107results about How to "High active specific surface area" patented technology

The present invention discloses a nucleocapsid energizing agent for propelling agent and a method for preparing same, the energizing agent is a nucleocapsid structure energizing agent that carbon is encapsulated on a metallic oxide surfaced. The preparing method includes steps as follows: selecting one or some raw materials: address sugar, diose or soluble polysaccharide to mix according with random weight rate for confecting water solution 50-1500g/L, adding the surfactant or dispersant into the water solution, then adding the metallic oxide powder, the metallic oxide weight is 1-60% of the raw material total weight, the surfactants or dispersants weight is 0-4.5% of the metallic oxide weight, ultrasounding or stirring to distribute evenly, heating in 100-260 DEG C during 1-72 hours; reducing the product temperature to a room temperature, washing, centrifuging, removing the water-soluble impurity again and again, then vacuum drying for obtaining the nucleocapsid energizing agent. The nucleocapsid energizing agent has better compatibility with other component of the propelling agent, and has simple preparing technique, low cost, green process and is easy to mass production.

The invention discloses a catalyst using a metal oxide as a carrier for fuel cells and application thereof. The catalyst is characterized in that: the metal oxide as the carrier has catalytic oxygen evolution function simultaneously, and a noble metal with catalytic oxygen reduction function is supported on the metal oxide; the nanoparticles of the noble metal are highly dispersed on the surface of the metal oxide as the carrier, wherein the mass fraction of the noble metal is 2 to 70 percent in the catalyst. The catalyst alone or the catalyst mixed with platinum black in a certain proportionis applied to bifunctional oxygen electrodes for utilized regenerative fuel cells. Compared with the traditional mechanical mixture of platinum black and an oxide from catalytic oxygen evolution reaction, the fuel cell and water electrolysis performances of the cells are greatly improved, and the performance is close to that of a commercial Pt / C catalyst in fuel cells. The catalyst is applied to fuel cell oxygen electrodes to effectively solve the problems that the activity of the catalyst is deceased by the corrosion of the carrier.

The invention relates to a nano porous metal/conducting polymer composite material and a preparation thereof, belonging to the technical field of conducting polymer composite materials. The nano porous metal/conducting polymer composite material is characterized by comprising nano porous metal and a conducting polymer layer with the thickness of 1 nm-100 Mum; and after the conducting polymer layer is deposited, the three-dimensional continuous pore wall surface of nano porous metal is evenly covered. The nano porous metal/conducting polymer composite material does not need an adhesive; conducting polymer is directly and electrically polymerized on the nano porous metal pore wall prepared by the dealloying method; high conductivity of nano porous metal, relatively high activity specific surface area, and performance of conducting polymer are integrated, thereby further improving the high conductivity and activity specific surface area of conducting polymer, and improving the use efficiencies of conducting polymer in aspects of chemical catalysis and preparation sensors, storers, super capacitors and the like.

The invention relates to a preparation method of sulfur carbon nano composite material absorbent and application of the absorbent in recovery of heavy metal from a liquid phase or a gas phase. The preparation method of the absorbent comprises the following steps: fully stirring and mixing active carbon and sulfur substance in water by a vortex friction mixing method; and introducing molten-state sulfur substance on the surface in the pore canal of the active carbon particle by a melt infiltration method. In the sulfur carbon nano composite material, the sulfur substance is evenly attached on the surface and in pore canal of the active carbon material particle in an amorphous thin coating form. The sulfur carbon nano composite material has the remarkable characteristics of very large active specific surface area. The absorption principle is that a nano-thin layer of sulfur substance is used as a metal capture agent and a particle containing heavy metal, or steam, liquid drop and ion containing heavy metal to form a certain chemical action, and thereby the application that the heavy metal can be absorbed from the liquid phase and the gas phase can be realized.

The invention relates to a metal-doped nitrogen-containing carbon-based catalyst of a fuel cell and application of the catalyst. The catalyst adopts organic surface active agents as a protection agent and a structural guide agent and adopts an aromatic compound and aldehyde as reaction monomers, metal elements are added in the reaction process to obtain a polymer-metal compound, and the polymer-metal compound is dried and then is subjected to high-temperature processing with inert gas or/and ammonia gas to finally obtain the metal-doped nitrogen-containing carbon-based catalyst. When the metal-doped nitrogen-containing carbon-based catalyst is used as a cathode catalyst of a proton exchange membrane fuel cell and a direct-methanol fuel cell, the oxide reduction activity, stability and toxicity resistance are excellent; moreover, the catalyst has an environment-friendly effect, is low in cost, controllable in aperture, high in specific surface area and rich in resource and can substitute for platinum to serve as an electric catalyst of the proton exchange membrane fuel cell.

The invention discloses a boron-doped titanium dioxide nanotube film photoelectrode which comprises a titanium sheet substrate and a boron-doped titanium dioxide nanotube film layer that grows in situ on the titanium sheet substrate, and the boron-doped concentration is 0.46at.percent to 1.42at.percent by atomic percent. A preparation method of the photoelectrode comprises the following steps: a titanium dioxide nanotube grows on the titanium sheet substrate through adopting an anode oxidation method; and the boron is then doped into the titanium dioxide nanotube layer through adopting a chemical vapor deposition method. Compared with the conventional titanium dioxide film, the titanium dioxide nanotube has larger specific surface area and stronger absorption capacity, thereby the photocatalysis performance and the photoelectric conversion efficiency of the titanium dioxide film electrode are greatly improved, the photoresponse of the film electrode is further improved through doping the nonmetal boron, more particularly the photoresponse range of materials is expanded. The invention can be applied in the fields of solar energy utilization, photoelectric conversion, photocatalysis, photoelectrocatalysis degradation of organic matters, and the like.

The invention discloses a supported nanocatalyst for catalytic conversion of carbon dioxide. The supported nanocatalyst comprises active component Cu particles, carrier silica gel and an optional auxiliary agent, wherein based on the weight of a carrier, the percentage content of the active component Cu particles is 1-40%, and the percentage content of the auxiliary agent is less than or equal to 20%; the average size of the active component Cu particles is 1-20nm, and the active specific surface areas of the active component Cu particles are 100-400m<2>.g<-1>. The invention further discloses a preparation method of the supported nanocatalyst and application of the supported nanocatalyst for catalytic conversion of carbon dioxide in the synthesis of methanol by virtue of a carbon dioxide hydrogenation reaction and the carbon monoxide reaction.

The invention relates to the technical field of material preparation and electroanalytical chemistry, and concretely relates to a CoFe2O4NWs/RGO composite nano-material, and a paracetamol electrochemical sensor obtained through the composite nano-material. The composite nano-material is prepared through the following steps: S11, carrying out ultrasonic treatment on graphene oxide (GO) in water for 10-30 min, adding citric acid, and continuously carrying out ultrasonic treatment for 10-60 min to obtain a GO dispersion; S12, adding FeCl3.6H2O and CoCl2.6H2O to the GO dispersion, and carrying out ultrasonic treatment for 10-60 min; S13, adjusting the pH value of the above obtained dispersion to 9.5-10.5, adding hydrazine, stirring the dispersion and hydrazine for 30-120 min, and ageing the obtained mixture for 18-48 h; and S14, centrifuging the aged mixture, washing the centrifuged mixture, and drying the washed mixture to obtain the CoFe2O4NWs/RGO composite nano-material. An electrochemical electrode or the electrochemical sensor obtained through the composite nano-material has the advantages of good stability, low detection limit, high sensitivity and high selectivity in the paracetamol detection process.

The invention discloses a porous high-entropy alloy self-supporting electrode for electrolyzing water and a preparation method thereof. The preparation method comprises the following steps: smelting, mixing and melting nickel powder, cobalt powder, chromium powder, iron powder, aluminum powder and tungsten powder, and conducting cooling to form a high-entropy alloy with an eutectic structure; cutting the high-entropy alloy into an alloy sheet, and conducting polishing to remove surface oxide skins; then carrying out dealloying treatment; and after dealloying treatment is completed, taking out the alloy sheet and carrying out ultrasonic treatment so as to obtain the self-supporting electrode. The invention provides a simple, efficient and controllable dealloying means for treating the high-entropy alloy sheet to obtain the sheet-shaped high-entropy alloy self-supporting catalytic electrode with a multi-scale pore structure, and the sheet-shaped high-entropy alloy self-supporting catalytic electrode is proved to have excellent electro-catalytic hydrogen evolution/oxygen evolution reaction activity and stability.

The invention discloses a modified Ti3C2Tx material and preparation application thereof. The Ti3C2Tx material has a pleated structure and amorphous-form carbon, and is prepared through irradiating inTi3C2Tx aqueous dispersion by adoption of gamma rays or electron beams. Solvent free radicals generated in the irradiation process interact with Ti3C2Tx, thereby not only generating the amorphous-formcarbon on the surface of the Ti3C2Tx so as to improve the conductivity of the Ti3C2Tx material, but also inducing Ti3C2Tx fragments to be assembled into a chip layer with the pleated structure so asto increase the active specific area of the Ti3C2Tx material and facilitate the sufficient contact between the Ti3C2Tx material and electrolyte. The material serves as a supercapacitor electrode material, expresses favorable reversibility and stability in electrochemical performance test, and has a potential application value in the field of energy storage.

The invention discloses a novel modified Raney nickel catalyst, its preparation method and application. In the invention, an ultrasonic technology is applied in a process of dipping Raney nickel in a modifying agent. Substantive improvement is made to the modified Raney nickel technology, and the technology is essentially different from the ultrasonic cleaning after general catalyst preparation. The method involved in the invention has the advantages of simple process, low cost, and no adding of any environmental pollution. The prepared novel modified Raney nickel catalyst has greater active specific surface area, average pore size and pore volume compared with the Raney nickel that does not undergo ultrasonic treatment and the Raney nickel that undergoes molybdate dipping modification under the same conditions, and the content of oxide and impurities on the surface and in the catalyst itself is significantly reduced.

The invention discloses a method for preparing a flower spherical Co4S3@Co hydrogen evolution composite material grown on foam cobalt in an in-situ manner. The method particularly includes steps of ultrasonically cleaning the foam cobalt to carry out surface acid etching; weighing sulfur-containing compounds, dissolving the sulfur-containing compounds in deionized water and absolute ethyl alcoholmixed solution, adding a few reducing carbohydrate into the deionized water and absolute ethyl alcohol mixed solution, uniformly stirring the sulfur-containing compounds, the deionized water and absolute ethyl alcohol mixed solution and the reducing carbohydrate and then immersing the treated foam cobalt in the sulfur-containing compounds, the deionized water and absolute ethyl alcohol mixed solution and the reducing carbohydrate; transferring mixtures into high-pressure reaction kettles, carrying out solvothermal vulcanization reaction and then cooling, cleaning and drying reaction products;placing vulcanized foam cobalt in tube furnaces, carrying out programmed heating and calcining under gas protection, and preserving heat in reducing mixed protective gas to obtain flower spherical Co4S3 composite materials closely grown on the foam cobalt. The method has the advantages that the flower spherical Co4S3@Co hydrogen evolution composite material prepared by the aid of the method growsin the in-situ manner, is in close contact with the foam cobalt, is favorable for electric charge transfer and utilization and is excellent in electro-catalytic hydrogen production performance; the method includes simple processes, reaction conditions are mild, products are high in hydrogen evolution stability, and the like.

The invention relates to a preparation method of a titanium-based polyaniline-doped lead dioxide composite electrode material. The preparation method includes: pretreating a titanium substrate, preparing a PbO2 interlayer and preparing a polyaniline-doped PbO2 surface active layer, to be more specific, dispersing conductive polyaniline particles into an electrodeposition solution, using a composite electrodeposition method to evenly co-deposit polyaniline and PbO2 onto Ti/PbO2, and controlling conditions such as polyaniline use amount, deposition current density and deposition temperature and time to obtain the Ti/PbO2/PANi-PbO2 composite electrode material with a compact and even surface and evidently refined grains. The preparation method has the advantages that the adverse effect of non-conductive polymer doping on PbO2 conductivity is overcome, the use of polyaniline monomer is avoided, many uncertainties of the doping using the monomer electropolymerization reaction are avoided, and the performance stability of the polyaniline-doped PbO2 electrode material is guaranteed; the obtained electrode material is high in activity and stability, the dissolving stability of the obtained electrode material is evidently better than an undoped PbO2 electrode, and application safety of the PbO2 electrode in the electrooxidation treatment of non-biodegradable organic wastewater.

The invention relates to one 3D electrode for direct borane fuel battery anode method, which is characterized by the following steps: processing filling bed electrode or multi-hole electrode as three dimensional anode and alkalinity liquid fuel, wherein, the cathode contacts oxygen, air and auricome agent and the middle ion exchange isolation film forms direct borane fuel battery system; borane fuel materials touching three dimensional electrode and alkalinity compound with materials feeding type as through or back entering type.

The invention belongs to the field of hydrogen energy and fuel cell, and relates to conversion of transition metal compounds (including sulfides, phosphides, and oxides) nano arrays into metal salts (including borates, phosphates, carbonates, and compound systems thereof) nano arrays via electrochemistry oxidation polarization method, and electrochemistry water oxidation catalytic electrode at neutral and nearly-neutral environments. The electrochemistry water oxidation catalytic electrode possess larger active surface area and excellent electrolyte solution mass transfer performance, and is capable of reducing water oxidation energy barrier obviously, realizing low energy consumption water electrolysis hydrogen production, and promoting development of hydrogen production industry.

The invention relates to a nickel-additive-aluminum oxide-zirconium oxide catalyst which comprises aluminum oxide, zirconium oxide, nickel and additive at mass ratio of 100:(10.5-18.8): (12-21.3):(0.5-1.8). The pore volume of the catalyst is 0.4mL/g-0.6mL/g; the specific surface area is 120m<2>/g-180m<2>/g; the pore with the pore diameter within 30nm-45nm is 25%-35% of the total pore volume fraction; the pore with the pore diameter within 7nm-12.5nm is 20%-25% of the total pore volume fraction. The nickel-additive-aluminum oxide-zirconium oxide catalyst has the advantages of high stability and long service life.

The invention discloses a method for preparing 2,5-dimethylfuran by catalytic hydrogenation of 5-hydroxymethylfurfural, which comprises the following steps: reacting 5-hydroxymethylfurfural used as araw material in a reaction solvent under the action of a supported bifunctional catalyst in a hydrogen atmosphere to obtain the 2,5-dimethylfuran. The supported bifunctional catalyst herein comprisesa carbon carrier and an effective active component supported on the carbon carrier, wherein the carbon carrier is one of activated carbon, mesoporous carbon or nitrogen-doped mesoporous carbon, and the effective active component comprises oxides of nickel and manganese. The yield of the 2,5-dimethylfuran synthesized by the method is more than 90%; wherein the method is simple in process, high in selectivity, clean, environmentally friendly, small in catalyst dosage, capable of reducing cost and suitable for industrial production.

The invention discloses an electrochemical in-situ graphene synthesis-based modification method for a carbon-based electrode. According to the method, a three-electrode or two-electrode system is adopted to complete an electrochemical treatment process, wherein the electrochemical treatment can be (1) cyclic voltammetry or a (2) direct-voltage method. According to the cyclic voltammetry, a three-electrode working surface is arranged in a supported electrolyte solution; positive voltage scanning is applied to the carbon-based electrode, so that graphene oxide can be obtained in situ; and negative voltage scanning is applied to the carbon-based electrode, so that reduced graphene oxide can be obtained in situ. According to the direct-voltage voltage method, a three-electrode working surfaceor two-electrode working surface is arranged in a supported electrolyte solution, and a constant positive direct-current voltage is applied to the carbon-based electrode so as to treat the carbon-based electrode, so that graphene oxide can be obtained in situ; and a constant negative direct-current voltage is applied to the carbon-based electrode so as to treat the carbon-based electrode, so thateduced graphene oxide can be obtained in situ. Compared with conventional modification methods such as (oxidized) graphene drop-coating and in-situ vapor deposition, the method has the advantages of high speed, simplicity, low cost, green synthesis, high controllability, high reproducibility and high stability.

The invention discloses a preparation method of a nanosheet self-assembly ferrocobalt hydroxide. The preparation method is characterized by comprising the following steps: (S1) Co2+, Fe3+ and NO3- are used as solute ions for preparing electric deposition solution; (S2) foam nickel is used as a cathode; and graphite sheets are used as anodes to respectively dip in the electric deposition solution to obtain an electric deposition product; (S3) the electric deposition product prepared in the step (S2) is cleaned; and (S4) a sample prepared in the step (S3) is dried. The invention further discloses the nanosheet self-assembly ferrocobalt hydroxide prepared by the preparation method. The preparation method has such characteristics as simplicity, high efficiency, low cost and low environmental pollution, and facilitates large-scale technological production. The prepared nanosheet self-assembly ferrocobalt hydroxide greatly improves the nanosheet structure stability, meanwhile, prominently increases the activity specific surface area when serving as an electrode material, and accelerates the conveying speed of ions in the electrode materials.