance of the capacitor exceeds that of a hydrogel-based solid super capacitor reported atpresent. The preparation method is simple in process, mild in condition and suitable for large-scale production.

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 three-dimensional electrode material, which is characterized in that it comprises: an array of Al nanonails formed on an aluminum foil; a nickel layer formed on the array of Al nanonails; a MnO layer formed on the nickel layer x Nanopin arrays. The preparation method includes: S101, growing an Al nanonail array on an aluminum foil by using an anodic oxidation process and an etching process; S102, growing a nickel layer on the Al nanonail array by using a magnetron sputtering process; S103, using a three-electrode electric The deposition process grows MnO on the nickel layer x Nanonail arrays to obtain three-dimensional electrode materials. The invention also discloses a solid supercapacitor, which comprises the electrode prepared from the above-mentioned three-dimensional electrode material. The electrode material is applied in a solid supercapacitor, which improves the area specific capacitance of the capacitor, and also improves the rate characteristic and cycle performance of the capacitor.

The invention discloses an electrode with a flexible self-supporting structure and a preparation method thereof, belonging to the technical field of electrochemical energy storage. A metal substrate is soaked in a graphene oxide solution and evaporated to form a layer of graphene oxide on the substrate. The thin film is then reduced with ascorbic acid to obtain the lower layer of reduced graphene oxide thin film; the mixed aqueous solution of transition metal salt, copper salt, and surfactant is spin-coated on the titanium sheet substrate, and synthesized in a flame to prepare The middle nano-carbon film is obtained; the upper reduced graphene oxide film is prepared by the same preparation method as the lower reduced graphene oxide film; the substrate is dried, and the prepared film is peeled off from the substrate to obtain a flexible, metal-free Substrate self-supporting structural electrodes. The electrode has a unique structure, simple preparation method and low cost, and has high area specific capacitance and excellent cycle stability when used as an electrode of a supercapacitor, and has broad application prospects.