114results about "Non-noble metal oxide coatings" patented technology

A metal composite electrode for a hydrogen generating apparatus and a hydrogen generating apparatus including the metal composite electrode are disclosed, where the metal composite electrode includes a metal and a metal hydride. The metal composite electrode used in a hydrogen generating apparatus can be utilized to increase the amount and duration of hydrogen generation.

An organic compound hydrogenation apparatus 1 of the present invention includes a reaction cell 13 to which an electrolytic solution is supplied, and an anode 11 and a cathode 12 arranged in the reaction cell 13, in which the cathode 12 is made of a material including a hydrogen storage material, the cathode being arranged as a tubular member so that an organic compound as an object to be treated circulates thereinside. The present invention having the arrangement described above can provide a method for hydrogenating organic compounds and an organic compound hydrogenation apparatus that can enhance efficiency of hydrogenation of the organic compound.

It is an object of the present invention to provide an electrochemical system for producing ammonia from nitrogen oxides which can perform the reaction at room temperature under normal pressure with high ammonia selectivity, and a preparation method thereof.

To achieve the object above, the present invention provides an electrochemical system for producing ammonia from nitrogen oxides characteristically comprising a cathode electrode where the reduction reaction of a complex of nitrogen oxide and a metal complex compound occurs, an anode electrode, a reference electrode, an electrolyte including a metal complex compound, and a nitrogen oxide supply unit.

The present invention also provides a method for producing ammonia from nitrogen oxides, which characteristically comprises the steps of introducing nitrogen oxide in the electrochemical system; forming a complex from the introduced nitrogen oxide and the metal complex compound included in the electrolyte; and performing an electrical reduction reaction of the formed complex. According to the present invention, ammonia can be produced from nitrogen oxides via electrochemical method under normal atmospheric pressure and at room temperature with a high selectivity.

The invention belongs to the technical field of electro-catalysis application, and relates to a preparation method of a hierarchical pore high-entropy alloy water electrolysis catalyst, which comprises the following steps of: by utilizing the difference of mixing enthalpy between melt metal and pre-alloy components, putting the smelted high-entropy pre-alloy into molten metal M, and selectively reacting the molten metal M with elements with negative mixing enthalpy in the pre-alloy to form M-rich and M-poor multi-phase structures; and selectively removing a relatively active M-rich phase in the alloy by utilizing an acidic solution, and diffusing the remaining components to form a three-dimensional bicontinuous high-entropy alloy with a hierarchical pore structure, wherein the size of macropores is 500 nanometers to 2 micrometers, and the size of micropores is 40-200 nanometers. According to the present invention, the cost is reduced, the water electrolysis oxygen production performance of the material can be substantially improved through the synergistic effect among the multi-principal element transition group metals and the hierarchical pore structure, the required overpotential at 10 mA cm <-2 > is 260-300 mV, and the potential industrial application value is great.

The invention provides a metal self-supporting electrode, a preparation method and application, and the preparation method comprises the following steps: S1, grinding and mixing metal or metal oxide powder, an organic solvent and a binder to obtain a slurry; s2, the slurry liquid is sprayed out through a spinning nozzle and enters solidification liquid through an air layer, and a hollow fiber tubular soft body is cast; s3, washing and shaping to obtain a green body; s4, roasting the green body in an oxidizing gas atmosphere to obtain an intermediate product; and S5, heating and reducing the intermediate product in a reducing gas atmosphere, and cooling to obtain the metal self-supporting electrode. The metal self-supporting electrode prepared by the preparation method is applied to electrocatalytic oxidation and reduction of CO2, N2, H2O, CH4, ethylene, propylene and glycerol. The preparation method is simple, convenient and low in cost, and the prepared metal self-supporting electrode has good electrocatalytic oxidation-reduction reaction activity, high product selectivity, high reproducibility and good stability.

The present invention relates to a novel alloy catalyst material for use in the synthesis of hydrogen peroxide from oxygen and hydrogen, or from oxygen and water. The present invention also relates to a cathode and an electrochemical cell comprising the novel catalyst material, and the process use of the novel catalyst material for synthesising hydrogen peroxide from oxygen and hydrogen, or from oxygen and water.

The invention discloses a high-entropy alloy fiber as well as a preparation method and application thereof, relates to an electrochemical catalyst and a preparation method thereof, and aims to solve the problems that an existing platinum catalyst is high in price and low in platinum reserve, and the electrochemical catalysis performance and the stability need to be improved. The preparation method comprises the steps: 1, weighing metal raw materials; 2, smelting the mixed metal raw materials into a metal button ingot by adopting a high-vacuum electric arc smelting furnace, and then melting the button ingot to form a master alloy rod by suction casting; 3, performing drawing treatment on the master alloy rod by adopting melt drawing equipment to obtain alloy fibers; and 4, carrying out free dealloying treatment on the alloy fibers. After the high-entropy alloy fiber is subjected to dealloying treatment, a porous structure is formed on the surface, the overpotential of 230 mV can be achieved on electrochemical oxygen evolution catalysis, the Tafel slope is about 40, a good catalysis effect is achieved, meanwhile, a good electrochemical hydrogen evolution catalysis effect is achieved, and the overpotential of hydrogen evolution catalysis is about 180 mV.

The invention discloses a preparation method of a nickel nanowire array electrode and an application of the nickel nanowire array electrode as an electrochemical oxygen evolution active material, and relates to the field of electrochemical oxygen evolution. The method comprises the steps: firstly, preparing the nickel nanowire array electrode with a high specific surface area by combining a deep reactive ion etching technology and an electroplating method; secondly, modifying a nickel nanowire array electrode substrate with doped metal atoms (Fe, Co and Mo) capable of strengthening or exciting the catalytic activity of the nickel nanowire array electrode substrate to prepare various composite material electrocatalysts, and further strengthening the catalytic activity of the nickel nanowire array electrode; and finally, deeply characterizing the crystal microstructure of the obtained material and testing the electrocatalytic oxygen evolution performance of the material, thereby exploring the application of the nickel nanowire array electrode as the efficient electrochemical oxygen evolution active material. The nickel nanowire array electrode prepared by the method has a high specific surface area and an excellent response signal, and shows relatively good electrocatalytic oxygen evolution activity and stability, so that direct scientific basis and technical means are provided for designing and constructing a stable and efficient electrocatalytic oxygen evolution active material.

The invention relates to a method for preparing a catalytic electrode rich in crystal defects through pulse laser direct writing in a liquid nitrogen environment. The method comprises the following steps: ultrasonically cleaning foamed nickel in distilled water and absolute ethyl alcohol respectively, soaking in diluted hydrochloric acid for 15-30 minutes, taking out the material, cleaning the material with distilled water, and drying the material; soaking the treated foamed nickel in a chloroplatinic acid solution, taking out the material, cleaning the material with distilled water, and drying the material; fixing the prepared foamed nickel to the bottom of an open container, pouring liquid nitrogen into the open container, and placing the open container in the container containing the liquid nitrogen so that the liquid level of the liquid nitrogen can be kept higher than the foamed nickel; at normal temperature, setting the working range of a millisecond laser on a computer by adopting the millisecond laser, and carrying out direct writing by using pulse laser; and moving out the obtained foamed nickel, cleaning with deionized water, and drying the foamed nickel to obtain the platinum-nickel alloy catalytic electrode rich in defects. The preparation method is simple and easy to implement, high in controllability and capable of achieving large-scale production.

The present invention relates to a method for manufacturing an amalgam electrode, an amalgam electrode manufactured by the method, and a method for electrochemical reduction of carbon dioxide using the amalgam electrode.

The invention provides a preparation method of a surface nano-porous NiMoCu catalyst capable of being applied to water electrolysis hydrogen production, and belongs to the technical field of catalyst material preparation. The preparation method comprises the following steps: firstly, preparing a Ni74Mo6Cu20 master alloy strip by utilizing an electric arc melting technology, and preparing the surface nano-porous NiMoCu catalyst by adopting an electrochemical etching method on the basis of the Ni74Mo6Cu20 master alloy strip. The NiMoCu catalyst prepared by the method shows good HER catalytic activity in an alkaline medium, a spongy nano-porous microstructure is obtained after etching, and the active specific surface area is optimized, so that more active sites are exposed, and the purpose of improving the activity of the catalyst is achieved. Meanwhile, the preparation process is simple, raw materials are rich and cheap, expensive and scarce noble metal-based catalysts can be replaced, and commercial application of hydrogen production through water electrolysis is promoted.

Sodium chlorate is produced industrially via electrolysis of brine and is thus an energy intensive process. An improved cathode for this and other industrial processes is a low nickel content stainless steel whose surface has been suitably modified. With an appropriate amount of surface roughening, the cathode provides for improved overvoltages during electrolysis while still maintaining corrosion resistance.

The present disclosure provides a system for electrochemical conversion of carbon dioxide, including: a reduction electrode unit to which carbon dioxide is supplied and including a metal-containing electrode; an oxidation electrode unit including a sacrificial electrode; and an electrolyte unit including an aprotic polar organic solvent and an auxiliary electrolyte, which is in contact with the reduction electrode unit and the oxidation electrode unit, and the carbon dioxide supplied to the reduction electrode unit is electrochemically reduced so as to produce an oxalate salt.

A method of a hydrocarbon product and ammonia comprises introducing C₂H₆ to a positive electrode of an electrochemical cell comprising the positive electrode, a negative electrode, and a proton-conducting membrane between the positive electrode and the negative electrode. The proton-conducting membrane comprising an electrolyte material having an ionic conductivity greater than or equal to about 10⁻² S/cm at one or more temperatures within a range of from about 150° C. to about 600° C. N₂ is introduced to the negative electrode of the electrochemical cell. A potential difference is applied between the positive electrode and the negative electrode of the electrochemical cell. A system for co-producing higher hydrocarbons and NH₃, and an electrochemical cell are also described.

The embodiments described herein pertain generally to an amalgam electrode, and a producing method of the amalgam electrode, and an electrochemical reduction method of carbon dioxide using the amalgam electrode.

The invention discloses a method for preparing sodium persulfate by direct electrooxidation. The method is characterized in that an anode is a titanium-plated platinum electrode prepared by a roasting method, a cathode is an alloy electrode prepared by a casting method, a bath pressure is greatly reduced, a two-electrode system is adopted, an anode electrolytic solution is a mixed solution of 220-300g/L of sodium sulfate and 200-400g/L of sulfuric acid, a cathode electrolytic solutionis a 20% wt dilute sulfuric acid solution, an anode additive is 0-2g/L sodium thiocyanate, the main product sodium persulfate is obtained after the electrolytic reaction is carried out in a plate frame type electrolytic cell under the constant current conditions that the temperature is 15-40 DEG C and the current density is 0.5-1.5 A/m<2>, the current efficiency can be up to 90.23%, and the concentration of the sodium persulfate can be up to 198.95 g/L. According to the method, by changing electrode materials and optimizing process conditions, the purposes of low energy consumption, low cost, low raw material consumption and relatively high current efficiency and yield are achieved.