US20240026552A1

US20240026552A1 - Electrochemical Equipment and System thereof for Reduction of Carbon Dioxide

Info

Publication number: US20240026552A1
Application number: US18/137,120
Authority: US
Inventors: Hao Ming Chen; Tai-Lung Chen
Original assignee: National Taiwan University NTU
Current assignee: National Taiwan University NTU
Priority date: 2022-07-22
Filing date: 2023-04-20
Publication date: 2024-01-25
Also published as: TW202405247A

Abstract

An electrochemical equipment and system thereof for reduction of carbon dioxide is provided with cathode compartment, catholyte compartment, anode compartment, anolyte chamber, and isolation unit.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to an equipment and system thereof for reduction of carbon dioxide, particularly to an electrochemical equipment and system thereof for reduction of carbon dioxide.

2. Description of the Prior Art

The “carbon footprint” refers to the greenhouse gases directly or indirectly produced by human beings in various activities. When the greenhouse gases are discharged into the atmosphere of earth, the greenhouse effect is produced, and then, global warming will be caused by greenhouse effect. Thus, the total weight of greenhouse gases is called as “carbon footprint”. Among various greenhouse gases, carbon dioxide (CO₂) occupies the largest proportion in the atmosphere, so that the weight of carbon dioxide is the most common measure stand of carbon footprint, and the so-called carbon footprint can be defined as the amount of carbon dioxide emission directly and indirectly produced during the entire life cycle of an activity or product, wherein the life cycle refers to the raw materials obtained, or produced from natural resources to the final disposal, related to the continuous and interconnected schedules in the product system.
The abovementioned “greenhouse gas effect” caused by carbon dioxide, that is, the increase of greenhouse gases clue to the rapid growth of carbon footprint, so that the increase of greenhouse gases is become one of the important factors leading to the climate change. The huge impact of carbon footprint on the earth, including the increased global warming, the rise in global average temperature, and the rise in sea level are intensified extreme climates and accelerated global warming. Therefore, in order to slow down the impact of global warming on the earth, the most direct and effective method is to reduce the greenhouse gases, in other words, to reduce the carbon footprint as soon as possible.
In order to achieve net zero carbon footprint, which becomes an urgent goal for human beings around the world, Therefore, the technologies for capturing, reusing and sequestering carbon dioxide are accelerated to research and to develop. In terms of carbon dioxide reuse, the industry is currently focused on converting carbon dioxide into other energy sources. The reduction of carbon dioxide is taked to form the carbon monoxide or other hydrocarbons, as such an example, which are the combinations of the photocatalyst, and are combined as the water decomposition system, to decompose water in order to produce oxygen, and then the reduction of carbon dioxide is achieved, that is, the reduction and conversion of carbon dioxide into hydrocarbon or alcohol chemical fuels by photocatalysis, in this stage, the solar energy is used to decompose water (H₂O) to produce hydrogen or convert carbon dioxide to prepare fuels, and metal catalysts are used to reduce carbon dioxide or non-aqueous solution to produce hydrocarbon or alcohol chemical fuel. Including the abovementioned photocatalyst method can only be carried out in batch reactor and the energy conversion efficiency is relatively low, which is not conducive to the industry that needs to be processed as a large amount of carbon dioxide.
Therefore, the industry is looking forward to develop an electrochemical equipment or system that can effectively reduce carbon dioxide. The highly environment friendly electrochemical equipment for reduction of carbon dioxide and system thereof should be able to be used by the related industries.

SUMMARY OF THE INVENTION

The invention provides an electrochemical equipment for reduction of carbon dioxide and system thereof. The carbon dioxide feed is carbon dioxide gas, and a gas diffusion electrode is used as a cathodic electrode. The function of the gas diffusion electrode is mainly to increase the concentration of reactants, thereby improving the reactivity (high current density).
According to the abovementioned description, a three-chamber electrochemical equipment for reducing carbon dioxide of the invention comprises: a cathode chamber comprising a cathode gas input port, and a cathode gas output port, wherein the carbon dioxide gas feed enters into the cathode chamber from the cathode gas input port, the mixed gas with the carbon dioxide reduction product leaves out the cathode chamber from the cathode gas output port; a cathode electrolyte chamber, which allows the cathode electrolyte to pass or to stay, wherein the cathode electrode is arranged between the cathode chamber and the cathode electrolyte chamber, the cathode electrode reduces the carbon dioxide gas feed to form a mixed gas and a mixed liquid with carbon dioxide reduction product exiting out the equipment through a cathode gas output port and a liquid output port, respectively; an isolation unit; and, an anode chamber and the isolation unit separates into the anode chamber and the cathode electrolyte chamber, the anode chamber includes an anode input port, an anode output port and an anode electrode, the anode chamber is attached to the isolation unit with the anode electrode, and the isolation unit is attached to the cathode electrolyte chamber, wherein the anode feed enters into the anode chamber from the anode input port to contact the anode electrode, the anode feed is liquid, and the anode discharge exits out the anode chamber from the anode output port.
According to the abovementioned description, a four-chamber electrochemical equipment for reducing carbon dioxide of the invention comprises: a cathode chamber, comprising a cathode gas input port, and a cathode gas output port, wherein the carbon dioxide gas feed enters into the cathode chamber from the cathode gas input port, the mixed gas with carbon dioxide reduction product leaves out the cathode chamber from the cathode gas output port; a cathode electrolyte chamber, the cathode electrolyte is allowed to pass or to stay, the cathode electrode reduces the carbon dioxide gas feed to form a mixed gas and a mixed liquid with carbon dioxide reduction product exiting out the equipment through a cathode gas output port and a liquid output port, respectively, the cathode electrode is arranged between the cathode chamber and the cathode electrolyte chamber; an isolation unit; the anode electrolyte chamber and the isolation unit separate the anode electrolyte chamber and the cathode electrolyte chamber, the anode electrolyte chamber owns an anode electrolyte input port and an anode electrolyte output port, wherein the anode electrolyte feed enters into the anode electrolyte chamber from the anode electrolyte input port, and the anode electrolyte discharge leaves out the anode electrolyte chamber from the anode electrolyte output port; and an anode chamber, comprising an anode input port, an anode output port and an anode electrode, the anode electrode is arranged between the anode chamber and the anode electrolyte chamber, and the anode electrolyte chamber is interposed between the isolation unit and the anode electrode, wherein the anode feed enters into the anode chamber from the anode input port to contact the anode electrode, the anode feed is gas, and the anode discharge exits out the anode chamber from the anode output port.
The present invention relates to a system of electrochemical equipment for reduction of carbon dioxide, comprising a plurality of electrochemical equipment for reducing carbon dioxide connected to each other in series connection method or parallel connection method, or comninations of at least any two of series and parallel.
One of the advantage for the present invention relates to an electrochemical equipment for reduction of carbon dioxide, when the carbon dioxide feed is carbon dioxide gas, the problem of poor solubility of carbon dioxide in the common cathode electrolyte can be avoided, and the gas diffusion electrode is used as the cathode electrode, thereby increasing the reactant concentration results in a high current density, which in turn increases the reactivity.
One of the advantage for the present invention relates to an electrochemical equipment for reduction of carbon dioxide, when the arrangement adopted in the invention is used, the distance between the electrodes can be effectively reduced in order to reduce the resistance, thereby reducing the resistance of the reaction tank, improving the stability of the electrodes and obtaining high current density.
One of the advantage fir the present invention relates to an electrochemical equipment for reduction of carbon dioxide, the isolation units are used to isolate the substances in the two chambers to prevent the direct exchange of substances, and at the same time allow the flow of ions to maintain the electrically neutral balance required for the operation of the electrolytic tank.
One of the advantage for the present invention relates to an electrochemical equipment for reduction of carbon dioxide, the cathode chamber can be provided with respective input ports and output ports. Therefore, the products of different phases produced through the cathode electrolytic reaction can be directly separated out from the cathode chamber and the cathode electrolyte chamber through the respective output ports, which also owns the effect of reducing the cost of the separated products, and improving the purity of the products. Similarly, the anode chamber can also achieve the effect of split-flow in the same way method, which is beneficial to the separation of gas-liquid products.
In order to further understand the technical content and features of the invention, please refer to the following detailed descriptions and figures of the invention, but the figures provided herein are used for reference and illustration purposes only, and are not used for limiting the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing aspects and many of the attendant advantages of this invention will become more readily appreciated as the same becomes better understood by reference to the following detailed description, when taken in conjunction with the accompanying drawings, wherein:

FIG. 1 illustrates the schematic cross-sectional view of a first embodiment of the electrochemical equipment and system thereof for reducing carbon dioxide according to the present invention.

FIG. 2 illustrates the schematic cross-sectional view of a second embodiment of the electrochemical equipment and system thereof for reducing carbon dioxide according to the present invention.

FIG. 3 illustrates the block diagram of a first embodiment of the system comprising the electrochemical equipment for reducing carbon dioxide according to the present invention.

FIG. 4 illustrates the block diagram of a second embodiment of the system comprising the electrochemical equipment for reducing carbon dioxide according to the present invention.

FIG. 5 illustrates the block diagram of a third embodiment of the system comprising the electrochemical equipment for reducing carbon dioxide according to the present invention.

FIG. 6 illustrates the block diagram of a fourth embodiment of the system comprising the electrochemical equipment for reducing carbon dioxide according to the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT

The implementation method of the electrochemical equipment for reducing carbon dioxide and the system thereof of the invention will be described below through the specific embodiments. Those skilled in the art can understand the advantages and effects of the invention from the content disclosed herein. The invention can be realized or applied through other specific embodiments. Various details can be modified and changed based on different viewpoints and applications without departing from the concept of the invention, and the accompanying figures of the invention are only schematic representations, not drawn according to actual size, and specific details may be enlarged for convenience of description. The term “or” as used herein shall include any communications of at least any two of the associated listed items as the case may be.
FIG. 1 illustrates the schematic cross-sectional view of a first embodiment of the electrochemical and system thereof equipment for reducing carbon dioxide according to the invention. Please refer to FIG. 1 , the electrochemical equipment 2 for reducing carbon dioxide is illustrated, which includes a cathode chamber 10, a cathode electrode 12, a cathode electrolyte chamber 11, an isolation unit 30, an anode electrode 22, and an anode chamber 20.
Still please refer to FIG. 1 , the cathode chamber 10 owns a cathode gas input port 13, and a cathode gas output port 15, both are all located at appropriate positions in the cathode chamber 10 for externally connecting to other elements, structures, equipment or devices without being limited as shown in the FIG. 1 , and the cathode chamber 10 can be connected to the pipes, components, equipment or devices for the input gas feed through the cathode gas input port 13.
As shown in FIG. 1 , in the cathode chamber 10 of the present embodiment, the carbon dioxide is entered into the cathode chamber 10 from the cathode gas input port 13, and the carbon dioxide herein can be the gas including carbon dioxide. The concentration of carbon dioxide gas may be 0.01 to 100 of volume percentage as the example but not limited, and the gas used for diluting can be nitrogen, argon etc. Here, the phase of the carbon dioxide gas feed 14 is mainly the gas phase. The cathode gas input port 13 of the invention is mainly used for feeding the cathode gas, in actual operation, a very small amount of moisture may be mixed in the cathode feeding gas. However, this is not the core technology claimed by the invention. Therefore, about the cathode gas feed in the cathode gas input port 13, it is not limited that the cathode gas feed of the invention must not contain liquid phase moisture, but the carbon dioxide gas feed of the invention, which enters into the reduction equipment in the gas phase for electrochemical reaction. Secondly, in the electrolytic reaction, the carbon dioxide is entered into the cathode chamber 10 from the cathode gas input port 13, which is reduced to carbon monoxide on the cathode electrode 12, or further including other product gases, such as methane, ethane, ethylene, formic acid, methanol or ethanol and comninations of at least any two of foregoing substances. Also, carbon monoxide, other gas products, unreacted gases, unfinished carbon dioxide, or some or all of the abovemnentioned gases, which can be used to form a mixed gas 16 with carbon dioxide reduction products.
Still as shown in FIG. 1 , in the cathode chamber 10 of the embodiment, a mixed gas 16 of carbon dioxide reduction product is produced, and the mixed gas 16 can be leaved out the cathode chamber 10 through the cathode gas output port 15. The gas output port 15 can be connected to the external pipe, so that the mixed gas 16 with the carbon dioxide reduction product is sent to other units, equipment or devices through the pipe for further processing. The mixed gas 16 with carbon dioxide reduction product of the invention is also mainly based on the gas phase discharge of the mixed gas, but it is not limited by the existence of only the gas phase. In actual operation, it may be due to operating conditions or environment and other parameters, and very little liquid moisture exists in the mixed gas 16 with carbon dioxide reduction product, or when the water vapor and moisture reach a gas-liquid equilibrium, both will appear in the mixed gas 16 with carbon dioxide reduction product. Therefore, the cathode chamber 10 of the invention is set as a space to provide the cathode electrolytic reaction, and there are one or more input ports, and one or more output ports to provide the cathode reactants and the cathode electrolyte inlet, outlet, and stay.
Continuing to refer to FIG. 1 , the cathode electrode 12 is disposed between the cathode chamber 10 and the cathode electrolyte chamber 11. In an embodiment of the invention, the cathode electrode 12 facilitates the reduction reaction of the gas-phase reactant carbon dioxide, such as a porous electrode. Secondly, the cathode electrode 12 may further include one or more cathode catalysts, such as gold, silver, zinc, copper, bismuth, tin, or other metals or metal single-atom catalysts or comninations of at least any two of foregoing substances, provided in a suitable manner on the cathode electrode 12, for example but not limited to, physical or chemical adsorption, or chemical bonding is used for connection.
As shown in FIG. 1 again, the cathode electrode 12 is disposed between the cathode chamber 10 and the cathode electrolyte chamber 11, that is, the cathode electrolyte chamber 11 is adjacent to the cathode chamber 10 with the cathode electrode 12. The cathode electrode 12 can be used as the gas-liquid separation interface to conduct the split-flow of gas-phase and liquid-phase carbon dioxide reduction product produced by the cathode electrolytic reaction. Thus, the cathode electrode 12 allows the cathode electrolyte chamber 11 and the cathode chamber 10 to be provided with respective input ports and output ports. Therefore, the products of different phases produced from the cathode electrolytic reaction can be directly separated from the cathode chamber 10 through their respective output ports, which owns the effect of reducing the cost of the separated products and improving the purity of the products.
Continuing to refer to FIG. 1 , the cathode electrolyte chamber 11 includes a cathode electrolyte input port 33 and a liquid output port 35, and the cathode electrolyte input port 33 and the liquid output port 35 are located at the appropriate positions in the cathode electrolyte chamber 11, respectively. The cathode electrolyte chamber 11 is adjacent to the cathode electrolyte chamber 10 with the cathode electrode 12, in order to connect other elements, structures, equipment or devices to the outside without being limited by the figures. The cathode electrolyte feed 34 enters into the cathode electrolyte chamber 11 from the cathode electrolyte input port 33, and leaves out the cathode electrolyte chamber 11 through the liquid output port 35 after participating in the reaction. The cathode electrolyte feed 34 is a liquid phase, and the liquid product 36 includes cathode electrolyte and cathode electrolyte products, alcohols, acids and urea, with low carbon numbers, wherein the cathode electrolyte products can be a kind of single product or mixed products.
Please refer to FIG. 1 , the cathode electrolyte used in the cathode electrolyte chamber 11 may include the cathode electrolyte described below, for example but not limited to, sodium hydroxide, sodium bromide, sodium bicarbonate, and sodium sulfate, sodium phosphate, sodium hydrogen phosphate, lithium hydroxide, lithium bromide, lithium hydrogen carbonate, lithium sulfate, lithium phosphate, lithium hydrogen phosphate, potassium hydroxide, potassium bromide, potassium hydrogen carbonate, potassium sulfate, potassium phosphate, potassium hydrogen phosphate, or comninations of at least any two of the abovementioned electrolytes. The anode electrolytes such as, but not limited to, sodium hydroxide, sodium bromide, sodium bicarbonate, sodium sulfate, sodium phosphate, sodium hydrogen phosphate, lithium hydroxide, lithium bromide, lithium bicarbonate, lithium sulfate, lithium phosphate, lithium hydrogen phosphate, potassium hydroxide, potassium bromide, potassium bicarbonate, potassium sulfate, potassium phosphate, potassium hydrogen phosphate, urea, potassium chloride, sodium chloride, or any comninations of at least any two of foregoing substances. The solid-state electrolyte can include polymer solid-state electrolytes, inorganic solid-state electrolytes, organic and inorganic composite solid-state electrolytes, and colloidal electrolytes etc.
As shown in FIG. 1 , the isolation unit 30 of this embodiment is adjacent to the cathode electrolyte chamber 11, and the invention uses the isolation unit 30 to block the substances in the two chambers to a limited extent, direct exchange of substances is prevented, and at the same time the flow of ions is allowed to maintain the electrically neutral balance required for the operation of the electrolytic tank. The isolation unit 30 can be a porous ceramic, a bipolar membrane, an anion, or a cation semipermeable membrane. According to the abovementioned description, when the carbon dioxide feed is carbon dioxide gas, the problem of poor solubility of carbon dioxide in the common cathode electrolyte can be avoided, thereby increasing the concentration of reactants and thus improving the reactivity (high current density). Mainly because the function of the gas diffusion electrode is to increase the concentration of reactants, thereby increasing the reactivity (high current density). Secondly, with the arrangement of the invention, the distance between the electrodes can he effectively reduced to reduce the resistance, thereby reducing the resistance of the reaction tank, so that improve the stability of the electrodes and high current density. Therefore, reducing the distance between electrodes is also the electrode arrangement method used in the invention.
Continuing to refer to FIG. 1 , the anode electrode 22 of the embodiment is adjacent to the isolation unit 30, and the anode electrode 22 may include one or more anode catalysts, such as but not limited to, ruthenium, iridium, titanium, nickel, iron, cobalt, platinum and other metals or comninations of at least any two of the abovementioned materials, the anodic oxidation reaction that can be carried out includes Oxygen Evolution Reaction (OER), Chlorine Evolution Reaction (CER) or Urea Oxidation Reaction (UOR), Oxygen Reduction Reaction, Phenol Oxidation Reaction or Organic Pollutant Oxidation Reaction.
As shown in FIG. 1 again, in the anode electrode 22 of the embodiment of the invention, one or more anode catalysts may be added and disposed on the anode electrode 22 in an appropriate manner, for example but not limited to, physical or chemical adsorption or chemical bonding. Furthermore, the preparation method of the cathode electrode 12 or the anode electrode 22 is, for example but not limited to, a porous electrode of a metal material or a metal modified by coating, chemical deposition, physical deposition, electroplating or chemical plating on the porous electrode material. The metal is the same as the metal used for the abovementioned catalyst, and the porous electrode material can be a conductive composite of polytetrafluoroethylene, polypropylene, polyethylene mixed with a conductor or a porous carbon material.
As shown in FIG. 1 , the anode electrode 22 of the invention can provide the function of anode electrolytic reaction, and the anode chamber 20 thereof can have one or more input ports and one or more output ports to provide anode reactants and anode electrolyte solution entering into and exiting and staying, wherein, when the anode electrolyte is liquid, the anode electrode 22 can be split-flow the gas-liquid of the anode electrolytic reaction. Therefore, the products of different phases produced after the anode electrolytic reaction can be directly separated from respective output ports leaving out the anode chamber 20, which owns the effect of reducing the cost of the separated product and improving the purity of the products. Without limitation, the anode electrode 22 may also be positioned on the boundary of the space (anode chamber 20), so that the anode reactant and anode electrolyte may enter the anode chamber 20 together.
Please refer to FIG. 1 again, the anode chamber 20 includes an anode input port 23 and an anode output port 25. The anode chamber 20 is connected to the liquid (gas) feeding pipes, components, equipment or devices through the anode input port 23. The anode input port 23 and the anode output port 25 are respectively located at the appropriate positions of the anode chamber 20, in order to externally connect other elements, structures, equipment or devices, which are not limited to the figures, and the anode discharge 26 of the anode electrolyte and anode product may exit out the anode chamber 20 from the anode output port 25, which may include gas-liquid two-phasic anode electrolyte and anode product, wherein the anode product may be a single or mixed product.
As shown in FIG. 1 , the cathode electrode and anode electrode of the invention are porous electrodes or gas diffusion electrodes, and the materials of the porous electrodes comprise polytetrafluoroethylene, polypropylene, polyethylene and conductive materials mixed with conductors, conductive polymer, porous carbon material, and porous metal material, wherein metal is modified on the porous material by chemical deposition method, physical deposition method, electroplating method, and chemical plating method to become porous metal material, or comninations of at least any two of materials selected from groups described above to serve as the porous electrode. Secondly, the metal consists of vanadium, chromium, manganese, iron, cobalt, nickel, copper, tin, zirconium, niobium, molybdenum, ruthenium, rhodium, palladium, silver, cadmium, hafnium, tantalum, tungsten, rhenium, iridium, platinum, gold, aluminum, indium, titanium, lead, bismuth, antimony, tellurium, lanthanum, cerium, neodymium, and comninations of at least any two of foregoing substances.
Please refer to FIG. 1 , the cathode electrode 12, the isolation unit 30 and the anode electrode 22 of the invention extend substantially on any section of the body of the electrochemical equipment 2 for reducing carbon dioxide. in addition, the positions of the cathode gas input port 13, cathode gas output port 15, anode input port 23, anode output port 25, cathode electrolyte input port 33, and liquid output port 35 on the body in FIG. 1 are only used for convenience of description, which can be adjusted according to the actual application, and is not used to limit, the relative positions of the chambers and ports of the invention.
Please refer to FIG. 1 , in the electrolytic reaction of the invention, an anode feed 24 (liquid) comprising an anode electrolyte and an anode reactant contacts the anode electrode 22 and electrolyzes to produce an anode product, such as but not limited to, oxygen, carbon dioxide, nitrogen, chlorine, or comninations of at least any two of foregoing substances.
Still as shown in FIG. 1 , in the electrolytic reaction of the invention, the carbon dioxide will produce different carbon dioxide reduction products through electrical reduction, and the design of the invention can be based on different physical and chemical properties, so that the cathode products can be formed at the gas; liquid phase interface, in order to achieve the split-flow effect.
FIG. 2 illustrates the schematic cross-sectional view of a second embodiment of the electrochemical equipment and system thereof for reducing carbon dioxide according to the invention. FIG. 1 is different from FIG. 2 in that the electrochemical equipment 4 for reducing carbon dioxide in FIG. 2 includes the following respectively: a cathode chamber 10, a cathode electrode 12, a cathode electrolyte chamber 11, an isolation unit 30, an anode electrolyte chamber 40, an anode electrode 22, and an anode chamber 21.
Still please refer to FIG. 2 , the cathode chamber 10 owns a cathode gas input port 13 and a cathode gas output port 15, both of them are located at appropriate positions in the cathode chamber 10 for external connection to other elements, structures, equipment or devices without being limited as shown in the FIG. 2 , and the cathode chamber 10 can be connected to the pipes, components, equipment or devices for the input gas feed through the cathode gas input port 13.
As shown in FIG. 2 , in the cathode chamber 10 of the present embodiment, the carbon dioxide is entered into the cathode chamber 10 from the cathode gas input port 13, and the carbon dioxide herein can be the gas including carbon dioxide. The concentration of carbon dioxide gas may be 0.01 to 100 of volume percentage as the example but not limited to it, and the gas used for diluting can be nitrogen, argon etc. Herein, the phase of the carbon dioxide gas feed 14 is mainly the gas phase. The cathode gas input port 13 of the invention is mainly used for feeding the cathode gas. In actual operation, a very small amount of moisture may he mixed in the cathode feeding gas. But this is not the core technology claimed by the invention. Therefore, about the cathode gas feed in the cathode gas input port 13, it is not limited that the cathode gas feed of the invention must not contain liquid phase moisture, but the carbon dioxide gas feed of the invention, which is entered into the reduction equipment in the gas phase for electrochemical reaction. Secondly, in the electrolytic reaction, the carbon dioxide entering into the cathode chamber 10 from the cathode gas input port 13 can be reduced to carbon monoxide on the cathode electrode 12, or further including other product gases, such as methane, ethane, ethylene, formic acid, methanol or ethanol and comninations of at least any two of foregoing substances, and carbon monoxide, other gas products, unreacted gases, unfinished carbon. dioxide, or some or all of the abovementioed gases, which can be used to form a mixed gas 16 with carbon dioxide reduction products.
Still as shown in FIG. 2 , in the cathode chamber 10 of this embodiment, a mixed gas 16 of carbon dioxide reduction product is produced, and the mixed gas 16 can be leaved out the cathode chamber 10 through the cathode gas output port 15. The gas output port 15 can be connected to the external pipe, so that the mixed gas 16 with the carbon dioxide reduction product is sent to other units, equipment or devices through the pipe fir further processing. The mixed gas 16 with carbon dioxide reduction product of the invention is also mainly based on the gas phase discharge of the mixed gas, but it is not limited by the existence of only the gas phase. In actual operation, it may be due to operating conditions or environment and other parameters, and very little liquid moisture exists in the mixed gas 16 with carbon dioxide reduction product, or when the water vapor and moisture reach a gas-liquid equilibrium, both will appear in the mixed gas 16 with carbon dioxide reduction product. Therefore, the cathode chamber 10 of the invention is set as a space to provide the cathode electrolytic reaction, and the invention can own one or more input ports and one or more output ports to provide the cathode reactants and the cathode electrolyte inlet, outlet and stay.
Still continuing to refer to FIG. 2 , the cathode electrode 12 is disposed between the cathode chamber 10 and the cathode electrolyte chamber 11. In an embodiment of the invention, the cathode electrode 12 facilitates the reduction reaction of the gas-phase reactant carbon dioxide, such as a porous electrode. Secondly, the cathode electrode 12 may further include one or more cathode catalysts, such as gold, silver, zinc, copper, bismuth, tin, or other metals or metal single-atom catalysts or communications of at least any two of foregoing substances, provided in a suitable manner on the cathode electrode 12, for example but not limited to, physical or chemical adsorption, or chemical bonding is used for connection.
As shown in FIG. 2 again, the cathode electrode 12 is disposed between the cathode chamber 10 and the cathode electrolyte chamber 11, that is, the cathode electrolyte chamber 11 is adjacent to the cathode chamber 10 with the cathode electrode 12. The cathode electrode 12 can be used as the gas-liquid separation interface to conduct the split-flow of gas-phase and liquid-phase carbon dioxide reduction product produced by the cathode electrolytic reaction. Thus, the cathode electrode 12 is allowed the cathode electrolyte chamber 11 and the cathode chamber 10 to be provided with respective input ports and output ports. Therefore, the products of different phases produced from the cathode electrolytic reaction can be directly separated from the cathode chamber 10 through the respective output ports, which owns the effect of reducing the cost of the separated products and improving the purity of the products.
Continuing to refer to FIG. 2 , the cathode electrolyte chamber 11 includes a cathode electrolyte input port 33 and a liquid output port 35, and the cathode electrolyte input port 33 and the liquid output port 35 are located at the appropriate positions in the cathode electrolyte chamber 11, respectively, the cathode electrolyte chamber 11 is adjacent to the cathode electrolyte chamber 10 with the cathode electrode 12 in order to connect other elements, structures, equipment or devices to the outside without being limited by the figures. The cathode electrolyte feed 34 is entered into the cathode electrolyte chamber 11 from the cathode electrolyte input port 33, and is leaveed out the cathode electrolyte chamber 11 through the liquid output port 35 after participating in the reaction. The cathode electrolyte feed 34 is a liquid phase, and the liquid product 36 includes cathode electrolyte and cathode electrolyte products, alcohols, acids and urea, with low carbon numbers, wherein the cathode electrolyte products can be single or mixed products.
Continuing to refer to FIG. 2 , the cathode electrolyte used in the cathode electrolyte chamber 11 may include the cathode electrolyte described below, for example but not limited to, sodium hydroxide, sodium bromide, sodium bicarbonate, and sodium sulfate, sodium phosphate, sodium hydrogen phosphate, lithium hydroxide, lithium bromide, lithium hydrogen carbonate, lithium sulfate, lithium phosphate, lithium hydrogen phosphate, potassium hydroxide, potassium bromide, potassium hydrogen carbonate, potassium sulfate, potassium phosphate, potassium hydrogen phosphate, or comninations of at least any two of foregoing electrolytes. The anode electrolytes such as, but not limited to, sodium hydroxide, sodium bromide, sodium bicarbonate, sodium sulfate, sodium phosphate, sodium hydrogen phosphate, lithium hydroxide, lithium bromide, lithium bicarbonate, lithium sulfate, lithium phosphate, lithium hydrogen phosphate, potassium hydroxide, potassium bromide, potassium bicarbonate, potassium sulfate, potassium phosphate, potassium hydrogen phosphate, urea, potassium chloride, sodium chloride, or comninations of at least any two of foregoing substances. The solid-state electrolyte can include polymer solid-state electrolytes, inorganic solid-state electrolytes, organic and inorganic composite solid-state electrolytes, and colloidal electrolytes etc.
As shown in FIG. 2 , the isolation unit 30 of this embodiment is adjacent to the cathode electrolyte chamber 11. The isolation unit 30 can be a porous ceramic, a bipolar membrane, an anion, or a cation semipermeable membrane. According to the abovementioned description, when the carbon dioxide feed is carbon dioxide gas, the problem of poor solubility of carbon dioxide in the common cathode electrolyte can be avoided, thereby increasing the concentration of reactants and thus improving the reactivity (high current density). Mainly because the function of the gas diffusion electrode is to increase the concentration of reactants, thereby increasing the reactivity (high current density). Secondly, with the arrangement of the invention, the distance between the electrodes can be effectively reduced to reduce the resistance, thereby reducing the resistance of the reaction tank, in order to improve the stability of the electrodes and high current density. Therefore, reducing the distance between electrodes is also the electrode arrangement method used in the invention.
As shown in FIG. 2 , the isolation unit 30 is disposed between the cathode electrolyte chamber 11 and the anode electrolyte chamber 40, so that the isolation unit 30 is adjacent to the anode electrolyte chamber 40, that is, the anode electrolyte chamber 40 is isolated for isolation unit 30 adjacent to the cathode electrolyte chamber 11. The invention isolates the cathode electrolyte chamber 11 and the anodic electrolysis chamber 40 through the isolation unit 30, so that to isolate the substances in the two chambers to prevent the direct exchange of substances, and at the same time allow the flow of ions to maintain the electrically neutral balance required for the operation of the electrolytic tank.
As shown in FIG. 2 , the anode electrolyte chamber 40 owns an anode electrolyte input port 43 and an anode electrolyte output port 45, and the anode electrolyte chamber 40 is adjacent to the anode chamber 21 and the anode electrode 22. The anode electrolyte feed 44 is entered into the anode electrolyte chamber 40 from the anode electrolyte input port 43, which is becomed anode electrolyte and anode electrolyte liquid product 46 after participating in the reaction, and is leaved out the anode electrolyte chamber 40 from the anode electrolyte output port 45. Therefore, in addition to the cathode chamber 10, the anode chamber 21 also is adopted a split-flow design to directly separate products of different phases, which can not only reduce the cost of separation, but also can improve the purity of the products. According to the abovementioned description, for a few examples of products that are difficult to separate directly, such as the reaction between the alkaline substance produced by the cathode and the remaining CO₂, resulting in product loss, the split-flow design of the invention can effectively separate the products that are difficult to be separated.
Continuing to refer to FIG. 2 , the anode electrode 22 of this embodiment is adjacent to the anode electrolyte chamber 40, and the anode electrode 22 may include one or more anode catalysts, such as but not limited to, ruthenium, iridium, titanium, nickel, iron, cobalt, platinum and other metals or comninations of at least any two of the abovementioned materials, the anodic oxidation reaction that can be carried out includes Oxygen Evolution Reaction (OER), Chlorine Evolution Reaction (CER) or Urea Oxidation Reaction (UOR), Oxygen Reduction Reaction, Phenol Oxidation Reaction or Organic Pollutant Oxidation Reaction.
As shown in FIG. 2 again, in the anode electrode 22 of the embodiment of the invention, one or more anode catalysts may be added and disposed on the anode electrode 22 in an appropriate manner, for example but not limited to, physical or chemical adsorption or chemical bonding. Furthermore, the preparation method of the cathode electrode 12 or the anode electrode 22 is, for example but not limited to, a porous electrode of a metal material or a metal modified by coating, chemical deposition, physical deposition, electroplating or chemical plating on the porous electrode material. The metal is the same as the metal used for the abovementioned catalyst, and the porous electrode material can be a conductive composite of polytetrafluoroethylene, polypropylene, polyethylene mixed with a conductor or a porous carbon material.
As shown in FIG. 2 , the anode electrode 22 of the invention can provide the function of anode electrolytic reaction. The anode electrode 22 is disposed between the anode electrolyte chamber 40 and the anode chamber 21, and can own one or more input ports and one or more output ports to provide anode reactants and anode electrolyte solution entering into and exiting and staying, wherein when the anode electrolyte is liquid, the anode electrode 22 can split-flow the gas-liquid of the anode electrolytic reaction, and the anode electrolyte chamber 40 and anode chamber 21 may each be provided with respective input and output ports. Therefore, the products of different phases produced after the anode electrolytic reaction can be directly separated from respective output ports leaving out the anode chamber 21, which owns the effect of reducing the cost of the separated product and improving the purity of the products. Without limitation, the anode electrode 22 may also be positioned on the boundary of the space (anode chamber 21), so that the anode reactant and anode electrolyte may into enter the anode chamber 21 together.
As shown in FIG. 2 , the anode chamber 21 of the invention owns an anode input port 23 and an anode output port 25, wherein, the anode feed 54 (gas) includes anode gas reactant and the anode discharge 56 includes anode gas product. Please refer to FIG. 2 again, the anode chamber 21 includes an anode input port 23 and an anode output port 25. The anode chamber 21 is connected to the liquid (gas) feeding pipes, components, equipment or devices through the anode input port 23. The anode input port 23 and the anode output port 25 are respectively located at the appropriate positions of the anode chamber 21, so that to externally connect other elements, structures, equipment or devices, which are not limited to the figures, and the anode discharge 26 of the anode electrolyte and anode product may exit the anode chamber 21 from the anode output port 25, which may include gas-liquid two-phasic anode electrolyte and anode product, where the anode product may be a single or mixed product.
In FIG. 1 illustrating the schematic cross-sectional view of a first embodiment of the electrochemical equipment for reducing carbon dioxide according to the invention and FIG. 2 illustrating the schematic cross-sectional view of a second embodiment of the electrochemical equipment for reducing carbon dioxide according to the invention, the cathode electrode and the anode electrode described below are included. The electrode is a porous electrode or a gas diffusion electrode, and the materials of the porous electrodes comprise polytetrafluoroethylene, polypropylene, polyethylene and conductive materials mixed with conductors, conductive polymer, porous carbon material, and porous metal material, wherein metal is modified on the porous material by chemical deposition method, physical deposition method, electroplating method, and chemical plating method to become porous metal material, or comninations of at least any two of foregoing substances described above to serve as the porous electrode. Secondly, the metal consists of vanadium, chromium, manganese, iron, cobalt, nickel, copper, tin, zirconium, niobium, molybdenum, ruthenium, rhodium, palladium, silver, cadmium, hafnium, tantalum, tungsten, rhenium, iridium, platinum, gold, aluminum, indium, titanium, lead, bismuth, antimony, tellurium, lanthanum, cerium, neodymium, and comninations of at least any two of foregoing substances.
In FIG. 1 illustrating the schematic cross-sectional view of a first embodiment of the electrochemical equipment for reducing carbon dioxide according to the invention and FIG. 2 illustrating the schematic cross-sectional view of a second embodiment of the electrochemical equipment fir reducing carbon dioxide according to the invention, the cathode catalysts and anode catalysts described below are included, which may be the metal, metal compound, alloy, carbon compound containing at least one of heteroatoms or metals, or comninations of at least any two of foregoing substances. The metals can be vanadium, chromium, manganese, iron, cobalt, nickel, copper, tin, zirconium, niobium, molybdenum, ruthenium, rhodium, palladium, silver, cadmium, hafnium, tantalum, tungsten, rhenium, iridium, platinum, gold, aluminum, indium, titanium, lead, bismuth, antimony, tellurium, lanthanum, cerium, neodymium or comninations of at least any two of foregoing substances. The metal compounds include organometallic compounds and inorganic metal compounds and encompass metal hedides, metal oxides, metal hydroxides, metal sulfides or metal nitrides. The carbon compound containing at least one of heteroatoms or metals may be nitrogen-containing or sulfur-containing graphite, grapheme, or a structure composed of carbon materials such as carbon tubes and metal atoms.
In FIG. 1 illustrating the schematic cross-sectional view of a first embodiment of the electrochemical equipment for reducing carbon dioxide according to the invention, and FIG. 2 illustrating the schematic cross-sectional view of a second embodiment of the electrochemical equipment for reducing carbon dioxide according to the invention, the cathode electrolyte chamber of FIG. 1 as well as the cathode electrolyte chamber or the anode electrolyte chamber of FIG. 2 are included. The abovementioned cathode electrolyte chamber and the anode electrolyte chamber serve as the place for providing the conductive substance to provide electrical conduction, which may be a space allowing electrolyte in and out and pass or stay, it is also possible to allow a solid-state electrolyte to be placed or filled there between, or to include both solid- and liquid-phase electrolytes. Under the conditions be able to provide the inlet and outlet and stay of electrolyte, the abovementioned cathode electrolyte chamber and anode electrolyte chamber can have one or more electrolyte input ports, and one or more electrolyte output ports. Secondly, the invention can include one or more cathode electrolyte chambers and an anode electrolyte chamber, and the cathode electrolyte chamber and the anode electrolyte chamber can be isolated by the isolation unit, so as to isolate the substances in the cathode electrolyte chamber and anode electrolyte chamber, to prevent the direct exchange of substances among the chambers, and at the same time allow the flow of ions to maintain the electrically neutral balance required for the operation of the electrolytic tank.
In FIG. 1 illustrating the schematic cross-sectional view of a first embodiment of the electrochemical equipment for reducing carbon dioxide according to the invention, and FIG. 2 illustrating the schematic cross-sectional view of a second embodiment of the electrochemical equipment for reducing carbon dioxide according to the invention, the system of electrochemical equipment for reducing carbon dioxide according to the invention includes a plurality of same or different electrochemical equipment for reducing carbon dioxide, and different electrochemical equipment for reducing carbon dioxide refers to the cathode chamber, the anode chamber and the electrolyte chambers shown in FIG. 1 and FIG. 2 can own different modalities. In FIG. 1 , the anode electrode is arranged on the boundary of the anode chamber space, so that the anode electrode 22 can be closed to the isolation unit 30 and the distance between the cathode electrode 12 and the anode electrode 22 is shortened, which is beneficial to the reaction.
FIG. 3 and FIG. 4 illustrate the block diagram of a first embodiment and a second embodiment of the system comprising the electrochemical equipment for reducing carbon dioxide according to the invention, respectively. Please refer to FIG. 1 and FIG. 3 , at the same time, the system including the electrochemical equipment for reducing carbon dioxide according to the invention can be implemented by connecting a plurality (only two are shown in the Figure) of electrochemical equipment 2 in series for reducing carbon dioxide. The products outputted from the port can be used as the feed for the next connected electrochemical equipment 2 for reducing carbon dioxide. Please refer to FIG. 1 and FIG. 4 , at the same time, the system including the electrochemical equipment for reducing carbon dioxide can be implemented by connecting a plurality (only two are shown in the Figure) of electrochemical equipment 2 in parallel for reducing carbon dioxide. The feed enters into the electrochemical equipment 2 for reducing carbon dioxide through each input port, and the product or discharge (not shown in the Figure) existing out from the output ports of the electrochemical equipment 2 for reducing carbon dioxide is sent to the subsequent unit (not shown in the Figure) for further processing.
FIG. 5 and FIG. 6 illustrate the block diagram of a first embodiment and a second embodiment of the system comprising the electrochemical equipment for reducing carbon dioxide according to the invention, respectively. Please refer to FIG. 2 and FIG. 5 , at the same time, the system including the electrochemical equipment for reducing carbon dioxide according to the invention can be implemented by connecting a plurality (only two are shown in the Figure) of electrochemical equipment 4 in series for reducing carbon dioxide. The products outputted from the port can be used as the feed for the next connected electrochemical equipment 4 for reducing carbon dioxide. Please refer to FIG. 2 and FIG. 6 , at the same time, the system including the electrochemical equipment for reducing carbon dioxide can be implemented by connecting a plurality (only two are shown in the Figure) of electrochemical equipment 4 in parallel for reducing carbon dioxide. The feed enters into the electrochemical equipment 4 for reducing carbon dioxide through each input port, and the product or discharge (not shown in the Figure) existing from the output ports of the electrochemical equipment 4 for reducing carbon dioxide is sent to the subsequent unit (not shown in the Figure) for further processing. In other words, the electrochemical equipment system for reducing carbon dioxide in the invention includes a plurality of electrochemical equipment for reducing carbon dioxide connected to each other in series connection method or in parallel connection method, or comninations of at least any two in series and in parallel.
Summarized from the abovementioned description, the electrochemical equipment for reducing carbon dioxide according to the invention comprises: a cathode chamber comprising a cathode gas input port and a cathode gas output port, wherein the carbon dioxide gas feed enters into the cathode chamber from the cathode gas input port, the mixed liquid with carbon dioxide reduction product leaves out the cathode chamber from the cathode gas output port; a cathode electrolyte chamber, which allows the cathode electrolyte to pass or stay, wherein the cathode electrode is arranged between the cathode chamber and the cathode electrolyte chamber, the cathode electrode reduces the carbon dioxide gas feed to form a mixed liquid with carbon dioxide reduction product, a cathode electrolyte chamber is adjacent to the cathode chamber with a cathode electrode; an isolation unit; and an anode chamber, the isolation unit separates into the anode chamber and the cathode electrolyte chamber, the anode chamber includes an anode input port, an anode output port, and an anode electrode, the anode chamber is attached to the isolation unit with the anode electrode, and the isolation unit is attached to the cathode electrolyte chamber, wherein the anode feed enters into the anode chamber from the anode input port to contact the anode electrode, the anode feed is liquid, and the anode discharge exits out the anode chamber from the anode output port.
In addition, the electrochemical equipment for reducing carbon dioxide according to the invention comprises: a cathode chamber comprising a cathode gas input port and a cathode gas output port, wherein the carbon dioxide gas feed enters into the cathode chamber from the cathode gas input port, the mixed gas with carbon dioxide reduction product leaves out the cathode chamber from the cathode gas output port; a cathode electrolyte chamber, which allows the cathode electrolyte to pass or stay, wherein the cathode electrode is arranged between the cathode chamber and the cathode electrolyte chamber, the cathode electrode reduces the carbon dioxide gas feed to form a mixed liquid with carbon dioxide reduction product, a cathode electrolyte chamber is adjacent to the cathode chamber with a cathode electrode; an isolation unit; and an anode electrolyte chamber, the isolation unit separates the anode electrolyte chamber and the cathode electrolyte chamber, the anode electrolyte chamber includes an anode input port, and an anode electrolyte output port, wherein the anode electrolyte feed enters into the anode electrolyte chamber from the anode electrolyte input port, and the anode electrolyte discharge exits out the anode electrolyte chamber from the anode electrolyte output port; and an anode chamber, including an anode input port, an anode output port and an anode electrode, the anode electrode is disposed between the anode chamber and the anode electrolyte chamber, and the anode electrolyte chamber is disposed between the isolation unit and the anode electrode, wherein the anode feed enters into the anode chamber from the anode input port to contact the anode electrode, the anode feed is gas, and the anode discharge exits out the anode chamber from the anode output port.
The industrial advantage of the electrochemical equipment for reducing carbon dioxide of the invention is that the electrode configuration method of the invention can effectively reduce the distance between the electrodes, thereby reducing the resistance of the reaction tank, and achieving the effect of reducing the resistance, improving the stability and high current density of the electrode. In addition, the industrial advantage of the electrochemical equipment for reducing carbon dioxide of the invention is that when the feed of carbon dioxide is carbon dioxide gas, the problem of poor solubility of carbon dioxide in common cathode electrolyte will be avoided, and pass through the electrode to act as carbon dioxide gas. In the case of a cathode/anode electrode, it can increase the concentration of reactants, which can further increase the reactivity due to the high current density at this time. In addition, the biggest advantage of this technology is that the cathode and anode chambers can each adopt the form of split-flow to directly separate into the products of different phases, which can not only reduce the cost of separation, but also can improve the purity of the products.
It is understood that various other modifications will be apparent to and can be readily made by those skilled in the art without departing from the scope and spirit of this invention. Accordingly, it is not intended that the scope of the claims appended hereto be limited to the description as set forth herein, but rather that the claims be construed as encompassing all the features of patentable novelty that reside in the present invention, including all features that would be treated as equivalents thereof by those skilled in the art to which this invention pertains.

Claims

1. An electrochemical equipment and system thereof for reducing carbon dioxide, comprising:

a cathode chamber, comprising a cathode gas input port and a cathode gas output port, wherein a carbon dioxide gas feed entering into said cathode chamber from said cathode gas input port, a mixed gas with a carbon dioxide reduction product leaving out said cathode chamber from said cathode gas output port;

a cathode electrolyte chamber, allowing said cathode electrolyte to pass or stay, wherein said cathode electrode being arranged between said cathode chamber and said cathode electrolyte chamber, said cathode electrode reducing said carbon dioxide gas feed to form a mixed liquid with said carbon dioxide reduction product, said cathode electrolyte chamber is adjacent to said cathode chamber with a cathode electrode;

an isolation unit; and

an anode chamber, said isolation unit separating said anode chamber and said cathode electrolyte chamber, said anode chamber including an anode input port, an anode output port and an anode electrode, said anode chamber being attached to said isolation unit with said anode electrode, and said isolation unit being attached to said cathode electrolyte chamber, wherein said anode feed entering into said anode chamber from said anode input port to contact said anode electrode, said anode feed being liquid, and an anode discharge exits out said anode chamber from said anode output port.

2. An electrochemical equipment and system thereof for reducing carbon dioxide comprising:

a cathode chamber, comprising a cathode gas input port, and a cathode gas output port, wherein said carbon dioxide gas feed entering into said cathode chamber from said cathode gas input port, a mixed gas with a carbon dioxide reduction product leaving out said cathode chamber from said cathode gas output port;

a cathode electrolyte chamber, allowing said cathode electrolyte to pass or stay, wherein said cathode electrode being arranged between said cathode chamber and said cathode electrolyte chamber, said cathode electrode reducing said carbon dioxide gas feed to form a mixed gas with said carbon dioxide reduction product, said cathode electrolyte chamber being adjacent to said cathode chamber with said cathode electrode;

an isolation unit;

an anode electrolyte chamber, said isolation unit separating into said anode electrolyte chamber and said cathode electrolyte chamber, said anode electrolyte chamber having an anode electrolyte input port and an anode electrolyte output port, wherein said anode electrolyte feed entering into said anode electrolyte chamber from said anode electrolyte input port, and said anode electrolyte discharge leaving out said anode electrolyte chamber from said anode electrolyte output port; and

an anode chamber, comprising an anode input port, an anode output port, and an anode electrode, said anode electrode being arranged between said anode chamber and said anode electrolyte chamber, and said anode electrolyte chamber being interposed between said isolation unit and said anode electrode, wherein said anode feed entering into said anode chamber from said anode input port to contact said anode electrode, said anode feed being gas, and said anode output exits out said anode chamber from said anode output port.

3. The equipment according to claim 1, wherein said isolation unit is selected from the group of a porous ceramic, a bipolar membrane, an anion semipermeable membrane, and a cation semipermeable membrane.

4. The equipment according to claim 1, further comprises a catalyst disposed on said cathode electrode and at least one of said anode electrode, wherein said catalyst is selected from the group consisting of metal, metal compound, alloy, carbon compound containing heteroatoms, and containing at least one metal heterocyclic compound, and comninations of at least any two of foregoing substances.

5. The equipment according to claim 4, wherein said metal is selected from the group of vanadium, chromium, manganese, iron, cobalt, nickel, copper, tin, zirconium, niobium, molybdenum, ruthenium, rhodium, palladium, silver, cadmium, hafnium, tantalum, tungsten, rhenium, iridium, platinum, gold, aluminum, indium, titanium, lead, bismuth, antimony, tellurium, lanthanum, cerium, neodymium and comninations of at least any two of foregoing substances.

6. The equipment according to claim 4, wherein said metal compound is selected from the group consisting of metal halides, metal oxides, metal hydroxides, metal sulfides, metal nitrides, and comninations of at least any two of foregoing substances.

7. The equipment according to claim 4, wherein said carbon compound of at least one of said heteroatom-containing and metal-containing heterocyclic compound is selected from the group consisting of nitrogen-containing, sulfur-containing graphite, graphene, carbon tube, and metal atoms.

8. The equipment according to claim 1, wherein said mixed gas having said carbon dioxide reduction products is selected from the group consisting of hydrogen, carbon dioxide, carbon monoxide, methane, ethane, ethylene, and comninations of at least any two of foregoing substances.

9. The equipment according to claim 1, said anode feed comprises an anode reactant and an anode electrolyte, wherein the anode electrolyte is selected from the group consisting of sodium hydroxide, sodium bromide, sodium bicarbonate, sodium sulfate, sodium phosphate, sodium hydrogen phosphate, lithium hydroxide, lithium bromide, lithium bicarbonate, lithium sulfate, lithium phosphate, lithium hydrogen phosphate, potassium hydroxide, potassium bromide, potassium bicarbonate, potassium sulfate, potassium phosphate, potassium hydrogen phosphate, urea, potassium chloride, sodium chloride, and aqueous solutions of comninations of at least any two of foregoing substances.

10. The equipment according to claim 9, wherein said anode discharge comprises an anode product and said anode electrolyte, wherein said anode product is selected from the group consisting of oxygen, carbon dioxide, nitrogen, chlorine, and comninations of at least any two of foregoing substances.

11. The equipment according to claim 2, wherein the anode electrolyte is selected from the group consisting of sodium hydroxide, sodium bromide, sodium bicarbonate, sodium sulfate, sodium phosphate, sodium hydrogen phosphate, lithium hydroxide, lithium bromide, lithium bicarbonate, lithium sulfate, lithium phosphate, lithium hydrogen phosphate, potassium hydroxide, potassium bromide, potassium bicarbonate, potassium sulfate, potassium phosphate, potassium hydrogen phosphate, urea, potassium chloride, sodium chloride, and aqueous solutions of comninations of at least any two of foregoing substances.

12. The equipment according to claim 2, wherein the anode discharge is selected from the group consisting of oxygen, carbon dioxide, nitrogen, chlorine, and comninations of at least any two of foregoing substances.

13. The equipment according to claim 2, said anode electrolyte chamber allows said anode electrolyte to pass through or said solid-state electrolyte is disposed therein, wherein said anode electrolyte is selected from the group consisting of sodium hydroxide, sodium bromide, sodium bicarbonate, sodium sulfate, sodium phosphate, sodium hydrogen phosphate, lithium hydroxide, lithium bromide, lithium bicarbonate, lithium sulfate, lithium phosphate, lithium hydrogen phosphate, potassium hydroxide, potassium bromide, potassium bicarbonate, potassium sulfate, potassium phosphate, potassium hydrogen phosphate, urea, potassium chloride, sodium chloride, and aqueous solutions of comninations of at least any two of foregoing substances.

14. The equipment according to claim 1, the cathode electrolyte is selected from the group consisting of a cathode electrolyte and a solid-state electrolyte, wherein said cathode electrolyte is selected from the group consisting of sodium hydroxide, sodium bromide, sodium bicarbonate, sodium sulfate, sodium phosphate, sodium hydrogen phosphate, lithium hydroxide, lithium bromide, lithium bicarbonate, lithium sulfate, lithium phosphate, lithium hydrogen phosphate, potassium hydroxide, potassium bromide, potassium bicarbonate, potassium sulfate, potassium phosphate, potassium hydrogen phosphate, and electrolytes in comninations of at least any two of foregoing substances.

15. The equipment according to claim 14, wherein said solid-state electrolyte is selected from the group consisting of polymer solid-state electrolytes, inorganic solid-state electrolytes, organic and inorganic composite solid-state electrolytes, colloidal electrolytes, and comninations of at least any two of foregoing substances.

16. The equipment according to claim 1, wherein said cathode electrode comprises a gas diffusion electrode.

17. The equipment according to claim 1, wherein at least one of said cathode electrode and said anode electrode is a porous electrode, and one material of said porous electrode is selected from the group consisting of polytetrafluoroethylene, polypropylene, polyethylene and conductive materials mixed with conductors, conductive polymer, porous carbon material, and porous metal material, wherein a metal being modified on said porous material by a chemical deposition method, a physical deposition method, an electroplating method, and a chemical plating method to become said porous metal material, and comninations of at least any two of foregoing substances.

18. The equipment according to claim 17, wherein said metal is selected from the group consisting of vanadium, chromium, manganese, iron, cobalt, nickel, copper, tin, zirconium, niobium, molybdenum, ruthenium, rhodium, palladium, silver, cadmium, hafnium, tantalum, tungsten, rhenium, iridium, platinum, gold, aluminum, indium, titanium, lead, bismuth, antimony, tellurium, lanthanum, cerium, neodymium, and comninations of at least any two of foregoing substances.

19. The equipment according to claim 1, comprises a plurality of electrochemical equipment for reducing carbon dioxide connected to each other in series connection or in parallel connection, or comninations of at least any two in series connection and in parallel connection.

20. The equipment according to claim 2, wherein said isolation unit is selected from the group of a porous ceramic, a bipolar membrane, an anion semipermeable membrane, and a cation semipermeable membrane.

21. The equipment according to claim 2, further comprises a catalyst disposed on said cathode electrode and at least one of said anode electrode, wherein said catalyst is selected from the group consisting of metal, metal compound, alloy, carbon compound containing heteroatoms, and containing at least one metal heterocyclic compound, and comninations of at least any two of foregoing substances.

22. The equipment according to claim 23, wherein said metal is selected from the group of vanadium, chromium, manganese, iron, cobalt, nickel, copper, tin, zirconium, niobium, molybdenum, ruthenium, rhodium, palladium, silver, cadmium, hafnium, tantalum, tungsten, rhenium, iridium, platinum, gold, aluminum, indium, titanium, lead, bismuth, antimony, tellurium, lanthanum, cerium, neodymium and comninations of at least any two of foregoing substances.

23. The equipment according to claim 23, wherein said metal compound is selected from the group consisting of metal halides, metal oxides, metal hydroxides, metal sulfides, metal nitrides, and comninations of at least any two of foregoing substances.

24. The equipment according to claim 23, wherein said carbon compound of at least one of said heteroatom-containing and metal-containing heterocyclic compound is selected from the group consisting of nitrogen-containing, sulfur-containing graphite, graphene, carbon tube, and metal atoms.

25. The equipment according to claim 2, wherein said mixed gas having said carbon dioxide reduction products is selected from the group consisting of hydrogen, carbon dioxide, carbon monoxide, methane, ethane, ethylene, and comninations of at least any two of foregoing substances.

26. The equipment according to claim 2, the cathode electrolyte is selected from the group consisting of a cathode electrolyte and a solid-state electrolyte, wherein said cathode electrolyte is selected from the group consisting of sodium hydroxide, sodium bromide, sodium bicarbonate, sodium sulfate, sodium phosphate, sodium hydrogen phosphate, lithium hydroxide, lithium bromide, lithium bicarbonate, lithium sulfate, lithium phosphate, lithium hydrogen phosphate, potassium hydroxide, potassium bromide, potassium bicarbonate, potassium sulfate, potassium phosphate, potassium hydrogen phosphate, and electrolytes in comninations of at least any two of foregoing substances.

27. The equipment according to claim 26 wherein said solid-state electrolyte is selected from the group consisting of polymer solid-state electrolytes, inorganic solid-state electrolytes, organic and inorganic composite solid-state electrolytes, colloidal electrolytes, and comninations of at least any two of foregoing substances.

28. The equipment according to claim 2, wherein said cathode electrode comprises a gas diffusion electrode.

29. The equipment according to claim 2, wherein at least one of said cathode electrode and said anode electrode is a porous electrode, and one material of said porous electrode is selected from the group consisting of polytetrafluoroethylene, polypropylene, polyethylene and conductive materials mixed with conductors, conductive polymer, porous carbon material, and porous metal material, wherein a metal being modified on said porous material by a chemical deposition method, a physical deposition method, an electroplating method, and a chemical plating method to become said porous metal material, and comninations of at least any two of foregoing substances.

30. The equipment according to claim 29, wherein said metal is selected from the group consisting of vanadium, chromium, manganese, iron, cobalt, nickel, copper, tin, zirconium, niobium, molybdenum, ruthenium, rhodium, palladium, silver, cadmium, hafnium, tantalum, tungsten, rhenium, iridium, platinum, gold, aluminum, indium, titanium, lead, bismuth, antimony, tellurium, lanthanum, cerium, neodymium, and comninations of at least any two of foregoing substances.

31. The equipment according to claim 2, comprises a plurality of electrochemical equipment for reducing carbon dioxide connected to each other in series connection or in parallel connection, or comninations of at least any two in series connection and in parallel connection.