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793results about "Electrode shape/forms" patented technology

Preparation method for NiCoP nanowire electro-catalytic electrode

The invention discloses a preparation method for a NiCoP nanowire electro-catalytic electrode. A NiCo salt nanowire is adopted as a phosphorization precursor, hypophosphite is used as a phosphorus source, and the phosphorization process of the NiCo salt nanowire is achieved by controlling the annealing technique in a stored program control tube type annealing furnace. The diameter of the NiCoP nanowire obtained through the method is 140 nanometers, the length of the obtained NiCoP nanowire is about 3.2 micrometers, and the surface of the nanowire is roughly and evenly grown on a 3D netty foamed nickel substrate, so that the specific surface area and the electric conductivity of an electro-catalytic material are effectively improved, and the electro-catalytic hydrogen evolution performance and stability of an electrode material are improved. The electro-catalytic hydrogen production performance of the electrode is tested in 1M of a KOH electrolyte, the overpotential under the electric current density of 10 mA/cm<2> is 109 mV, and the Tafel slope is 88.5 mV/dec, so that the material has the superior electro-catalytic hydrogen production performance compared with common electro-catalytic hydrogen evolution materials. Meanwhile, the preparation technique is simple, the equipment requirement is conventional, reactive materials are abundant, price is low, and the electrode is environmentally friendly.
Owner:HUBEI UNIV

Nickel-iron hydrotalcite based electro-catalytic oxygen evolution electrode and preparation and application thereof

The invention belongs to the technical fields of material sciences and electro-catalytic hydrogen production, and particularly relates to a nickel-iron hydrotalcite based electro-catalytic oxygen evolution electrode and preparation thereof, wherein the nickel-iron hydrotalcite based electro-catalytic oxygen evolution electrode can be used in an electrolytic water oxygen evolution reaction in an alkaline medium. An electrode system takes a nickel-iron hydrotalcite structure as a catalytic activity center and takes nickel foam as an electrode material; in the alkaline medium, the nickel-iron hydrotalcite based electro-catalytic oxygen evolution electrode can efficiently electrolyze water to prepare oxygen, the overall overcurrent polishing of electrolytic water is reduced greatly, and good stability is showed; according to the preparation technology of the nickel-iron hydrotalcite based electro-catalytic oxygen evolution electrode, a nickel-iron hydrotalcite composite structure is grownon the nickel foam base through an in-situ electrodeposition method; and the resources of required raw materials are wide, the price is low, the technology is mature and stable, operation is easy, convenient and fast, controllability is high, the process does not produce poison, and the nickel-iron hydrotalcite based electro-catalytic oxygen evolution electrode is suitable for mass production andthe industrial electrolytic water reaction.
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI

Method for preparing efficient hydrolysis metal sulfide electrode material through one-step method

The invention discloses a method for preparing an efficient hydrolysis metal sulfide electrode material through a one-step method. The method includes the following steps that nickel foam obtained after ultrasonic treatment serves as a carrier and is soaked into a high pressure reactor containing metal sulfide and a precursor, a hydrothermal reaction is made at 140 DEG C-200 DEG C so that the metal sulfide can be loaded on the nickel foam, and reacting is carried out for 6 h. the method has the following beneficial effects that (1) the three-dimensional porous metal sulfide is directly synthesized without the help of a template, the hydrolysis hydrogen evolution and oxygen evolution catalytic activity site density is high, the electronic transferring path is short, and the catalytic performance is good; (2) the metal sulfide of a nano-structure is directly connected with the electrical conductive nickel foam carrier, the contact and the electrical conductivity are good, the specific conductance and the electron transferring efficiency are better improved, and overpotential needed by energy barriers is reduced to a large extent; and (3) electrolyte can enter the interior of the porous electrode material easily, the electric current density is high, the crystal structure is stable, and the circulated stability and durability of the material are greatly improved.
Owner:SUN YAT SEN UNIV

Electrode for electrochemical reduction of CO2 and preparation of formic acid and preparation method and application thereof

The invention relates to an electrode for electrochemical reduction of CO2 and preparation of formic acid and a preparation method and an application thereof, and belongs to the field of a carbon dioxide resource technology. A traditional metal electrode has smooth surface and few catalytic active sites, which are not beneficial to rapid reaction. According to the invention, foamy copper with high specific surface is used as a substrate, and a layer of a low-melting-point metal catalyst is electroplated on the surface of the foamy copper so as to effectively raise reaction rate. The foamy copper can undergo surface electroplating in different formulations of electroplate liquids. The electroplated electrode still maintains a porous structure of foamy copper. The low-melting-point metal coating on the surface can efficiently electro-catalyze carbon dioxide to prepare formic acid. By the method, insufficiency of low surface catalytic active point of a traditional metal electrode can be improved. High Faradic efficiency of electrochemical reduction of CO2 and preparation of formic acid is guaranteed, and generation speed of formic acid also can be accelerated. The method is expected to be applied in the industrial process.
Owner:日照新睿招商发展有限公司

Porous electrode material with three metal Cu-Co-Mo/foamed nickel and preparation method and application of porous electrode material

The invention discloses a porous electrode material with three metal Cu-Co-Mo/foamed nickel and a preparation method and application of the porous electrode material. The method includes the steps that (1) greasy dirt and an oxide layer on the surface of foamed nickel are removed through an organic solution and acid; (2) a copper-cobalt-molybdenum salt compound precursor and the foamed nickel areput in an autoclave for sealed reaction, then washing and drying are performed, and foamed nickel of which the surface is grown with a hydro-thermal synthetic product; and (3) the foamed nickel obtained in the step (2) is subjected to high-temperature calcination under the H2 atmosphere, then natural cooling is performed, and a porous electrolysed water catalyst with the three metal Cu-Co-Mo/foamed nickel. The binding force between the three metal alloy and the substrate nickel in the composite material is high, the properties are stable under the alkaline conditions, the electrochemical active area is large, and the catalytic activity of the material is greatly improved; and through the preparation method, combination of the three metals with the foamed nickel substrate is achieved through a solvothermal method, the preparation is simple, the sintering temperature is low, the energy consumption during preparation is low, and the industrial production is facilitated.
Owner:WUHAN INSTITUTE OF TECHNOLOGY

Preparation method of porous cobalt phosphide nanowire catalyst

The invention discloses a preparation method of a porous cobalt phosphide nanowire catalyst. The method comprises the following steps that a solution is prepared by taking urea as a precipitant, taking cobalt sulfate hepathydrate as a cobalt source and taking glycerin and deionized water as solvents; the solution is added into a high pressure reactor for a hydrothermal reaction, after sufficient reaction is achieved, suction filtration and washing are conducted, vacuum drying is conducted, and then linear basic cobalt carbonate is obtained; in a tubular furnace, air burning is conducted on the linear basic cobalt carbonate at certain temperature, and cobaltosic oxide is obtained; and sodium hypophosphite serves as a phosphorus source, a cobaltosic oxide precursor and sodium hypophosphite are placed at the two ends of the same porcelain boat according to a certain proportion, the phosphorus source is placed at the upper stream of airflow, the treated porcelain boat is put into the tubular furnace for lower temperature calcination in an inert atmosphere, and preparation of the porous cobalt phosphide nanowire catalyst is achieved. The preparation method of the porous cobalt phosphide nanowire catalyst has the advantages that the production technology is simple, the cost is low, electrochemical activity and stability of the catalyst can be effectively improved, and the method is wide in application.
Owner:NANCHANG HANGKONG UNIVERSITY

Preparation method of self-supporting ferronickel layered double hydroxide sulfide electrocatalyst

The invention provides a preparation method of a self-supporting ferronickel layered double hydroxide sulfide electrocatalyst. The preparation method comprises the steps of pretreating original foamednickel to obtain purified foamed nickel; dissolving nickel nitrate hexahydrate, iron nitrate nonahydrate and urea into deionized water according to a preset proportion to obtain a mixed solution, wherein the concentration of cations in the mixed solution is 40-45 mmol/L, and the concentration of urea in the mixed solution is 130-150 mmol/L; carrying out primary hydrothermal reaction on the mixedsolution to obtain NiFe LDH/NF; putting the NiFe LDH/NF into a thioacetamide solution, and carrying out a secondary hydrothermal reaction to obtain NiFe LDH-Sx/NF, wherein x is any number from 1 to 8.According to the preparation method of the self-supporting ferronickel layered double hydroxide sulfide electrocatalyst provided by the invention, the electrocatalyst shows excellent oxygen evolutionreaction catalytic activity under an alkaline condition, a ferronickel double hydroxide nanosheet structure directly growing on foamed nickel is beneficial to electron transfer, the catalytic surfacearea is increased, and the catalytic active sites are improved, so that diffusion of oxygen evolution reaction is facilitated.
Owner:HENAN NORMAL UNIV
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