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

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.

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.

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.

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.

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.

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.

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.

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.

The invention discloses a preparation method of Au-loaded ZnO microspheres and application thereof in aniline sensing, wherein the Au-loaded ZnO microspheres are composed of Au nanoparticles and a ZnO substrate material, and the Au nanoparticles uniformly grow on the surface of ZnO through a photodeposition method. The preparation method comprises the following steps: ultrasonically dispersing a zinc salt and a surfactant into a mixed solution of deionized water and low-carbon alcohol to form a uniform dispersion system; adding a precipitator, and further stirring the mixture at room temperature to obtain turbid liquid; transferring the obtained turbid liquid into a high-pressure reaction kettle, and obtaining a ZnO precursor through a thermal solvent method; and further, calcining the ZnO precursor to obtain the ZnO microspheres; finally, depositing the Au nanoparticles on the surfaces of the ZnO microspheres through photodeposition. The ZnO microspheres have high-sensitivity response to aniline gas in a room-temperature working environment, and the sensitivity of the ZnO microspheres to 100 ppm aniline reaches 36.3.

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.

The invention provides a fuel cell electrode and a preparation method and application thereof. The fuel cell electrode is formed by composite nanofibers containing a catalyst, and the material of the composite nanofibers comprises a mixture of a nanofiber catalyst, a polymer electrolyte membrane material and a binder. The fuel cell electrode catalyst can be uniformly dispersed, a three-phase reaction interface is optimized, and the utilization rate and the output power of the catalyst are improved. According to the preparation method of the fuel cell electrode, the preparation process is effectively simplified, the process controllability is high, the production efficiency is improved, and the electrochemical stability of the prepared fuel cell electrode is ensured. The fuel cell comprising the fuel cell electrode is high in catalytic efficiency, relatively lower in economic cost and high in power density.