128 results about "Electrochemical reduction of carbon dioxide" patented technology

An environmentally beneficial method of producing methanol from varied sources of carbon dioxide including flue gases of fossil fuel burning power plants, industrial exhaust gases or the atmosphere itself. Converting carbon dioxide by an electrochemical reduction of carbon dioxide in a divided electrochemical cell that includes an anode in one cell compartment and a metal cathode electrode in another cell compartment that also contains an aqueous solution comprising methanol and an electrolyte of one or more alkyl ammonium halides, alkali carbonates or combinations thereof to produce therein a reaction mixture containing carbon monoxide and hydrogen which can be subsequently used to produce methanol while also producing oxygen in the cell at the anode.

An environmentally beneficial method of producing methanol from varied sources of carbon dioxide including flue gases of fossil fuel burning power plants, industrial exhaust gases or the atmosphere itself. Converting carbon dioxide by an electrochemical reduction of carbon dioxide in a divided electrochemical cell that includes an anode in one compartment and a metal cathode electrode in a compartment that also contains an aqueous solution comprising methanol and an electrolyte. An anion-conducting membrane can be provided between the anode and cathode to produce at the cathode therein a reaction mixture containing carbon monoxide and hydrogen, which can be subsequently used to produce methanol while also producing oxygen in the cell at the anode. The oxygen produced at the anode can be recycled for efficient combustion of fossil fuels in power plants to exclusively produce CO₂ exhausts for capture and recycling as the source of CO₂ for the cell.

The invention relates to a method for preparing hydrocarbon through electrochemical reduction of carbon dioxide. An electrolytic tank is divided into a left cavity and a right cavity through a proton exchange membrane, the left cavity and the right cavity are not communicated with each other, and the two cavities serve as a cathode chamber and an anode chamber respectively; and the cathode chamber is filled with an electrolyte solution, the electrolyte solution is an inorganic electrolyte aqueous solution where the carbon dioxide is dissolved, and an organic solvent is further added into the electrolyte solution. The method of combining inorganic salts and the organic solvent is adopted, and metal Cu electrodes in different shapes and forms serve as cathodes, anodes are formed by Pt pieces or Pt wire electrodes and the like, and therefore the conversion rate of the carbon dioxide and the energy cycle utilization rate are greatly increased.

The invention provides a preparation method of a porous copper electrode for electrochemical reduction of carbon dioxide. The preparation method comprises the following steps: 1) a layer of a sacrificial metal is electrolytic deposited on a copper base material; 2) a heat treatment is conducted under the protection of an inert gas, so that a solid state diffusion between a metal copper and sacrificial metal atoms occurs, and an alloy layer of the sacrificial metal and the copper is obtained on the surface of the copper; 3) the electrochemical dealloying is conducted. The porosity of the porous copper electrode is 50%-95%, the pore size is 50 nm-500 nm, and the sacrificial metal content is no more than 5%. The porous copper electrode has the characteristics of adjustable pore size and quantity, good air permeability and high specific surface area. The porous copper electrode has better specificity for the selection of target products and is suitable for electrochemical reduction reaction of carbon dioxide catalyzing.

The invention provides a catalyst for electrochemical reduction of carbon dioxide. The catalyst is a carbon-loaded nano AgxZnyOz or AgxZny alloy, wherein x is greater than 0 and less than 1, y is greater than 0 and less than 1, x+y is equal to 1, and z is less than or equal to 2x+y. The invention further provides a preparation method of the catalyst. The particle sizes of two catalyst active components of the catalyst reach a nano level, thus ensuring that the catalyst has multiple active sites and a relatively large current density. The catalyst provided by the invention is high in CO2 electric reduction catalytic activity, low in decomposition voltage and high in CO2 conversion efficiency. Two preparation methods of the catalyst are high in process amplification capability and comprise core steps of double decomposition and precipitation or impregnation and calcinations which are easy to control.

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.

Described herein is a process for the reduction of carbon dioxide comprising: providing an electrochemical device comprising an anode, a cathode, and a polymeric anion exchange membrane therebetween, wherein the polymeric anion exchange membrane comprises an anion exchange polymer, wherein the anion exchange polymer comprises at least one positively charged group selected from a guanidinium, a guanidinium derivative, an N-alkyl conjugated heterocyclic cation, or combinations thereof; introducing a composition comprising carbon dioxide to the cathode; and applying electrical energy to the electrochemical device to effect electrochemical reduction of the carbon dioxide.

The invention discloses a supported silver nanonet, and a preparation method and application thereof. The preparation method comprises the following steps: by using a copper sulfate-n-propanol mixed solution as an electrolyte, Ag/AgCl as a reference electrode, a platinum sheet as a counter electrode and ITO (indium tin oxide) as a work electrode, preparing cuprous oxide nano cubes supported on an ITO substrate by a constant voltage process, cleaning the surface, drying in a vacuum drying oven, adding silver nitrate to sufficiently react by using the cuprous oxide nano cubes supported on the ITO substrate as a template and reducer, taking out, cleaning with deionized water, and carrying out vacuum drying to obtain the ITO-supported net silver nano structure which is the supported silver nanonet. The material can be used for electrochemical reduction of carbon dioxide. The net silver nano structure electrode material has application potential in electrochemical catalytic reduction of carbon dioxide. The preparation method is simple to operate and easy to control, and does not generate any toxic substance.

The invention discloses a nano copper electrode material which comprises a conductive substrate and super-aerophilic copper nanowire aggregate attached to the surface of the conductive substrate, wherein multiple grain boundaries exist on the copper nanowire surface. The invention further discloses a preparation method of the nano copper electrode material and application thereof in electrochemical reduction of carbon dioxide.

The invention relates to an electrode for electrochemical reduction of carbon dioxide and application thereof. A catalyst is an ordered core-shell catalyst. The preparation method of the electrode comprises the following steps: pretreatment of a substrate: immersing a substrate layer into a certain amount of a mixture of sodium hydroxide and oxide, and preparing a CuOx nanowire/Cu substrate by a chemical oxidation method; adding a reducing agent and an additive into copper salt, mixing according to a certain proportion, performing Cu deposition by utilizing variable current density, carrying out washing, drying and baking, and then putting the obtained electrode into a CO2 saturated electrolyte for reduction at a constant potential, and carrying out washing and drying; and soaking the prepared gas diffusion electrode in a concentrated hydrochloric acid solution with the concentration of 36%-38% to obtain the electrode. The vacancy copper has more active areas and defect sites and the coupling synergistic effect among the components is utilized, so that the selectivity and activity of the hydrocarbon are improved. By utilizing the interaction between Cu<+> and each metal, CO2 electroreduction is limited in a functional structural domain, so that the loss of the catalyst in the CO2 reduction process is avoided, and the stability of the catalyst is improved.

The invention provides a method for preparing a gas diffusion electrode of hydrocarbon through electrochemical reduction of carbon dioxide. The method comprises the following steps: (1), taking porous carbon material as a substrate, and carrying out thermal treatment in the air to remove the coating on the surface of carbon fiber and increase the hydrophilia of the carbon fiber to aqueous solution so as to obtain a gas diffusion substrate; (2) preparing supported nano Cu/C; (3) taking the porous carbon material subjected to thermal treatment as the substrate, and depositing particles containing Cu/C on the surface and the cross section of the carbon material under negative pressure; (4) soaking the gas diffusion electrode sample in HCl acid solution for at least 24 h, and cleaning the gas diffusion electrode sample up; and (5) spraying alcoholic solution of perfluorosulfonic acid resin on the gas diffusion electrode, and drying at the room temperature to obtain the gas diffusion electrode of hydrocarbon through electrochemical reduction of carbon dioxide. The method has the following advantages: the raw material cost is low, the preparation process is simple, the dispersion distribution characteristic of Cu particle can be kept to the maximum to prevent agglomeration of nano Cu particles, and high catalytic activity to hydrocarbon during the electrochemical reduction process of CO2 is ensured.

The invention relates to a gas diffusion electrode used for electrochemical reduction of carbon dioxide and a preparation method and an application of the gas diffusion electrode. The electrode comprises a base layer, and a Sn catalyst and an organic accessory ingredient mixing layer attached on the base layer; the molar ratio of the Sn catalyst to the organic accessory ingredient is 100:1 to 30:1; and the loading amount of the Sn catalyst in the electrode is 0.1-5mg/cm<-2>. In the electrochemical reduction of carbon dioxide, the base layer plays the effects of a supporting body, electric conduction, and forming liquid and gas transmission channels; the Sn catalyst catalyzes reduction of carbon dioxide while the organic accessory ingredient can stabilize an intermediate reactant CO<2>.-, so that the concentration of CO<2> is improved, overpotential in electrochemical reduction of carbon dioxide is lowered, and current density and efficiency are improved; and in addition, the accessory ingredient in the electrode also anchors the Sn catalyst on the surface of the carbon base, so that the electrode has quite high stability.

The invention discloses a copper oxide nanowire loaded silver particle composite electrode, a preparation method and application, which belong to the technical field of electrochemistry. According tothe composite electrode, foamy copper or copper foil serves as a substrate, Cu (OH) 2 nanowires are synthesized through a chemical oxidation method and then annealed in air to prepare CuO nanowires, metal Ag is deposited on the foamy copper or copper foil through a strong light irradiation method, and the composite electrode serves as an electrochemical reduction carbon dioxide catalytic electrode. The electrode provided by the invention has a very high specific surface area, improves the defect of few catalytic active sites on the surface of a traditional metal foil electrode, improves the activity of electrochemical reduction of carbon dioxide, and has the advantages of novel and simple preparation method, low cost, strong operability and good application prospect.

The invention belongs to the technical field of electrode materials, and particularly relates to a copper nano-electrode with a high-index crystal face and a preparation method and application of thecopper nano-electrode. The electrode comprises a conductive substrate and a copper nanowire aggregate loaded on the surface of the conductive substrate; the length of the copper nanowire is 10-200 microns, the length-diameter ratio of the copper nanowire is larger than 1000, the surface of the copper nanowire is in a step shape and has high-index crystal faces, and the high-index crystal faces include but are not limited to high-index crystal faces (200), (220), (222), (311), (310), (320), (331), (400), (510), (511), (533), (610) and (755). The invention further discloses a preparation methodand application of the above electrode. The electrode material with the high-index crystal face is prepared for the first time, side reaction can be well inhibited when the electrode material is usedfor electrochemical reduction of carbon dioxide, and the electrode material has good selectivity on high-carbon products such as ethylene, ethanol and isopropanol.

The invention relates to the technical field of electrochemical reduction catalysts, in particular to a carbon dioxide electrochemical reduction catalyst and a preparation method thereof and a catalyst loaded gas diffusion electrode. The carbon dioxide electrochemical reduction catalyst is of a nano-catalyst and is specifically a nickel-copper lamellar bimetallic oxide with a composite lamellar structure of nickel-copper oxide and copper oxide, or nickel-tin lamellar bimetallic oxide with a composite lamellar structure of nickel oxide and tin oxide. The nano-catalyst with the structure is highin catalytic activity, overpotential in electrochemical reduction process is greatly reduced, and meanwhile, hydrogen evolution reaction in the process of carbon dioxide reduction is effectively restrained. The invention further provides the preparation method of the catalyst and the catalyst loaded gas diffusion electrode, the problem about excessive low reduction current can be solved, and theFaradic efficiency in the electrochemical reduction of carbon dioxide is effectively improved.

The disclosure relates generally to improved methods for the reduction of carbon dioxide. The disclosure relates more specifically to catalytic methods for electrochemical reduction of carbon dioxide that can be operated at commercially viable voltages and at low overpotentials. The disclosure uses a transition metal dichalcogenide and helper catalyst in contact within the cell.

The invention discloses a device for microorganism electrochemical reduction of carbon dioxide, in order to solve the problems of the prior art that carbon dioxide is difficult to transfer between solution and microorganisms, the surface area of a microorganism electrochemical cathode material is low and the like. The invention comprises: 1) adopting the microorganism as a cathode catalyst for electrochemical reduction of carbon dioxide and converting carbon dioxide into an organic product; 2) adopting a porous metallic hollow fiber cathode and connecting an external carbon dioxide bag throughan air guide pipe so as to supply an inorganic carbon source for the growth of the microorganisms on the porous metallic hollow fiber cathode. According to the method provided by the invention, a three-dimensional cathode material with large surface area and being beneficial to direct transmission of carbon dioxide can be prepared; the method is beneficial to the growth of the microorganisms on the cathode; the device for electrochemical reduction of carbon dioxide provided by the invention is low in cost, can be used for a long time, is high in use ratio of energy, and is suitable for large-scale application in carbon dioxide reduction, electrode material preparation and microorganism electrolytic tanks.

The invention relates to preparation and application of a copper electrode for electrochemical reduction of carbon dioxide. The preparation method of the electrode comprises the following steps: treating a substrate, oxidizing the substrate at a high temperature, mixing a precursor copper salt solution with an alkaline precipitator, a reducing agent and an additive according to a certain ratio, depositing copper by a hydrothermal method, performing electrochemical potentiostatic reduction, and washing with concentrated hydrochloric acid to prepare the copper electrode. According to the invention, the Cu oxide with the nanowire structure grows on the substrate through a chemical oxidation reaction; then, thin-layer nano-particles grow on the surface through hydrothermal reaction; a surfactant and a reducing agent are introduced in the hydrothermal reaction process; the surface active agent is used for directionally adsorbing the surface of the substrate metal; the growth orientation ofthe metal oxide can be regulated and controlled, a reducing agent is introduced through hydrothermal reaction deposition, the nanowire part of the substrate layer is reduced to form hole copper, nanocopper particles with high specific surface area are deposited on the surface of the hole copper, the active specific surface area of the copper electrode is increased, and the proportion of edge andcorner active sites is increased.

The invention provides a coupling method of anode oxidization hypochlorite production and cathode carbon dioxide reduction. A single-atom iron loaded nitrogen doping carbon material is used as a catalyst to perform electrocatalytic reduction on CO2; meanwhile, the anode oxidization can produce hypochlorite, so that the goal of efficiently producing hypochlorite and reducing carbon dioxide into carbon monoxide at the same time can be achieved; the single-atom iron loaded nitrogen doping carbon material has a polyhedron microstructure with the length and width in the nanometer scale dimensions;the loaded metal in the single-atom iron loaded nitrogen doping carbon material is dispersed in a single atom form. The material is used for electrochemical reduction of carbon dioxide; the current efficiency for selectively reducing the carbon dioxide into the carbon monoxide is as high as 99.63 percent or higher; the stability is high; meanwhile, the current efficiency for producing the hypochlorite by the anode is as high as 99.47 percent; high faradic efficiency can be maintained for a long time.

A carbon dioxide reduction reaction electrocatalyst comprises a pyrolyzed copper-based metal-organic framework (MOF) that produces isopropanol from electrochemical reduction of carbon dioxide. A process for producing isopropanol from electrochemical reduction of carbon dioxide comprises applying a potential in an electrochemical cell in the range of about −2V to about −3V versus a silver chloride electrode.