102results about How to "Inhibition of hydrogen evolution reaction" patented technology

The invention relates to a carbon dioxide electrochemical reduction catalyst as well as a preparation method and an application thereof. The carbon dioxide electrochemical reduction catalyst comprises tin dioxide nanoflower, wherein the tin dioxide nanoflower is synthesized through hydrothermal reaction and comprises the synthesis raw materials including 0.1-0.5M of tin dioxide, 1-5M of trisodium citrate mixed solution and 0.1-0.5M of sodium hydroxide. The carbon dioxide electrochemical reduction catalyst is applied to a carbon dioxide electrochemical reduction catalyst gas diffusion electrode. The carbon dioxide electrochemical reduction catalyst has the advantages that the specific surface area of the catalyst is enlarged, the electrochemical reduction catalytic activity of the catalyst for carbon dioxide reduction is improved, the hydrogen evolution reaction is effectively inhibited, and the selectivity of formic acid in a product is improved.

The invention provides a carbon dioxide electrochemical-reduction catalyst, and preparation and application thereof. The carbon dioxide electrochemical-reduction catalyst is characterized by comprising cuprous oxide nanowires, wherein the cuprous oxide nanowires are synthesized by hydrothermal reaction from 0.01-0.05M copper acetate and 0.01-0.05M anisidine at a volume ratio of 0.9:0.1 to 0.1:0.9. According to the carbon dioxide electrochemical-reduction catalyst, and the preparation and application thereof, the specific surface area of the catalyst is remarkably enlarged, the electrochemical reduction catalysis activity of the catalyst for the reduction of carbon dioxide is improved, and hydrogen evolution reaction is effectively inhibited.

The invention relates to a gas diffusion electrode, a preparation method of the gas diffusion electrode, and the application of the gas diffusion electrode in electrochemical reduction of carbon dioxide. The gas diffusion electrode comprises a gas diffusion electrode body and carbon dioxide electrochemical reduction catalysts loaded on the gas diffusion electrode body. Nano copper oxide supportedon graphite phase carbon nitride serves as the carbon dioxide electrochemical reduction catalysts and has two crystal forms of tenorite and cuprit. The gas diffusion electrode can improve the Faradayefficiency of carbon dioxide electrochemical reduction products such as methane, ethylene and other hydrocarbons, and also can effectively inhibit hydrogen evolution reaction.

The invention discloses a total-iron complexing flow cell with high open-circuit voltage. The total-iron complexing flow cell with high open-circuit voltage is characterized in that iron complexing water solutions are adopted for the positive electrode electrolyte and the negative electrode electrolyte. Iron ions and different types of complexing agents form iron complexing electrolyte, that is, ferrous/phenanthroline complexing electrolyte is adopted for the positive electrode, and ferric iron/triethanolamine complexing electrolyte is adopted for the negative electrode, so that the electrode potentials of ferrous/ferric iron electric pairs respectively move toward the positive direction and the negative direction. The total-iron complexing flow cell consisting of the two iron complexing electrolyte has relatively high cell open-circuit voltage. The iron complex also can inhibit the hydrogen evolution reaction, prevent cross pollution of the electrolyte solution comprising different types of ions, and improve the efficiency of the flow cell.

The invention belongs to the technical field of electrode materials, and particularly relates to a copper-based compound/copper nanoelectrode with an interface synergistic effect and a preparation method and application of the copper-based compound/copper nanoelectrode. The electrode comprises a conductive substrate and a copper-based compound/copper nano-catalyst loaded on the surface, the copper-based compound comprises but is not limited to cuprous oxide, copper nitride, copper oxide and other compounds. The invention also discloses a preparation method and application of the electrode. The electrode material with an interface regulation and control function is prepared for the first time, and the reaction energy barrier of carbon monoxide dimerization is reduced by utilizing the synergistic effect of monovalent copper/zero-valent copper, bivalent copper/zero-valent copper and bivalent copper/monovalent copper/zero-valent copper, so that the hydrogen evolution reaction can be well inhibited during electrochemical carbon dioxide reduction, and good selectivity is achieved on multi-carbon products such as ethylene, ethanol and isopropanol.

The invention relates to a lead-carbon battery composite negative electrode additive and a preparation method thereof, wherein the lead-carbon battery composite negative electrode additive is formed by coating the surface of a reduced graphene oxide lamella with a metal element modified porous carbon material, and contains 0.1-50 wt% of reduced graphene oxide, 40-90 wt% of porous carbon, and 0.1-10 wt% of a metal element. According to the present invention, the lead-carbon battery composite negative electrode additive has high specific surface area and high electronic conductivity; and by doping the lead-carbon battery composite negative electrode additive into a lead-acid battery negative electrode, the lead-carbon battery negative electrode with characteristics of high activity, high charge-discharge reversibility and low hydrogen evolution can be obtained.

The invention discloses a preparation method and application of a carbon material. The carbon material is obtained through high-temperature carbonization synthesis, and synthesis raw materials comprise melamine and amino acid. The structure of the material is nitrogen-doped graphene, and the material is applied to a carbon dioxide electrochemical reduction catalyst gas diffusion electrode. According to the invention, the CO2 electroreduction activity of the catalyst is significantly improved, the catalytic stability is improved, the hydrogen evolution reaction is effectively inhibited, and theselectivity of the product CO is enhanced.

The invention discloses a reduction catalytic material, a gas diffusion electrode and a preparation method of the gas diffusion electrode. The reduction catalytic material comprises carbonized polydopamine particles and Pt nanoparticles bonded to the surfaces of the carbonized polydopamine particles. According to the invention, high-temperature carbonization treatment is carried out on the polydopamine particles with the Pt nanoparticles bonded to the surfaces, and then the specific surface area of the reduction catalytic material can be effectively improved, so that more active sites of the Pt nanoparticles are exposed, the electrochemical reduction catalytic activity of the reduction catalytic material to the reduction of carbon dioxide is increased, and the hydrogen evolution reaction is effectively inhibited. The surface of the gas diffusion electrode provided by the invention is combined with the reduction catalytic material. When the carbon dioxide is reduced by the electrode, the electrode can conduct the current and also can quickly discharge by-products such as H2, CH4 and the like generated by the reduction process out of the working electrode, so that the contact area ofthe CO2 and the reduction catalytic material is ensured, and the Faraday current efficiency is improved.

The invention relates to the technical field of copper wire nickel plating and discloses copper wire nickel-plating electrolyte and a preparation method thereof. The copper wire nickel-plating electrolyte comprises the following materials: 300-350 g/L of nickel sulfate, 10-15 g/L of sodium hypophosphite, 32-40 g/L of boric acid, 3-5 g/L of hydrogen peroxide, 3-5 g/L of active carbon, 0.05-0.15 g/L of a surfactant, 0.5-2 g/L of a rear-earth additive, and the balance of deionized water. The nickel plating electrolyte disclosed by the invention is reasonable in formula, not too low in pH value, capable of avoiding separating out much hydrogen on a cathode, high in cathode efficiency, and free of needle holes on the coating; the copper wire nickel-plating electrolyte disclosed by the invention is added with the rear-earth additive, so that dispersion capacity of the nickel-plating liquor is remarkably improved; the rear earth elements have a certain effect on inhibiting hydrogen evolution reaction and can improve current density of the nickel-plating liquor.

The invention discloses a preparation method of a carbon-based additive used for a lead-carbon negative electrode, and belongs to the technical field of lead-carbon battery manufacturing. A lead layeron the surface of the carbon-based additive used for the lead-carbon negative electrode prepared through carbon material sensitization, activation and chemical lead plating is uniform and compact indistribution, the hydrogen evolution overpotential of carbon material can be obviously improved, and the hydrogen evolution reaction of the negative electrode of a lead acid battery is inhibited; andthe compatibility of carbon material and lead is promoted, so that a good lead and carbon connecting structure is constructed. The high rate part state-of-charge (HRPSoC) simulation test charge-discharge cycles of the lead acid battery with the negative electrode containing the carbon-based additive used for the lead-carbon negative electrode can reach 10555 circles, and is 11 times of that of a contrast lead acid battery. According to the preparation method, sulfation of the negative electrode of the part state-of-charge (PSoC) can be inhibited obviously, and the cycle life of the lead acid battery is prolonged.

The invention discloses a device for photoelectrocatalytic reduction of carbon dioxide. The device comprises a photocatalytic reactor, an electrochemical workstation and a light source lamp arranged outside the photocatalytic reactor; the photocatalytic reactor comprises a photocatalytic reactor, an electrocatalytic reactor, a working electrode, a counter electrode, a reference electrode, a sampleinjection port and a quartz glass window, that photocatalytic reactor and the electrocatalytic reactor are connected through the working electrode, a quartz glass window is arranged on the side of the photocatalytic reactor away from the electrocatalytic reactor, the quartz glass window is correspondingly arranged with the light source lamp, a sample injection port is arranged on the photocatalytic reactor and the electrocatalytic reactor, and the reference electrode and the counter electrode are arranged on the electrocatalytic reactor; the working electrode, the counter electrode and the reference electrode are respectively connected with the electrochemical workstation. The invention can improve the catalytic reduction reaction efficiency of carbon dioxide.

The invention relates to a preparation method of an electric co-depositing zinc magnesium alloy plating layer in an aqueous solution. The preparation method comprises the following steps of: a) preparing an acidic plating solution, preparing a certain amount of zinc sulfate into a solution with a concentration of 100-350g/L, preparing a certain amount of magnesium sulfate into a solution with a concentration of 50-200g/L, and adjusting PH value of the solution to be 1-3 by using sulfuric acid; b) adding polyvinyl glycol as a surface active agent, wherein the concentration of the polyvinyl glycol is 1-4g/L; c) adding complexing agent, namely, adding the complexing agent containing a tartaric acid and sodium monophosphate mixture, wherein the concentration of the tartaric acid is 50-200g/L and the concentration of the sodium monophosphate is 50-150g/L; and d) performing electric deposition by adopting a direct current plating method, thereby lastly obtaining the electric co-depositing zinc magnesium alloy plating layer, wherein the content of magnesium in the plating layer is between 0.8wt% and 2.0wt%. The preparation method provided by the invention has the advantages that the process is stable and is easily operated, and the corrosion resistance of the zinc magnesium alloy plating layer is increased by 3-10 times.

The invention discloses a preparation method for an NxC-coated metal nanoparticle core-shell-structured material. The preparation method comprises the following steps: 1) treating metal nanoparticleswith acid to remove oxides on the surface of the metal nanoparticles; 2) dispersing the obtained nanoparticles in a solvent (such as acetonitrile), slowly adding an organic ligand (such as TCNQ) witha certain mass under stirring, and reacting the ligand with the metal nanoparticles to form an organic salt with a certain thickness on the surfaces of the nanoparticles; and 3) roasting the organic salt-coated metal nanoparticles in a roasting atmosphere to obtain the NxC-coated metal nanoparticle core-shell-structured material. The invention further provides the application of the material. Theinvention provides the preparation method and the application of the NxC-coated metal nanoparticle core-shell-structured material with the metal nanoparticles as a precursor; and the material can be used as a catalyst for a CO2 reduction reaction and has good electrocatalytic activity, good selectivity, high reproducibility and good stability.

The invention belongs to the technical field of catalyst and ammonia preparation, and discloses a boron-nitrogen co-doped carbon material and a preparation method and application thereof. The method comprises the following steps: respectively placing boron nitride and a carbon material in different high temperature reaction regions of a reaction device, wherein boron nitride is located above a gasflow, and the carbon material is located below the gas flow; under the flow of carrier gas, transporting water vapor to a region where the boron nitride is located, and enabling boron nitride to react with the water vapor at a high temperature to obtain a precursor small molecule; transporting the precursor small molecule along with the gas flow to a region where the carbon material is located, and enabling the carbon material and the precursor small molecule to make a co-doping reaction to obtain the boron-nitrogen co-doped carbon material; the temperature of the high temperature reaction is800 to 1200 DEG C; the temperature of the co-doping reaction is 500 to 900 DEG C. The method is simple and low-cost, adopts the raw materials which are cheap and easy to obtain, and is environmentally friendly. The prepared boron-nitrogen co-doped carbon material has good catalytic efficiency when catalyzing nitrogen to prepare ammonia. The boron-nitrogen co-doped carbon material is used for catalyzing nitrogen to produce ammonia.

The invention discloses an anode alloy material for a magnesium-air battery, a preparation method thereof, and a battery, and relates to the technical field of materials. The anode alloy material formagnesium air battery is prepared from the components in percentage by mass: 1.5% to 11.5% of Al, 0.5% to 6.5% of Ca, 0.2% to 6.0% of Bi, 0.1% to 4.0% of Ce, the limiting elements Fe less than or equal to 0.01%, Cu less than or equal to 0.01%, Ni less than or equal to 0.01%, and the balance of Mg. The preparation method of the anode alloy material for the magnesium air battery comprises the stepsof solid solution treatment, rolling, and annealing on casting blanks. The content of each element contained in the casting blanks is matched with the element content of the anode alloy material to beprepared. The anode alloy material can increase the hydrogen evolution overpotential of the magnesium anode, effectively inhibit the hydrogen evolution reaction. The material can make discharge potential relatively negative and the anode utilization rate high. The anode of the battery is made of the alloy materials prepared by the preparation method, and the performance of the alloy materials isgood.

The invention relates to a method for preparing carbon monoxide by electrochemical reduction of carbon dioxide. The method comprises the following steps of: separating a cathode chamber and an anode chamber by a proton exchange membrane by adopting an H-shaped double-electrochemical-cell reactor; introducing carbon dioxide gas into the cathode chamber before reaction; and using a three-electrode system, wherein a gas diffusion electrode is used as a working electrode, a platinum electrode is used as an auxiliary electrode, a silver/silver chloride electrode is used as a reference electrode, the gas diffusion electrode comprises a gas diffusion electrode body and a carbon dioxide electrochemical reduction catalyst loaded on the gas diffusion electrode body, and the carbon dioxide electrochemical reduction catalyst is gold-based bimetal supported by multi-walled carbon nanotubes. The method can improve the Faraday efficiency of the product carbon monoxide.

The invention provides a boron-doped diamond supported metal single atom. The boron-doped diamond supported metal single atom comprises a substrate, a boron-doped diamond thin film arranged on one ortwo sides of the substrate, and a catalyst uniformly supported on the surface of the boron-doped diamond thin film, wherein the catalyst comprises a metal single atom. A prepared electrode of the boron-doped diamond supported metal single atom has a wide electrochemical window, high stability, and high catalytic activity and product selectivity, so that selectivity and efficiency of a catalytic process are greatly improved.

The invention discloses a zinc ion battery electrolyte additive. The additive is amino acids, lipopeptides or polypeptides; an electrolyte is a zinc salt electrolyte, i.e., an electrolytezinc formed by dissolving salt is in deionized water; the concentration of the zinc salt in the electrolyte is 1-3mol/L; and the concentration of the additive added in the electrolyte is 0.01-0.5 mol/L. The additive disclosed by the invention contains alkaline amino acid residues, and can be in a positively charged state in a weakly acidic electrolyte; and the positively charged amino acids, lipopeptides or polypeptides can be adsorbed to favorable nucleation sites of zinc to promote uniform deposition of zinc ions in a zinc deposition process, so that full coverage of the favorable nucleation sites is realized, and dendritic crystal-free growth is realized. The additive has the advantages of inorganic ions and organic polymer additives at the same time, so that dendritic crystal-free growth and corrosion inhibition of a zinc negative electrode are realized, and the cycle life of a battery is prolonged.

The invention relates to the technical field of electrochemistry, and discloses an alloy anode material for an aluminum-air battery, a preparation method of the alloy anode material and the aluminum-air battery. The alloy anode material for the aluminum-air battery comprises the following chemical components in percentage by mass: 0.01 to 2.0 percent of Pb, 0.01 to 2.5 percent of Bi, 0.01 to 1.5 percent of Ga, 0.01 to 2.0 percent of Li, 0.0001 to 0.0010 percent of B and the balance of Al. The preparation method of the alloy anode material for the aluminum-air battery comprises the step of preparing the alloy anode material for the aluminum-air battery by adopting the raw materials containing the chemical components. When the alloy anode material for the aluminum-air battery is used, the hydrogen evolution reaction on the surface is improved, the discharge potential is low, and the anode utilization rate is high. The aluminum-air battery comprises the alloy anode material for the aluminum-air battery, and is good in electrochemical performance.