61results about How to "High redox activity" patented technology

The invention relates to a preparation method of Ni (OH) 2/multilayer graphene composite material. The lamellar Ni (OH) 2 has large specific capacitance, but its conductivity is poor. If it is used asthe electrode material of supercapacitor alone, it will cause the internal resistance of the electrode to be large, the rate performance and cycle performance to be poor and so on. The invention provides a preparation method of a simple Ni (OH) 2/multilayer graphene composite material, wherein in the graphene/metal hydroxide composite material, the excellent cycle stability of the graphene and the high capacity of the metal hydroxide are greatly improved. The supercapacitor with high performance is obtained when the composite material is used as electrode material of supercapacitor.

The invention belongs to the technical field of preparation of catalyst for oxidization of ammonia and relates to a catalyst for selective catalytic oxidization of ammonia into pollution-free N2 and water and a preparation method thereof. The method is characterized in that: adding CeOx serving as an assistant into TiO2 solid powder by an impregnation process; and loading Cu serving as an active component of the catalyst by using urine as a precipitator and by using a homogeneous precipitation process, wherein the molar ratio of Ce to Ti in the catalyst is 1/50 to 1/5, and based on the weightof the catalyst, the weight content of Cu serving as the active component of the catalyst is 1 to 30 percent. The Cu/CeOx-TiO2 composite catalyst disclosed by the invention has high low-temperature activity and high N2 selectivity, can completely convert ammonia at 250 DEG C, has a N2 selectivity of up to 95 percent, and can effectively solve the problem of discharging ammonia-containing waste gases in plants.

The invention belongs to the technical field of preparation of functional composite electrodes and discloses a bisphenol A electro-polymerized film functional carbon nanotube/cadmium sulfide composite electrode as well as a preparation method and application thereof. The bisphenol A electro-polymerized film functional carbon nanotube/cadmium sulfide composite electrode is prepared by taking a single-walled carbon nanotube/cadmium sulfide electrode as a photo-anode, a titanium electrode as a counter electrode and a saturated calomel electrode as a reference electrode, and electro-polymerizing bisphenol A on the carbon nanotube/cadmium sulfide composite electrode under visible radiation through applying a continuous differential pulse voltammetry. The preparation method has the advantages of simplicity and convenience for operation, high controllability, low cost, environment protection and the like, and the prepared electrode has good oxidation-reduction activity, cooperatively enhanced light sensitivity and photosensitive conductivity.

The invention discloses a preparation method of a prism copper oxide-zinc oxide catalyst. The preparation method of the prism copper oxide-zinc oxide catalyst comprises the following steps of dissolving zinc acetate dehydrate into absolute ethyl alcohol, then uniformly mixing the dissolved zinc acetate dehydrate with hexamethylenetetramine aqueous solution, then adding in polyethylpyrrolidone K-30, performing ultrasonic treatment for hydrothermal reaction to prepare prism zinc oxide carrier powder; adding the prism zinc oxide carrier powder into deionized water for ultrasonic dispersion, thendropwise stirring in copper nitrate solution and PH buffer solution with the pH kept to be 8.0-9.0, then ageing the mixture at room temperature, performing centrifugal separation and washing the mixture to be neutral, and drying and calcining the mixture to obtain the prism copper oxide-zinc oxide catalyst. The prepared prism copper oxide-zinc oxide catalyst has selectively exposed crystal surfaces and has the advantages of being orderly in morphology, good in product dispersion and high in redox activity, thereby significantly improving the hydrogen production performance during water-gas shift.

The invention relates to the technical field of chemical materials. The invention discloses a preparation method of a platinum-based ordered alloy, and particularly discloses a preparation method of asub-nano platinum-based ordered alloy. The preparation method comprises the following steps: ultrasonically dispersing multiwalled carbon nanotubes and a nitrogen source into a hydrochloric acid solution to obtain a mixed solution, adding a non-noble metal precursor solution into the mixed solution, adding an initiator in the stirring process, drying, and calcining in an inert gas atmosphere to obtain non-noble metal nitrogen-carbon single atoms; ultrasonically dispersing non-noble metal nitrogen-carbon single atoms in a hydrochloric acid solution, adding a platinum precursor, stirring for 10-14 hours, and drying to obtain an alloy precursor; and pyrolyzing the alloy precursor in a hydrogen atmosphere to obtain the sub-nano platinum-based alloy redox catalyst. In the patent, non-noble metal single atoms and a carbon-nitrogen layer on the surface are used for limiting the range, and the non-noble metal single atoms have high stability and dispersity, so that aggregation, migration andgrowth of Pt particles can be well avoided, and the Pt alloy with small particles and uniform dispersion is obtained.

The invention discloses a Zr-Cu-based amorphous alloy compound electrode material and a preparation method thereof. The material comprises an amorphous core at the middle, nano-porous copper layers ontwo sides of the core and nickel hydroxide particles on the copper layers. The amorphous core is made from copper-zirconium alloy; the widths of the tough belts and hole diameters of the nano-porouscopper layers are 50-100nm, and the thicknesses of the nano-porous copper layers are about 2-3 microns; the sizes of the deposited nickel hydroxide particles are about 200-400nm, and the loading capacities of the same are 0.3-1.0mg/cm<2>. The copper-zirconium alloy comprises 30-70% of Zr and 70-30% of Cu. According to the Zr-Cu-based amorphous alloy compound electrode material and preparation method thereof provided by the invention, the electrochemical deposition condition can be adjusted through adjusting the voltage, time, electrolyte concentration and the like of electrochemical deposition, the deposition time is relatively short, heating is not needed, and the process is visible; and the prepared compound material can be directly applied to the electrode material of the supercapacitor.

The invention provides an ultrahigh specific capacity mesoporous Co3O4 nanosheet electrode material and a preparation method thereof. The preparation method comprises the following steps that 1) foam nickel is adopted to act as the three-electrode system of a working electrode, the mixed aqueous solution of Co(NO3)2 and KCl acts as an electrolyte solution, and a Co(OH)2 nanosheet is deposited on the surface of foam nickel through constant current so that a Co(OH)2 nanosheet precursor is acquired; and 2) the Co(OH)2 nanosheet precursor acquired in the step 1) is cleaned and dried, and then high temperature annealing is performed at temperature of 350-450 DEG C so that the mesoporous Co3O4 nanosheet electrode material is acquired. According to the preparation method of the ultrahigh specific capacity mesoporous Co3O4 nanosheet electrode material, the preparation method has the characteristics of being simple in technology, green and environment-friendly and low in cost, and the acquired Co3O4 nanosheet electrode material has relatively high specific capacity.

Provided is an electronic device, such as a flash memory device and/or a write-once-read-once memory device, where the device has a polyoxometallate that is capable of providing and/or accepting one or more electrons. The polyoxometallate may have a Wells-Dawson structure and the polyoxometallate may comprise a cage and optionally one or more guests. Also provided is a method of using the memory device, the method comprising the step of providing to or accepting from the polyoxometalate one or more electrons to provide a polyoxometalate in a reduced or oxidised state.

The invention provides a carbon nanotube/polyaniline composite material, a preparation method and application, and relates to the technical field of corrosion prevention of metal materials. The preparation method comprises the following steps of dispersing carbon nanotube, aniline and emulsifier into deionized water under the ultrasonic condition; adjusting the pH (potential of hydrogen) value of a mixing system, adding ammonium persulfate, and performing in-situ oxidizing and polymerizing; washing a solid-phase product by ethyl alcohol and the deionized water, drying and grinding, so as to obtain the carbon nanotube/polyaniline composite material. The prepared carbon nanotube/polyaniline composite material has the advantages that a dendritic crystal core-shell structure is formed, and the excellent electrochemical corrosion function is realized in a wide pH range; the carbon nanotube/polyaniline composite material is used as anti-corrosive filler, and has good dispersing property in the epoxy modified acrylate resin.

The invention relates to a preparation method of a three-dimensional cubic CeO2/Mn2O3 composite photo-thermal catalyst. The preparation method comprises the following steps: preparing a mesoporous CeO2 nano cuboid; adding the mesoporous CeO2 nano cuboid, manganous chloride tetrahydrate and urea into water, and heating in a water bath to obtain a catalyst precursor; and calcining the catalyst precursor to obtain the three-dimensional cubic CeO2/Mn2O3 composite photo-thermal catalyst. The three-dimensional cubic CeO2/Mn2O3 composite photo-thermal catalyst prepared by the preparation method is applied to photo-thermal catalytic degradation of VOCs. The preparation method has the beneficial effects that the raw materials for preparing the three-dimensional cubic CeO2/Mn2O3 composite photo-thermal catalyst are wide in source and easy to obtain; the volume or mass of each reactant is determined according to a reasonable ratio, so that the purity of the prepared product can be improved, and the photo-thermal catalytic degradation activity can be improved; the method has the advantages of simple operation, safety, low cost and the like.

The invention discloses a conjugated organic lithium ion battery electrode material and a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. Firstly, a compound 1 is subjected to acid hydrolysis to synthesize a compound 2, the compound 2 reacts with TFA, NaNO2, NaHCO3 and NaOH and then reacts with HCl to obtain H6-HAT, excessive lithium hydroxide is added for a reaction, and finally the derivative Li6-HAT of 1, 4, 5, 8, 9, 12-hexaazabenzophenanthrene (HAT) is obtained. When the conjugated organic electrode material Li6-HAT is used for a lithium ion battery electrode, the first specific discharge capacity reaches 1126mAh/g under the current density of 0.01 V-3V and 100mA/g; and the discharge capacity is 588.0 mAh/g after 50 cycles. The synthesized conjugated organic electrode material is novel and stable in structure and is a novel lithium ion battery electrode material.

The invention discloses a composite carbon-based counter electrode for a dye-sensitized solar cell and a preparation method thereof, and belongs to the technical field of a solar cell. A graphite carbon layer and a carbon nano-particle layer are formed in sequence on the surface of a conductive substrate; and the graphite carbon layer and the carbon nano-particle layer are combined to form a three-dimensional structure composite carbon-based counter electrode. The composite carbon-based counter electrode has higher redox activity; and when the composite carbon-based counter electrode is applied to the solar cell industry, material cost and preparation cost of the dye-sensitized solar cell can be reduced, and meanwhile, photoelectric conversion efficiency of an existing commercial platinumelectrode is realized. Compared with an existing carbon-based counter electrode, the preparation method has the advantages of low raw material, low energy consumption, short preparation period and being green and environmentally friendly, and solves the problem of poor adhesive force between a catalyst layer obtained through a conventional candle burning method and the conductive substrate and thesensitiveness problem of carbon-based flammable flame baking process parameters, thereby improving repeatability and consistency of the preparation process and facilitating large-scale preparation ofthe counter electrode.

The invention provides a lithium titanate composite negative electrode plate and a preparation method thereof. The lithium titanate composite negative electrode plate comprises a negative current collector, a graphene/polyaniline layer and a lithium titanate layer, wherein the graphene/polyaniline layer and the lithium titanate layer coat the surface of the negative current collector; the graphene/polyaniline layer is located between the lithium titanate layer and the negative current collector; and the preparation method of the lithium titanate composite negative electrode plate comprises thesteps of firstly coating the surface of the negative current collector with slurry E containing graphene and aniline, drying and then forming a substrate comprising the graphene/polyaniline layer; and coating the surface of the substrate with slurry F containing lithium titanate, drying and then forming the negative electrode plate comprising the lithium titanate layer and the graphene/polyaniline layer.