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31results about How to "Favorable for adsorption and desorption" patented technology

High-efficiency porous Ni-Mo hydrogen evolution electrode and preparation method thereof

InactiveCN106191916ALarge real surface areaCatalytic hydrogen evolution activity is highMolten spray coatingElectrode shape/formsMaterials scienceOxide
The invention discloses a high-efficiency porous Ni-Mo hydrogen evolution electrode and a preparation method thereof. The preparation method of the high-efficiency porous Ni-Mo hydrogen evolution electrode comprises the steps that firstly, an oxide layer and grease substances on the surface of a nickel net or foamed nickel are removed through mechanical shearing, degreasing (alkali-washing degreasing or electrolytic degreasing), and acid pickling; secondly, Ni particles, Mo particles and Al particles are evenly mixed according to a certain proportion and then sprayed onto a pretreated conductive substrate in a plasma spraying way; thirdly, a sprayed electrode is subjected to alkali washing, so that active Al metal is removed; and finally, the electrode treated with alkali liquor is placed in a tubular furnace for high-temperature thermal reduction. According to the electrode, molybdenum nanoparticles are used as a molybdenum element source to be evenly doped into a catalyst layer, so that a plating structure which is excellent in hydrogen evolution capacity, provided with the uniform catalyst layer and high in hydrogen evolution activity is formed. The active Al metal is removed through alkali washing, so that a porous structure is formed on the surface of the electrode, a reaction active site is enlarged, and the hydrogen evolution activity is improved. According to the preparation method of the high-efficiency porous Ni-Mo hydrogen evolution electrode, operation is simple, the production cost is low, and the catalyst layer is firm in structure. The hydrogen evolution catalytic active electrode prepared through the method can be widely applied to the alkaline water electrolysis industry.
Owner:天津市大陆制氢设备有限公司

High-performance mesoporous-micro double hole controllable molecular sieve adsorbent and preparation and application thereof

The invention belongs to the technical field of air pollution control and particularly relates to high-performance mesoporous-micro double hole controllable molecular sieve adsorbent and preparation and application thereof. The preparation method includes the following steps that a silicon source, an aluminium source, a microporous structure guide agent, a mesoporous template agent, organosilane and water serve as raw materials for synthesizing mother liquor, the mother liquor assists into a hydrothermal reaction through microwaves, a product obtained through the reaction is subjected to centrifugation, drying and calcinations, and the high-performance mesoporous-micro double hole controllable molecular sieve adsorbent is obtained. According to the high-performance mesoporous-micro double hole controllable molecular sieve adsorbent and preparation and application thereof, an efficient method is utilized for preparing a mesoporous type zeolite molecular sieve which is high in specific surface, high in pore volume and high in adsorptive property, the synthesis time is greatly shortened, and the synthesis process is simplified. The synthesized zeolite type molecular sieve adsorbent is of a hierarchical pore structure, the pore diameter is adjustable, the mass transfer resistance is small, high adsorptive property of VOCs is achieved, high hydrophobic property and hydrothermal stability are achieved, and the high-performance mesoporous-micro double hole controllable molecular sieve adsorbent has high application value in the field of VOCs processing technologies.
Owner:SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP

Fuel-cell catalyst Pt/WO3 and application thereof

The invention relates to a preparation method of a fuel-cell catalyst Pt / WO3. According to the preparation method of the fuel-cell catalyst Pt / WO3, a Pt / WO3 electro-catalyst is obtained through taking mesoporous WO3, which is prepared by taking a mesoporous silicon-oxide molecular sieve as a template, as a carrier, and pouring the reduced Pt / glycol liquid onto a WO3 carrier material. The preparation method has the advantages that the preparation conditions are mild, the operation is easy, Pt can be carried on a non-carbon carrier, and the application range of the preparation method is expanded. The Pt / WO3 has excellent electrochemical activity and stability when the Pt / WO3 serves as an anode catalyst of a proton exchange membrane fuel cell.
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI

Nitrogen dioxide sensor based on orderly-channel Ni-doped mesoporous indium oxide and preparation method thereof

The invention provides a nitrogen dioxide sensor based on orderly-channel Ni-doped mesoporous indium oxide and a preparation method thereof and belongs to the technical field of semiconductor oxide gas sensors. The nitrogen dioxide sensor is composed of a Al2O3 insulating ceramic tube 2, a Ni-Cr alloy heating coil 1 and sensitive material films 4, wherein the outer surface of the Al2O3 insulating ceramic tube 2 is provided with two discrete annular gold electrodes 3, the Ni-Cr alloy heating coil 1 penetrates through the Al2O3 insulating ceramic tube 2, and the outer surface of the Al2O3 insulating ceramic tube 2 and the annular gold electrodes 3 are coated with the sensitive material films 4. Each annular gold electrode 3 is connected with a pair of platinum wires 5. The sensitive material films 4 are obtained by being coated by orderly-channel Ni-doped mesoporous indium oxide. An orderly-channel Ni-doped mesoporous indium oxide material can provide a large specific surface area, and more active sites are provided easily. More oxygen vacancy defects are introduced to Ni-doped indium oxide, sensitivity is improved easily, and the nitrogen dioxide sensor has wide application prospects in the aspect of detection of the nitrogen dioxide content in the microenvironment.
Owner:JILIN UNIV

In<2>O<3>/Li<0.5>La<0.5>TiO<3> hydrogen sulfide gas sensitive composite material and preparation method and application thereof

The invention discloses a preparation method of an In<2>O<3> / Li<0.5>La<0.5>TiO<3> hydrogen sulfide gas sensitive composite material. The preparation method comprises the following steps: (1) lanthanumnitrate, citric acid, lithium nitrate, tetrabutyl titanate and ethylene glycol are sequentially added into a certain amount of ethanol, and evenly stirred and mixed for standby application; (2) a certain amount of indium nitrate is added into mixed liquid in the step (1), and stirred till being completely dissolved, and a mixed solution is obtained; (3) the mixed solution in the step (2) is transferred into a reaction kettle for a solvent thermal reaction; and (4) after the reaction in the step (3) is completed, natural cooling is conducted, then centrifuging is conducted, an obtained productis dried and annealed, and then the In<2>O<3> / Li<0.5>La<0.5>TiO<3> hydrogen sulfide gas sensitive composite material is obtained. Compared with hydrogen sulfide gas sensors reported in most of literature, as for the prepared In<2>O<3> / Li<0.5>La<0.5>TiO<3> hydrogen sulfide gas sensitive composite material, the response and recovery time is shortened, hydrogen sulfide gas can be quickly detected, and detected hydrogen sulfide is wide in range.
Owner:ZHENGZHOU UNIV

Three-dimensional layered Co-Al double hydroxide composite material and preparation method and application thereof

The invention provides a three-dimensional layered Co-Al double hydroxide composite material and a preparation method and application thereof, relates to a double hydroxide composite material and a preparation method and application thereof, and aims at solving the problem that the cost of an existing NOx sensor is high. The three-dimensional layered Co-Al double hydroxide composite material is prepared from cobalt nitrate, aluminum nitrate, ammonium fluoride and a precipitating agent. The preparation method comprises the steps that the raw materials are weighed and put into deionized water toobtain a mixed solution, the mixed solution is subjected to a hydrothermal reaction, obtained precipitates are subjected to impurity removal, washing and drying, and then the three-dimensional layered Co-Al double hydroxide composite material is obtained. The three-dimensional layered Co-Al double hydroxide composite material is high in sensitivity, short in response time, simple in preparation method, good in capacity of resisting interference of the external environment and low in cost and has the adsorption reversibility. The preparation method is suitable for preparing the three-dimensional layered Co-Al double hydroxide composite material.
Owner:HEILONGJIANG UNIV

Method for removing salt by virtue of sphagnum-derived biomass carbon electrode

The invention discloses a method for removing salt by virtue of a sphagnum-derived biomass carbon electrode. The method specifically comprises the following steps: (1) carbonizing sphagnum, and uniformly grinding the carbonized sphagnum into powder; (2) mixing biomass carbon, carbon black and PTFE in a proportion, and uniformly stirring the mixture; (3) uniformly smearing the surface of graphite paper with the mixture so as to prepare electrode slices, and heating drying the electrode slices; and (4) with the dried electrode slices as an anode and a cathode, putting two electrodes into an electrodeionization reactor, pumping saline water into the reactor by virtue of a peristaltic pump, carrying out circular treatment, and applying the voltage to two ends of the electrodes for deionizationtesting. According to the invention, the sphagnum is utilized as an initial material for the first time for preparing biomass derived carbon through a carbonation process, and a CDI electrode prepared from the biomass carbon material as an active substance has the advantages of large specific surface area, reasonable pore structure, excellent conductivity and water tolerance and the like.
Owner:BEIJING UNIV OF CHEM TECH

A kind of high-performance mesomicro double-porous controllable molecular sieve adsorbent and its preparation and application

ActiveCN105251441BEfficient method to prepare high pore volumeEfficient way to prepare highly adsorbentOther chemical processesAluminium silicatesDielectricSorbent
The invention belongs to the technical field of air pollution control, and in particular relates to a high-performance mesomicro double-pore controllable molecular sieve adsorbent and its preparation and application. The preparation method comprises the following steps: using silicon source, aluminum source, microporous structure directing agent, mesoporous template agent, organosilane and water as raw materials to synthesize a mother liquor, the mother liquor utilizes microwave-assisted hydrothermal reaction, centrifuges the reaction product, drying and calcining to obtain the high-performance mesomicro double-pore controllable molecular sieve adsorbent. The invention uses an efficient method to prepare the mesoporous zeolite molecular sieve with high specific surface area, high pore volume and high adsorption performance, which greatly shortens the synthesis time and simplifies the synthesis process. The zeolite-type molecular sieve adsorbent synthesized by the present invention has a multi-level pore structure, adjustable pore size, low mass transfer resistance, high adsorption performance for VOCs, and high hydrophobicity and hydrothermal stability, and has a high level in the technical field of VOCs treatment. application value.
Owner:SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP

Three-dimensionally cross-growing urchin-like monocrystalline selenium and preparation method thereof

The invention discloses three-dimensionally cross-growing urchin-like monocrystalline selenium. A preparation method of three-dimensionally cross-growing urchin-like monocrystalline selenium comprisesthe following steps: 1) dissolving PVP (polyvinylpyrrolidone) and a selenium source in deionized water respectively, then uniformly mixing the two solutions, adding a reducing agent L-ascorbic acid under the condition of magnetic stirring for a reaction at room temperature, and performing centrifugal washing to obtain precursor nano-selenium balls; 2) dispersing the obtained nano-selenium balls in a mixed solution of ethanol and water, leaving the mixture to stand for self-growing at normal temperature to obtain three-dimensionally cross-growing urchin-like monocrystalline selenium. Three-dimensionally cross-growing urchin-like monocrystalline selenium is proposed for the first time, and has a unique three-dimensional micro-nano structure; the process is simple, energy-saving and environmentally friendly, any hydrothermal or heating reactions are not needed, the reaction period is short, the yield is high, and the method has quite good application prospect in the fields of energy conversion, storage and the like.
Owner:WUHAN UNIV OF TECH

Noble metal ruthenium monatomic supported catalyst as well as preparation method and application thereof

The invention discloses a noble metal ruthenium monatomic supported catalyst as well as a preparation method and application thereof. The catalyst comprises a sulfide carrier and ruthenium dispersed on the surface of the sulfide carrier in a monatomic form, and the proportion of single ruthenium atoms is 0.01-10% by mass of the ruthenium-based catalyst. The CO2 adsorption capacity, the photo-generated charge separation capacity, the light absorption capacity, the photo-thermal conversion capacity and other properties of the catalyst are obviously improved. The preparation method has the advantages of simple and rapid preparation and cost saving, and can realize monatomic dispersion of high-specific-gravity noble metal ruthenium on the surface of cadmium sulfide. According to the monatomic dispersed ruthenium noble metal catalyst prepared by the method, the dispersity of noble metal is improved, the use cost of the noble metal is reduced, and the photo-thermal catalytic reduction of CO2 and high CH4 selectivity of the catalyst are ensured.
Owner:INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI

A kind of sea urchin-shaped single crystal selenium grown by three-dimensional cross growth and its preparation method

The invention discloses three-dimensionally cross-growing urchin-like monocrystalline selenium. A preparation method of three-dimensionally cross-growing urchin-like monocrystalline selenium comprisesthe following steps: 1) dissolving PVP (polyvinylpyrrolidone) and a selenium source in deionized water respectively, then uniformly mixing the two solutions, adding a reducing agent L-ascorbic acid under the condition of magnetic stirring for a reaction at room temperature, and performing centrifugal washing to obtain precursor nano-selenium balls; 2) dispersing the obtained nano-selenium balls in a mixed solution of ethanol and water, leaving the mixture to stand for self-growing at normal temperature to obtain three-dimensionally cross-growing urchin-like monocrystalline selenium. Three-dimensionally cross-growing urchin-like monocrystalline selenium is proposed for the first time, and has a unique three-dimensional micro-nano structure; the process is simple, energy-saving and environmentally friendly, any hydrothermal or heating reactions are not needed, the reaction period is short, the yield is high, and the method has quite good application prospect in the fields of energy conversion, storage and the like.
Owner:WUHAN UNIV OF TECH

Photoelectrochemical photodetector and preparation method thereof

The invention discloses a preparation method of a novel photoelectrochemical photodetector, and the method is characterized by comprising the steps: selecting gallium nitride-based compound semiconductor material components according to the wavelength of light to be detected of the photodetector; forming a gallium nitride-based nanowire on the surface of the substrate according to the components; uniformly modifying cocatalyst nanoparticles on the gallium nitride-based nanowire; packaging the gallium nitride-based nanowire with the modified cocatalyst nanoparticles to obtain the photoelectrode; and preparing the photoelectrochemical photodetector by using the photoelectrode. The photodetector applied to different optical detection scenes can be produced only by adjusting the component content in the nanowire in the growth process of the nanowire. Finally, the novel full-wave band photoelectrochemical photodetector which is high in responsivity, rapid in reaction, economical, environment-friendly and self-energized is prepared by adopting the same technological process. According to the invention, the gallium nitride-based nanowire is creatively applied to the research of the photoelectrochemical photodetector, and the method has very important significance.
Owner:UNIV OF SCI & TECH OF CHINA

Preparation method and application of a metal-organic framework core-shell porous nickel sulfide electrode material

The invention discloses a preparation method and application of a metal-organic framework core-shell porous nickel sulfide electrode material, belonging to the field of metal-organic framework core-shell material preparation methods. The soluble nickel salt of the present invention is dissolved in anhydrous methanol, after stirring evenly, a certain quality of trimesic acid is added, after stirring, it is added into a high-pressure reaction kettle, after the reaction kettle is placed in an oven and heated for a certain period of time, it is naturally cooled to room temperature, After drying, the spherical nickel metal organic framework material was ultrasonically dispersed in absolute ethanol, and then slowly added sodium sulfide aqueous solution was placed in an oven and heated for a certain period of time, then naturally cooled to room temperature, and the obtained mixture was centrifuged with anhydrous methanol and deionized water After cleaning for three times, the powder obtained after vacuum drying was placed in a tube furnace and calcined for a certain period of time to obtain the metal-organic framework-based core-shell porous nickel sulfide electrode material. In the present invention, trimesic acid is used as an organic ligand to form Ni-MOF, and the pore diameter and porosity are controllable, which helps to obtain good cycle performance.
Owner:HARBIN UNIV OF SCI & TECH

Manganese-based ternary integrated difunctional oxygen electrode and preparation method and application thereof

The invention discloses a manganese-based ternary integrated difunctional oxygen electrode as well as a preparation method and application thereof. The chemical composition of the bifunctional oxygen electrode is NiCo2O4 / MnO2 / C (at) Ni-Foam, and the bifunctional oxygen electrode is an integrated electrode which is of a kaleidoscope-shaped structure and is loaded with Co and Ni bimetal oxides and is formed by taking foamed nickel as a substrate, taking a MnO2 nanotube and a carbon nanotube as frameworks and taking cobalt salt and nickel salt as metal oxide sources through hydrothermal reaction self-assembly. Firstly, MnO2 tubular crystals are prepared through hydrothermal reaction, loading of an active carrier is facilitated, meanwhile, the difunctional oxygen electrode of a kaleidoscope-shaped structure is prepared by optimizing hydrothermal reaction conditions, the surface of the difunctional oxygen electrode is provided with a rich layered structure, a unique microstructure provides rich active sites, the difunctional oxygen electrode has good stability, and the difunctional oxygen electrode can be applied to the field of biochemistry. And when the composite material is used in the zinc-air battery, the composite material has good zinc-air battery charging and discharging performance.
Owner:DONGHUA UNIV +1

A kind of three-dimensional layered niznal semiconductor multi-metal oxide composite material and its preparation method and application

The invention discloses a three-dimensional laminar NiZnAl semiconductor polyoxometalate composite material and a preparation method and applications thereof, relating to a semiconductor polyoxometalate composite material and a preparation method and applications thereof, and aiming at solving the problems that the existing NOx sensor is low in sensitivity, poor in selectivity and high in cost at room temperature. The composite material is prepared from nickel nitrate, aluminium nitrate, zinc nitrate, surfactant and precipitator. The preparation method comprises the following steps: I. preparing a combined solution of nickel nitrate, aluminium nitrate, zinc nitrate, surfactant and precipitator; II. performing water bath heating; III. filtering, washing and drying the obtained precipitate to obtain a precursor; and IV. calcinating the precursor. The composite material is applied to preparation of a gas-sensitive element as a sensitive material. The composite material has protruding selectivity, adsorption reversibility and high sensitivity. The three-dimensional laminar NiZnAl semiconductor polyoxometalate composite material is applicable to preparation and application of a semiconductor polyoxometalate composite material.
Owner:HEILONGJIANG UNIV

Preparation of al-ti-ni crystal-amorphous composite material with aluminum-based alloy and its preparation method and application

The invention provides an Al-Ti-Ni crystal-amorphous composite material prepared from an aluminum-based alloy and its preparation method and application. The Al-Ti-Ni original alloy is prepared according to the following atomic percentage content: the content of Al is 70-90%, and the content of Ti is 70-90%. The content of Al-Ti-Ni is 1-20%, and the content of Ni is 1-25%. The Al-Ti-Ni alloy is cut into a strip with a thickness of 8-32μm, a width of 1-3mm, and a length of 1-3cm; the strip is in After ultrasonication in absolute ethanol for 3‑8min, wash with deionized water and dry for later use; place the strip together with potassium hydroxide solution with a molar concentration of 0.6‑1.5M in an electrolytic cell for electrochemical reaction, and the dealloying potential It is ‑0.60‑‑1.00V, and the reaction time is 3500‑7500s. After the reaction is completed, the sample prepared after washing and drying is the Al‑Ti‑Ni crystal‑amorphous composite material prepared from an aluminum-based alloy, which has high-efficiency electrolysis of water Hydrogen evolution catalytic activity, and low application cost, simple operation, short time-consuming, is an efficient and economical synthesis method.
Owner:梁春永
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