283 results about "Cobalt phosphide" patented technology

The invention discloses a preparation method for a self-supporting metal-doped cobalt phosphide nano structure and an application of the self-supporting metal-doped cobalt phosphide nano structure as a catalytic electrode in water electrolytic hydrogen production, and belongs to the technical field of hydrogen energy and fuel cells. According to the invention, a metal element is firstly used as a doping agent for introducing cobalt phosphide, in-situ growth, on the surface of a collector, of the cobalt phosphide is realized, the catalytic activity and the structural stability are improved, the problem that a powder catalyst needs a polymer binder for being effectively fixed on the surface of the electrode is solved, and therefore, the self-supporting metal-doped cobalt phosphide nano structure is suitable for large-scale industrial hydrogen production application.

The invention discloses three-dimensional porous urchin-like cobalt phosphide as well as a preparation method and an application thereof. The preparation method comprises the steps of: uniformly mixing a cobalt salt and an amino compound in a neutral-polarity solvent to have hydrothermal reaction to prepare a three-dimensional urchin-like hydrated basic cobalt carbonate precursor mainly formed by assembly of nanowires; and annealing the hydrated basic cobalt carbonate precursor and hypophosphite at a high temperature to obtain the three-dimensional urchin-like cobalt phosphide. By preparing the three-dimensional urchin-like hydrated basic cobalt carbonate precursor by a simple hydrothermal process and obtaining the three-dimensional urchin-like cobalt phosphide through high temperature phosphorization, not only is the process simple and controllable, the source of raw material wide and the cost low, but also the yield is relatively high, and the mass production is realized. The prepared product is uniform in size, has an urchin-like porous structure, maintains more catalytic active sites, has high activity and excellent stability and is wide in application prospect in the field of electric catalysis.

The invention belongs to the technical field of materials and energy sources and particularly provides a metal phosphide/graphite carbon hybrid material and a preparing method and application thereof. A cobalt base-metal organic framework (ZIF-67) is utilized as a template and directly reacts with red phosphorus through heating, and the cobalt phosphide/graphite carbon hybrid material with the strong interface coupling effect is prepared in an in-situ mode. The hybrid material is formed by uniformly distributing and embedding cobalt phosphide nanometer particles in a polyhedron graphite carbon matrix. When used in the oxygen evolution reaction as a catalyst, the hybrid material shows high catalytic activity. The synthetic method is easy to operate, low in production cost and capable of achieving large-scale preparation, and is a novel efficient and economic preparing method.

The invention discloses an oxygen reduction and oxygen evolution Co2P@NPC double-function compound catalyst and a preparation method and application thereof. The compound catalyst comprises N-P-codoped carbon layer coated Co2P nano rods and/or nano particles. The preparation method includes: evaporating and drying the solution of cobalt acetate, concentrated phosphoric acid and urea, and performing high-temperature treatment under protective atmosphere to obtain the compound catalyst. The preparation method has the advantages that the method is simple, low in cost and beneficial to industrial production; the prepared oxygen reduction and oxygen evolution Co2P@NPC double-function compound catalyst is applicable to fuel cell and water decomposition, high in activity and good in stability, the catalytic performance of the compound catalyst is close to that of a commercial precious metal 20wt% Pt/C and RuO2 catalyst, and the compound catalyst is promising in application prospect.

The invention discloses a preparation method of a porous cobalt phosphide nanowire catalyst. The method comprises the following steps that a solution is prepared by taking urea as a precipitant, taking cobalt sulfate hepathydrate as a cobalt source and taking glycerin and deionized water as solvents; the solution is added into a high pressure reactor for a hydrothermal reaction, after sufficient reaction is achieved, suction filtration and washing are conducted, vacuum drying is conducted, and then linear basic cobalt carbonate is obtained; in a tubular furnace, air burning is conducted on the linear basic cobalt carbonate at certain temperature, and cobaltosic oxide is obtained; and sodium hypophosphite serves as a phosphorus source, a cobaltosic oxide precursor and sodium hypophosphite are placed at the two ends of the same porcelain boat according to a certain proportion, the phosphorus source is placed at the upper stream of airflow, the treated porcelain boat is put into the tubular furnace for lower temperature calcination in an inert atmosphere, and preparation of the porous cobalt phosphide nanowire catalyst is achieved. The preparation method of the porous cobalt phosphide nanowire catalyst has the advantages that the production technology is simple, the cost is low, electrochemical activity and stability of the catalyst can be effectively improved, and the method is wide in application.

The invention relates to a preparation method of a cobalt phosphide hollow nano-fiber material.The preparation method comprises the steps of adding cobalt salt to N, N-dimethylformamide, after the cobalt salt is dissolved, adding polyvinylpyrrolidone, conducting stirring, so that a precursor spinning solution is obtained, and conducting electrostatic spinning, so that a polyvinylpyrrolidone nanofiber membrane doped with cobalt ions is obtained; conducting pre-oxidation, and then conducting calcination at the temperature of 400-700 DEG C, so that a hollow tubular cobaltosic oxide nano-fiber is obtained; then mixing the hollow tubular cobaltosic oxide nano-fiber with sodium hypophosphite monohydrate, conducting a phosphorization reaction, and conducting cleaning and drying, so that the cobalt phosphide hollow nano-fiber material is obtained.The method is environmentally friendly in process and low in cost; the obtained cobalt phosphide hollow nano-fiber material is stable in chemical property and high in activity of electro-catalysis hydrogen evolution and expected to serve as an ideal high-performance electrochemical hydrogen evolution catalytic material.

The invention discloses a preparation method of a self-assembled ultrathin flower-like nickel cobalt phosphide electrocatalytic material, which is applied to the technical field of electrocatalysis. In the preparation method provided by the invention, a low-temperature hydrothermal-phosphating method is adopted in a preparation process, no additional precipitant is added in reaction, and a nickelsalt and a cobalt salt directly react with a solvent to generate OH-ions, thereby reducing the production cost, simplifying the process and being environmentally friendly. At the same time, an electrocatalytic active substance grown in situ on foamed nickel is directly used as a working electrode, not only avoiding the use of a binder, but also greatly enhancing the electrochemical activity of theactive substance. The self-assembled ultrathin flower-like nickel cobalt phosphide prepared by the method provided by the invention shows good electrocatalytic hydrogen evolution performance in an electrochemical test. In addition, compared with the traditional preparation method, the preparation method provided by the invention has the advantages of simple operation, relatively mild synthesis conditions, energy saving, cheap materials, environmental protection and the like.

The invention discloses a flexible three-dimensional porous nitrogen-doped carbon nanotube/cobalt phosphide composite material and a preparation method and application thereof. According to the flexible three-dimensional porous nitrogen-doped carbon nanotube/cobalt phosphide composite material and the preparation method and application thereof, low-cost commercial melamine sponges are used as a three-dimensional carbon material skeleton template, a zeolite imidazole structure metal organic framework is used as a cobalt source, phosphorization is carried out by a low-temperature vapor deposition method, and the flexible three-dimensional porous nitrogen-doped carbon nanotube/cobalt phosphide composite material with high conductivity and a high specific surface area is obtained. The preparation process of the flexible three-dimensional porous nitrogen-doped carbon nanotube/cobalt phosphide composite material is relatively simple, the cost is low, and the preparation process is suitable for industrial application. The flexible three-dimensional porous nitrogen-doped carbon nanotube/cobalt phosphide composite material is used as an electrode material for hydrogen evolution catalysis ofelectrolyzed water, and has lower hydrogen evolution catalysis overpotential, a larger electrocatalytic active area and excellent cycle stability.

The invention belongs to the field of water pollution control, and particularly relates to a nitrogen-doped porous carbon polyhedron@nanometer cobalt phosphide composite catalyst capable of efficiently activating persulfate and a preparation method of the composite catalyst. The preparation method comprises the steps that basic cobaltous carbonate nanowires are prepared by using a hydrothermal method, the basic cobaltous carbonate nanowires are phosphorized to obtain cobalt phosphide nanowires, a metal-organic framework ZIF-8 grows around the cobalt phosphide nanowires by using a self-assemblymethod, and through high-temperature calcination, the nitrogen-doped porous carbon polyhedron@nanometer cobalt phosphide composite catalyst is obtained. Compared with an existing heterogeneous catalyst, the composite catalyst has nonmetal catalysis activity and metal catalysis activity and is high in persulfate activating efficiency, high in free radical production, wide in pH application range and capable of being recycled and widely used, obviously reducing the consumption of a catalyst and a oxidizing agent and shortening reaction time.

The invention relates to a cobalt phosphide nano frame and a preparation and application thereof. The preparation of the cobalt phosphide nano frame comprises three steps that (1) a precipitation method is adopted for preparing Co-Co PBA NC; (2) etching is carried out in an ammonia solution to form a unique nano frame structure Co-Co PBA NF with open-type and hollow inner part; and (3) a low-temperature phosphating method is adopted to phosphorylate Co-Co PBA NF into CoP NF. When the cobalt phosphide nano frame is used as HER and OER electrocatalysts, the working voltage required for electrolysis of water can be effectively reduced, the electrolysis current density can be improved, and the cobalt phosphide nano frame has good catalytic stability.

The invention discloses a preparation method of a hollow carbon material which has dodecahedron morphology and is doped with hollow cobalt phosphide nanoparticles in situ and an application of the hollow carbon material in catalytic electrolysis of water for hydrogen production, and belongs to the technical field of catalytic electrolysis of water for hydrogen production. The method comprises specific steps as follows: (1) preparation of a metal organic framework material ZIF-67 containing cobalt ions and having dodecahedral morphology; (2) the cobalt-containing metal organic framework material ZIF-67 and a dopamine monomer are subjected to reaction, and a cobalt coordination doped hollow polymer nano-material is generated; (3) a cobalt oxide/carbon composite hollow nano-material is prepared; (4) a hollow cobalt phosphide/carbon composite hollow nanomaterial is prepared. The size of the material can be adjusted according to size of ZIF-67; in performance tests of water for hydrogen production in catalytic electrolysis, the electrode material used as a cathode shows very good electrocatalytic activity and stability. Therefore, the material has very good application prospect as the electrode material for catalyzing electrolysis of water for hydrogen production.

The present invention comprises a blend of polyester and a partially aromatic polyamide with an ionic compatibilizer and a cobalt salt. This blend can be processed into a container that has both active and passive oxygen barrier and carbon dioxide barrier properties at an improved color and clarity than containers known in the art. The partially aromatic polyamide is preferably meta-xylylene adipamide. The ionic compatibilizer is preferably 5-sodiumsulfoisophthalic acid or 5-zincsulfoisophthalic acid, or their dialkyl esters such as the dimethyl ester (SIM) and glycol ester (SIPEG). The cobalt salt is selected form the class of cobalt acetate, cobalt carbonate, cobalt chloride, cobalt hydroxide, cobalt naphthenate, cobalt oleate, cobalt linoleate, cobalt octoate, cobalt stearate, cobalt nitrate, cobalt phosphate, cobalt sulfate, cobalt (ethylene glycolate), or mixtures of two or more of these. The partially aromatic polyamide is present in a range from about 1 to about 10 wt. % of said composition. The ionic compatibilizer is present in a range from about 0.1 to about 2.0 mol-% of said composition. The cobalt salt is present in a range from about 20 to about 500 ppm of said composition.

The invention discloses a cobalt phosphide/nitrogen and phosphorus doped porous carbon material, a preparation method and application thereof in an air electrode catalyst of a zinc-air battery. The preparation method comprises the following steps: adding an organic ligand into deionized water to obtain a ligand solution; adding metal zinc and cobalt salt into deionized water to obtain a metal saltsolution; slowly adding a metal salt solution into the ligand solution, and carrying out a reaction completely; and centrifuging the mixed solution, cleaning the obtained lower precipitate with deionized water for multiple times, carrying out freeze drying, and carrying out in-situ phosphatization/carbonization treatment on the sample. According to the invention, a bimetallic skeleton compound isused as a catalyst precursor; metal phosphide grows on the surface of the heteroatom doped carbon material through in-situ phosphorization; the cobalt phosphide/nitrogen-phosphorus doped porous carbon material is used as an air electrode catalyst of a zinc-air battery, and long-time and high-stability charge-discharge circulation can be realized. The cobalt phosphide/nitrogen-phosphorus doped porous carbon material is used as the air electrode catalyst of the zinc-air battery.

The invention belongs to the technical field of nano hybrid materials and particularly relates to a nano cobalt phosphide-porous carbon nanofiber flexible membrane and a preparation method thereof. The nano cobalt phosphide-porous carbon nanofiber flexible membrane is prepared by: growing cobalt oxide nanoparticles in situ on porous carbon nanofibers having novel pore structure and converting theresultant to cobalt phosphide via gaseous reaction. The preparation method comprises: preparing a polyacrylonitrile/polystyrene nanofiber membrane via an electrospinning process; preparing a porous carbon nanofiber flexible membrane with novel pore structure by high-temperature carbonization; growing cobalt oxide nanoparticles in situ on the porous carbon nanofibers via a one-step hydrothermal process; converting the cobalt oxide nanoparticles into cobalt phosphide nanoparticles via gaseous reaction. The nano cobalt phosphide-porous carbon nanofiber flexible membrane and the preparation methodthereof have the advantages that operations are simple, the conditions are mild, the membrane is suitable for large-scale production, and the cobalt phosphide-porous carbon nanofiber hybrid materialprepared herein is an efficient flexible all-pH hydrogen evolution reaction catalyst membrane material.

This invention relates to electrode active materials, electrodes, and batteries. In particular, this invention relates to active materials comprising lithium or other alkali metals, iron, cobalt, and other transition metals, and phosphates or similar moieties.

The purpose of the present invention is to solve the current problems of environmental pollution and energy crisis, and create a simple method to prepare an amorphous cobalt phosphide/cadmium sulfide nanorod composite catalyst, thereby reducing the cost of the photocatalyst and increasing the hydrogen production rate of photocatalytic decomposition of water. The preparation method of the composite catalyst is green and environment-friendly, and the prepared composite catalyst has a long service life and still has high catalytic activity after 25 hours. The amorphous cobalt phosphide/cadmium sulfide nanorod composite catalyst prepared by the present invention has a simple synthesis method, high photocatalytic hydrogen production rate, good stability and low price, and can greatly save costs when applied in industrial production. A new type of catalytic material with great industrial photocatalytic hydrogen production prospects.

The invention provides a preparation method of nitrogen doped carbon nano-array loaded iron phosphide/cobalt phosphide. The method includes the steps: calcining polyaniline-iron cobalt metal organic framework in protective gas to obtain a precursor; performing phosphorization on the precursor in the protective gas under the heating condition to obtain the nitrogen doped carbon nano-array loaded iron phosphide/cobalt phosphide. A catalyst prepared by the method for loading a prepared novel phosphide on a nitrogen doped carbon nano-array is excellent in hydrogen producing performance, a materialmanufacturing process is easily controlled, long-time stability is good, low is lower as compared with an existing noble metal catalyst, and the catalyst can be applied to production of electrochemical cell hydrogen evolution electrodes.

The invention discloses a preparation method of cobalt phosphate powder material. The method comprises the steps of reacting soluble cobalt salt and soluble phosphate to obtain precipitate cobalt phosphate, and then adjusting the reaction system to be neutral with ammonia water; then carrying out suction filtration on the reaction system, washing, drying, grinding, and screening to obtain the cobalt phosphate powder material. The preparation method is simple, convenient to operate and low in cost; furthermore, the obtained product cobalt phosphate powder material is less in impurity content; the morphology and the particle size of the cobalt phosphate powder material obtained by the preparation technology are controllable, so that the demands on different battery materials can be met.

The invention belongs to the field of chemical hydrogen evolution energy, and particularly relates to a preparation method of a catalyst for hydrogen production based on Ru/rCoP composite material hydrolysis, which comprises the following steps: preparing a cobalt-based precursor, a cobalt phosphide (CoP) precursor and a phosphorus hole precursor (r-CoP); dispersing the phosphorus hole precursor (r-CoP) in water, adding a proper amount of ruthenium trichloride hydrate, and adding a sodium borohydride solution for reduction; performing centrifuging, washing and drying to obtain a phosphorus hole precursor loaded ruthenium composite material (Ru/r-CoP); by enriching the phosphorus hole loaded ruthenium nano composite material, the dispersity and conductivity of ruthenium loaded on a precursor are improved, so that the intrinsic catalytic activity is improved, and the Ru/r-CoP composite material shows efficient hydrogen evolution performance in an alkaline sodium borohydride aqueous solution; and an effective synthetic route is provided for preparing an efficient sodium borohydride hydrolysis hydrogen evolution catalyst.

The invention belongs to the field of hydrogen-generating materials, and specifically discloses a preparation method of a nitrogen-doped cobalt phosphide/nanocarbon compound material. A phosphorus source, a cobalt source and monomers for synthesizing gel are polymerized under a polymerization aid to obtain double-network hydrogel, wherein the phosphorus source is at least one of a polymer containing phosphonic acid groups and a monomer compound containing phosphonic acid groups; the double-network hydrogel is freeze-dried to obtain xerogel; the xerogel is calcined in a protective atmosphere at750-1,000 DEG C; a calcined product is compounded with a nanocarbon material to obtain the nitrogen-doped cobalt phosphide/nanocarbon compound material. The preparation method is simple, the sourcesof the raw materials are wide, the cost is low, and the obtained nitrogen-doped cobalt phosphide/nanocarbon material has excellent electrocatalytic performance and is expected to be applied in industrial production.

The invention discloses a cobalt phosphate nano-material as well as a preparation method and application thereof. A chemical general formula of phosphate is Co3(OH)2(HPO4)2, an auxiliary preparation size of a surfactant polyvinylpyrrolidone (PVP) is the nano-material of 0.5 micrometer to 1 micrometer. A surfactant auxiliary hydrothermal method is adopted, the preparation method disclosed by the invention has the advantages of being simple, easy to operate, low in cost, and environment-friendly, and a whole reaction process does not need special equipment, industrial production is facilitated,and the quality of the finally obtained product is higher. According to the phosphate nano-material prepared by adopting the method, the advantages of high conductivity of the material, more active sites, high electrocatalytic activity and the like are realized at the same time. The preparation material is a desired oxygen evolution reaction electrocatalytic material which has wide commercializedapplication prospect.

The invention relates to a graphene-based cobalt phosphide negative electrode material and preparation and application thereof. Graphene oxide (GO) with a two-dimensional structure is adopted as a substrate material, the prepared ZIF-67 is compounded with graphene, the composite material is reduced, and then the obtained aerogel composite material is subjected to calcination phosphorization to obtain the graphene-coated cobalt phosphide composite material (RGB@CoP). Compared with the prior art, the graphene-based cobalt phosphide negative electrode material prepared by the preparation method disclosed by the invention shows excellent electrochemical performance when being used as a negative electrode of a lithium ion battery, and under the charge-discharge current of 100 mA.g<-1>, the capacity can reach 608m Ah.g<-1>, and the excellent rate performance efficiency of 390 mAh.g<-1> under 5 A.g<-1> is stabilized at 90% or above.

The invention relates to a multi-level metal phosphide as well as a preparation method and application thereof. The multi-level metal phosphide comprises metal foam framework and metal phosphide covering the surface of the metal foam framework. Through macropores with the average pore diameter of 50-500 microns are distributed among the metal foam framework, and macropores with the average pore diameter of 10-100 microns are distributed on the surface of the metal foam framework; the metal phosphide is cobalt phosphide or iron-cobalt bi-metal phosphide; the metal phosphide is of a sheet line structure similar to a woven bag. The multi-level metal phosphide provided by the invention has excellent performance of catalyzing hydrogen evolution reaction and oxygen evolution reaction at the sametime under an alkaline condition, so that the multi-level metal phosphide can be used as a bifunctional electrocatalyst and can also be used as a cathode and an anode to catalyze electrochemical water decomposition reaction; good stability is shown on hydrogen evolution reaction, oxygen evolution reaction and electrochemical water decomposition.