Carbon dioxide electrolyzer module, reduction system for electrolyzing carbon dioxide, and reduction method

Abstract

A carbon dioxide electrolyzer module, a reduction system for electrolyzing carbon dioxide, and a reduction method, wherein the carbon dioxide electrolyzer module comprises: a stack assembly, formed by stacking individual stack sets for electrolyzing a cathode reactant and an anode reactant to produce a reduction product. The individual stack set comprises: an ion exchange membrane, having a plurality of membrane pores; an anode flow channel plate, having first through-holes and anode flow channels; a cathode flow channel plate, having second through-holes corresponding to the first through-holes and cathode flow channels; an anode catalyst; a cathode catalyst; and gas barrier gaskets; a first end plate; a second end plate; a first insulation board, having a first insulation board through-hole and a first current collector plate groove corresponding to a first inlet and a first outlet of the first end plate; a second insulation board, having a second insulation board through-hole and a second current collector plate groove corresponding to a second inlet and a second outlet of the second end plate; and two current collector plates. Accordingly, it is allowed for low energy consumption required in the electrolysis of carbon dioxide, achieving the effect of saving energy.

Description

TECHNICAL FIELD

[0001] The present invention relates to the technical field of hydrocarbon production, and in particular to a carbon dioxide electrolyzer module for producing a hydrocarbon compound via electrolysis, a reduction system for electrolyzing carbon dioxide, and a reduction method.BACKGROUND

[0002] Currently, about 80% of energy demands across the world are met through the combustion of fossil fuels. The combustion process causes the emission of about 34 billion tons of carbon dioxide into the atmosphere annually, wherein most of carbon dioxide is directly released into the atmosphere. Carbon dioxide is a greenhouse gas that imposes detrimental effects on the atmosphere and climate and further contributes to global warming and ocean acidification.

[0003] In terms of carbon dioxide reuse, the industry currently focuses on converting carbon dioxide into other energy sources. Taking the reduction of carbon dioxide to form carbon monoxide or other hydrocarbons as an example, carbon dioxide is mostly reduced via electrocatalysis. However, this method faces problems of carbon dioxide diffusion capacity, conversion rate, product separation and purification, as well as the drawback of complicated steps.SUMMARY

[0004] The present invention provides a carbon dioxide electrolyzer module, a reduction system for electrolyzing carbon dioxide, and a reduction method. Its purpose is to utilize a carbon dioxide electrolyzer module having a novelstructure for electrolysis reactions.

[0005] A carbon dioxide electrolyzer module of the present invention comprises: a stack assembly, formed by stacking at least two individual stack sets for electrolyzing a cathode reactant and an anode reactant to produce a reduction product; wherein the individual stack set further comprises: an ion exchange membrane, having a plurality of membrane pores and having a first surface and a second surface disposed opposite to each other; an anode flow channel plate, disposed on the first surface side of the ion exchange membrane, the anode flow channel plate having at least four first through-holes and an anode flow channel; a cathode flow channel plate, disposed on the second surface side of the ion exchange membrane, the cathode flow channel plate having at least four second through-holes corresponding to the at least four first through-holes and a cathode flow channel, wherein the anode flow channel plate and the cathode flow channel plate are combined in a manner in which the anode flow channel and the cathode flow channel are arranged facing each other; an anode catalyst, disposed in a first accommodating space between the ion exchange membrane and the anode flow channel plate, the first accommodating space having a first internal space for allowing the anode reactant to flow; a cathode catalyst, disposed in a second accommodating space between the ion exchange membrane and the cathode flow channel plate, the second accommodating space having a second internal space for allowing the cathode reactant to flow; and at least two gas barrier gaskets, disposed between the anode flow channel plate and the ion exchange membrane, and between the cathode flow channel plate and the ion exchange membrane, respectively, and having at least two third through-holes corresponding to the at least four first through-holes, for forming communication channels, so that the cathode reactant and the anode reactant are in contact with the anode catalyst and the cathode catalyst through the communication channels, respectively; a first end plate, disposed on one side of the stack assembly, and having a first inlet and a first outlet; a second end plate, disposed on the other side of the stack assembly, such that the stack assembly is sandwiched between the first end plate and the second end plate, the second end plate having a second inlet and a second outlet; a first insulation board, disposed between the first end plate and the stack assembly, and having a first insulation board through-hole and a first current collector plate groove corresponding to the first inlet and the first outlet; a second insulation board, disposed between the second end plate and the stack assembly, and having a second insulation board through-hole and a second current collector plate groove corresponding to the second inlet and the second outlet; and two current collector plates, disposed in the first current collector plate groove and the second current collector plate groove, respectively, to make the stack assembly conductive.

[0006] In one embodiment of the present invention, the above first end plate has at least one first fixing hole, the second end plate has at least one second fixing hole corresponding to the at least one first fixing hole, and the first end plate and the second end plate are fixed by combining the at least one first fixing hole and the at least one second fixing hole together through at least one first fixing component and at least one second fixing component, so that the first end plate, the second end plate and the stack assembly constitute the carbon dioxide electrolyzer module.

[0007] In one embodiment of the present invention, the above stack assembly further comprises at least one limit groove, the limit groove provided to pass through a limit rod for assisting in fixing the positions of the first end plate, the second end plate, the first insulation board, the second insulation board, the anode flow channel plate and the cathode flow channel plate.

[0008] In one embodiment of the present invention, the above ion exchange membrane is an anionexchange membrane (AEM), a cation exchange membrane, or a bipolar membrane.

[0009] In one embodiment of the present invention, the above anode flow channel plate further comprises an anode flow channel face, concavely provided in the anode flow channel plate, and the anode flow channel is convexly provided on the anode flow channel face.

[0010] In one embodiment of the present invention, the above cathode flow channel plate further comprises a cathode flow channel face, concavely provided in the cathode flow channel plate, and the cathode flow channel is convexly provided on the cathode flow channel face.

[0011] In one embodiment of the present invention, the above anode channel and the cathode channel include, but are not limited to, parallel flow channels, serpentine flow channels, or interdigitated flow channels.

[0012] In one embodiment of the present invention, the above anode catalyst is a gas diffusion electrode (GDE) and comprises an anode catalyst layer and an anode gas diffusion layer, wherein the anode catalyst layer is in contact with the first surface of the ion exchange membrane, and the anode gas diffusion layer is in contact with the anode flow channel of the anode flow channel plate.

[0013] In one embodiment of the present invention, the above anode catalyst is made of, but not limited to, iridium (Ir), nickel (Ni), platinum (Pt), iron (Fe), or an oxide thereof, or a combination thereof.

[0014] In one embodiment of the present invention, the above cathode catalyst is a gas diffusion electrode (GDE) and comprises a cathode catalyst layer and a cathode gas diffusion layer, wherein the cathode catalyst layer is in contact with the second surface of the ion exchange membrane, and the cathode gas diffusion layer is in contact with the cathode flow channel of the cathode flow channel plate.

[0015] In one embodiment of the present invention, the above anode catalyst is made of, but not limited to, copper (Cu), iron (Fe), silver (Ag), cobalt (Co), nickel (Ni), iridium (Ir), platinum (Pt), gold (Au), titanium (Ti), ruthenium (Ru), rhodium (Rh), or a carbide, oxide or carbonitride thereof, or a combination thereof.

[0016] In one embodiment of the present invention, the above at least two gas barrier gaskets each have a thickness, for controlling the height of the first accommodating space and the second accommodating space, and adjusting a compression ratio of the first internal space and the second internal space, respectively.

[0017] In one embodiment of the present invention, the above gas barrier gasket is a gasket made of, but not limited to, a polypropylene (PP), polyamide (PA), acrylonitrile-butadiene-styrene (ABS), polyetherimide (PEI), polyphenylene sulfide (PPS), teflon (PTFE), or polyetheretherketone (PEEK) matrix material.

[0018] In one embodiment of the present invention, the above carbon dioxide electrolyzer module further comprises two sealing gaskets, sealed between the anode flow channel plate and the gas barrier gasket, and between the cathode flow channel plate and the gas barrier gasket, respectively.

[0019] In one embodiment of the present invention, the above first inlet and the first outlet in the first end plate and the second inlet and the second outlet in the second end plate are each provided with a removable adapter, the removable adapter being, but not limited to, an adapter made of a plastic, stainless steel, or metal material.

[0020] In one embodiment of the present invention, the above first inlet and the first outlet in the first end plate are diagonally mirrored with the second inlet and the second outlet in the second end plate.

[0021] The present invention further relates to a reduction system for electrolyzing carbon dioxide, including the carbon dioxide electrolyzer module according to any one of the aforementioned embodiments, and further comprising: a cathode reactant tank, for storing a cathode reactant, wherein the cathode reactant comprises compounds of CO2, H2O, H+, or OH−; a mass flow control unit, in communication with the cathode reactant tank, for receiving the flow rate of the cathode reactant and obtaining a mass flow rate; a pure water tank, for storing a pure water wash liquid for washing the carbon dioxide electrolyzer module; a first fluid multi-port valve, having a first water inlet connected to the mass flow control unit, a second water inlet connected to the pure water tank, and a first water outlet connected to the carbon dioxide electrolyzer module; an electrolyte storage tank, for storing an anode reactant, wherein the anode reactant comprises compounds of Group IA ions, OH−, CO32−, H2O, o PO43−, and in communication with the carbon dioxide electrolyzer module; an electrolyte circulation cooling module, in communication with the carbon dioxide electrolyzer module and the electrolyte storage tank, for cooling the anode reactant reacted in the carbon dioxide electrolyzer module and then injecting the cooled anode reactant into the electrolyte storage tank; a second fluid multi-port valve, having a third water inlet connected to the carbon dioxide electrolyzer module, a second water outlet, and a third water outlet for discharging a reduction product generated after reaction in the carbon dioxide electrolyzer module, or a waste liquid after washing the carbon dioxide electrolyzer module, respectively; a product storage unit, coupled to the second fluid multi-port valve for collecting the reduction product; and a control unit, electrically connected to the mass flow control unit, the first fluid multiport valves, the second fluid multiport valves, and the electrolyte circulation cooling module, for controlling the flow of the cathode reactant and the anode reactant into the carbon dioxide electrolyzer module and producing the reduction product.

[0022] In one embodiment of the present invention, the first inlet in the first end plate is for the inflow of the cathode reactant or the pure water wash liquid, and the first outlet is for the outflow of the reduction product or the waste liquid.

[0023] In one embodiment of the present invention, the above second inlet and the second outlet in the second end plate are for the inflow of the anode reactant and the outflow of the heated anode reactant after the electrolysis reaction, respectively.

[0024] The present invention further relates to a reduction method applicable to the reduction system for electrolyzing carbon dioxide, including the following steps: passing the cathode reactant through the mass flow control unit via the cathode reactant tank, and obtaining the mass flow rate; passing the cathode reactant through the first water inlet of the first fluid multi-port valve into the carbon dioxide electrolyzer module at the mass flow rate via the control unit; passing the anode reactant into the carbon dioxide electrolyzer module via the electrolyte storage tank; electrolyzing the cathode reactant and the anode reactant using the carbon dioxide electrolyzer module to form the reduction product; then collecting the reduction product to the product storage unit via the second water outlet of the second fluid multi-port valve.

[0025] In one embodiment of the present invention, the above reduction method further includes the following steps: when the carbon dioxide electrolyzer module needs cleaning, passing the pure water wash liquid into the carbon dioxide electrolyzer module from the second water inlet of the first fluid multi-port valve via the pure water tank, for cleaning the internal conduits of the carbon dioxide electrolyzer module; next, discharging the waste liquid via the third water outlet of the first fluid multi-port valve.

[0026] In one embodiment of the present invention, the above reduction method further includes the following step: when the heated anode reactant flows out of the carbon dioxide electrolyzer module after the electrolysis reaction, cooling the anode reactant via the electrolyte circulation cooling module, and passing the anode reactant back to the electrolyte storage tank.

[0027] The effects of the present invention are that the carbon dioxide electrolyzer module, the reduction system for electrolyzing carbon dioxide and the reduction method of the present invention use an anode flow channel plate and a cathode flow channel plate, respectively, with an anode catalyst and a cathode catalyst as an anode electrode and a cathode electrode, and use membrane electrode assembly (MEA) technology to effectively reduce the distance between the electrodes and reduce the resistance, improve the stability and the high current density of the electrodes, such that the electrolysis of carbon dioxide requires low energy consumption, allowing for excellent reaction efficiency in the electrolytic reduction of carbon dioxide, and achieving the effect of saving energy.BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG. 1 is a schematic diagram of the carbon dioxide electrolyzer module of the present invention; FIG. 2 is a schematic diagram of an individual stack set in the carbon dioxide electrolyzer module of the present invention;

[0029] FIG. 3 is a block schematic diagram illustrating the functions of the reduction system for electrolyzing carbon dioxide of the present invention;

[0030] FIG. 4 is a schematic diagram of the stacked carbon dioxide electrolyzer modules in the reduction system for electrolyzing carbon dioxide according to the first embodiment of the present invention;

[0031] FIG. 5 is a schematic diagram of the stacked carbon dioxide electrolyzer modules in the reduction system for electrolyzing carbon dioxide according to the second embodiment of the present invention;

[0032] FIG. 6 is a flowchart of the steps of the reduction method applicable to the reduction system for electrolyzing carbon dioxide of the present application.

[0033] Explanation of reference numerals in the accompanying drawings:

[0034] 1 Carbon dioxide electrolyzer module;

[0035] 11 Stack assembly;

[0036] 110 Individual stack set;

[0037] 1101 Ion exchange membrane;

[0038] 1102 Anode flow channel plate;

[0039] 11021 First through-hole;

[0040] 1103 Cathode flow channel plate;

[0041] 11031 Second through-hole;

[0042] 11032 Cathode flow channel;

[0043] 1104 Anode catalyst;

[0044] 1105 Cathode catalyst;

[0045] 11051 Second accommodating space;

[0046] 1106 Gas barrier gasket;

[0047] 12 First end plate;

[0048] 121 First inlet;

[0049] 122 First outlet;

[0050] 13 Second end plate;

[0051] 131 Second inlet;

[0052] 132 Second outlet;

[0053] 14 First insulation board;

[0054] 141 First insulation board through-hole;

[0055] 15 Second insulation board;

[0056] 151 Second insulation board through-hole;

[0057] 152 Second current collector plate groove;

[0058] 16 Current collector plate;

[0059] 3 Reduction system for electrolyzing carbon dioxide;

[0060] 301 Cathode Reactant tank;

[0061] 302 Mass flow control unit;

[0062] 303 Pure water tank;

[0063] 304 First fluid multi-port valve;

[0064] 305 Electrolyte storage tank;

[0065] 306 Electrolyte circulation cooling module;

[0066] 307 Second fluid multi-port valve;

[0067] 308 Product storage unit;

[0068] 309 Control unit;

[0069] S610-S650 Procedure steps.DETAILED DESCRIPTION OF THE INVENTION

[0070] To make the above features and advantages of the present invention more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings. Besides these detailed descriptions, the present invention can also be widely implemented in other embodiments. Any easy substitutions, modifications, or equivalent variations of the described embodiments are included within the scope of the present invention and are subject to the claims. In the illustration of the description, many specific details are provided to give readers a more complete understanding of the present invention; however, the present invention may still be carried out even if some or all of the specific details are omitted. Furthermore, well-known steps or components are not described in detail to avoid unnecessary limitations on the present invention. Identical or similar components in the drawings will be represented by the same or similar reference numerals. It is particularly noted that the drawings are for illustrative purposes only and do not represent the actual size or number of components. Some details may not be fully drawn for the sake of simplicity. Detailed explanations are provided below.

[0071] Referring to FIG. 1, it is a schematic diagram of the carbon dioxide electrolyzer module of the present invention; A carbon dioxide electrolyzer module of the present invention comprises: a stack assembly 11, formed by stacking at least two individual stack sets 110 (FIG. 1 illustrates only a single individual stack set 110) for electrolyzing a cathode reactant and an anode reactant to produce a reduction product; wherein the individual stack set further comprises: an ion exchange membrane 1101, having a plurality of membrane pores and having a first surface and a second surface disposed opposite to each other; an anode flow channel plate 1102, disposed on the first surface side of the ion exchange membrane 1101, the anode flow channel plate 1102 having at least four first through-holes 11021 and an anode flow channel (not illustrated in figures); a cathode flow channel plate 1103, disposed on the second surface side of the ion exchange membrane 1101, the cathode flow channel plate 1103 having at least four second through-holes 11031 corresponding to the at least four first through-holes 11021 and a cathode flow channel 11032, wherein the anode flow channel plate 1102 and the cathode flow channel plate 1103 are combined in a manner in which the anode flow channel and the cathode flow channel 11032 are arranged facing each other; an anode catalyst 1104, disposed in a first accommodating space (not illustrated in figures) between the ion exchange membrane 1101 and the anode flow channel plate 1102, the first accommodating space having a first internal space for allowing the anode reactant to flow; a cathode catalyst 1105, disposed in a second accommodating space 11051 between the ion exchange membrane 1101 and the cathode flow channel plate 1103, the second accommodating space having a second internal space for allowing the cathode reactant to flow; and at least two gas barrier gaskets 1106, disposed between the anode flow channel plate 1102 and the ion exchange membrane 1101, and between the cathode flow channel plate 1103 and the ion exchange membrane 1101, respectively, and having at least two third through-holes corresponding to the at least four first through-holes 11021, for forming communication channels, so that the cathode reactant and the anode reactant are in contact with the anode catalyst 1104 and the cathode catalyst 1105 through the communication channels, respectively; a first end plate 12, disposed on one side of the stack assembly 11, and having a first inlet 121 and a first outlet 122; a second end plate 13, disposed on the other side of the stack assembly 11, such that the stack assembly 11 is sandwiched between the first end plate 12 and the second end plate 13, the second end plate 13 having a second inlet 131 and a second outlet 132; a first insulation board 14, disposed between the first end plate 12 and the stack assembly 11, and having a first insulation board through-hole 141 and a first current collector plate groove (not illustrated in figures) corresponding to the first inlet 121 and the first outlet 122; a second insulation board 15, disposed between the second end plate 13 and the stack assembly 11, and having a second insulation board through-hole 151 and a second current collector plate groove 152 corresponding to the second inlet 131 and the second outlet 132; and two current collector plates 16, disposed in the first current collector plate groove and the second current collector plate groove 152, respectively, for contacting the stack assembly 11.

[0072] In this embodiment, the first end plate 12 has at least one first fixing hole, the second end plate 13 has at least one second fixing hole corresponding to the at least one first fixing hole, and the first end plate 12 and the second end plate 13 are fixed by combining the at least one first fixing hole and the at least one second fixing hole together through at least one first fixing component and at least one second fixing component, so that the first end plate 12, the second end plate 13 and the stack assembly 11 constitute the carbon dioxide electrolyzer module 1.

[0073] In this embodiment, the stack assembly 11 further comprises at least one limit groove, the limit groove provided to pass through a limit rod for assisting in fixing the positions of the first end plate, the second end plate, the first insulation board, the second insulation board, the anode flow channel plate and the cathode flow channel plate. In the operations, the limit groove is located in the center of the two fixing holes. During assembly, a positioning rod is first inserted to fix the position of the stack assembly, and then screws are tightened before the positioning rod is lifted.

[0074] In this embodiment, the ion exchange membrane 1101 is an anion exchange membrane (AEM), a cation exchange membrane, or a bipolar membrane.

[0075] In this embodiment, the anode flow channel plate 1102 further comprises an anode flow channel face, concavely provided on the anode flow channel plate 1102, and the anode flow channel is convexly provided on the anode flow channel face.

[0076] In this embodiment, the cathode flow channel plate 1103 further comprises a cathode flow channel face, concavely provided on the cathode flow channel plate 1103, and the cathode flow channel 11032 is convexly provided on the cathode flow channel face.

[0077] In this embodiment, the anode channel and cathode channel 11032 include, but are not limited to, parallel channels, serpentine channels, or interdigitated channels.

[0078] In this embodiment, the anode catalyst 1104 is a gas diffusion electrode (GDE) and comprises an anode catalyst layer and an anode gas diffusion layer, and the anode catalyst layer is in contact with the first surface of the ion exchange membrane 1101, and the anode gas diffusion layer is in contact with the anode flow channel of the anode flow channel plate 1102.

[0079] In this embodiment, the anode catalyst 1104 is made of, but not limited to, iridium (Ir), nickel (Ni), platinum (Pt), iron (Fe), or an oxide thereof, or a combination thereof.

[0080] Preferably, the anode catalyst 1104 is made of a nickel (Ni), nickel-iron (NiFe), or iridium dioxide (IrO2) material.

[0081] Most preferably, the anode catalyst 1104 is made of an iridium dioxide (IrO2) material.

[0082] In this embodiment, the cathode catalyst 1105 is a gas diffusion electrode (GDE) and comprises a cathode catalyst layer and a cathode gas diffusion layer, and the cathode catalyst layer is in contact with the second surface of the ion exchange membrane 1101, and the cathode gas diffusion layer is in contact with the cathode flow channel 11032 of the cathode flow channel plate 1103.

[0083] In this embodiment, the anode catalyst 1105 is made of, but not limited to, copper (Cu), iron (Fe), silver (Ag), cobalt (Co), nickel (Ni), iridium (Ir), platinum (Pt), gold (Au), titanium (Ti), ruthenium (Ru), rhodium (Rh), or a carbide, oxide or carbonitride thereof, or a combination thereof.

[0084] In this embodiment, the at least two gas barrier gaskets 1106 each have a specific thickness, for controlling the height of the first accommodating space and the second accommodating space 11051, and adjusting a compression ratio of the first internal space and the second internal space.

[0085] In this embodiment, the gas barrier gasket 1106 is a gasket made of, but not limited to, a polypropylene (PP), polyamide (PA), acrylonitrile-butadiene-styrene (ABS), polyetherimide (PEI), polyphenylene sulfide (PPS), teflon (PTFE), or polyetheretherketone (PEEK) matrix material.

[0086] This embodiment further comprises two sealing gaskets, sealed between the anode flow channel plate 1102 and the gas barrier gasket 1106, and between the cathode flow channel plate 1103 and the gas barrier gasket 1106, respectively.

[0087] In this embodiment, the first inlet 121 and the first outlet 122 in the first end plate 12 and the second inlet 131 and the second outlet 132 in the second end plate 13 are each provided with a removable adapter, the removable adapter being, but not limited to, an adapter made of a plastic, stainless steel, or metal material.

[0088] In this embodiment, the first inlet 121 and the first outlet 122 in the first end plate 12 are diagonally mirrored with the second inlet 131 and the second outlet 132 in the second end plate 13.

[0089] Referring to FIG. 2, it is a schematic diagram of an individual stack set in the carbon dioxide electrolyzer module of the present invention. The individual stack set 110 in FIG. 2 is used to electrolyze a cathode reactant and an anode reactant to produce a reduction product; wherein the individual stack set further comprises: an ion exchange membrane 1101, having a plurality of membrane pores and having a first surface and a second surface disposed opposite to each other; an anode flow channel plate 1102, disposed on the first surface side of the ion exchange membrane 1101, the anode flow channel plate 1102 having at least four first through-holes 11021 and an anode flow channel; a cathode flow channel plate 1103, disposed on the second surface side of the ion exchange membrane 1101, the cathode flow channel plate 1103 having at least four second through-holes 11031 corresponding to the at least four first through-holes 11021 and a cathode flow channel 11032, wherein the anode flow channel plate 1102 and the cathode flow channel plate 1103 are combined in a manner in which the anode flow channel and the cathode flow channel 11032 are arranged facing each other; an anode catalyst 1104, disposed in a first accommodating space between the ion exchange membrane 1101 and the anode flow channel plate 1102, the first accommodating space having a first internal space for allowing the anode reactant to flow; a cathode catalyst 1105, disposed in a second accommodating space 11051 between the ion exchange membrane 1101 and the cathode flow channel plate 1103, the second accommodating space having a second internal space for allowing the cathode reactant to flow; and at least two gas barrier gaskets 1106, disposed between the anode flow channel plate 1102 and the ion exchange membrane 1101, and between the cathode flow channel plate 1103 and the ion exchange membrane 1101, respectively, and having at least two third through-holes corresponding to the at least four first through-holes 11021, for forming communication channels, so that the cathode reactant and the anode reactant are in contact with the anode catalyst 1104 and the cathode catalyst 1105 through the communication channels, respectively.

[0090] In this embodiment, the ion exchange membrane 1101 is an anion exchange membrane (AEM), a cation exchange membrane, a bipolar membrane.

[0091] In this embodiment, a plurality of the individual stack sets 110 are stacked to form the stack assembly 11.

[0092] In this embodiment, the anode flow channel plate 1102 further comprises an anode flow channel face, concavely provided on the anode flow channel plate 1102, and the anode flow channel is convexly provided on the anode flow channel face.

[0093] In this embodiment, the cathode flow channel plate 1103 further comprises a cathode flow channel face, concavely provided on the cathode flow channel plate 1103, and the cathode flow channel 11032 is convexly provided on the cathode flow channel face.

[0094] In this embodiment, the anode channel and cathode channel 11032 both include, but are not limited to, parallel channels, serpentine channels, or interdigitated channels.

[0095] In this embodiment, the anode catalyst 1104 is a gas diffusion electrode (GDE) and comprises an anode catalyst layer and an anode gas diffusion layer, and the anode catalyst layer is in contact with the first surface of the ion exchange membrane 1101, and the anode gas diffusion layer is in contact with the anode flow channel of the anode flow channel plate 1102.

[0096] In this embodiment, the anode catalyst 1104 is made of, but not limited to, iridium (Ir), nickel (Ni), platinum (Pt), iron (Fe), or an oxide thereof, or a combination thereof.

[0097] Preferably, the anode catalyst 1104 is made of a nickel (Ni), nickel-iron (NiFe), or iridium dioxide (IrO2) material.

[0098] Most preferably, the anode catalyst 1104 is made of an iridium dioxide (IrO2) material.

[0099] In this embodiment, the cathode catalyst 1105 is a gas diffusion electrode (GDE) and comprises a cathode catalyst layer and a cathode gas diffusion layer, and the cathode catalyst layer is in contact with the second surface of the ion exchange membrane 1101, and the cathode gas diffusion layer is in contact with the cathode flow channel 11032 of the cathode flow channel plate 1103.

[0100] In this embodiment, the anode catalyst 1105 is made of, but not limited to, copper (Cu), iron (Fe), silver (Ag), cobalt (Co), nickel (Ni), iridium (Ir), platinum (Pt), gold (Au), titanium (Ti), ruthenium (Ru), rhodium (Rh), or a carbide, oxide or carbonitride thereof, or a combination thereof.

[0101] In this embodiment, the anode catalyst 1104, the cathode catalyst 1105, and the ion exchange membrane 1101 are combined to form a membrane electrode assembly (MEA).

[0102] In this embodiment, the at least two gas barrier gaskets 1106 each have a specific thickness, for controlling the height of the first accommodating space and the second accommodating space 11051, and adjusting a compression ratio of the first internal space and the second internal space.

[0103] Preferably, the first accommodating space consists of the gas barrier 1106 having a thickness of 0.25 mm, the anion exchange membrane 1101, and the anode flow channel plate 1102, and the second accommodating space 11051 consists of the gas barrier 1106 having a thickness of 0.4 mm, the anion exchange membrane 1101, and the cathode flow channel plate 1103. Since HER (Hydrogen Evolution Reaction) and CO2RR (Carbon Dioxide Reduction Reaction) are competing reactions, reducing HER helps promote CO2RR.

[0104] The sizes of the first accommodating space and the second accommodating space 11051 affect the diffusion capacity of carbon dioxide gas and the selectivity and yield of the product finally produced. The first accommodating space and the second accommodating space 11051, formed by using a combination of the gas barrier gaskets 1106 (PTFE) having a total thickness of 0.65 mm (0.4 mm+0.25 mm), achieving a good compression ratio, enable the carbon dioxide electrolyzer module 1 to have the optimal faradaic efficiency for carbon dioxide.

[0105] In this embodiment, the gas barrier gasket 1106 is a gasket made of, but not limited to, a polypropylene (PP), polyamide (PA), acrylonitrile-butadiene-styrene (ABS), polyetherimide (PEI), polyphenylene sulfide (PPS), teflon (PTFE), or polyetheretherketone (PEEK) matrix material.

[0106] This embodiment further comprises two sealing gaskets, sealed between the anode flow channel plate 1102 and the gas barrier gasket 1106, and between the cathode flow channel plate 1103 and the gas barrier gasket 1106, respectively.

[0107] Referring to FIG. 3, it is a block diagram illustrating the functions of the reduction system for electrolyzing carbon dioxide of the present invention. The reduction system 3 for electrolyzing carbon dioxide in the present invention comprises the aforementioned carbon dioxide electrolyzer module 1; and a cathode reactant tank 301, for storing a cathode reactant, wherein the cathode reactant comprises compounds of CO2, H2O, H+ or OH−. a mass flow control unit 302, in communication with the cathode reactant tank 301 for receiving the flow rate of the cathode reactant and obtaining a mass flow rate; a pure water tank 303, for storing a pure water wash liquid for washing the carbon dioxide electrolyzer module 1; a first fluid multi-port valve 304, having a first water inlet connected to the mass flow control unit 302, a second water inlet connected to the pure water tank 303, and a first water outlet connected to the carbon dioxide electrolyzer module 1; an electrolyte storage tank 305, for storing an anode reactant, wherein the anode reactant comprises compounds of Group IA ions, OH−, CO32−, H2O, or PO43−, and in communication with the carbon dioxide electrolyzer module 1; an electrolyte circulation cooling module 306, in communication with the carbon dioxide electrolyzer module 1 and the electrolyte storage tank 305, for cooling the anode reactant reacted in the carbon dioxide electrolyzer module 1 and then injecting the cooled anode reactant into the electrolyte storage tank 305; a second fluid multi-port valve 307, having a third water inlet connected to the carbon dioxide electrolyzer module 1, a second water outlet, and a third water outlet for discharging a reduction product generated after reaction in the carbon dioxide electrolyzer module 1, or a waste liquid after washing the carbon dioxide electrolyzer module 1, respectively; a product storage unit 308, coupled to the second fluid multi-port valve 307 for collecting the reduction product; and a control unit 309, electrically connected to the mass flow control unit 302, the first fluid multi-port valve 304, the second fluid multi-port valve 307, and the electrolyte circulation cooling module 306, for controlling the flow of the cathode reactant and the anode reactant into the carbon dioxide electrolyzer module 1 and producing the reduction product.

[0108] In this embodiment, the half-reaction of the cathode reactant at the cathode is:CO2+H2O+2e−→CO+2OH−.

[0109] The Half-reaction of the Anode Reactant at the Anode is:2OH−→H2O+1 / 2O2+2e−.

[0110] The chemical reaction equation produced the product is:xCO2+(2x+y−z)H2O+(4x+y−2z)e−→C2HyOz30 (4x+y−2z)e−.

[0111] In this embodiment, the first end plate has at least one first fixing hole, the second end plate has at least one second fixing hole corresponding to the at least one first fixing hole, and the first end plate and the second end plate are fixed by combining the at least one first fixing hole and the at least one second fixing hole together through at least one first fixing component and at least one second fixing component, so that the first end plate, the second end plate and the stack assembly constitute the carbon dioxide electrolyzer module 1.

[0112] In this embodiment, the stack assembly further comprises at least one limit groove, the limit groove provided to pass through a limit rod for assisting in fixing the positions of the first end plate, the second end plate, the first insulation board, the second insulation board, the anode flow channel plate and the cathode flow channel plate. In the operations, the limit groove is located in the center of the two fixing holes. During assembly, a positioning rod is first inserted to fix the position of the stack assembly, and then screws are tightened before the positioning rod is lifted.

[0113] In this embodiment, the ion exchange membrane is an anion exchange membrane (AEM), a cation exchange membrane, a bipolar membrane.

[0114] In this embodiment, the anode flow channel plate further comprises an anode flow channel face, concavely provided on the anode flow channel plate, and the anode flow channel is convexly provided on the anode flow channel face.

[0115] In this embodiment, the cathode flow channel plate further comprises a cathode flow channel face, concavely provided on the cathode flow channel plate, and the cathode flow channel is convexly provided on the cathode flow channel face.

[0116] In this embodiment, the anode channel and cathode channel include, but are not limited to, parallel channels, serpentine channels, or interdigitated channels.

[0117] In this embodiment, the anode catalyst is a gas diffusion electrode (GDE) and comprises an anode catalyst layer and an anode gas diffusion layer, and the anode catalyst layer is in contact with the first surface of the ion exchange membrane, and the anode gas diffusion layer is in contact with the anode flow channel of the anode flow channel plate.

[0118] In this embodiment, the anode catalyst is made of, but not limited to, iridium (Ir), nickel (Ni), platinum (Pt), iron (Fe), or an oxide thereof, or a combination thereof.

[0119] Preferably, the anode catalyst is made of a nickel (Ni), nickel-iron (NiFe), or iridium dioxide (IrO2) material.

[0120] Most preferably, the anode catalyst is made of an iridium dioxide (IrO2) material.

[0121] In this embodiment, the cathode catalyst is a gas diffusion electrode (GDE) and comprises a cathode catalyst layer and a cathode gas diffusion layer, and the cathode catalyst layer is in contact with the second surface of the ion exchange membrane, and the cathode gas diffusion layer is in contact with the cathode flow channel of the cathode flow channel plate.

[0122] In this embodiment, the anode catalyst is made of, but not limited to, copper (Cu), iron (Fe), silver (Ag), cobalt (Co), nickel (Ni), iridium (Ir), platinum (Pt), gold (Au), titanium (Ti), ruthenium (Ru), rhodium (Rh), or a carbide, oxide or carbonitride thereof, or a combination thereof.

[0123] In this embodiment, the at least two gas barrier gaskets each have a specific thickness, for controlling the height of the first accommodating space and the second accommodating space, and adjusting a compression ratio of the first internal space and the second internal space.

[0124] Preferably, the first accommodating space consists of the gas barrier having a thickness of 0.25 mm, the anion exchange membrane, and the anode flow channel plate, and the second accommodating space consists of the gas barrier having a thickness of 0.4 mm, the anion exchange membrane, and the cathode flow channel plate. Since HER (Hydrogen Evolution Reaction) and CO2RR (Carbon Dioxide Reduction Reaction) are competing reactions, reducing HER helps promote CO2RR.

[0125] The sizes of the first accommodating space and the second accommodating space affect the diffusion capacity of carbon dioxide gas and the selectivity and yield of the product finally produced. The first accommodating space and the second accommodating space, formed by using the gas barrier gaskets (PTFE) in a total thickness of 0.4-0.7 mm, achieving a good compression ratio, enable the carbon dioxide electrolyzer module 1 to have the optimal faradaic efficiency for carbon dioxide.

[0126] Preferably, the gas barrier gaskets (PTFE) have a total thickness of 0.65 mm.

[0127] In this embodiment, the gas barrier gasket is a gasket made of, but not limited to, a polypropylene (PP), polyamide (PA), acrylonitrile-butadiene-styrene (ABS), polyetherimide (PEI), polyphenylene sulfide (PPS), teflon (PTFE), or polyetheretherketone (PEEK) matrix material.

[0128] This embodiment further comprises two sealing gaskets, sealed between the anode flow channel plate and the gas barrier gasket, and between the cathode flow channel plate and the gas barrier gasket, respectively.

[0129] In this embodiment, the first inlet and the first outlet in the first end plate and the second inlet and the second outlet in the second end plate are each provided with a removable adapter, the removable adapter being, but not limited to, an adapter made of a plastic, stainless steel, or metal material.

[0130] In this embodiment, the first inlet and the first outlet in the first end plate are diagonally mirrored with the second inlet and the second outlet in the second end plate.

[0131] Preferably, the first embodiment of the reduction system 3 for electrolyzing carbon dioxide in the present invention, further comprises a peristaltic pump, a humidifier, and a condensing tube. The peristaltic pump provides a driving force to convey the anode reactant into the stack, and is used to regulate the flow rate of the cathode reactant into the carbon dioxide electrolyzer module 1 via the mass flow control unit 302, while the humidifier is used to humidify the cathode reactant before conveying into the carbon dioxide electrolyzer module 1.

[0132] In the first embodiment, the anode catalyst consists of carbon paper and IrO2, and the cathode catalyst consists of carbon paper and silver, the carbon paper serving as a gas diffusion layer. The ion exchange membrane is an anion exchange membrane having a thickness of 20 to 100 μm. The anode reactant is an electrolyte, the electrolyte being a 0.1 M KHCO3 aqueous solution. Preferably, the gas barrier gasket is a PTFE material, the adapter is of stainless steel, and the anode and cathode flow channels are parallel flow channels.

[0133] When the power supply is connected to the current collector plates, it provides power to the carbon dioxide electrolyzer module 1 for electrolysis. The mass flow control unit 302 is used as a driving force for conveying carbon dioxide gas. After the gas enters the humidifier through the conduit, the moisture content of the carbon dioxide gas reaches saturation. The humidified carbon dioxide gas continues to be conveyed into the carbon dioxide electrolyzer module 1 and enters the cathode flow channel plate. It diffuses through the carbon paper and is in contact with the silver catalyst after flowing through the second accommodating space on the cathode flow channel, is subjected to a CO2RR reaction and produces a product gas including, but not limited to, carbon oxide and hydrogen gas. The product gas is collected after entering the condensing tube through the cathode flow channel plate outlet for condensation and dehydration. The electrolyte, using the peristaltic pump as a driving force, is drawn from the electrolyte storage tank 305 and conveyed through conduits to the carbon dioxide electrolyzer module 1. It flows through all the anode flow channel plates from the third through-holes and is subjected to an OER reaction (Oxygen Evolution Reaction) with the anode catalyst IrO2 while flowing through the anode flow channels, to produce oxygen gas; wherein water and anions in the electrolyte, such as OH− and CO32−, reach the cathode through the anion exchange membrane, assisting in the CO2RR reaction; the electrolyte, water, and oxygen gas from the anode flow channel plate outlet are conveyed back to the electrolyte storage tank 305 via conduits and reused as an anode mixture.

[0134] The gas barrier gasket in the first embodiment has four third through-holes, which are connected in parallel to each other in the stack, allowing the movement of the gas and the liquid within the stack assembly, as shown in FIG. 4.

[0135] The gas barrier gasket in another embodiment has only two third through-holes, which are connected in series to each other in the stack, allowing the electrolyte and gas to sequentially, rather than both at once, pass through the flow channel plates of the stack assembly formed by combining individual stack sets, thereby achieving the purpose of connecting electrodes in series and increasing the reaction area, as shown in FIG. 5.

[0136] Referring to FIG. 6, it is a flowchart of the steps of the reduction method applicable to the reduction system for electrolyzing carbon dioxide of the present application, including the following steps:

[0137] Step S610: passing the cathode reactant through the mass flow control unit via the cathode reactant tank, and obtaining the mass flow rate;

[0138] Step S620: passing the cathode reactant through the first water inlet of the first fluid multi-port valve into the carbon dioxide electrolyzer module at the mass flow rate via the control unit;

[0139] Step S630: passing the anode reactant into the carbon dioxide electrolyzer module via the electrolyte storage tank;

[0140] Step S640: electrolyzing the cathode reactant and the anode reactant using the carbon dioxide electrolyzer module to form the reduction product;

[0141] Step S650: then collecting the reduction product to the product storage unit via the second water outlet of the second fluid multi-port valve.

[0142] This embodiment further includes the following steps: when the carbon dioxide electrolyzer module needs cleaning, passing the pure water wash liquid into the carbon dioxide electrolyzer module from the second water inlet of the first fluid multi-port valve via the pure water tank, for cleaning the internal conduits of the carbon dioxide electrolyzer module; next, discharging the waste liquid via the third water outlet of the first fluid multi-port valve.

[0143] This embodiment further includes the following step: when the heated anode reactant flows out of the carbon dioxide electrolyzer module after the electrolysis reaction, cooling the anode reactant by the electrolyte circulation cooling module, and passing the anode reactant back to the electrolyte storage tank.

[0144] Preferably, in the use of the present invention, after a period of electrolysis, the control unit opens the first multi-port valve, allowing pure water from the pure water tank to enter the system through the first fluid multi-port valve. After flowing through the cathode flow channel plate, the waste liquid is discharged through the second fluid multi-port valve opened by the control unit, to wash away crystalline salts, such as potassium carbonate, in the flow channels.

[0145] In this embodiment, an electrolyte circulation cooling module is disposed in the conduits where the electrolyte flows back to the electrolyte storage tank, allowing the electrolyte to be cooled before flowing back to the electrolyte storage tank. The electrolyte circulation cooling module regulates the stack temperature by placing thermocouples at the electrolyte outlet and inlet of the stack, respectively, and these thermocouples are connected to the control unit. When the thermocouple at the outlet detects that the temperature of the electrolyte flowing out of the stack is higher than a set value, here set at 65° C., indicating that the stack temperature is too high, the control unit sends a signal to the peristaltic pump to accelerate the convey speed of the cooled electrolyte, thereby removing excess heat from the stack and achieving the purpose of controlling the stack temperature.

[0146] When the stack is subjected to cleaning, the power supply is first turned off and the electrolyte is replaced with water, preferably deionized water. The deionized water is circulated in the anode flow channel of the stack. When the deionized water passes through the anode flow channel plate, the potassium ions and salts thereof accumulated on the surface of and inside the cathode tab will diffuse into the deionized water due to the concentration difference, thereby achieving the effects of reducing salt deposition in the cathode tab and increasing the lifespan of the stack.

[0147] In summary, the carbon dioxide electrolyzer module, the reduction system for electrolyzing carbon dioxide and the reduction system of the present invention use an anode flow channel plate and a cathode flow channel plate as an anode electrode and a cathode electrode via gas diffusion electrodes, and use membrane electrode assembly (MEA) technology to effectively reduce the distance between the electrodes and reduce the resistance, improve the stability and the high current density of the electrodes, such that the electrolysis of carbon dioxide requires low energy consumption, allowing for excellent reaction efficiency in the electrolytic reduction of carbon dioxide, and achieving the effect of saving energy.

[0148] Although the present invention has been disclosed above with reference to the foregoing embodiments, they are not intended to limit the present invention. Any equivalent substitutions made by those skilled in the art without departing from the spirit and scope of the present invention, including alterations and modifications, shall still be within the protection scope of the present invention.

Claims

1. A carbon dioxide electrolyzer module, comprising:a stack assembly, formed by stacking at least two individual stack sets for electrolyzing a cathode reactant and an anode reactant to produce a reduction product; wherein the individual stack set further comprises:an ion exchange membrane, having a plurality of membrane pores and having a first surface and a second surface disposed opposite to each other;an anode flow channel plate, disposed on the first surface side of the ion exchange membrane, the anode flow channel plate having at least four first through-holes and an anode flow channel;a cathode flow channel plate, disposed on the second surface side of the ion exchange membrane, the cathode flow channel plate having at least four second through-holes corresponding to the at least four first through-holes and a cathode flow channel, wherein the anode flow channel plate and the cathode flow channel plate are combined in a manner in which the anode flow channel and the cathode flow channel are arranged facing each other;an anode catalyst, disposed in a first accommodating space between the ion exchange membrane and the anode flow channel plate, the first accommodating space having a first internal space for allowing the anode reactant to flow;a cathode catalyst, disposed in a second accommodating space between the ion exchange membrane and the cathode flow channel plate, the second accommodating space having a second internal space for allowing the cathode reactant to flow; andat least two gas barrier gaskets, disposed between the anode flow channel plate and the ion exchange membrane, and between the cathode flow channel plate and the ion exchange membrane, respectively, and having at least two third through-holes corresponding to the at least four first through-holes, for forming communication channels, so that the cathode reactant and the anode reactant are in contact with the anode catalyst and the cathode catalyst through the communication channels, respectively;a first end plate, disposed on one side of the stack assembly, and having a first inlet and a first outlet;a second end plate, disposed on the other side of the stack assembly, such that the stack assembly is sandwiched between the first end plate and the second end plate, the second end plate having a second inlet and a second outlet;a first insulation board, disposed between the first end plate and the stack assembly, and having a first insulation board through-hole and a first current collector plate groove corresponding to the first inlet and the first outlet;a second insulation board, disposed between the second end plate and the stack assembly, and having a second insulation board through-hole and a second current collector plate groove corresponding to the second inlet and the second outlet; andtwo current collector plates, disposed in the first current collector plate groove and the second current collector plate groove, respectively, for contacting the stack assembly.

2. The carbon dioxide electrolyzer module according to claim 1, characterized in that the first end plate has at least one first fixing hole, the second end plate has at least one second fixing hole corresponding to the at least one first fixing hole, and the first end plate and the second end plate are fixed by combining the at least one first fixing hole and the at least one second fixing hole together through at least one first fixing component and at least one second fixing component, so that the first end plate, the second end plate and the stack assembly constitute the carbon dioxide electrolyzer module.

3. The carbon dioxide electrolyzer module according to claim 2, characterized in that the stack assembly further comprises at least one limit groove, the limit groove provided to pass through a limit rod for assisting in fixing the positions of the first end plate, the second end plate, the first insulation board, the second insulation board, the anode flow channel plate and the cathode flow channel plate.

4. The carbon dioxide electrolyzer module according to claim 1, characterized in that the ion exchange membrane is ananion exchange membrane, a cation exchange membrane or a bipolar membrane.

5. The carbon dioxide electrolyzer module according to claim 1, characterized in that the anode flow channel plate further comprises an anode flow channel face, concavely provided in the anode flow channel plate, and the anode flow channel is convexly provided on the anode flow channel face.

6. The carbon dioxide electrolyzer module according to claim 1, characterized in that the cathode flow channel plate further comprises a cathode flow channel face, concavely provided in the cathode flow channel plate, and the cathode flow channel is convexly provided on the cathode flow channel face.

7. The carbon dioxide electrolyzer module according to claim 1, characterized in that the anode flow channel and the cathode flow channel comprise a parallel flow channel, a serpentine flow channel, or an interdigitated flow channel.

8. The carbon dioxide electrolyzer module according to claim 1, characterized in that the anode catalyst is a gas diffusion electrode and comprises an anode catalyst layer and an anode gas diffusion layer, wherein the anode catalyst layer is in contact with the first surface of the ion exchange membrane, and the anode gas diffusion layer is in contact with the anode flow channel of the anode flow channel plate.

9. The carbon dioxide electrolyzer module according to claim 1, characterized in that the anode catalyst is made of iridium, nickel, platinum, iron, or an oxide thereof, or a combination thereof.

10. The carbon dioxide electrolyzer module according to claim 1, characterized in that the cathode catalyst is a gas diffusion electrode and comprises a cathode catalyst layer and a cathode gas diffusion layer, wherein the cathode catalyst layer is in contact with the second surface of the ion exchange membrane, and the cathode gas diffusion layer is in contact with the cathode flow channel of the cathode flow channel plate.

11. The carbon dioxide electrolyzer module according to claim 1, characterized in that the cathode catalyst is made of copper, iron, silver, cobalt, nickel, iridium, platinum, gold, titanium, ruthenium, rhodium, or a carbide, oxide or carbonitride thereof, or a combination thereof.

12. The carbon dioxide electrolyzer module according to claim 1, characterized in that the at least two gas barrier gaskets each have a thickness for controlling the height of the first accommodating space and the second accommodating space, and adjusting a compression ratio of the first internal space and the second internal space.

13. The carbon dioxide electrolyzer module according to claim 1, characterized in that the gas barrier gasket is a gasket made of a polypropylene, polyamide, acrylonitrile-butadiene-styrene, polyetherimide, polyphenylene sulfide, teflon, or polyetheretherketone matrix material.

14. The carbon dioxide electrolyzer module according to claim 1, characterized in that it further comprises two sealing gaskets, sealed between the anode flow channel plate and the gas barrier gasket, and between the cathode flow channel plate and the gas barrier gasket, respectively.

15. The carbon dioxide electrolyzer module according to claim 1, characterized in that the first inlet and the first outlet in the first end plate and the second inlet and the second outlet in the second end plate are each provided with a removable adapter, the removable adapter being an adapter made of a plastic, stainless steel, or metal material.

16. The carbon dioxide electrolyzer module according to claim 1, characterized in that the first inlet and the first outlet in the first end plate are diagonally mirrored with the second inlet and the second outlet in the second end plate.

17. A reduction system for electrolyzing carbon dioxide, characterized in that it comprises the carbon dioxide electrolyzer module according to claim 1, and further comprising:a cathode reactant tank, for storing a cathode reactant, wherein the cathode reactant comprises compounds of CO2, H2O, H+, or OH−;a mass flow control unit, in communication with the cathode reactant tank, for receiving the flow rate of the cathode reactant and obtaining a mass flow rate;a pure water tank, for storing a pure water wash liquid for washing the carbon dioxide electrolyzer module;a first fluid multi-port valve, having a first water inlet connected to the mass flow control unit, a second water inlet connected to the pure water tank, and a first water outlet connected to the carbon dioxide electrolyzer module;an electrolyte storage tank, for storing an anode reactant, wherein the anode reactant comprises compounds of Group IA ions, OH−, CO32−, H2O, or PO43−, and in communication with the carbon dioxide electrolyzer module;an electrolyte circulation cooling module, in communication with the carbon dioxide electrolyzer module and the electrolyte storage tank, for cooling the anode reactant reacted in the carbon dioxide electrolyzer module and then injecting the cooled anode reactant into the electrolyte storage tank;a second fluid multi-port valve, having a third water inlet connected to the carbon dioxide electrolyzer module, a second water outlet, and a third water outlet for discharging a reduction product generated after reaction in the carbon dioxide electrolyzer module, or a waste liquid after washing the carbon dioxide electrolyzer module, respectively;a product storage unit, coupled to the second fluid multi-port valve for collecting the reduction product; anda control unit, electrically connected to the mass flow control unit, the first fluid multi-port valve, the second fluid multi-port valve, and the electrolyte circulation cooling module, for controlling the flow of the cathode reactant and the anode reactant into the carbon dioxide electrolyzer module and producing the reduction product.

18. The reduction system for electrolyzing carbon dioxide according to claim 17, characterized in that the first inlet in the first end plate is for the inflow of the cathode reactant or the pure water wash liquid, and the first outlet is for the outflow of the reduction product or the waste liquid.

19. The reduction system for electrolyzing carbon dioxide according to claim 17, characterized in that the second inlet and the second outlet in the second end plate are for the inflow of the anode reactant and the outflow of the heated anode reactant after the electrolysis reaction, respectively.

20. A reduction method applicable to the reduction system for electrolyzing carbon dioxide according to claim 17, characterized in that it includes the following steps:passing the cathode reactant through the mass flow control unit via the cathode reactant tank, and obtaining the mass flow rate;passing the cathode reactant through the first water inlet of the first fluid multi-port valve into the carbon dioxide electrolyzer module at the mass flow rate via the control unit;passing the anode reactant into the carbon dioxide electrolyzer module via the electrolyte storage tank;electrolyzing the cathode reactant and the anode reactant using the carbon dioxide electrolyzer module to form the reduction product;then collecting the reduction product to the product storage unit via the second water outlet of the second fluid multi-port valve.

21. The reduction method according to claim 20, characterized in that it further includes the following steps:when the carbon dioxide electrolyzer module needs cleaning, passing the pure water wash liquid into the carbon dioxide electrolyzer module from the second water inlet of the first fluid multi-port valve via the pure water tank, for cleaning the internal conduits of the carbon dioxide electrolyzer module;next, discharging the waste liquid via the third water outlet of the first fluid multi-port valve.

22. The reduction method according to claim 20, characterized in that it further includes the following step: when the heated anode reactant flows out of the carbon dioxide electrolyzer module after the electrolysis reaction, cooling the anode reactant via the electrolyte circulation cooling module, and passing the anode reactant back to the electrolyte storage tank.

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