63results about How to "Improve electrocatalytic efficiency" patented technology

The invention relates to a method with low cost and simple preparation process for doping nano-Ag particles in TiO2 nanotubes. The method can realize that nanoparticles can be evenly distributed and the electrocatalysis efficiency of TiO2 nanotubes can be increased. The method comprises the following steps: firstly utilizing a two-electrode system to prepare TiO2 nanotubes, secondly placing the prepared titanium alloy or pure titanium with TiO2 nanotubes in silver nitrate solution to deposit, performing an electrocatalysis experiment in basic ethanol solution to obtain TiO2 nanotubes doped with nano-Ag particles. The current densities of the oxidation peak and reduction peak of the obtained TiO2 nanotubes are separately up to 1mA/cm<2> and 3.2mA/cm<2> and the TiO2 nanotubes has higher electrocatalysis efficiency.

The invention discloses a preparation method of a nitrogen-doped porous carbon nano sheet composite material. The preparation method comprises the steps of performing high-temperature carbonization treatment on a mixture which consists of melamine and adjacent phenanthroline iron and serves as a precursor in a tubular furnace under an inert gas environment, and then removing dissolved iron compounds from an acidic solution to obtain a porous carbon nano sheet layer with carbon-coated iron carbide nano particles. The preparation method has the advantages that the technology is simple, the raw materials are cheap, and operation is easy to implement; in the prepared composite material, iron carbide is uniformly dispersed in the carbon nano sheet layer, so that the composite material is high in specific surface area and pore volume; iron carbide nano particles are completely coated by graphitized carbon, so that oxidization and corrosion are hardly caused; the composite material is stable in acidic electrolyte, and the battery activity can be effectively improved; when used as an electrocatalyst, the composite material is relatively high in electrocatalysis efficiency; the preparation method has an important value and significance in the field of preparation of doped carbon nano composite materials and electrocatalysis of proton membrane fuel batteries.

The invention discloses an antimony-doped tin oxide-carbon nanotube compounded adsorptive electrode and a preparation method thereof.The antimony-doped tin oxide-carbon nanotube compounded adsorptive electrode consists of a titanium dioxide nanotube array substrate, an antimony-doped tin oxide intermediate layer and an antimony-doped tin oxide compound carbon nanotube active layer.A titanium-based titanium dioxide nanotube array is firstly prepared by adopting an anodic oxidation method to serve as a substrate material, the antimony-doped tin oxide intermediate layer is prepared by adopting a sol-gel method, and finally the carbon nanotube compounded antimony /tin oxide active layer is prepared by adopting a pulse electrodeposition method, and the antimony-doped tin oxide-carbon nanotube compounded adsorptive electrode is obtained.By utilizing the high specific surface area of carbon nanotubes and introducing an antimony/tin dioxide composite material, the electric catalysis efficiency of the electrode is greatly improved, so that the electrode has the synergic effect of electric catalysis-adsorption.In addition, tin-antimony and antimony-tin intermediate layer doped in the carbon nanotubes form a eutectoid, the service life of the electrode is prolonged, and the electrode has a great application value in the field of electrochemical catalysis.

The invention discloses a particle electrode catalyst filling material for three-dimensional electrodes, and a preparation method thereof. The particle electrode catalyst filling material comprises alumina particle electrodes and graphene-modified stannic oxide coated on the alumina particle electrodes. The preparation method of the particle electrode catalyst filling material comprises the following steps of 1) carrying out a pretreatment on alumina particle electrodes, 2) preparing graphene-stannic chloride sol, and 3) mixing the pretreated alumina particle electrodes and the graphene-stannic chloride sol, stirring uniformly the mixture by a constant temperature magnetic heating stirrer, standing, aging, then carrying out a centrifugal separation process, drying and calcining to obtain a particle electrode catalyst filling material for three-dimensional electrodes. The preparation method has the advantages of simple process, low preparation cost, and easy popularization and application. The particle electrode catalyst filling material prepared through the preparation method has the advantages of stable property, high electrocatalysis efficiency and difficult stratification.

The invention discloses a method for preparing a three-dimensional ordered porous lead dioxide membrane electrode by a template electro-deposition method. The method comprises the steps of preparing an antimony-doped tin dioxide intermediate layer on a porous titanium matrix via a sol-gel method, assembling a polystyrene sphere mono-dispersion serving a template agent to the intermediate layer via natural settlement, then preparing a lead dioxide active layer in the gap of the template agent via an electro-deposition method, and finally dissolving the template agent to obtain the lead dioxide membrane electrode with a porous structure. The lead dioxide membrane electrode has three-dimensional ordered porous structure, large specific surface area, many electrochemical active sites and large filtration flux, overcomes the defects that the traditional lead dioxide electrode has a compact structure and cannot be applied to a filtering electrochemical system, and has great application value in the electrochemical catalysis field.

The invention discloses the preparation and application of iron-cobalt co-doped carbon-nitrogen core-shell microsphere material, which is used for cathodic oxygen reduction reaction electrocatalyst offuel cell. Fe3O4, aniline, cobalt nitrate hexahydrate and 2-methylimidazole are used as raw materials. The preparation method comprises steps that the aniline is polymerized on the Fe3O4 microspheresby in-situ growth to form core-shell microspheres, washed with ethanol and deionized water, and then dried in a vacuum drying oven, and then ZIF-67 is continuously grown on the above microspheres, and the same washing is performed. After washing and drying, the microspheres are placed in a tube furnace for carbonization, followed by carbonization using sulfuric acid as a medium for pickling, andthen washing and drying are continuously carried out. After such a series of treatment, Fe-Co co-doped carbon-nitrogen core-shell microspheres were obtained. As that carbon-nitrogen core-shell microsphere material prepare by the invention is green and environmentally friendly, and has good electrocatalytic performance, the carbon-nitrogen core-shell microsphere material has important value and significance in the field of heteroatom doped carbon-based oxygen reduction electrocatalyst.

The invention provides a preparation method of porous carbon-supported nitrogen-containing bimetallic catalyst and application of the porous carbon-supported nitrogen-containing bimetallic catalyst inthe aspect of electrochemical reduction of nitrate in water. The preparation method of the catalyst comprises the following steps: sequentially adding copper nitrate trihydrate, triethylene diamine,a terephthalic acid solution and a precursor solution containing noble metal Pd or Pt into DMF; then dispersing the porous carbon carrier in the mixed solution and moving to a hydrothermal kettle forheating reaction to obtain a solid material; roasting the obtained solid material to obtain a porous carbon-supported nitrogen-containing bimetallic catalyst; the catalyst is coated on an electrode sheet to prepare a working electrode module, and the nitrate in water is reduced by electrocatalysis. The nitrogen-containing bimetallic catalyst obtained by the preparation method of porous carbon-supported nitrogen-containing bimetallic catalyst and electrochemical application thereof has high activity and high nitrogen selectivity for the electrochemical reduction of nitrate, and has higher removal efficiency under the condition that the pH value of a water body is neutral; the porous carbon carrier plays a role of dispersing active components and shows good stability.

The invention discloses a papermaking wastewater treatment method. The method comprises the steps of filtration, gas washing, pH adjustment, flocculating precipitation, decoloring, advanced oxidation and plasma disinfection. The method disclosed in the invention has substantially higher pollutant removal ability than the prior art; and ultraviolet light is introduced into a three dimensional electrode/electro-Fenton reaction system, and an anode plate with an ultraviolet photocatalysis performance and a particle electrode are adopted to substitute traditional electrodes, so the photoelectro-synergistic catalysis reaction of the three dimensional electrode/electro-Fenton reaction system is carried out by using ultraviolet light, the energy consumption of the three dimensional electrode/electro-Fenton reaction system is reduced, a synergistic catalytic oxidation effect is generated, and organic pollutions are efficiently and rapidly degraded. Fire coal flue gas waste is used to purify the papermaking wastewater, the acidic gas SO2 in the flue gas is used to neutralize in order to remove alkaline substances in the wastewater, and flue dust particles in the flue gas are used to remove short fibers and other suspension in the wastewater in order to realize treatment of wastes by using other wastes. Organic matters and other pollutants contained in water are effectively removed through a plasma discharge technology.

The invention belongs to the technical field of new energy materials, and particularly relates to a novel bifunctional electrochemical efficient catalyst, in particular to a metal organic framework (MOF) array constructed by introducing ferrous ions and a preparation method thereof. The preparation method comprises the following steps: (1) putting nickel foam (NF) into a hydrochloric acid solutionto remove impurities such as nickel oxide on the surface, improving the adhesive force of reactants on the surface of nickel foam, taking out, washing, and drying water on the surface to obtain an activated nickel foam carrier; and (2) weighing iron salt according to a certain molar weight, taking a certain amount of ligand, dissolving iron salt and the ligand in a solvent, immersing the nickel foam carrier obtained in the step (1) into the solution, and carrying out a solvothermal reaction to obtain the iron-based metal organic framework composite material with a columnar structure. The prepared novel bifunctional electrochemical catalyst has a large current effect and super-stability under a high current density, and thus the novel bifunctional electrochemical catalyst has a more excellent electrochemical catalytic performance and higher stability.

The invention belongs to the technical field of electrocatalytic electrode preparation, and particularly relates to a three-dimensional ordered porous ruthenium dioxide membrane electrode and a preparation method thereof. The membrane electrode comprises a porous titanium matrix and a three-dimensional ordered ruthenium dioxide active surface layer, wherein the three-dimensional ordered rutheniumdioxide active surface layer has a communicated structure formed by three-dimensional ordered spherical piling, and a porous channel for liquid flowing is formed among the piled spheres. According tothe ruthenium dioxide membrane electrode, emulsion containing polystyrene microspheres is dripped to the surface of a titanium plate, hydrate ruthenium dioxide grows in gaps in a template by an electrodeposition method, and the template is removed through high-temperature sintering and is dehydrated to obtain the three-dimensional ordered porous ruthenium dioxide membrane electrode. The electrodecan overcome the defect that a traditional ruthenium dioxide electrode has a compact structure, the utilization rate of ruthenium dioxide is not high and ruthenium dioxide cannot applied to a filter type electrochemical oxidation system, the contact area, mass transfer efficiency and filtration flux can be greatly improved, and meanwhile, the preparation cost and operation energy consumption can be reduced.

The invention discloses a soybean biological base fuel cell oxygen reduction catalyst and a preparation thereof. The preparation method comprises the following steps of 1) preparing graphene oxide; 2)taking graphene oxide as a carrier and taking soybean as a carbon source, performing carbonization treatment through a hydrothermal method to obtain a precursor; and 3) performing pyrolysis and reduction on the precursor in an ammonia gas atmosphere to obtain the soybean biological base fuel cell oxygen reduction catalyst. The soybean biological base fuel cell oxygen reduction catalyst is used for catalyzing an oxygen reduction reaction of a fuel cell. The soybean biological base fuel cell oxygen reduction catalyst is prepared through a simple method by taking low-cost natural biomass soybeanas the raw material and by taking graphene as the carrier for performing pyrolysis and reduction in the ammonia gas atmosphere at a temperature of 800 DEG C. The catalyst is excellent in oxygen reduction performance and can be widely applied to the fuel cell.

The invention discloses a method for synergistically degrading organic dye wastewater by a graphene electrode and a photoelectric Feton. Firstly, graphite and variable-valence metal oxides are mixed, and emulsifiers, absolute ethanol and polytetrafluoroethylene are sequentially added thereto, and ultrasonic action makes it Disperse evenly until it is mixed to form a cohesive paste; then roll the obtained paste into a film, attach it to a nickel mesh, press it into an electrode under a certain pressure, and remove the residue on the electrode surface; the soaked electrode The graphite composite electrode is placed in an infrared box and dried to obtain a graphite composite electrode; the graphite composite electrode is used as a cathode, and the iron sheet is used as an anode, and the lighting device is turned on to irradiate the electrolytic cell with sunlight to degrade the organic dye wastewater. The invention adds sunlight to the electro-Fenton reaction to form a photo-electric Fenton system, which is applied to the dye wastewater treatment practice, and the method improves the degradation ability of the dye wastewater.

A disc type electrocatalytic water treatment device, characterized in that: comprising: a housing having a water inlet and a water outlet, a plurality of cathode plates and anode plates sequentially and alternately stacked inside the housing, a central shaft passes through central holes of the cathode plates and anode plates and compress the cathode plates to form a disc-shaped structure while the cathode plate and the anode plate are separated at the central holes. A wastewater to be treated is guided to enter from the water inlet, flow inwardly and outwardly to sequentially pass through the cathode plate and the anode plate such that a passage route is formed, and finally flows out from the water outlet.

The invention discloses a titanium dioxide nanotube composite material and a method for depositing SnSe nanoparticles. The method comprises the following steps of: preparing titanium dioxide nanotubes by using a two-electrode system; and electrochemically depositing the SnSe nanoparticles on a titanium alloy or pure titanium with the TiO2 nanotubes. By the method, the defects of the prior art are overcome, high electro-catalytic efficiency is achieved, and the nanoparticles uniformly distributed on surfaces and having controllable size are obtained; and the whole process has the characteristics of low cost, simple preparation process.

The invention belongs to the technical field of electrodes, and particularly relates to a preparation method of a MOFs polymer compound electrode material and the compound electrode material and a usemethod thereof. The preparation method of the compound electrode material is suitable for loading a MOFs polymer compound to an electrode surface by means of surface loading, and the catalytic oxidation performance of the compound electrode material is improved.

The invention relates to a cobalt oxide nanosheet chlorine evolution electrode, a preparation method and application thereof. The cobalt oxide nanosheet chlorine evolution electrode comprises a titanium substrate and cobalt oxide nanosheets grown on the titanium substrate, the chemical formula of cobalt oxide is Co3O4, the crystal structure of cobalt oxide is a cubic phase, cobalt oxide grows on the titanium substrate, and adjacent nanosheets are connected in a penetrating manner. And the thickness of the cobalt oxide nanosheets is 20-30nm. The preparation method comprises the following steps of: mixing a metal titanium mesh with a cobalt salt solution to carry out electro-deposition reaction, and depositing cobalt hydroxide (Co(OH)2/Ti) on the surface of the titanium mesh; and then calcining the Co(OH)2/Ti to obtain the Co3O4/Ti electrode. The electrode has excellent electro-catalysis efficiency and has a good application prospect in the field of hydrogen evolution.

The invention discloses an internal circulation type electrocatalytic oxidation reactor and a sewage purification treatment method, the internal circulation type electrocatalytic oxidation reactor comprises at least one circulation device, the circulation device comprises a reaction cabin, the reaction cabin comprises an inner reaction chamber surrounded by an inner shell and an outer reaction chamber surrounded by an outer shell, an inner electrode plate is arranged inside the inner reaction chamber, the inner reaction chamber is embedded in the outer reaction chamber, a packing layer is arranged between the inner reaction chamber and the outer reaction chamber; the inner electrode plate and the outer shell are used as a negative pole, and the inner shell is used as a positive pole. A first electrocatalytic reaction zone is formed between the electrified inner electrode plate and the electrified inner shell, and a second electrocatalytic reaction zone is formed between the electrifiedouter shell and the electrified inner shell. By use of the characteristics of effective ring opening and breaking of a three-dimensional electrode and high energy efficiency of a two-dimensional electrode, pollutants are jointly degraded, electrocatalytic efficiency is high; the sewage purification treatment method realizes multiple stages and multiple cycles of outer circulating purification ofsewage in the circulation device to ensure the discharged water is up to standard.

The invention provides a preparation method of a direct alcohol fuel cell anode catalytic material and relates to catalytic material preparation methods. The method comprises the following steps of selecting a Si(100) single crystal wafer as a base body, drying the Si(100) single crystal wafer, and putting the Si(100) single crystal wafer into a vacuum chamber for depositing a film; selecting Cu<60>Zr<34>Ti<x>Ni<6-x>(x=1,2,3,4 and 5) as a target material, wherein the bottom of the target material is smooth, is in good contact with a target position and can guarantee maximum heat dissipation; selecting a magnetron sputtering coating system as a film deposition device, allowing the target material Cu<60>Zr<34>Ti<x>Ni<6-x> to be aligned with the Si base body located at the center above, vacuumizing the vacuum chamber to 3*10<-4> Pa before film deposition and then introducing high-purity argon to obtain a Cu<60>Zr<34>Ti<x>Ni<6-x> amorphous alloy film. The preparation method is used for preparing the high-electrocatalytic-property, high-stability and low-cost through magnetron sputtering deposition. Through the magnetron sputtering coating system, the precision and the working efficiency are both improved, and the preparation method provides the possibility for continuous operation of a production line.