33results about How to "Improve the utilization of specific surface area" patented technology

The invention relates to the field of material chemistry and provides a graphene / SiO2 composite material for solving various problems existing in the existing preparation method of a graphene material. The composite material is composed of two components graphene and SiO2. The composite material disclosed by the invention is good in dispersity; and meanwhile, specific surface area utilization rate of the graphene is improved. Meanwhile, the invention further discloses a preparation method and an application of the graphene / SiO2 composite material. A preparation process in the invention is simple and applied to reinforcement filler of organic silicon polymer.

The invention discloses a nickel hydroxide / graphene nano composite, a preparation method thereof, a supercapacitor electrode and a supercapacitor. The composite is formed by base material graphene and a nickel hydroxide nanosheet growing on the surface of the graphene in situ, and the composite integrally has a three-dimensional porous structure. A graphene-based composite is prepared by loading a transition metal hydroxide on the surface of the graphene with high specific surface area and excellent conductivity in a composition manner. Due to synergistic effect of all componenta of the composite, all components can mutually enhance advantages and avoid disadvantages; and meanwhile, long circle life, high power density and high stability of an electric double-layer capacitor and high specific capacitance characteristic of a pseudocapacitor are combined, thereby improving the comprehensive performances of the supercapacitor.

The invention discloses nitrogen-oxygen co-doped hollow carbon nanospheres, a preparation method thereof, a supercapacitor electrode and a supercapacitor. The preparation method of the nitrogen-oxygenco-doped hollow carbon nanospheres comprises the steps as follows: pyrrole and aniline are subjected to a polymerization reaction in a water liquor containing a soft template, and a hollow carbon nanosphere precursor is obtained; the hollow carbon nanosphere precursor is washed, pulverization treatment, carbonization treatment and ammonia water activation treatment are performed, and the nitrogen-oxygen co-doped hollow carbon nanospheres are obtained. The nitrogen-oxygen co-doped hollow carbon nanospheres prepared with the preparation method have larger specific surface area, good wettabilityand high specific surface area utilization rate. The supercapacitor electrode and the supercapacitor comprise the nitrogen-oxygen co-doped hollow carbon nanospheres prepared with the method.

The invention discloses an activated carbon material applied to a supercapacitor electrode material. The activated carbon material is prepared by pretreating a wood raw material, a seaweed raw material and a crop straw raw material, and performing mixing and carbonizing, wherein bamboo sawdust is selected as the wood raw material, sargassum is selected as the seaweed raw material, and cotton strawis selected as the crop straw raw material; and carbonizing the pretreated bamboo sawdust powder, cotton straw powder and sargassum powder in an oxygen atmosphere, performing chemical activation by using a potassium hydroxide solution and citric acid, mixing with ferric trichloride, grinding, and performing high-temperature calcination activation to obtain the activated carbon material. The activated carbon material has very high specific surface area and porosity, the specific surface area reaches 2563.1 m<2> / g, and when the material is applied to a supercapacitor, the mass specific capacitance reaches 299F / g under the current density of 1A / g. The activated carbon material is a low-cost green electrode material with excellent electrochemical performance.

The invention discloses a porous layered carbon nitride / graphene / nickel disulfide super capacitor material and a preparation method thereof. Porous layered g-C3N4 / graphene is compounded with a NiS2 pseudo-capacitive material to form the carbon nitride / graphene / nickel disulfide material with a heterostructure. The electrode material has the characteristics of high specific capacity and good stability.

The invention discloses a nitrogen oxygen co-doped porous carbon nano belt, a preparation method, a super capacitor electrode and a super capacitor. The preparation method comprises steps of carryingout a hydrothermal reaction on formaldehyde and hydroquinone in the acid solution so as to obtain a carbon nano belt precursor; and carrying out carbonizing treatment and ammonium hydroxide activatingtreatment on the carbon nano belt precursor so as to obtain a nitrogen oxygen co-doped porous carbon belt. According to the invention, the nano belt has quite big specific area, good wettability, andhigh specific area utilization rate. The super capacitor electrode and the super capacitor have the prepared nitrogen oxygen co-doped porous carbon nano belt.

The invention discloses a nickel hydroxide / graphene nano composite, a preparation method thereof, a supercapacitor electrode and a supercapacitor. The composite is formed by base material graphene and a nickel hydroxide nanosheet growing on the surface of the graphene in situ, and the composite integrally has a three-dimensional porous structure. A graphene-based composite is prepared by loading a transition metal hydroxide on the surface of the graphene with high specific surface area and excellent conductivity in a composition manner. Due to synergistic effect of all componenta of the composite, all components can mutually enhance advantages and avoid disadvantages; and meanwhile, long circle life, high power density and high stability of an electric double-layer capacitor and high specific capacitance characteristic of a pseudocapacitor are combined, thereby improving the comprehensive performances of the supercapacitor.

The invention discloses cap-shaped nanometer graphite as well as a preparation method and an application thereof, and belongs to the technical field of nanometer material preparation and electrochemistry energy storage. The preparation method comprises the following steps of: firstly preparing a template agent capable of generating nonuniform carbon deposition under chemical vapor deposition atmosphere, generating cap-shaped nanometer graphite on the prepared template agent, and finally removing and drying the template agent so as to prepare the cap-shaped nanometer graphite. The prepared cap-shaped nanometer graphite is in a cap-shaped structure, the diameter of the widest part of the cap-shaped nanometer graphite is 6-1000nm, and the height of the cap-shaped nanometer graphite is 1 / 5-1 / 2 of the diameter of the widest part of the cap-shaped nanometer graphite, and the specific surface area of the cap-shaped nanometer graphite is 80-2000m<2> / g. The cap-shaped nanometer graphite served as an electrode material is used for manufacturing a supercapacitor, wherein the mass percent of the cap-shaped nanometer graphite to the supercapacitor is 20-40%; the preparation method disclosed by the invention has the advantages of simple operation, low cost and environment protection; the utilization rate of the specific surface area and the energy density of the prepared cap-shaped nanometer graphite are high; and the effect is good when the prepared cap-shaped nanometer graphite serving as the electrode material is used for manufacturing the supercapacitor.

The invention discloses a micro / nano structured cathode material for lithium air batteries. The cathode material comprises hollow porous composite fibers, is obtained by compounding catalyst nano particles used for lithium air battery positive electrode reaction with a hollow micron-sized carbon fiber carrier, the carbon fiber tube wall comprises a plurality of nano pores which are interconnected, and the catalyst nano particles are dispersedly loaded on the carbon fiber tube wall and in the pores. The prepared cathode material can provide sufficient active substance reaction zones, simultaneously the porous structure of the tube wall increases the reaction activity of the active substance, and the hollow structure in the tube guarantees the unblocked delivery channel of oxygen. According to the invention, the cathode material disclosed herein has a structure of hollow in the tube and porous on the tube wall; the micro / nano structured cathode material formed by compounding the nano catalyst, thus the material has excellent electrical conductivity, can effectively raise the charge and discharge capacity of the lithium air batteries, reduce the polarization of charge and discharge, raise the high rate discharge capability and power density of the lithium air batteries are raised, the battery inner resistance is reduced, thus the material disclosed herein is an ideal cathode material.

The invention discloses a water system asymmetric supercapacitor based on porous carbon nitride / graphene / nickel disulfide and carbon nitride / graphene and a preparation method thereof. The positive electrode material is obtained in a way that a one-step calcination method is utilized to obtain a g-C3N4 / graphene as the substrate and NiS2 is further loaded to obtain porous layered structure carbon nitride / graphene / nickel disulfide, and the negative electrode material is three-dimensional porous structure carbon nitride / graphene prepared by a solvothermal method. The working voltage of the assembled water system asymmetric supercapacitor is 1.6 V. When the energy density is 56Wh kg-1, the power density reaches 800W kg-1, and there is almost no attenuation of the capacity after 10000 cycles. The high specific energy is realized and the supercapacitor has the characteristics of high specific power, low preparation cost, environmental protection and high practical application value.

The invention discloses nitrogen-oxygen co-doped hollow carbon nanospheres, a preparation method thereof, a supercapacitor electrode and a supercapacitor. The preparation method of the nitrogen-oxygenco-doped hollow carbon nanospheres comprises the steps as follows: pyrrole and aniline are subjected to a polymerization reaction in a water liquor containing a soft template, and a hollow carbon nanosphere precursor is obtained; the hollow carbon nanosphere precursor is washed, pulverization treatment, carbonization treatment and ammonia water activation treatment are performed, and the nitrogen-oxygen co-doped hollow carbon nanospheres are obtained. The nitrogen-oxygen co-doped hollow carbon nanospheres prepared with the preparation method have larger specific surface area, good wettabilityand high specific surface area utilization rate. The supercapacitor electrode and the supercapacitor comprise the nitrogen-oxygen co-doped hollow carbon nanospheres prepared with the method.

The invention discloses a 3D porous graphene / transition metal oxide composite material and its preparation method and application. The preparation method of the composite material: after ultrasonically dispersing graphite oxide into water, then adding transition metal salt and sodium bicarbonate and stirring dissolved to obtain a mixed solution; the mixed solution is transferred into a hydrothermal reaction kettle for hydrothermal reaction, and the hydrothermal reaction product is dried and calcined under a protective atmosphere to obtain a 3D porous structure, and the original transition metal oxide 3D porous graphene / transition metal oxide composite material grown on the surface of graphene, the composite material has good electrochemical properties, can be applied to supercapacitor electrode materials or lithium ion negative electrode materials, and its preparation method is simple and cheap , Environmentally friendly and meet industrial production standards.

The invention discloses an electrochemical capacitor and electro-adsorption desalination electrode material, which is formed by the combination of nano nickel oxide and nano carbon materials. The preparation method of the electrochemical capacitor and electro-adsorption desalination electrode material comprises the steps of: 1, preparing a nickel salt aqueous solution; 2, mixing the nickel salt aqueous solution with the nano carbon materials; 3, preparing nanocarbon / nickel oxide composite powder; 4, and preparing an electrode. The electrochemical capacitor and electro-adsorption desalination electrode material obtains large capacitance by utilizing oxidation-reduction property of the nano nickel oxide, is high in conductivity, high in specific surface area and high in utilization rate of specific surface area, endows the electrode with high capacitance of capacitor and energy density, has good charging-discharging repeatability, is easy to implement technological parameter control, is even to coat the nano carbon with the nano nickel oxide, and is suitable for industrialized mass production; and the prepared nickel oxide electrode is small in expansion and high in specific capacity, and has good charging-discharging performance, excellent inorganic ion electro-adsorption performance, long service life, and very high practical value.

The invention discloses a porous carbon nanobelt positive electrode material for lithium-sulfur battery, a preparation method thereof a positive electrode of lithium-sulfur battery, and a lithium-sulfur battery. The method for preparing the porous carbon nanobelt positive electrode material for lithium-sulfur battery comprises the following steps of: preparing a carbon nanobelt precursor; carbonizing and activating the carbon nanobelt precursor; and depositing elemental sulfur in the oxynitride co-doped porous carbon nanobelt. The porous carbon nanobelt positive electrode material for lithium-sulfur battery prepared by the preparation method of the invention has electrochemical properties such as large specific surface area, good wettability and high elemental sulfur content, significantlyimproved sulfur-fixing performance, and effective inhibition of the ''shuttle effect'' of poly sulfides. The positive electrode of lithium-sulfur battery and the lithium-sulfur battery contain the positive electrode material for lithium-sulfur battery prepared by the method of the invention.

The invention relates to the technical field of coating preparation, in particular to a preparation method of an anti-mold and anti-bacterial latex paint. The preparation method comprises the following steps: firstly, taking polyhydroxy konjac starch as a structure-oriented template, mixing the polyhydroxy konjac starch with sodium silicate, and finally, blending a mixture with a latex paint basematerial to obtain the anti-mold and anti-bacterial latex paint. By use of the anti-mold and anti-bacterial latex paint, the adsorption activity of a molecular sieve is improved, and a binding force between an inorganic antibacterial agent and the latex paint base material is favorably enhanced; the molecular sieve is further modified by using organosiloxane and organic acid, so that active hydroxyls on the surface of the molecular sieve and small organic molecules undergo condensation reaction, a binding force between the inorganic antibacterial agent and the latex paint base material is enhanced and the compatibility between the inorganic antibacterial agent and the latex paint base material is improved. The molecular sieve disclosed by the invention has unique properties of adsorption and selective ion exchange; silver has a sterilizing effect, and the latex paint can slowly release silver ions; when trace silver ions are in contact with a microbial cell membrane, bacterial cells die due to loss of division and proliferation capabilities, and a persistent sterilizing effect is realized; the anti-mold and anti-bacterial latex paint has a broad application prospect.

The invention provides an electrode material, a preparation method and its application. The electrode material uses coal tar pitch as a carbon source, uses nano-calcium oxide as a template, and uses potassium hydroxide as an activator; it is prepared through the following steps: S1, Weigh the raw materials according to the number of parts by mass; S2, grind the raw materials into powder and mix them; S3, put the mixed sample into the tube furnace and feed inert gas; S4, heat carbonization; S5, pickling to remove nano-calcium oxide; S6: Washing with distilled water; S7, drying the electrode material; the electrode material prepared by the method of the present invention has the characteristics of large specific surface area, appropriate pore size distribution range and high oxygen element content, these characteristics make the specific surface area utilization rate of the electrode material high, and the ratio is high. High capacitance, high energy density, and good cycle performance can be used as electrode materials for supercapacitors.

The invention relates to the crossing field of inorganic composite materials and new energy technology, and discloses an application for a graphene oxide / SiO2 composite material, aiming at solving the problems that a single graphene oxide material is easy to stack, low in electrochemical stability, poor in electricity storage performance, and the like at present. The application comprises the step of preparing a graphene oxide dispersion liquid at first, and then preparing graphene oxide / SiO2, and then treating the product to obtain the graphene oxide / SiO2 composite material, and finally mixing the graphene oxide / SiO2 composite material with a conductive agent, and pressing on a current collector by an adhesive to prepare an electrode material or further assembling to form an electricity storage component. The raw materials used in the application disclosed by the invention are common and easy to get, and low in cost; the preparation process is simple, safe, low in energy consumption, and high in operability; the composite material is good in electricity storage performance.