331 results about "Thermal decomposition method" patented technology

The invention provides a preparation method of a nano porous metal oxide/carbon lithium ion battery cathode material. The preparation method comprises the following steps: firstly, weighting ferric salt or manganese salt and carboxylate organic ligands, and putting into a high-pressure reaction kettle; and after a polar solvent is added and dissolved, carrying out a hydrothermal reaction for 10-72h at 100-180 DEG C to generate a transition metal coordination polymer precursor; and after the transition metal coordination polymer precursor is washed and dried, decomposing the precursor for 0.5-6h at a temperature of 300-600 DEG C in an inert atmosphere in a tube furnace, thus obtaining a nano porous metal oxide/carbon lithium ion battery cathode material containing iron oxides or manganese oxides. According to the preparation method, since the transition metal coordination polymer precursor which is structurally designable and controllable is used as a template-type precursor, a nano porous metal oxide/carbon lithium ion battery cathode material is obtained by using an in-situ thermal decomposition method. The method is simple in process, and the obtained products have the advantages of high electrical conductivity, high specific capacity, good cycle stability, excellent high-ratio discharge performance and high energy density.

The invention discloses a nano loaded titanium-based electric catalytic film comprising a conductive microporous separating titanium film matrix and a catalytic coating. Furthermore, the invention also discloses a preparation method of the nano loaded titanium-based electric catalytic film, which comprises the following steps of: (1) preprocessing the titanium film matrix by sand blasting, alkali washing, and acid etching: soaking the matrix after sand blasting in an NaOH solution for 0.5 to 2h, then processing for 1 to 2h in an oxalic acid solution with the mass percent concentration of 10 percent after washing to a neutral state, washing with water and drying at 100 to 120 DEG C; and (2) preparing and loading a catalytic coating: preparing the catalytic coating by adopting a sol-gel method, a thermal decomposition method, an electrodeposition method or a chemical vapor deposition method and loading at the surface of the titanium film matrix and in a hole. Furthermore, the invention also discloses a film reactor comprising the nano loaded titanium-based electric catalytic film. According to the nano loaded titanium-based electric catalytic film, the defects on material strength, range limitation of working voltage, catalytic oxidation efficacy and the like in the prior art are solved.

The invention discloses a luminescent centre regionally doped rare earth upconversion luminescent material and a preparation method thereof, which relates to the technical field of structural design and preparation of luminescent materials. For solving the problems of small doping amount in the luminescent center and low luminescent efficiency of the rare earth upconversion luminescent material, the conventional materials of the same kind take NaYF4 as a matrix, are doped with rare earth sensitized ions and rare earth luminescent ions and has a core/shell structure and nanocrystalline micro structure, wherein a luminescent shell layer is coated outside the core/shell structure, and a sensitized layer is the outmost layer. The preparation method of the rare earth upconversion luminescent material comprises: after a trifluoroacetate thermal decomposition method is implemented, adding a luminescent shell layer precursor into solution of nanoparticle colloid with the luminescent core/shell structure, heating, and reacting to form the luminescent shell layer; cooling the product obtained by the previous step, adding a sensitized shell precursor layer, heating, reacting and obtaining a sensitized shell layer on the outside of the luminescent shell layer; and thus, obtaining the luminescent centre regionally doped rare earth upconversion luminescent material.

The catalyst has metal oxide without copper and noble metal as main active component and the composite oxide of RE and transition metal as the catalytic assistant, heat stabilizing assistant, structure stabilizing assistant and active catalyst component support. The addition of the composite oxide of RE and transition metal raises the reaction activity of the catalyst as well as its strength and stability greatly. The preparation process may be co-precipitation one, isometric soaking one or hot decomposition one. In the co-precipitation process or soaking process, adhesive and pore creating agent are added, and the adhesive and pore creating agent is mixture water solution of organic acids, inorganic acids, pseudo-thin diasphore and polymer. The catalyst may be used in hydrogen source system of fuel cell with unstable operation.

The invention belongs to the field of metal material and relates to a method for surface treatment of a titanium electrode substrate. The service life and the electrocatalysis performance of the titanium electrode are greatly increased by the abrasive blasting pretreatment to the substrate. The abrasive blasting treatment is carried out on the titanium substrate; the nozzle pressure of an abrasive blasting machine is 0.3-0.5MPa; the Al2O3 grinding medium of 70-90 meshes is adopted; the blasting angle is 45-90 degrees; the distance from the nozzle to a workpiece is 1-2cm; the coarsening time is 15-30s; the titanium substrate is then pickled for pickling treatment in a 10wt.% of oxalic acid solution for 1.5-2.5 hours at the temperature of 90-95 DEG C; a Ti/IrO2.Ta2O5 oxide coating electrode is prepared on the obtained substrate by a thermal decomposition method, wherein the Ir is chloro-iridic acid, Ta is tantalum pentachloride and the molar ratio of Ir to Ta is 7:3; a coating solution is uniformly coated on the pre-treated titanium substrate by a soft hair brush; the titanium substrate is dried for 10min at the temperature of 120 DEG C, is subsequently arranged in a box-type resistance furnace and sintered for 10min at the temperature of 450 DEG C; the above operations of coating, drying and sintering are repeatedly carried out by 5-20 times; and the final sintering is carried out for 1h at the temperature of 450 DEG C. The method provides optimum pretreatment parameters, greatly prolongs the service life of the titanium electrode, effectively improves the electrocatalytic activity and greatly reduces the running and repairing cost for the electrode.

The invention discloses a preparation method of a carbon encapsulated magnetic C/Fe3O4 nano composite material and an application thereof. The invention belongs to the technical field of a magnetic nano-material, and the carbon encapsulated magnetic C/Fe3O4 nano composite material can be prepared by using a hydrothermal method and a thermal decomposition method through synthesis. The carbon encapsulated magnetic C/Fe3O4 nano composite material is used for processing a dye methylene blue in waste water. The preparation method has the beneficial effect of simple process, high material purity, wide application scope, no residues, no toxic and side effect, and easy separation, and can be expected for wide application in environment engineering field.

The invention discloses an electrode material with an intermediate Ti4O7 coating and belongs to the technical fields of hydrometallurgy and electrochemistry metallurgy. Titanium, aluminum and a titanium alloy or an aluminum alloy are taken as the inner core structure of an electrode, the surface of the electrode is coated with Ti4O7 which has excellent chemical performance such as low electrical resistivity, high activity, good electrochemical corrosion resistance and the like, so that the electricity conduction performance of the electrode is improved and an inner core material is protected; then a high-activity low-price metal oxide coating is prepared with an electroplating method or a high-activity rare metal oxide coating is prepared with a thermal decomposition method on the surface of the electrode. Current distribution of the electrode material is uniform, the purity of an electro-deposition product is high, the polarization potential of the composite electrode of the intermediate Ti4O7 coating is reduced by 70-188 mV than that of a traditional ti-based electrode, the current density is increased by 40-230 mA, the catalytic activity of the electrode is improved, the electrode potential is reduced in the practical use process, and energy conservation and consumption reduction are realized.

The invention provides a nano-mesoporous micro-spherical Ln-Bi5O7I photocatalyst and a preparation method thereof. The nano-mesoporous micro-spherical photocatalyst is 15-30 nm in surface mesopore diameter, is 1-5 [mu]m in average particle size and has an orthorhombic crystal form, wherein nBi + Ln : nI = 0.85-1:1, and nLn : nBi = 0.01-0.055:1. The preparation method includes the steps of: dissolving a bismuth salt, an iodine salt and nitrate containing rare earth ions respectively in certain-quantity ethylene glycol, performing ultrasonic oscillation, adding the rare earth ion solution to the bismuth-containing solution, adding the iodine-containing solution, and performing magnetic stirring to form a precursor Ln-BiOI; performing a hydrothermal reaction to the precursor to prepare Ln-BiOI powder; and maintaining the temperature of the Ln-BiOI at 425-525 DEG C to prepare the Ln-Bi5O7I powder. The Ln-Bi5O7I photocatalyst has homogeneous appearance, has large specific surface area, is strong in stability and has excellent photocatalytic performance in degradation of rhodamine B, methyl orange, phenol, bisphenol A and the like. The method combines advantages of both hydrothermal and thermal-decomposition methods.

The invention belongs to the field of photocatalyst, and specifically relates to a Bi2WO6 (bismuth tungstate) composite photocatalyst, a preparation method thereof, and an application thereof. The Bi2WO6 composite photocatalyst comprises components of, by weight: 1-99% of Bi2WO6 and 1-99% of TiO2. The Bi2WO6 composite photocatalyst can be prepared through a coprecipitation method, a thermal decomposition method, a hydro thermal method, a solvent thermal method, or a sol-gel method. The Bi2WO6 composite photocatalyst provided by the invention has advantages of high catalytic activity, good cyclical stability, and wide photoresponse range. The Bi2WO6 composite photocatalyst can be widely applied in respects of sewage processing, air conditioning, and sterilizing. The Bi2WO6 composite photocatalyst has a wide application prospect.

The present invention provides a thin film-forming method by which, even when a thin film containing a crystalline metal oxide as the main component is formed over a wide area within a short time utilizing a thermal decomposition method, the thickness of the thin film becomes relatively uniform. A thin film-forming method of the present invention includes forming a thin film using a raw material containing a chloride of a metal, and prior to the forming of the thin film, 1) disposing metal-containing particles on the substrate, or 2) forming, at a film deposition rate slower than a film deposition rate for the thin film, a metal-containing thin film on the substrate, and wherein, in the case of the step 2), the thin film containing the metal oxide as the main component is directly formed on the metal-containing thin film.

The invention relates to a nano mesoporous microspherical Bi5O7I photocatalyst and a hydrothermal-thermal decomposition preparation method thereof. The Bi5O7I photocatalyst is of a nano mesoporous microspherical shape; the average particle size of microspheres is 1 to 5 microns, and the average aperture of mesoporous on the surface of the microspheres is 7 to 9 nm. The method comprises the following steps: respectively dissolving bismuth salt and iodine salt into quantitative ethylene glycol, performing ultrasonic oscillation treatment, slowly adding iodine salt solution into bismuth salt solution after complete dissolving, performing magnetic stirring to obtain a precursor BiOI, performing hydrothermal reaction on the precursor to prepare BiOI powder, heating the powder body in a tubular furnace under high temperature for decomposition, and preserving the temperature for 2 h to prepare Bi5O7I powder. The Bi5O7I powder prepared by the hydrothermal-thermal decomposition method has the characteristics of uniform shape, high stability and good photocatalysis performance, integrates the advantages of the hydrothermal method and the thermal decomposition method, and is short in reaction time, simple in technological process, lower in raw material cost and suitable for industrial popularization and application.

The invention provides a preparation method of a lanthanum-gadolinium co-doping titanium-based lead dioxide electrode. Rough processing is carried out on the surface of a titanium-based body, a tin antimony oxide bottom layer is prepared in a plating mode through a thermal decomposition method, then an alpha-PbO2 layer is electroplated in an alkalinity mode, finally a beta-PbO2 layer containing rare-earth metal oxide is electroplated in an acidity mode, and the lanthanum-gadolinium co-doping titanium-based lead dioxide electrode is prepared. Through the co-doping of the lanthanum and the gadolinium, a certain synergistic effect is achieved, the provided electrode can process and degrade organic matters under the normal temperature and the normal pressure, processing effect is good, cost is low, and good application value is achieved.

The invention relates to a positive electrode of a layered oxide lithium ion battery and a preparation method thereof. The positive electrode includes a pole piece and a carbon layer on the pole piece. The carbon layer is formed by magnetron sputtering under an inert atmosphere using a graphite target The carbon source is formed by sputtering on the surface of the pole piece. The present invention uses the magnetron sputtering method to coat the positive electrode with carbon, which breaks through the limitation of the traditional thermal decomposition method to coat the positive electrode material, and prepares the positive electrode of the carbon-coated lithium-rich layered structure oxide lithium ion battery. By using the carbon layer The effect of effectively preventing the side reaction between the active material and the electrolyte during the charging and discharging process improves the cycle stability and rate performance of the positive electrode of the layered lithium-rich lithium-ion battery. Experiments have found that it can meet the requirements of power lithium-ion batteries.

The invention provides a metal-metal oxide pH electrode and a preparation method thereof. The method comprises the following steps of: using a chemically stable metal filament is used as a basal body, removing the original oxide film on the surface of the metal filament by mechanical polishing and chemical cleaning, and forming a IrOx (x=1 to 3) active oxide film sensitive to hydrogen ion on the treated metal filament surface with the thermal decomposition method. Comparing with glass pH electrode and conventional metal-metal oxide pH electrode, the inventive metal-metal oxide pH electrode has the advantages of simples preparation method, low cost, easiness for batch production, high mechanical strength, low fracture liability, small volume, high sensitivity of pH measurement, and rapid response speed, wide response range; and is suitable for pH measurement of low-temperature solution with wide pH range, particularly solution below zero degree (such as anti-freezing fluid and refrigerating fluid).

The invention relates to a preparation method of a copper-based nano solar battery material, which belongs to the preparation technique of semiconductor nano solar battery materials. A metallic compound is taken as a precursor, mercaptan, elemental sulfur, elemental selenium and the like as sulfur raw materials, and oleylamine, oleic acid, 1-octadecene and TOPO (Tri-Octyl-Phosphine Oxide) as a main high-boiling-point solvent. By adopting a thermal decomposition method, the copper-based nano solar battery material which is different in morphology, good in crystallinity degree, good in monodispersity, controllable in phase structure and adjustable in optical property is prepared under unharsh reaction condition, thus basis is established for application and industrial production of the high-quality nano copper-based solar material in the aspects of solar battery preparation and photocatalyst design. The copper-based nano solar battery material has the characteristics of controllable product property, high quality, simple production process, environmental-friendliness and the like, and is easy to industry.

A multifunctional air purifying device for removing indoor pollution by a thermal decomposition method comprises an air treatment unit and an air collection heater. The air collection heater is provided with an infrared lamp tube and an ultraviolet lamp tube. An annular water tank is arranged on an inner side of the upper part of the air treatment unit. A filter screen runs through the annular water tank and is connected with an air cap, and a fan is provided at a joint between the filter screen and the air cap. The filter screen includes an early effect filter screen, a HEPA filter screen, an activated carbon filter screen and a cold catalyst filter arranged in that order from a bottom to a top. A humidifier connects the annular sink and a nozzle located at an exhaust port.

A process for preparing the fibrous NiCo alloy powder and the fibrous nickel cobalt oxide powder features that a depost-transforming thermal decomposition method is used, which includes synthesizing the deposit of their precursor in Ni-Co-NH3-NH4-SG-C2O4-H2O system and the precursor is thermally decomposd ni oxidizing atmosphere to obtain fibrous nickel cobalt oxide powder, or the precursor is thermally decomposed in non-oxidizing atmopshere to obtain fibrous NiCo alloy powder.