CN114672832A - Carbon dioxide electrolysis reactor capable of simultaneously serving as flow cell and membrane electrode electrolytic cell - Google Patents
Carbon dioxide electrolysis reactor capable of simultaneously serving as flow cell and membrane electrode electrolytic cell Download PDFInfo
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- CN114672832A CN114672832A CN202210102802.8A CN202210102802A CN114672832A CN 114672832 A CN114672832 A CN 114672832A CN 202210102802 A CN202210102802 A CN 202210102802A CN 114672832 A CN114672832 A CN 114672832A
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 84
- 238000005868 electrolysis reaction Methods 0.000 title claims abstract description 45
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 42
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 36
- 239000012528 membrane Substances 0.000 title claims abstract description 32
- 238000007789 sealing Methods 0.000 claims abstract description 102
- 239000007788 liquid Substances 0.000 claims abstract description 76
- 238000009792 diffusion process Methods 0.000 claims abstract description 36
- 238000001125 extrusion Methods 0.000 claims abstract description 36
- 238000006243 chemical reaction Methods 0.000 claims abstract description 32
- 239000003792 electrolyte Substances 0.000 claims abstract description 19
- 238000012360 testing method Methods 0.000 claims abstract description 8
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 72
- 230000032258 transport Effects 0.000 description 44
- 230000009467 reduction Effects 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
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- 238000011160 research Methods 0.000 description 3
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 239000003011 anion exchange membrane Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000003014 ion exchange membrane Substances 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical class C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
- C25B9/17—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof
- C25B9/19—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/23—Carbon monoxide or syngas
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B3/00—Electrolytic production of organic compounds
- C25B3/01—Products
- C25B3/03—Acyclic or carbocyclic hydrocarbons
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B3/00—Electrolytic production of organic compounds
- C25B3/01—Products
- C25B3/07—Oxygen containing compounds
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B3/00—Electrolytic production of organic compounds
- C25B3/20—Processes
- C25B3/25—Reduction
- C25B3/26—Reduction of carbon dioxide
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
- C25B9/01—Electrolytic cells characterised by shape or form
Abstract
A carbon dioxide electrolysis reactor capable of simultaneously serving as a flow cell and a membrane electrode electrolytic cell is characterized in that an extrusion type screw cap sequentially extrudes and encapsulates a cathode gas transport cake, a first sealing rubber pad, a cathode gas diffusion electrode, a second sealing rubber pad, an exchange transport cake, a third sealing rubber pad, a diaphragm, a fourth sealing rubber pad, an anode liquid transport cake, a fifth sealing rubber pad, an anode electrode and a sixth sealing rubber pad in a reactor shell; during electrolysis, carbon dioxide gas enters the first reaction tank from the first gas flow pipeline, contacts with the cathode gas diffusion electrode to react, and is discharged from the second gas flow pipeline, so that the gas type and content data are obtained; obtaining a voltage current relationship at the electrochemical workstation; the electrolyte enters a second reaction tank and can contact with a cathode gas diffusion electrode, a diaphragm and an anode electrode to react; the invention solves the problems of poor applicability, poor sealing performance and poor testing performance caused by difficult operation of the existing reactor.
Description
Technical Field
The invention relates to the technical field of electrolytic reduction devices, in particular to a carbon dioxide electrolytic reactor capable of simultaneously serving as a flow cell and a membrane electrode electrolytic cell.
Background
Modern human activities have significantly increased the content of "greenhouse gas" CO2 in the air, causing serious negative effects on global climate change, air quality, energy safety, etc.
CO2 electrochemical reduction (CO2 electrochemical reaction, CO2ER) is carried out to generate useful products such as hydrocarbon/carbon oxygen compounds and the like in a high-value mode, and the fuel has good research value and application prospect. Its advantages can be summarized as follows: (1) can be carried out under mild conditions, does not need high temperature and high pressure, and is not limited by sunlight, climate and the like; (2) the solar energy and wind energy combined device can be coupled with clean energy such as photovoltaic energy, wind power and nuclear energy and is easy to realize large-scale production; (3) the reaction rate and the product selectivity can be indirectly controlled through the electrode potential, and a scheme is provided for searching a controllable and selectable carbon fixation mode.
At present, different from a traditional H-type cell, there are two new types of electrolytic cells for electrochemical reduction of CO2, namely a Flow-cell (Flow-cell) and a membrane electrode-cell (MEA-cell), in which the Flow-cell adopts a three-channel mode, i.e., a gas channel and two liquid channels, the gas channel is used for transmitting reactants CO2 and gas products, and the two liquid channels are used for flowing of catholyte and anolyte; the membrane electrode electrolytic cell adopts an electrode-diaphragm composite material, so that a double-channel mode is adopted, and the membrane electrode electrolytic cell is respectively a gas channel and a liquid channel; the diversity of the modes results in the diversity of the devices, and all the devices existing in the market can only be adapted to one test mode, so that a good solution is to be found.
The conventional CO2 electrocatalytic reduction reactor structure has the following drawbacks: (1) the structure is single, the dependency among the modules is strong, the dual-purpose function of one device cannot be realized, and the expansibility is not realized; (2) by adopting a four-screw type fixing structure, four corners cannot be controlled to be synchronously screwed, and liquid leakage is often caused by the fact that the four corners cannot be uniformly pressed; (3) the modules are loose, the installation operation difficulty is high, and each module has no place to be fixed in the installation process, is easy to scatter and is not easy to be independently installed.
Therefore, how to improve the above defects becomes a problem to be solved by those skilled in the art.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a carbon dioxide electrolysis reactor which can be used as a flow cell and a membrane electrode electrolytic cell simultaneously, and solves the problems of poor test performance caused by poor applicability, poor sealing performance and difficult operation of the conventional reactor.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a carbon dioxide electrolysis reactor capable of simultaneously serving as a flow cell and a membrane electrode electrolytic cell comprises a reactor shell 14 and an extrusion type spiral cover 1 matched with the reactor shell, wherein the extrusion type spiral cover 1 sequentially extrudes and encapsulates a cathode gas transport cake 2, a first sealing rubber pad 3, a cathode gas diffusion electrode 4, a second sealing rubber pad 5, an exchange transport cake 6, a third sealing rubber pad 7, a diaphragm 8, a fourth sealing rubber pad 9, an anode liquid transport cake 10, a fifth sealing rubber pad 11, an anode electrode 12 and a sixth sealing rubber pad 13 in the reactor shell 14; wherein the cathode gas diffusion electrode 4, the anode electrode 12 and the exchange transport cake 6 are connected with the electrodes of the electrochemical workstation through leads; the cathode gas transport cake 2 is communicated with an airflow hose; the pipelines of the exchange conveying cake 6 and the anode liquid conveying cake 10 are connected with an electrolyte bottle.
The cathode gas transports cake 2, first sealing rubber pad 3, cathode gas diffusion electrode 4 and second sealing rubber pad 5 from top to bottom closely laminate and constitute the cathode reaction module, all be equipped with the gas diffusion electrode opening in the middle of first sealing rubber pad 3 and the second sealing rubber pad 5.
The exchange transporting cake 6, the third sealing rubber pad 7, the diaphragm 8 and the fourth sealing rubber pad 9 are tightly attached from top to bottom to form a diaphragm exchange module, and openings of diaphragms required for electrolysis are arranged between the third sealing rubber pad 7 and the fourth sealing rubber pad 9.
The anode liquid transport cake 10, the fifth sealing rubber pad 11, the anode electrode 12 and the sixth sealing rubber pad 13 are tightly attached from top to bottom to form an anode reaction module, and a liquid diffusion electrode opening is formed in the middle of the fifth sealing rubber pad 11.
The reactor shell 14 is an accommodating carrier and is divided into two parts, the lower part is a module accommodating stacked layer, and the upper part is a threaded layer 14a for screwing connection with the extrusion type screw cap 1; the side wall of the lower part is provided with two symmetrical through holes 14b and a rectangular groove 14c, and the through holes 14b are used for allowing a gas and liquid conveying hose and a test electrode lead to penetrate through the side wall of the shell; the rectangular groove 14c is provided for the rectangular convex structure of the compressed packaging unit to be embedded.
The extrusion surface of the extrusion type screw cap 1 is provided with an extrusion convex structure 1c, and the periphery of the body is provided with an external thread 1b screwed into the reactor shell 14; the top end is provided with a stress member 1a for reinforcing the screwing-in depth wrench.
Rectangular positioning convex structures 2d are arranged on two sides of the cathode gas transport cake 2, and a first reaction tank 2b is arranged in the middle of the cathode gas transport cake; the first reaction tank 2b is provided at both sides with a first gas flow conduit 2a and a second gas flow conduit 2 c.
The exchange liquid transport cake 6 and the anode liquid transport cake 10 are identical in structure, rectangular positioning convex structures 6d are arranged on two sides, a second reaction tank 6b enabling the diaphragm to be in contact with electrolyte is arranged in the middle of the exchange liquid transport cake, a first liquid flow pipeline 6a, a second liquid flow pipeline 6c and a reference electrode lead 6e are arranged on the body on the outer side of the second reaction tank 6b, and the reference electrode lead 6e is connected to a counter electrode contact of an electrochemical workstation.
The first sealing rubber pad 3, the second sealing rubber pad 5, the third sealing rubber pad 7, the fourth sealing rubber pad 9, the fifth sealing rubber pad 11, the anode electrode 12 and the sixth sealing rubber pad 13 are all provided with rectangular convex structures, and the convex sizes of the convex structures are the same as those of the rectangular convex structures of the cathode gas transport cake 2, the anode liquid transport cake 10 and the exchange liquid transport cake 6.
A carbon dioxide electrolysis reactor capable of simultaneously serving as a flow cell and a membrane electrode electrolytic cell comprises a reactor shell 14 and an extrusion type screw cap 1 matched with the reactor shell, wherein the extrusion type screw cap 1 sequentially extrudes and encapsulates a cathode gas transport cake 2, a first sealing rubber pad 3, a cathode gas diffusion electrode 4, a diaphragm 8, an anode electrode 12, a fourth sealing rubber pad 9, an anode liquid transport cake 10, a fifth sealing rubber pad 11 and a sixth sealing rubber pad 13 in the reactor shell 14, wherein the cathode gas diffusion electrode 4 and the anode electrode 12 are connected with an electrochemical workstation electrode through leads; the cathode gas conveying cake 2 is communicated with an airflow hose; the pipeline of the anode liquid conveying cake 10 is connected with an electrolyte bottle.
The invention has the following beneficial effects:
(1) the carbon dioxide electrolysis reactor device comprises the anode module and the cathode module, and is simple in structure and convenient to operate compared with a traditional flow electrolytic cell and a membrane electrode electrolytic cell.
(2) The utility model provides a carbon dioxide electrolysis reactor device adopts atress type extrusion formula spiral cover 1 such as, and its lower surface is equipped with the protruding structure of extrusion that the diameter is less than cathode gas transport cake, through the screw thread screw in, reduces the protruding structure of extrusion, and each reaction module of compaction guarantees the impartial atress of all directions to adopt multilayer sealing rubber pad, guarantee that all subassemblies of each module are closely laminated, compare in traditional four screw type electrolyser, the leakproofness is good, easy operation.
(3) The utility model provides a carbon dioxide electrolysis reactor device, but adopt the extended structure, the accessible is got rid of the exchange among the diaphragm exchange module and is transported cake 6, deepens simultaneously and extrudees the spiral cover screw in degree of depth and accomplishes the equipment, with cathode gas diffusion electrode, proton exchange membrane and anode gas diffusion electrode complex become sandwich structure, arranges in the middle of cathode gas transportation cake and the positive pole liquid transportation cake to obtain novel combined material research and expand the application, satisfy the test demand of membrane electrode electrolytic cell (MEA-cell).
(4) The utility model provides a carbon dioxide electrolysis reactor device, 1 upper surface of extrusion formula spiral cover is equipped with spanner atress component, and when equipment and dismantlement, only need load and unload once, saves loading and unloading time, reduces the operation degree of difficulty.
(5) The utility model provides a carbon dioxide electrolysis reactor device transports the cake at cathode gas, and positive pole liquid transports the cake, and exchange liquid transports the cake, and on first to sixth sealing rubber pad shape, all be equipped with rectangle evagination structure, fixed direction when being convenient for install drives its rotation when avoiding simultaneously to extrude the spiral cover and leads to the material friction impaired to play the effect of protective material, the installation of being convenient for.
(6) The carbon dioxide electrolysis reactor device has the advantages of large electrolysis current of carbon dioxide, high current efficiency and long-time stable operation.
Drawings
Fig. 1 is a schematic structural view of a carbon dioxide electrolysis reactor apparatus of the present invention.
Fig. 2 is a schematic structural view of the extrusion type screw cap 1 of the present invention.
Fig. 3 is a schematic view of the structure of the cathode gas transport cake 2 of the present invention.
Fig. 4 is a schematic diagram of the structure of exchange liquid transport cake 6 (anode liquid transport cake 10) of the present invention.
Fig. 5 is a schematic structural view of the reactor shell 14 of the present invention.
FIG. 6 is a schematic view of the construction of the carbon dioxide electrolysis reactor apparatus of the present invention under the operating conditions of example 1.
FIG. 7 is a schematic view of the internal flow conditions of the carbon dioxide electrolysis reactor apparatus of the present invention under the operating conditions of example 1.
FIG. 8 is a schematic view of the construction of the carbon dioxide electrolysis reactor apparatus of the present invention under the operating conditions of example 2.
FIG. 9 is a schematic illustration of the internal flow conditions of the carbon dioxide electrolysis reactor apparatus of the present invention under the operating conditions of example 2.
Detailed Description
The technical solution in the embodiments of the present invention will be further clearly and completely described below with reference to the embodiments of the present invention according to the actual working mode. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example one
Referring to fig. 1, a carbon dioxide electrolysis reactor capable of simultaneously serving as a flow and membrane electrode electrolytic cell comprises a reactor shell 14 and an extrusion type spiral cover 1 configured with the reactor shell, wherein the extrusion type spiral cover 1 sequentially extrudes and encapsulates a cathode gas transport cake 2, a first sealing rubber pad 3, a cathode gas diffusion electrode 4, a second sealing rubber pad 5, an exchange transport cake 6, a third sealing rubber pad 7, a diaphragm 8, a fourth sealing rubber pad 9, an anode liquid transport cake 10, a fifth sealing rubber pad 11, an anode electrode 12 and a sixth sealing rubber pad 13 in the reactor shell 14; wherein, the cathode gas diffusion electrode 4, the anode electrode 12 and the exchange transport cake lead 6 are connected with the electrode of the electrochemical workstation through leads; the cathode gas transport cake 2 is communicated with an airflow hose; the pipelines of the exchange conveying cake 6 and the anode liquid conveying cake 10 are connected with an electrolyte bottle. The middle parts of the first to fifth sealing rubber gaskets 3,5,7,9 and 11 are provided with openings, and the middle part of the sixth rubber gasket 13 is not provided with an opening.
The cathode gas transport cake 2, the first sealing rubber gasket 3, the cathode gas diffusion electrode 4 and the second sealing rubber gasket 5 are tightly attached from top to bottom to form a cathode reaction module, and gas diffusion electrode openings are formed in the middles of the first sealing rubber gasket 3 and the second sealing rubber gasket 5.
And the third sealing rubber gasket 7, the diaphragm 8 and the fourth sealing rubber gasket 9 are tightly attached from top to bottom to form a diaphragm exchange module, and openings of diaphragms required for electrolysis are formed between the third sealing rubber gasket 7 and the fourth sealing rubber gasket 9.
The anode liquid conveying cake 10, the fifth sealing rubber gasket 11, the anode electrode 12 and the sixth sealing rubber gasket 13 are tightly attached from top to bottom to form an anode reaction module, and a liquid diffusion electrode opening is formed in the middle of the fifth sealing rubber gasket 11.
Referring to fig. 5, the reactor shell 14 is a holding carrier and is divided into two parts, the lower part is a stack layer for holding each module, and the upper part is a thread layer 14a for screwing connection with the extrusion type screw cap 1; the side wall of the lower part is provided with two symmetrical through holes 14b and a rectangular groove 14c, and the through holes 14b are used for allowing a gas and liquid conveying hose and a test electrode lead to penetrate through the side wall of the shell; the rectangular groove 14c is embedded by the rectangular convex structure of the extrusion packaging unit and ensures that the rectangular groove can be matched in size, and the conveying cake can not rotate to damage the surface of the electrode.
Referring to fig. 2, the extrusion surface of the extrusion type screw cap 1 is provided with an extrusion convex structure 1c, and the periphery of the body is provided with an external thread 1b screwed into the reactor shell 14; the top end is provided with a stress member 1a for reinforcing the screwing-in depth wrench. Through screw in 1b, reduce extrusion protruding structure 1c, each reaction module of compaction adopts equal altitude formula extrusion structure, guarantees the balanced atress of each direction, avoids four traditional screw structures because of the different weeping problems of screw in degree of depth.
Referring to fig. 3, rectangular positioning convex structures 2d are arranged on two sides of the cathode gas transport cake 2, a first reaction tank 2b is arranged in the middle of the cathode gas transport cake, and gas and liquid reactants react with a cathode electrode at the position; a first gas flow pipe 2a and a second gas flow pipe 2c, which are transport passages for a reactant (usually carbon dioxide) and a reaction product (containing hydrogen, methane, etc.), are provided at both sides of the first reaction tank 2 b.
Referring to fig. 4, rectangular positioning convex structures 6d are arranged on two sides of the exchange liquid transport cake 6, a second reaction tank 6b for making the diaphragm contact with the electrolyte is arranged in the middle of the exchange liquid transport cake, a first liquid flow pipeline 6a, a second liquid flow pipeline 6c and a reference electrode lead 6e are arranged on the body on the outer side of the second reaction tank 6b, and the first liquid flow pipeline, the second liquid flow pipeline and the reference electrode lead are connected to the outer side wall and can be connected with a counter electrode contact of the electrochemical workstation.
The anode liquid conveying cake 10 is identical in structure, rectangular positioning convex structures 10d are arranged on two sides of the anode liquid conveying cake, a third reaction tank 10b enabling a diaphragm to be in contact with electrolyte is arranged in the middle of the anode liquid conveying cake, a third liquid flow pipeline 10a, a fourth liquid flow pipeline 10c and a reference electrode lead 10e are arranged on a body on the outer side of the second reaction tank 10b, and the reference electrode lead 10e is connected to the outer side wall and can be connected with an electrochemical workstation counter electrode contact.
The anode electrode 12 is placed in the middle of the double-layer sealing rubber gaskets 11,13, and a lead (such as a thin copper strip) is in contact with the electrode and led out from one end.
The cathode gas diffusion electrode 4 should be placed in the middle of the double-layer sealing rubber gaskets 3,5, and a lead (e.g., a thin copper strip) should be in contact with the electrode and led out from one end.
The first sealing rubber pad 3, the second sealing rubber pad 5, the third sealing rubber pad 7, the fourth sealing rubber pad 9, the fifth sealing rubber pad 11, the anode electrode 12 and the sixth sealing rubber pad 13 are all provided with rectangular convex structures, and the sizes of the convex structures are the same as those of the rectangular convex structures of the cathode gas transport cake 2, the anode liquid transport cake 10 and the exchange liquid transport cake 6.
During installation, according to the reactor shell 14, the sixth sealing rubber pad 13, the anode electrode 12, the fifth sealing rubber pad 11, the anode liquid transport cake 10, the fourth sealing rubber pad 9, the diaphragm 8 and the third sealing rubber pad 7, the exchange transport cake 6, the second sealing rubber pad 5, the cathode gas diffusion electrode 4, the first sealing rubber pad 3, the cathode gas transport cake 2, the extrusion type screw cap 1 are sequentially arranged in sequence, and the screw cap is screwed by a wrench.
Referring to fig. 6 and 7, the air hoses are respectively connected to the first gas flow pipe 2a and the second gas flow pipe port 2c, the liquid flow pipes of the first electrolyte bottle are respectively connected to the first liquid flow pipe 6a and the second liquid flow pipe port 6c, and the liquid flow pipes of the second electrolyte bottle are respectively connected to the third liquid flow pipe 10a and the fourth liquid flow pipe port 10 c.
The cathode lead of the cathode gas diffusion electrode 4 is connected to the electrochemical workstation counter electrode, and the anode lead of the anode electrode 12 is connected to the electrochemical workstation counter electrode.
Optionally, the conductive probe 6e of the exchange liquid transport cake 6 is connected to an electrochemical workstation reference electrode.
The cathode gas diffusion electrode 4 is a copper-plated PTFE film.
The anode electrode 12 is hydrophobic carbon paper.
The diaphragm 8 is NafionTMA proton exchange membrane. In addition, anion exchange membranes, dual ion exchange membranes, may also be used.
The cathode lead and the anode lead both adopt thin copper foils.
During electrolysis, carbon dioxide gas enters the first reaction tank 2b through the first gas flow pipe 2a, contacts with the cathode gas diffusion 4 electrode to react, and is discharged through the second gas flow pipe 2 c. Detecting a gas characteristic peak on a gas chromatograph, thereby obtaining gas type and content data; the voltage-current relationship is available at the electrochemical workstation.
Referring to fig. 6 and 7, the electrolyte in the first electrolyte bottle enters the second reaction tank 6b through the first liquid flow line 6a, reacts with the cathode gas diffusion electrode 4 and the separator 8 in contact therewith, and is then discharged through the second liquid flow line 6 c.
The electrolyte in the second electrolyte bottle enters the third reaction tank 10b through the third liquid flow pipeline 10a, contacts with the diaphragm 8 and the anode electrode 12 to react, and is discharged through the fourth liquid flow pipeline 10 c.
Example 2
When the carbon dioxide electrolysis reactor device of the embodiment is applied to a carbon dioxide gas electrolysis reduction test method of a membrane electrode electrolytic cell (MEA-cell), based on the device of embodiment 1, the second sealing rubber gasket 5 is omitted, the transfer cake 6 is exchanged, the third sealing rubber gasket assembly 7 includes a reactor housing 14 and the extrusion type screw cap 1 when being installed, and the extrusion type screw cap 1 sequentially extrudes and encapsulates the cathode gas transfer cake 2, the first sealing rubber gasket 3, the cathode gas diffusion electrode 4, the diaphragm 8, the anode electrode 12, the fourth sealing rubber gasket 9, the anode liquid transfer cake 10, the fifth sealing rubber gasket 11 and the sixth sealing rubber gasket 13 in the reactor housing 14.
Referring to fig. 8 and 9, the air flow hoses are respectively connected to the first air flow pipe 2a and the second air flow pipe port 2c, and the liquid flow pipes of the first electrolyte bottle are respectively connected to the first liquid flow pipe 2a and the second liquid flow pipe port 2 c.
Referring to fig. 8, the cathode lead of the cathode gas diffusion electrode 4 is connected to the electrochemical workstation counter electrode, and the anode lead of the anode electrode 12 is connected to the electrochemical workstation counter electrode.
During electrolysis, carbon dioxide gas enters the first reaction tank 2b through the first gas flow pipe 2a, contacts with the cathode gas diffusion 4 electrode to react, and is discharged through the second gas flow pipe 2 c. Detecting a gas characteristic peak on a gas chromatograph, thereby obtaining gas type and content data; the voltage current relationship is available at the electrochemical workstation.
The electrolyte in the first electrolyte bottle enters the second reaction tank 2b through the first liquid flow pipeline 2a, contacts with the cathode gas diffusion electrode 4 and the diaphragm 8 to react, and is discharged through the second liquid flow pipeline 2 c. The membrane 8 may optionally be a Proton Exchange Membrane (PEM). The integral structure of the device can also be suitable for the research of a novel membrane electrode electrolytic cell (MEA-cell).
The membrane electrode electrolytic cell method can complete the assembly by removing the diaphragm exchange module 6 and deepening the screwing depth of the extrusion screw cap 1, and compound the cathode gas diffusion electrode 4, the proton exchange membrane 8 and the anode gas diffusion electrode 12 into a sandwich structure which is arranged between the cathode gas transport cake 2 and the anode liquid transport cake 10, so as to obtain the research and development application of novel composite materials. The assembly should follow the following steps, firstly, put the anode reaction module, the membrane exchange module, the cathode reaction module in the reactor shell in turn, the convex structure should be embedded into the groove, the lead should be placed in the shell opening direction 14 b; secondly, screwing in the extrusion type screw cap 1 and screwing by using a wrench; and finally, the electrode lead is connected with a testing device by penetrating through the through hole of the shell to connect the gas phase conduit and the liquid phase conduit.
Claims (10)
1. A carbon dioxide electrolysis reactor capable of simultaneously serving as a flow cell and a membrane electrode electrolytic cell is characterized by comprising a reactor shell (14) and an extrusion type spiral cover (1) matched with the reactor shell, wherein the extrusion type spiral cover (1) sequentially extrudes and encapsulates a cathode gas transport cake (2), a first sealing rubber pad (3), a cathode gas diffusion electrode (4), a second sealing rubber pad (5), an exchange transport cake (6), a third sealing rubber pad (7), a diaphragm (8), a fourth sealing rubber pad (9), an anode liquid transport cake (10), a fifth sealing rubber pad (11), an anode electrode (12) and a sixth sealing rubber pad (13) in the reactor shell (14); wherein the cathode gas diffusion electrode (4), the anode electrode (12) and the exchange transportation cake (6) are connected with the electrode of the electrochemical workstation through leads; the cathode gas conveying cake (2) is communicated with an airflow hose; the pipelines of the exchange conveying cake (6) and the anode liquid conveying cake (10) are connected with an electrolyte bottle.
2. The carbon dioxide electrolysis reactor capable of simultaneously serving as a flow cell and a membrane electrode electrolysis cell as claimed in claim 1, wherein the cathode gas transport cake (2), the first sealing rubber gasket (3), the cathode gas diffusion electrode (4) and the second sealing rubber gasket (5) are tightly attached from top to bottom to form a cathode reaction module, and a gas diffusion electrode opening is formed between the first sealing rubber gasket (3) and the second sealing rubber gasket (5).
3. The carbon dioxide electrolysis reactor capable of simultaneously serving as a flow cell and a membrane electrode electrolysis cell as claimed in claim 1, wherein the exchange transportation cake (6), the third sealing rubber gasket (7), the diaphragm (8) and the fourth sealing rubber gasket (9) are tightly attached from top to bottom to form a diaphragm exchange module, and an opening of the diaphragm required for electrolysis is arranged between the third sealing rubber gasket (7) and the fourth sealing rubber gasket (9).
4. The carbon dioxide electrolysis reactor capable of simultaneously serving as a flow cell and a membrane electrode electrolysis cell as claimed in claim 1, wherein the anode liquid conveying cake (10), the fifth sealing rubber gasket (11), the anode electrode (12) and the sixth sealing rubber gasket (13) are tightly attached from top to bottom to form an anode reaction module, and a liquid diffusion electrode opening is arranged in the middle of the fifth sealing rubber gasket (11).
5. A carbon dioxide electrolysis reactor as claimed in claim 1, which can be used as both flow and membrane electrode electrolysis cell, characterized in that the reactor housing (14) is a holding carrier, divided into two parts, the lower part is a stack of module holding layers, and the upper part is a screw layer (14a) for screw-in connection with the extrusion type screw cap (1); the side wall of the lower part is provided with two symmetrical through holes (14b) and a rectangular groove (14c), and the through holes (14b) are used for allowing the gas and liquid conveying hose and the test electrode lead to penetrate through the side wall of the shell; the rectangular groove (14c) is used for being embedded with the rectangular convex structure of the extruded packaging unit.
6. The carbon dioxide electrolysis reactor capable of simultaneously serving as a flow cell and a membrane electrode electrolysis cell is characterized in that the extrusion surface of the extrusion type screw cap (1) is provided with an extrusion convex structure (1c), the periphery of the body is provided with an external thread (1b), and the body is screwed into the reactor shell (14); the top end is provided with a stress component (1a) for reinforcing the screwing-in depth wrench.
7. The carbon dioxide electrolysis reactor capable of simultaneously serving as a flow cell and a membrane electrode electrolysis cell as claimed in claim 1, wherein rectangular positioning convex structures (2d) are arranged at two sides of the cathode gas transport cake (2), and a first reaction tank (2b) is arranged at the middle part of the cathode gas transport cake; a first gas flow pipeline (2a) and a second gas flow pipeline (2c) are arranged on two sides of the first reaction tank (2 b).
8. The carbon dioxide electrolysis reactor capable of simultaneously serving as a flow cell and a membrane electrode electrolysis cell according to claim 1, wherein the exchange liquid transport cake (6) and the anode liquid transport cake (10) have the same structure, rectangular positioning convex structures (6d) are arranged on two sides, a second reaction tank (6b) for enabling the diaphragm to be in contact with the electrolyte is arranged in the middle of the exchange liquid transport cake, a first liquid flow pipeline (6a), a second liquid flow pipeline (6c) and a reference electrode lead (6e) are arranged on the outer side body of the second reaction tank (6b), and the reference electrode lead (6e) is connected to the counter electrode contact of the electrochemical workstation.
9. The carbon dioxide electrolysis reactor capable of simultaneously serving as a flow cell and a membrane electrode electrolysis cell as claimed in claim 1, wherein the first sealing rubber gasket (3), the second sealing rubber gasket (5), the third sealing rubber gasket (7), the fourth sealing rubber gasket (9), the fifth sealing rubber gasket (11), the anode electrode (12) and the sixth sealing rubber gasket (13) are respectively provided with a rectangular convex structure, and the convex sizes of the convex structures are the same as those of the rectangular convex structures of the cathode gas transport cake (2), the anode liquid transport cake (10) and the exchange liquid transport cake (6).
10. A carbon dioxide electrolysis reactor capable of simultaneously serving as a flow cell and a membrane electrode electrolytic cell is characterized by comprising a reactor shell (14) and an extrusion type screw cap (1) matched with the reactor shell, wherein the extrusion type screw cap (1) sequentially extrudes and encapsulates a cathode gas transport cake (2), a first sealing rubber pad (3), a cathode gas diffusion electrode (4), a diaphragm (8), an anode electrode (12), a fourth sealing rubber pad (9), an anode liquid transport cake (10), a fifth sealing rubber pad (11) and a sixth sealing rubber pad (13) in the reactor shell (14), wherein the cathode gas diffusion electrode (4) and the anode electrode (12) are connected with an electrochemical workstation electrode through leads; the cathode gas conveying cake (2) is communicated with an airflow hose; the pipeline of the anode liquid conveying cake (10) is connected with an electrolyte bottle.
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| CN202210102802.8A CN114672832A (en) | 2022-01-27 | 2022-01-27 | Carbon dioxide electrolysis reactor capable of simultaneously serving as flow cell and membrane electrode electrolytic cell |
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