36 results about "Nickel(II) oxide" patented technology

The invention relates to a spinel type high-entropy oxide electrode material and a preparation method thereof, and belongs to the field of nanomaterial preparation and new energy. The chemical formulaof the high-entropy oxide electrode material is one of (FeCoNiCrMn)O, (FeZnNiCrMn)O, (FeCoZnCrMn)O and (FeCoNiCrMnCu)O. The preparation method includes the steps of 1) mixing and ball-milling iron oxide, chromium oxide, manganese oxide and M metal oxide, wherein the M metal oxide is two or more of nickel oxide, zinc oxide, copper oxide and cobalt oxide; and 2) carrying out high-temperature calcination, and obtaining the spinel type high-entropy oxide electrode material by adopting a cooling mode of furnace cooling, air quenching and liquid nitrogen quenching. The particle diameter of the high-entropy oxide is 100-500nm, and the high-entropy oxide is determined to be in a spinel structure according to XRD; and the space group of the material is Fd-3m, and the specific surface area is 5-100m<2>g<-1>.

This patent uses cotton cloth as raw material, carbonizes it into carbon cloth, and obtains flexible supercapacitor electrode base material with high specific surface area, oxyge functional groups andgood mechanical properties then through mixed acidification treatment. The obtained treated carbon is added into ferric trichloride hexahydrate, Cobalt chloride hexahydrate, nickel chloride hexahydrate and ethanol solution after a period of time, ammonium bicarbonate is added and continuously stirred, after that reaction is completed, the mixture is washed with deionize water several times, dried, calcined in a high-temperature tubular furnace for a period of time, and taken out after the mixture is cooled to room temperature, so as to prepare an iron cobalt nickel oxide/carbon cloth composite flexible electrode material. By adjusting the reaction time and the amount of iron, cobalt and nickel sources to control the loading amount and morphology of multicomponent transition metal oxides,the flexible supercapacitor electrode materials with good flexibility and excellent electrochemical performance were prepared.

The invention belongs to the field of new materials and new energy resources, and particularly relates to carbon-coated nickel oxide/metallic nickel (NiO/Ni) and a simple synthesis method of the carbon-coated NiO/Ni. The simple synthesis method comprises the following steps that soluble nickel salt, organic fuel and combustion additives are weighed and mixed to form an aqueous solution through preparation, and the aqueous solution is stirred and dissolves, so that a transparent solution is formed; the solution is heated to be at the temperature ranging from 50 DEG C to 100 DEG C, and moisture is continuously evaporated, so that the solution is in a sticky gel state; the gel is heated to be at the temperature ranging from 140 DEG C to 290 DEG C, self-propagating combustion of the gel happens, black loose powder can be obtained, and the obtained powder is added to solvent to be cleaned and dried, so that a high-purity target material is obtained. According to the invention, the technology is simple, operation is easy, and the raw materials are low in cost and easy to obtain. The prepared NiO/Ni is high in crystal quality, the conductive capacity of the carbon-coated NiO/Ni is enhanced through black carbon, and the carbon-coated NiO/Ni can be applied to devices such as lithium ion batteries and supercapacitors. The technological cost is low, conventional multi-step complex technologies, the long technology period and high-priced devices are avoided, and the carbon-coated NiO/Ni is applicable to large-scale industrial production.

The invention discloses a modified nickel oxide negative material. Nickel oxide with a hollow structure is taken as a matrix and is doped with metal elements (including one or more of lithium, sodium and potassium). A preparation method of the modified nickel oxide negative material comprises the following steps: dissolving metal element nitrate and nickel nitrate in water for mixing uniformly to obtain a mixed liquor, and then performing spray pyrolysis treatment on the obtained mixed liquor, thereby obtaining the modified nickel oxide negative material, wherein a metal element is one or more of lithium, sodium and potassium, and the molar concentration ratio of metal ions and nickel ions in the mixed liquor is equal to (1:100)-(10:100). The nickel oxide negative material has a hollow spherical feature, so that diffusion paths of lithium ions are reduced, and the volume change in a circulating process is alleviated to a certain degree. As nickel oxide is doped with the metal elements including lithium, sodium and potassium, the conductivity of the material is improved, the charge transfer impedance is lowered, and the electrochemical performance of a battery is improved.

The invention discloses a method for preparing nickel oxide/zinc oxide heterojunction nanometer materials. By the aid of the method, the technical problem of low sensitivity of nickel oxide/zinc oxide heterojunction nanometer materials prepared by the aid of existing methods can be solved. The technical scheme includes that the method comprises synthesizing nickel oxide/zinc oxide heterojunction pre-sintered powder from mixed solution by the aid of a one-step hydrothermal process; calcining the nickel oxide/zinc oxide heterojunction pre-sintered powder to obtain the nickel oxide/zinc oxide heterojunction nanometer materials. The mixed solution is prepared from nickel acetate tetrahydrate, zinc nitrate hexahydrate and sodium hydroxide. The method has the advantages that the method only includes one reaction step instead of two reaction steps in the prior art, and the reaction time is shortened and is 12 h instead of the reaction time of 60 h in the prior art; as shown in gas sensitivity tests, the working temperatures of gas sensors made of the nickel oxide/zinc oxide heterojunction nanometer materials prepared by the aid of the method are lowered and are 200 DEG C instead of the working temperatures of 330 DEG C in the prior art; the sensitivity of the gas sensors for 100 ppm acetone gas is improved and reaches 15-17 instead of the sensitivity of 12 in the prior art.

The invention provides a nickel oxide-titanium dioxide nano composite material, belonging to the technical field of inorganic functional materials. The nano composite material is prepared by preparing a strip-shaped Na2Ti8O17 precursor from TiO2 serving as a basic raw material and a NaOH solution serving as a reaction solvent by using a hydrothermal method, then soaking, pickling and performing suction filtration to obtain strip-shaped H2Ti8O17, and putting the strip-shaped H2Ti8O17 into a muffle furnace for calcining for 2 hours so as to obtain a TiO2 nano strip; by taking urea, nickel nitrate, water and TiO2 as raw materials, keeping the temperature of 120 DEG C for 4-6 hours by using a homogeneous precipitation method, and then calcining for 2 hours at 400 DEG C so as to obtain a novel nickel oxide-titanium dioxide one-dimensional nano composite material which has the advantages of no toxicity, low cost, no pollution, high specific capacity, good security, good catalytic performance and the like, and has wide application prospects in fields such as lithium ion batteries, photocatalysis and the like.

The invention discloses a preparation method of a carbon nanotube and nickel oxide composite material, and belongs to the technical field of nano-materials. Firstly by a hydrothermal method, a spherical structure is prepared by using a Ni(No3)26H2O and D-glucose mixing solution; the prepared nickel hydroxide of the spherical structure is placed on a silicon-based plate, argon is fed into a chemical vapor deposition system, then heating is performed to enable nickel hydroxide to be converted into nickel oxide; then hydrogen is simultaneously fed into the chemical vapor deposition system to reduce partial nickel oxide balls to nickel simple substances; and then ethene gas is fed, and carbon nanotubes grow on the surface of the partially reduced nickel oxide balls in an in-situ catalytic manner. By adopting the method, the nickel oxide and carbon nanotube composite material can be prepared simply and highly efficiently. Compared with the prior art, by adopting the method, the combination of nickel oxide and carbon tubes is more tighter, the electricity conductivity is better, the composite material is more stable, so that the performance of the composite material is effectively improved. The composite material has a wide application prospect in the field of electrochemistry devices such as a super capacitor and a lithium battery.

The invention discloses a preparation method of nano nickel oxide used for propane catalytic combustion reaction and particularly relates to a preparation method of a microenvironment containing nano nickel oxide regulated and controlled by trace variable-valence metal. The catalyst disclosed by the invention is prepared from the following components by mol percentage: 0-95% of nickel and the trace variable-valence metal M (M is Mn, Co and Fe); and hydrogen peroxide is introduced into a variable-valence metal salt to regulate and control a metal valence of the variable-valence metal, so that the nickel oxide is subjected to microenvironment regulation and control, and the redox property and the oxidization property are improved. The preparation method disclosed by the invention is simple and raw materials are cheap and easy to obtain, so that the preparation method is suitable for large-scale and production; and a catalytic material obtained by the invention has an extremely good catalytic property on low-concentration C3H8 and the like.

The invention discloses a nanocrystalline metal oxide functionalized carbon nanotube material and a formaldehyde gas sensor prepared by using the material. The material comprises carbon nanotube and nickel oxide, and the mass ratio of the carbon nanotube to the nickel oxide is (1:0.1)-(1:30). The nanocrystalline metal oxide functionalized carbon nanotube material provided by the invention, can have a well response to the formaldehyde gas when used as gas sensitive material applied to the formaldehyde gas sensor through special proportion between the carbon nanotube and the nickel oxide, is relative low in cost, and can facilitate the industrialized implementation of the formaldehyde gas sensor.

The invention discloses a hydrodesulfurization catalyst for removing sulfur compounds in medium/low-temperature coal tar and an application thereof, belongs to the technical field of hydrodesulfurization catalysts for coal tar, and aims to provide a catalyst which can deeply remove the sulfur compounds in the coal tar and has relatively high denitrification capacity, relatively high mechanical strength, relatively high water resistance, a certain specific surface area, proper pore volume and proper pore diameter. The technical scheme is as follows: the catalyst consists of an active ingredient, a carrier and an aid, wherein the carrier accounts for 60 to 75 percent of the total weight of the catalyst; the active ingredient accounts for 18 to 26 percent of the total weight of the catalyst; the aid accounts for 7 to 14 percent of the total weight of the catalyst; the active ingredient consists of metal tungsten, nickel and molybdenum; and based on metal oxides for calculation, tungsten trioxide accounts for 12 to 16 percent of the total weight of the catalyst; nickel oxide accounts for 5 to 7 percent of the total weight of the catalyst; and molybdenum trioxide accounts for 2 to 5 percent of the total weight of the catalyst.

The invention discloses a preparation method of a porous titanium-substrate-loaded nickel oxide (nickel hydroxide) electrode with an electroconductive ceramic interface. The preparation method includes (1), ball-milling and mixing metal titanium hydride powder and nickel powder to obtain a metal powder mixture;(2), putting a certain amount of the metal powder mixture into a steel die, and performing pressurization to obtain a metal pressed blank; (3), putting the metal pressed blank into a tubular furnace, and controlling sintering atmosphere and temperature time to obtain the porous titanium-substrate-loaded nickel oxide electrode with the electroconductive ceramic interface; (4), washing the surface of the electrode by dilute acid and deionized water; (5), in nickel nitrate, depositing acertain amount of nickel hydroxide on the surface of the electrode according to a cathodic polarization method to obtain the porous titanium-substrate-loaded nickel hydroxide electrode with the electroconductive ceramic interface. The preparation method has the advantages that the porous electroconductive ceramic interface TinO2n-1-Ti*NiOy generated during high-temperature hypoxic sintering is utilized, contact resistance between active substances and a substrate is reduced, and contact strength between the active substances and the substrate is improved.

The invention discloses a nickel oxide/copper oxide composite nanomaterial with a hollow sphere structure and a preparation method of the nickel oxide/copper oxide composite nanomaterial. The preparation method comprises steps as follows: nickel salt and bivalent copper salt are dissolved in a solvent, a mixed solution is obtained, a polymer-supported reagent and urea are added to the mixed solution in sequence and stirred until the polymer-supported reagent and urea are dissolved completely, then a mixture is subjected to a hydrothermal reaction, an obtained product is further calcined, and the nickel oxide/copper oxide composite nanomaterial with the hollow sphere structure is obtained after calcination. Compared with the prior art, the raw materials are cheap and available, a template is not required to be added to a reaction system for obtaining of the hollow structure, the synthesis process is simple, the obtained product is controllable in structure and size, and product yield ishigh.

The invention relates to a preparation method of a magnesium oxide-nickel oxide-titanium dioxide composite material and belongs to the technical field of the inorganic nonmetallic material. The magnesium chloride, nickel chloride and titanyl sulfate are taken as the raw materials, the preparation method comprises the following steps: preparing the solution from the raw materials in parts by weight: 80-90 parts of MgO, 5-10 parts of NiO, 5-10 parts of TiO2, adding alkali and titrating, controlling the ph value to be 12-13 to obtain the precipitate, washing, drying, keeping the temperature for 0.5-1h at 600-650 DEG C to obtain the composite powder, dry pressing the composite powder via the pressure more than 150MPa, keeping the temperature for 3h at 1400-1500 DEG C and calcining to obtain the composite material. The composite powder prepared by the method is high in purity and small in granularity; the oxides are evenly mixed and the activity is great; the composite material is obtained by calcining the composite powder, the firing temperature is low, the clinker structure is compact, the apparent porosity is low and the hydrate resistance property is good.

The invention discloses a 5V spinel nickel lithium manganate material and a preparation method thereof. The method comprises the following steps that 1, lithium salt, a nickel salt or nickel oxide, a manganese salt or manganese oxide, a metallic salt or metallic oxide and simple-substance carbon are mixed to be uniform to obtain a material; 2, primary roasting is performed on the material in a roasting kiln, and primary treatment matter is obtained; 3, the primary treatment matter and zirconium oxide are mixed to be uniform, secondary matter to be roasted is obtained, secondary roasting is performed on the secondary matter to be roasted in an air atmosphere in the roasting kiln, and then the 5V spinel nickel lithium manganate material is obtained. The molecular formula of the 5V spinel nickel lithium manganate material is (0.995-0.998)[Li(1-1.5)Ni(0.5)Mn(1.5-x)MxO4]/(0.002-0.005)ZrO2, wherein M is selected from Fe and Ti, x=0.01-0.05, and the structure comprises three layers from inside to outside. The preparation method is simple and high in applicability, and the prepared product is high in specific capacity and good in cycle performance.

The invention discloses a preparation method of ultrafine WC-Ni composite powder and belongs to the technical field of preparation of hard alloy materials. Violet tungsten oxide, nickel oxide and carbon black are used as raw materials, a nanoscale initial mixture with all phases dispersed evenly is obtained through stirring, grinding and refining firstly and then is placed in a vacuum furnace for in-situ reduction and carbonization reaction, and the WC-Ni composite powder in the ultrafine particle size is synthetized in one step. The metal oxide is high in brittleness, the raw materials can be refined and evenly mixed through ball milling for a short time, and the energy barrier for production of WC through continuous carbonization of W produced through reduction of the violet tungsten oxide is effectively reduced through formation of an intermediate product W-Ni-C in the in-situ reaction process, so that the synthetic temperature of WC and Ni is substantially reduced. Thus, compared with a traditional method, the method has the advantages that the technological process is short, the cost is low, the dispersity of Ni in the prepared powder is good, and adjustment of the composition and the particle size of the powder is facilitated.

The present invention discloses a heteropolyacid ammonium salt type catalyst and a preparation method thereof. The catalyst comprises an active component and an auxiliary agent-containing carrier, wherein the active component is a heteropolyacid ammonium salt, the carrier is silicon oxide containing auxiliary agents such as nickel and boron, the heteropolyacid ammonium salt content is 3-35% by adopting the weight of the catalyst as the reference, and the auxiliary agents comprise (calculated as the oxide) 3-18% of nickel oxide, 1-6% of boron oxide and 41-93% of silicon oxide. According to the present invention, the catalyst is particularly suitable for the ethylene preparation reaction through dehydration by using the low-concentration ethanol aqueous solution as the raw material, and has advantages of high low-temperature activity, high selectivity, high carbon deposition resistance and good stability.

A synthetic method for a lithium ion cathode material LiNiO2/C is characterized by comprising the following steps of: 1) adding water and mixing nickel oxide and an organic carbon source, carrying out spray granulation after ball-grinding treatment, and pre-treating the obtained powder in an inert atmosphere to obtain carbon-coated nickel oxide powder; 2) dissolving a lithium source in the water, adding the nickel oxide powder obtained in the step 1), and carrying out spray granulation after ball-grinding treatment to obtain dried powder; and 3) treating the dried powder obtained in the step 2) in the inert atmosphere, carrying out high-temperature heat treatment, and performing air classification, thereby obtaining the lithium ion cathode material LiNiO2/C. According to the synthetic method, nickel oxide is firstly coated with carbon, so that lithium nickel oxide is prevented from agglomeration due to subsequent high-temperature treatment, over large grains of the lithium nickel oxide are prevented, the conductivity of the material is improved, and the cycling stability of the lithium nickel oxide is enhanced.