82 results about "Cobalt atom" patented technology

The invention relates to an ultrathin nanosheet array electro-catalytic material with a nano-porous structure and oxygen vacancies. The material is a cobaltosic oxide primary nanosheet array which grows vertically on a conductive substrate and is doped with a metal; an ultrathin nanosheet with oxygen vacancies and nanopores is obtained on each primary nanosheet; the conductive substrate is a titanium sheet or a foamed nickel sheet, and the doped metal is zinc, nickel or manganese; and the thickness of each cobaltosic oxide ultrathin nanosheet doped with the metal is 1.22 nm, nanosheets are in a three-dimensional porous structure, and the nano-pore diameter is 3-6 nm. The ultrathin nanosheet array electro-catalytic material with the nano-porous structure and oxygen vacancies has the following advantages: the material can effectively reduce the overpotential and the spike potential of an oxygen evolution reaction, increase the conversion rate of a single cobalt atom and work continuously and stably in an alkali environment; the steps of a preparation method of the material are simple, the operation is convenient, the cost is low, and the material is environmental-friendly; and new ideas and strategies are provided for the function-oriented design and the performance optimization of an oxygen evolution catalyst of a water electrolysis system.

The invention belongs to the technical field of catalysis and relates to a method for preparing a monatomic cobalt catalyst by roasting silicon dioxide pellets and immobilizing metalloporphyrin. The method is realized by adopting the following technical scheme: namely stirring and dispersing nano silicon dioxide particles, dropwise adding 3-aminopropyl triethoxy silane, so as to obtain amino modified SiO2 pellets, then linking monocarboxyl metalloporphyrin (CoTPCPP) onto an amino modified SiO2 carrier through organic complexing, carbonizing porphyrin through high-temperature calcination in an inert atmosphere, and loading highly dispersed cobalt atoms onto the amino modified SiO2 pellets, thus an amino modified silicon dioxide pellet loaded monatomic cobalt catalyst is obtained. The monatomic dispersion catalyst has high catalytic activity and stability on a molecular oxygen selective ethylbenzene catalytic oxidation reaction in absence of solvent; meanwhile, a preparation method is simple, and product quality can be easily controlled, so that the monatomic dispersion catalyst is applicable to the fields of alkane selective oxidation reactions and synthesis of medical intermediates.

A method for preparing hollow nanofibers having carbon as a primary component by contacting a carbon-containing compound with a catalyst at 500 to 1200° C., wherein the catalyst is one of a zeolite exhibiting thermal resistance at 900° C. and, supported thereon, a metal; a metallosilicate zeolite containing a heteroatom except aluminum and silicon and a metal; a supporting material and fine cobalt particles exhibiting a binding energy of a cobalt 2P3/2 electron of 779.3 to 781.0 eV; a supporting material and fine cobalt particles exhibiting a cobalt atom ratio in the surface of the supporting material of 0.1 to 1.5%, as measured by the X-ray photoelectron spectroscopy at 10 kV and 18 mA; a supporting material and fine cobalt particles exhibiting a weight ratio of cobalt to a second metal component of 2.5 or more; and a zeolite having a film form and a metal.

The present invention provides a nickel atom-, manganese atom- and cobalt atom-containing composite carbonate that is high in specific surface area and large in tap density, and useful as a raw material for producing a lithium nickel manganese cobalt composite oxide to be used in a positive electrode active material for use in a lithium secondary battery, and provides a method for industrially advantageously producing the composite carbonate. The composite carbonate includes nickel atoms, manganese atoms and cobalt atoms, and has an average particle size of 5 μm or more and less than 20 μm, a BET specific surface area of 40 to 80 m²/g and a tap density of 1.7 g/ml or more.

A single-cell-thickness nano porous cobalt oxide nanosheet array electrocatalytic material is characterized in that a metal-doped cobalt oxide primary nanosheet array is perpendicularly grown on a conductive substrate, a porous nanosheet is obtained from each primary nanosheet, and the nanosheets are of porous structure; the material is used as an electrocatalyst for oxygen evolution reaction; the material also has excellent hydrogen evolution performance and may function as a bifunctional catalyst for an alkaline full-decomposition water system. The invention has the advantages that the material can effectively reduce overpotential and peaking potential of oxygen evolution reaction, increase conversion rate of single cobalt atoms and operate stably and continuously in a strong alkali environment; the material has excellent oxygen evolution reaction performance and can be applied as an anode and cathode of a full-decomposition water system, effectively reducing trough voltage; the material is simple to prepare, convenient to operate, low in cost and environment-friendly, and new idea and strategy are provided for the guide design and performance optimization of the bifunctional catalyst for the full-decomposition water system.

The invention discloses a high-abundance monatomic cobalt-array electrocatalytic hydrogen-production nano material based on the monatomic size effect. According to high-abundance monatomic cobalt-array electrocatalytic hydrogen-production nano material, on the basis that a hydrothermal method is used for preparing laminar molybdenum disulfide and a solvothermal method is used for preparing cobalt nanosheets, the cobalt nanosheets are modified to the surface of the molybdenum disulfide material through an ultrasonic bonding method; and then through the method that electrochemical scanning is conducted on an obtained heterostructure of the cobalt nanosheets and the molybdenum disulfide under an acid condition, redundant cobalt atoms on the surface are removed, and finally, the high-abundance monatomic cobalt-modified molybdenum disulfide lamellar nano material is obtained. The novel electrocatalytic material has good electrochemical hydrogen-production catalytic performance.

A new electrochemical method for determining dissolved oxygen concentration is developed. It employs cobalt based oxide or complex to modify a conductive electrode surface. This method can be applied to determine dissolved oxygen in regard to medical and environmental demands. The chemical formula of the cobalt based oxide or complexes can be shown as Co_xO_y or Co_aL_b. Both “x” and “a” represent the number of cobalt atom; while “y” and “b” represent the number of oxygen atom and the number of coordinating ligand, respectively. For instance, the best known example of cobalt oxide is CO₃O₄, and the best known examples of cobalt complexes are cobalt phthalocyanine (CoPC) and cyanocobalamin (vitamin B₁₂), or other macrocyclic complexes with a metallic nucleus of cobalt. The present invention determines the concentration of dissolved oxygen in solution in potentiostatic mode with three electrodes. As a result, the dissolved oxygen can be determined between 0.0V and −0.3V vs. Ag/AgCl, thereby significantly reducing the interferences from the easily oxidized compounds in water solutions.

The invention discloses a gas sensor and a preparation method thereof. The gas sensor is provided with a gas sensitive layer; the gas sensitive layer comprises a gas sensitive material film and a gas sensitive electrode; the sensitive material of the gas sensitive material film is a cobalt-doped black phosphorus material and has the thickness like that of 1 to 10 atom layers; the black phosphorus material is prepared from red phosphorus and iodide of tin; the atomic number of the cobalt atoms doped in the black phosphorus accounts for 2 to 10 percent. The invention further discloses the application of the gas sensor to detection of carbon monoxide gas, and the preparation method of the sensor. According to the gas sensor provided by the invention, the combining capability of the gas sensitive material and the carbon monoxide is improved, the absorption of gas molecules is promoted and the stability of the gas sensor is guaranteed; the sensitivity of the gas sensor and the selectivity on the carbon monoxide gas are improved; the gas sensor based on the two-dimensional material black phosphorus can be made to be thin.

Provided is lithium secondary cell and positive electrode active material, positive plate, and method for manufacturing them. A lithium secondary cell comprises a positive electrode active material containing a crystal in which the size of crystallite in the direction parallel to the (003) plane of the crystal of lithium cobaltate is 800 ANGSTROM or more and the coordinate number of a cobalt atom with respect to another cobalt atom is 5.7 or more. The characteristics such as the rate characteristics, low-temperature characteristics, and cycle characteristics of the lithium secondary cell are improved. By adding preferable modes of the positive plate, for example, (a mode in which 50% or less of the surface of the positive electrode active material is covered with an electrically conductive material), (a mode in which the porosity of the positive electrode coating layer lies in the range from 0.08 cc/g to 0.14 cc/g by using two kinds of electrically conductive material having a particle size of 3 mu m or more and 2 mu m or less or by using one kind of electrically conductive material having a particle size of 10 mu m or less), and (a mode in which the specific area of the positive plate coating layer lies in the range from 0.5 m<2>/g to 1.0 m<2>/g by using an electrically conductive material containing at least carbon black), and further adding a mode of a combination of a preferable negative electrode active material and a preferable electrolyte, a more preferable lithium secondary cell has a sufficient cell capacity, and excellent characteristics such as the cycle characteristics, preservation characteristics, safety, and low-temperature characteristics.

The invention relates to a non-noble metal doped carbon felt, and an application in catalyzing oxygen reduction, and belongs to the technical field of fuel cells. Specifically, the invention provides a non-noble metal doped carbon felt with a three dimensional conductive structure prepared by methods of in-situ polymerization and non-noble metal coordination pyrolysis. The carbon felt can be used for electrochemically catalyzing the oxygen reduction. The non-noble metal doped carbon felt material takes a common carbon felt material as a skeleton, forms a polymer film on the carbon felt surface by in-situ polymerization of nitrogen-containing heterocyclic ring molecules, then absorbs cobalt atoms by a coordination effect and finally form a cobalt and nitrogen doped carbonized layer on the carbon felt surface. The carbon felt material is prepared by the invention. The non-noble metal doped carbon felt has similar capacity for catalyzing the oxygen reduction with that of a commercialized platinum catalyst, and has very good stability and methanol poisoning resistance.

The invention relates to an isopropanol gas sensor based on a NiCoxFe2-xO4 (x=0.01-0.1) nano cube material prepared through a metal organic framework template and a preparation method of the sensor and belongs to the technical field of gas sensors. The sensor is composed of a Al2O3 substrate with a PD metal interdigital electrode and a NiCoxFe2-xO4 nano cube material sensitive layer prepared by adopting a coating technology on the PD metal interdigital electrode and the Al2O3 substrate from bottom to top in sequence, and the grain size of a nano cube is 50-80 nanometers. When the cube is dopedwith trace cobalt, due to the radius difference of cobalt atoms and iron atoms, the lattice defects are possibly caused, the defects are beneficial to generation of oxygen vacancies, oxygen absorption is enhanced accordingly, and the gas sensitive response is improved. The technology is simple, and the prepared sensor is small in size and suitable for large-batch production and has important application value.

The invention discloses a cobalt complex with electrochemical catalytic activity and a preparation method thereof. The cobalt chemical combined electro-catalysis material is a cobalt complex with a certain spatial structure, the molecular formula of the cobalt complex is C3OH26CoN10O4S2. The preparation method of the cobalt complex chemical combined electro-catalysis material comprises the following steps: enabling sulfadiazine with conjugate big Phi bond, 2, 2'-dipyridyl and cobalt ions with electro-catalysis activity to be subjected to chemical reaction, so as to obtain the novel cobalt complex containing sulfadiazine and dipyridyl. According to the invention, the cobalt complex has electro-catalysis activity, accurate spatial structure and molecular formula; cobalt atoms can form a stable coordination bond with a ligand by using the empty d electronic orbit of the atoms, so as to facilitate electron to be transmitted, and further facilitate the proceeding of the electrochemical reaction; the prepared cobalt complex has good electro-catalysis activity, and has wide application prospects as an electro-catalysis active material.

The invention provides a method for selectively hydrogenating an alpha, beta-unsaturated carbonyl compound. The method for selectively hydrogenating the alpha, beta-unsaturated carbonyl compound comprises the steps that first, a cobalt metal precursor and a carbene ligand are coordinated in a solution to obtain a cobalt complex, and the cobalt complex selectively enables the alpha, beta-unsaturated carbonyl compound to be reduced into a corresponding saturated carbonyl compound in a hydrogen atmosphere under the activation of an activator. The method for selectively hydrogenating the alpha, beta-unsaturated carbonyl compound has the main advantages that cobalt is used as a catalyst, and metal cobalt is cheap and easy to obtain relative to noble metal such as palladium, ruthenium, osmium, iridium and platinum, and the catalyst cost is greatly reduced; secondly, the carbene ligand used in the method has the advantages of simple structure, low price, strong coordination ability with cobalt atoms compared with a commonly used phosphine ligand; and finally, the addition of the activator can further significantly increase the activity of the cobalt catalyst. The hydrogenation reaction condition is mild, the reaction rate is high, substantially no carbonyl hydrogenation side reaction occurs, and the carbonyl compound can be obtained in a high yield.

The invention provides a boriding method of a wear-resisting composite member. The boriding method comprises the following steps: a) preheating the wear-resisting composite member by adopting a hot spray gun so as to rise the temperature of the surface of the wear-resisting composite member to be 800 DEG C-850 DEG C; b) spraying a boriding agent to the surface of the wear-resisting composite member obtained from the step a to obtain the wear-resisting composite member with the boronized surface. When the wear-resisting composite member is subjected to boriding, the wear-resisting composite member is preheated by using the hot spray gun, so that the temperature of the surface of a workpiece is high, the internal temperature of the workpiece is lower than the surface temperature of the workpiece, the brazing connection position of the composite member can not be affected, the connection strength of the composite member can not be affected, after the wear-resisting composite member is preheated, the boriding agent is sprayed to the surface of the composite member, the boriding agent is subjected to reaction under high temperature so as to generate active boron atoms, the active boron atoms combine with cobalt atoms and tungsten atoms melt in the surface, so as to form a compound, so that a boriding layer of a boron compound is formed.

The invention discloses a positive electrode active substance used in lithium secondary battery, and a manufacturing method thereof. The positive electrode active substance is a lithium composite oxide of a positive electrode active substance comprising Ti atoms, wherein the substance has a general formula of LixNi1-y-zCoyMnzTiaO2. x is no lower than 0.95 and no higher than 1.30; y is no lower than 0 and no higher than 0.6; z is no lower than 0 and no higher than 0.8; and y+z is smaller than 1, and a is no lower than 0 and no higher than 0.1. According to the manufacturing method, a lithium compound, a compound comprising nickel atoms, cobalt atoms and manganese atoms, and titanium oxide are mixed; and the mixture is calcined, such that the positive electrode active substance comprising the lithium composite oxide with the general formula is obtained. With the positive electrode active substance, lithium secondary battery with excellent circulation characteristics can be obtained. Also, the preparation method is simple. With the method, the positive electrode active substance can be manufactured through an industrial beneficial method.

The present invention is generally directed to a method of prophylaxis against viral infection of a cell or subject or a method of treating a subject infected with a virus including administering an antiviral composition having the general Structure III,

The invention discloses a dual-function catalyst for preparing cyclic carbonates through cycloaddition of CO2 and an epoxy compound and a preparation method thereof. Tetrakisbenzene and Salen-Co complexes are adopted as a precursor to be subjected to a reaction to obtain the dual-function catalyst containing bromine negative ions and metal cobalt atoms. The dual-function catalyst has the advantages that the preparation method of the catalyst is simple and easy to implement, the production cost is low, the catalytic activity and selectivity are high, no solvent or auxiliaries need to be added into a reaction system, reaction conditions are mild, and the preparation method is expected to become a clean CO2 cycloaddition technological path with the huge competitiveness.

The invention provides a preparation method of a polybutadiene, which comprises the following steps: under the actions of a cocatalyst and a cobalt complex disclosed as Formula (I), carrying out polymerization reaction on butadiene in an organic solvent to obtain polybutadiene. In the polybutadiene preparation process, the cobalt complex disclosed as Formula (I) and the cocatalyst are used as the catalyst, the electrophilic chlorine atoms introduced into the ligand structure of the cobalt complex increase the electropositivity of the active center cobalt atom, thereby endowing the butadiene monomer with larger coordination space; and thus, the cobalt complex has higher catalytic activity, so the polybutadiene has higher yield. The experiment proves that the yield of polybutadiene is 72-97% in the butadiene catalytic polymerization process of the cobalt complex.

The invention relates to the technical field of super-hard composite materials, in particular to a method for prolonging the endurance life of a diamond compact and the diamond compact. The method forprolonging the endurance life of the diamond compact includes the steps: irradiating an interface between a substrate and a diamond layer and the surface of the diamond layer by ultra-fast pulse laser beams; polishing the surface of the diamond layer. The diamond compact is manufactured by the ultra-fast pulse laser beams, a gradient transition layer is generated between layers, so that the substrate and the diamond layer are firmly combined, and sudden change of a thermal quantity and a mechanical quantity on the interlayer interface is avoided. The surface (cold annealing) of the diamond layer is irradiated by the ultra-fast pulse laser beams, thermal stress concentration and lattice defects of the diamond layer can be eliminated, D-D bonds on the surface of the diamond layer can be firmly bonded, cobalt atoms are 'extruded' to the surface of the diamond layer, a rich cobalt layer is removed by polishing, ultra-high surface smoothness is realized, the high-temperature resistance ofthe diamond compact is improved, and the service life of the diamond compact is prolonged.

The present invention relates to a nitrogen-doped carbon microsphere loaded with cobalt nano-particles and a preparation method thereof. The material can be taken as an oxygen reduction reaction active electrode material. The microsphere is a yolk-shell structure microsphere with the diameter of 500-800 nm, the surface of the microsphere is uniformly loaded with nano-sized cobalt particles, and the size of each nano-sized cobalt particle is 10-80 nm. According to the microsphere, the nitrogen-doped carbon microsphere loaded with the cobalt nano-particles is prepared by adopting the method of composite carbonization of resin ball(s) and metal organic frame material(s) for the first time; the catalyst improves the dispersibility of cobalt atoms via nitrogen doping, so that catalytic site exposure is increased, and the catalytic activity rises; and the method has the advantages of simple process, short synthesis cycle and cheap and easily available raw materials.