86results about How to "Improve electrochemical catalytic performance" patented technology

The invention belongs to the field of electrochemical materials, and discloses a sulfur and nitrogen codoping graphene loaded vulcanized cobalt and nickel catalytic material and preparation and application. A metal cobalt source, a nickel source and thiourea are dissolved in a solvent, a mixture is subjected to ultrasonic stirring and mixing, later, ammonium hydroxide is added dropwise, a mixtureis stirred and mixed, then, graphene oxide is added, a mixture is subjected to ultrasonic stirring and mixing and then subjected to hydro-thermal treatment, next, centrifugal washing and freeze dryingare carried out, and a graphene loaded vulcanized cobalt and nickel composite material is obtained; and then, in a nitrogen atmosphere, calcination treatment is carried out, graphene oxide is furtherreduced to obtain the sulfur and nitrogen codoping graphene loaded vulcanized cobalt and nickel catalytic material. The synthetic method is simple, the cost is low, the energy consumption is relatively low, environmental friendliness is achieved, and the obtained product has good electrical conductivity and electrochemical catalysis performance and is suitable for actual application of a water cracked cathode and anode catalytic material.

The invention discloses a platinum/silver alloy nano-particle catalyst, a method for preparing the same and application of the platinum/silver alloy nano-particle catalyst. The method includes mixing cetyl trimethyl ammonium bromide aqueous solution, chloroplatinic acid aqueous solution and sodium borohydride ice aqueous solution with one another to obtain seed solution; mixing cetyl trimethyl ammonium bromide aqueous solution, chloroplatinic acid aqueous solution, silver nitrate aqueous solution, hydrochloric acid solution, ascorbic acid aqueous solution and the seed solution with one another to obtain the platinum/silver alloy nano-particle catalyst. The platinum/silver alloy nano-particle catalyst, the method and the application have the advantages that the method is simple, and reaction conditions are mild; the platinum/silver alloy nano-particle catalyst can be in different morphologies along with difference in the proportions of the added chloroplatinic acid aqueous solution to the added silver nitrate aqueous solution and have large specific surface areas; working electrodes further can be made from the platinum/silver alloy nano-particle catalyst, alcohol solution can be catalytically oxidized by the aid of electrochemical processes, and the alcohol catalytic oxidation activity of the platinum/silver alloy nano-particle catalyst is superior to the alcohol catalytic oxidation activity of commercial Pt/C catalysts.

The invention relates to a low-temperature environmentally-friendly preparation method of nitrogen edge doped graphene, and belongs to the field of novel carbon nano-materials. The preparation method is characterized in that graphite powder and a nitrogen-containing polymer solid are mixed and subjected to continuous ball milling at a certain ball milling speed under the normal temperature and normal pressure so as to obtain a nitrogen edge doped graphene nanosheet, wherein no liquid agents are added during preparation. By analyzing through a scanning electron microscope and an atomic force microscope, the product is a lamellar structure which is uniform in dispersion and less than 1 nanometer in thickness. The analysis result of an X-ray photoelectron spectroscopy shows that the prepared product contains nitrogen, carbon, oxygen and other elements, and therefore, that the nitrogen edge doped graphene nanosheet is successfully prepared can be verified.

The invention discloses a modified manganese dioxide catalyst, a modified manganese dioxide catalyst electrode and a preparation method of and the modified manganese dioxide catalyst and the modified manganese dioxide catalyst electrode. The manganese dioxide catalyst is prepared through an impregnation method, and is formed by fluorine ions and metal ions doped nano-manganese oxide is loaded on a metallic oxide carrier with a rutile crystal structure and an oxygen-deficiency structure simultaneously; a corrosion-resistant conductive layer formed by the metallic oxide with the rutile crystal structure and the oxygen-deficiency structure and a modified manganese dioxide catalyst layer formed by the fluorine ions and metal ions doped nano-manganese oxide are sequentially prepared on a conductive base body to prepare the modified manganese dioxide catalyst electrode; the modified manganese dioxide catalyst and the modified manganese dioxide catalyst electrode have the characteristics of high current efficiency and long service life; and besides, the preparation method can be operated simply, the cost is low and the industrial production requirement is met.

The invention discloses a porous platinum/palladium alloy nanoparticle catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing hexadecyl trimethyl ammonium chloride aqueous solution, chloroplatinic acid aqueous solution and sodium borohydride aqueous solution to obtain seed solution, then injecting the seed solution into growth solution prepared from hexadecyl trimethyl ammonium chloride aqueous solution, chloroplatinic acid aqueous solution, chloropalladic acid aqueous solution and ascorbic acid aqueous solution, growing for a period of time, so that nano-porous dendrite platinum palladium alloy nanoparticles with palladium enriched at the center are successfully obtained, then oxidizing for stripping the palladium at the center, so that the porous hollow cherry-shaped platinum/palladium alloy nanoparticle catalyst is obtained. Compared with the prior art, the preparation method is simple, reaction conditions are mild, the preparation method is simple and practicable and is green and pollution-free; the nano catalyst adjustable in dimension and components is obtained through controllable synthesis, and the obtained platinum/palladium alloy nanoparticle catalyst has larger specific surface area and shows excellent electrochemical catalytic performance.

The invention discloses a special electrode for in-vivo voltammetry analysis and a preparation method thereof. The preparation method of the special electrode comprises the following steps: 1) preparing carbon fiber coated with a carbon nanomaterial on surface; 2) preparing a carbon fiber microelectrode; 3) soaking the carbon fiber electrode prepared by the step 2) in solution for ultrasonic washing; and 4) subjecting the carbon fiber electrode prepared by the step 3) to electrochemical pretreatment to obtain the special electrode. Meanwhile, an electrochemical detection device for in vitro correction or in vivo real-time physiological activator monitoring is prepared by using the special electrode. The electrochemical detection device comprises the special electrode for physiological activator monitoring of the invention, a reference electrode and an auxiliary electrode. The electrochemical detection device prepared by using the special electrode of the invention can meet the requirements for the in-vivo voltammetry analysis of physiological activators and has a promising application prospect in researches in fields of neurophysiology, clinical medicine and the like.

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 discloses a functionally-graded anode composite film of solid oxide fuel cells (SOFC) and a preparation method thereof. Three currently known anode materials, Cu-LSCM-CeO2 with excellent catalytic performance, Ni-YSZ with excellent toughness and mechanical strength property and Ni-ScSZ with superior electrochemically activity, are combined, so that a plurality of requirements on the anode can by undertaken by different functional layers, each layer is enabled to cooperate with each other, and an effect of complementary advantages can be achieved through synergy, thereby eliminating carbon deposition phenomena of methane and other hydrocarbon fuels on the anodes of the SOFC, and improving stability of the anodes in the methane and other hydrocarbon fuels and catalytic activities of the anodes for electrochemical reactions. Especially, the method is suitable for preparing large-size, high-performance and functionally-graded anode composite film of the solid oxide fuel cells through industrial production, is simple in technology, short in preparation period, low in cost, and suitable for industrial applications.

The invention provides a method for manufacturing melted carbonate fuel battery negative nickel board with non-water-base flowing process which belongs to fuel battery field. The invention uses carbonyl nickel power material, uses compound rare earth oxide as impurity modifying material, the flow pulp solvent uses the compound solvent of cyclohexanone and n-butanol, manufactures the melted carbonate fuel battery nickel negative electrode biscuit with non-water-base flow process, the biscuit is baked in temperature and air condition, and acquires the multi-aperture negative electrode nickel board. The product has an excellent stability and electrochemical catalyst performance; the specific area of the nickel board is high, the aperture rate is between 60%-80%, the average aperture diameter is between 6-10micrometers; the process is simple, the cost is low.

The invention relates to a preparation method and application of a biosensor built based on gold and copper-multiwalled carbon nanotube-manganese dioxide, and belongs to the technical field of novel function materials and biosensing detection. Based on the gold and copper-multiwalled carbon nanotube-manganese dioxide, the gold and copper-multiwalled carbon nanotube-manganese dioxide has good electrochemical catalysis capacity and electron transfer capacity to hydrogen peroxide, therefore, the sensitivity of the biosensor is apparently improved, and great significance for CA125 detection is achieved.

The invention discloses a preparation method for a boron-doped single-particle-layer nano-diamond film. The method includes the following steps that (1) a hot filament chemical vapor deposition method is adopted for preparing a single-particle-layer nano-diamond film with the thickness being 300-600 nm on a single-crystal silicon substrate; (2) an ion implantation method is adopted, boron ions are injected into the single-particle-layer nano-diamond film obtained in the step (1), and a film with the injected boron ions is obtained; and (3) vacuum annealing is conducted on the film which is obtained in the step (2) and injected with the boron ions, and then the boron-doped single-particle-layer nano-diamond film is obtained. The boron-doped single-particle-layer nano-diamond film prepared through the method has excellent electrochemical performance, especially has good electrochemical catalysis performance, and can be used for electrochemical catalysis oxidation treatment on organic wastewater.

The invention relates to an anti-carbon deposition solid oxide fuel cell anode material and a preparation method thereof. The composition of the anode material is xSr (1-1.5y) My TiO3-(1-x) CeO2. In the formula, x is equal to 0.3-0.7, and y is equal to 0.04-0.4; M is La, Y or Sm. The adulteration amount of La, Sr and Y is respectively 0.2-0.4mol%, 0.1-0.3mol% and 0.02-0.08mol%. Compared with the traditional nickel- yttrium oxide stabilized zirconia anode taking hydrogen as fuel, the anode material can take hydrocarbon having low price and rich reserve volume as fuel, so as to reduce the cost of a solid oxide fuel cell and be beneficial to accelerating the commercial development of the solid oxide fuel cell.

The invention discloses application of CoTPyP porphyran coordination polymer materials. According to the application, CoTPyP porphyran coordination polymers are prepared into a carbon paste electrode; the carbon paste electrode is used as an electrochemical sensor to be applied to nitrite electrocatalysis, wherein the chemical formula of the CoTPyP porphyran coordination polymers is [Co(TPyP)]6 12CH3COOH 12 H2O. The electrocatalysis effect of the electrochemical sensor on nitrite is studied; the result shows that the sensor has better performance; the minimum detection limit is 2.0*10<8>M; the sensitivity is 743.3mA mol<-1> L cm<-2>; the linear range is 2.5*10<-6> to 5.5*10<-4>M, wherein R is 0.993; the surface has the characteristics of high sensitivity, short response time and the like; certain application values are realized in the aspect of electrochemical sensing.

The invention discloses a hydroxyl oxidize iron nano array, and a preparation method and application thereof. The preparation method comprises the following steps: (1) weighing an iron salt and sodiumnitrate, dissolving the iron salt and sodium nitrate in water, and conducting stirring to obtain a uniformly mixed solution; and (2) conducting a hydrothermal reaction on the solution and a stainlesssteel mesh to obtain a stainless steel mesh-supported hydroxyl oxidize iron nano-array. According to the present invention, by loading hydroxyl oxidize iron nanorods to the stainless steel mesh, thesynergic effect of the hydroxyl oxidize iron nanorods and the stainless steel mesh is exerted, and an ordered electrode with excellent water electrolysis catalytic performance and good stability is prepared. The electric conductive property of hydroxyl oxidize iron is further optimized through doping modification, so that the water electrolysis catalytic activity and stability of the electrode areimproved.

The invention belongs to the field of composite nano particles, and discloses a preparation method of a g-C3N4 coated metal nano composite with a core-shell structure. A simple microwave reaction method is adopted, nano level metal powder and urea are grinded together and evenly mixed in a protective atmosphere, microwaves are utilized to heat magnetic nano particles to carry out reactions, after1 to 10 minutes of reactions, the reaction product is rapidly cooled by placing the reaction product in liquid nitrogen in a protective gas, the g-C3N4 coated metal nano particle with a core-shell structure is synthesized, and the g-C3N4 coated metal core-shell nano powder comprises a magnetic metal inner core, which is coated by g-C3N4. The prepared g-C3N4 coated metal core-shell nano powder composite has the advantages of simple preparation technology, uniform product structure, green and environmentally friendly property, and easiness for massive production. The prepared g-C3N4 coated metalcore-shell nano powder has a wide application prospect in fields such as photocatalysis research, electro-catalysis (hydrogen evolution reaction) research, and the like.

The invention discloses a composite cathode of a chromium-pollution-resistant solid oxide fuel battery and a preparation method thereof. The composite cathode comprises an active layer and a collector layer. The active layer is arranged on an electrolyte layer, and the active layer is made of LNF-doped CeO2; and the collector layer is arranged on the active layer and made of LNF. The preparation method comprises the following steps of step1. adhering the pulp which is formed by the preparation material of the active layer onto the electrolyte layer to be dried, and preparing an active layer blank body; step 2. adhering the pulp which is formed by the preparation material of the collector layer onto the active layer blank body, and drying the pulp to obtain the collector layer blank body, and compounding the prepared active layer and the prepared collector layer into a cathode blank body; and step 3. sintering the composite cathode blank body. The composite cathode has excellent electrochemical catalytic performance and chromium pollution resistance; the preparation method has the advantages of simplicity in process, short preparation period and low cost, and the chromium-pollution-resistant solid oxide fuel battery is applicable to the industrialized application.

The invention provides a cobalt-doped tin disulfide nano-sheet array material, a preparation method and applications thereof. Compared with the method in the prior art, the method of the present invention has the following characteristics that in a closed high temperature and high pressure reaction kettle, isopropanol is used as a reaction solvent, a tin source, a sulfur source and a cobalt salt are uniformly mixed according to a certain ratio, and a reaction system is heated to generate a high pressure environment so as to prepare the cobalt-doped tin disulfide nano-sheet array material, wherein the two-dimensional nano-sheet structure increases the surface area of the whole material, and the small particles SnS2 attached to the surface of the nano-sheet can provide more active sites so as to easily transfer and transmit electrons, such that the material has good electrochemical catalytic response and good stability; and carbon fiber as a substrate has good electrical conductivity, can be used directly as a flexible electrode material, and cannot affect an electrode reaction, such that the carbon fiber material is selected as the substrate for hydrothermal synthesis, the two-dimensional structure grows on the surface of the carbon fiber, and the obtained material is directly used for catalyzing oxygen evolution reactions.

The present invention relates to a PCA-based gas detection apparatus and a PCA-based gas detection method, and belongs to the technical field of gas detection. The gas detection apparatus comprises azirconium-based sensor, a data collection and conversion device and a PCA analysis module, wherein the zirconium-based sensor has a single sensitive electrode. According to the present invention, thegas detection apparatus can simultaneously identify a plurality of gases, and has advantages of simple preparation process, small volume, and low cost.

The invention provides a preparation method of a macro graphene modified electrode material, relates to the field of electrode materials for all-vanadium redox flow batteries (VRB), particularly to apreparation method of a graphene modified carbon felt suitable for high-performance and macroscopic production of an all-vanadium redox flow battery, and aims to solve the problems of poor conductivity, low specific surface area, low electrochemical activity, poor vanadium ion couple catalytic performance, low single battery performance, high cost and the like of a commercial carbon felt electrodefor a vanadium battery at the present stage. According to the invention, commercial carbon felt is used as a raw material, and a chemical vapor deposition (CVD) method is used for preparing the graphene modified carbon felt; the composite carbon felt prepared by the invention has the advantages of good conductivity, high specific surface area, good electrochemical catalytic performance, excellentchemical stability, good VRB battery performance, low cost and the like; and the preparation method disclosed by the invention has the advantages of simplicity and feasibility in operation, low product cost, easiness in industrial production, environmental friendliness and the like, and can be widely applied to the field of all-vanadium redox flow batteries.

The invention relates to a method for improving the comprehensive performance of a lead alloy rolling anode. The method is characterized in that the surface of the lead alloy rolling anode is heated to 200-310 DEG C and then is directly water-cooled; and a salt-bath furnace, an oil-bath furnace, high-frequency heating, medium-frequency heating or a protective atmosphere furnace is adopted for surface heating. According to the method, through a rolling-surface thermal treatment manufacture technology, a lead alloy anode with good mechanical performance, electrochemical performance and corrosion-resistance can be obtained. Compared with a rolling anode which is manufactured with a current technology, the rolling anode is advantaged in that the mechanical performance is improved by 12%-25%; the electrochemical performance is improved by 5%-15%; and the corrosion-resistance is improved by 9%-20%. The method is simple in technology and convenient for operation; the good rolling anode mechanical performance of the manufactured rolling anode is maintained, and the electrochemical performance and the corrosion-resistance are further improved; when the method is applied to an electrodeposition procedure of non-ferrous metal metallurgy, a cell voltage during an electrolytic process can be effectively lowered; the service life of the anode is prolonged; pollution to cathode products is reduced; and the method is applicable to industrial application.