Large-area solid electrolyte reactor

Abstract

The utility model discloses a large-area solid electrolyte reactor which comprises two end plates arranged in a mirror symmetry manner as well as an anode, a cation exchange membrane, a central chamber, an anion exchange membrane and a cathode which are sequentially arranged between the two end plates, the two end plates are fastened and connected through bolts, and the anode, the cation exchange membrane, the central chamber, the anion exchange membrane and the cathode are pressed and sealed between the two end plates. According to the utility model, the area of the solid electrolyte reactor is enlarged, the operation stability of the reactor under a long-time condition is enhanced, the electro-catalytic gas reduction efficiency, the product purity and the system stability are improved, and the possibility is provided for an industrialized gas reduction reaction system by utilizing the solid electrolyte reactor.

Description

Technical Field

[0001] The utility model belongs to the technical field of electrochemical catalytic conversion reactors, and particularly relates to a large-area solid electrolyte reactor. Background Technique

[0002] The excessive use of fossil fuels such as coal, oil, and natural gas has led to a sharp increase in the emissions of harmful gases such as carbon dioxide and carbon monoxide, triggering severe environmental problems such as global warming. The electrocatalytic gas reduction reaction utilizes renewable solar and wind energy to drive the conversion into fuels and chemicals, realizing the resource utilization of harmful gases. During the electrocatalytic reduction process, the structure of the reactor is crucial for the transportation of reactants (such as carbon dioxide, etc.) and ions in the gas reduction reaction, the formation of the gas-liquid-solid three-phase reaction interface, the system stability, and the energy conversion efficiency.

[0003] Although traditional H-type cells, flow cells, and membrane electrode reactors perform well at the laboratory scale, they have problems such as low product purity and cumbersome separation and concentration steps in large-area applications. The emergence of solid electrolyte reactors provides new solutions to these challenges. Solid electrolyte reactors replace liquid electrolytes with solid electrolytes and introduce a porous solid electrolyte layer (PSE), decoupling the functions of ion conduction and product collection. This design not only improves the ion conduction efficiency but also effectively separates the reduction products from the reaction area, thereby reducing the interference of impurity ions and improving the product purity.

[0004] However, the area of most current solid electrolyte reactors is usually less than 10 cm 2 , which limits the gas reduction efficiency. Therefore, it is necessary to develop a large-area solid electrolyte reactor to achieve higher reaction efficiency and better product separation. Summary of the Utility Model

[0005] The utility model is proposed to overcome the problem of low yield and efficiency of small-area solid electrolyte reactors in the prior art, and its purpose is to provide a large-area solid electrolyte reactor.

[0006] The utility model is realized through the following technical solutions:

[0007] A large-area solid electrolyte reactor includes two end plates arranged symmetrically in a mirror image, and an anode, a cation exchange membrane, a central chamber, an anion exchange membrane, and a cathode sequentially arranged between the two end plates; the two end plates are tightly connected by bolts, and the anode, the cation exchange membrane, the central chamber, the anion exchange membrane, and the cathode are pressed and sealed between the two end plates.

[0008] In the above technical solution, the end plate is of a plate-like structure, and its inner side wall forms a condensation groove. The two side walls respectively form a condensate inlet and a condensate outlet. Both the condensate inlet and the condensate outlet are communicated with the condensation groove, and the horizontal position of the condensate inlet is lower than the horizontal position of the condensate outlet. A plurality of strip-shaped flow channel plates are evenly distributed on the bottom of the condensation groove, and adjacent flow channel plates are arranged staggeredly, so that an S-shaped flow channel is formed inside the condensation groove. A plurality of end plate fixing holes and a plurality of end plate positioning holes are evenly distributed around the end plate, and the end plate positioning holes are arranged inside the end plate fixing holes.

[0009] In the above technical solution, the anode includes an anode plate and an anode electrode, and the anode electrode is arranged close to the cation exchange membrane.

[0010] In the above technical solution, the anode plate is of a plate-like structure, with a parallel flow field formed in the middle thereof, and an anode plate sealing groove formed around the parallel flow field. A sealing ring is arranged in the anode plate sealing groove. An anode plate liquid inlet hole and a central chamber liquid outlet hole are arranged on one side wall of the anode plate, and an anode plate liquid outlet hole and a central chamber liquid inlet hole are arranged on the other side wall. The central chamber liquid outlet hole is located above the anode plate liquid inlet hole, and the anode plate liquid outlet hole is located above the central chamber liquid inlet hole. The anode plate liquid inlet hole and the anode plate liquid outlet hole are communicated with the parallel flow field. Both the central chamber liquid inlet hole and the central chamber liquid outlet hole are L-shaped holes, one end of which is flush with the side wall of the anode plate, and the other end is arranged on the end face between the parallel flow field and the anode plate sealing groove. A plurality of anode plate electrode interfaces are arranged on the top of the anode plate. A plurality of anode plate positioning holes and a plurality of central chamber connection holes are evenly distributed around the anode plate, and the anode plate positioning holes and the central chamber connection holes are arranged staggeredly. The number of anode plate positioning holes is the same as that of the end plate positioning holes, and they are arranged in corresponding positions.

[0011] In the above technical solution, the parallel flow field is composed of a groove formed in the middle of the end face of the anode plate and a plurality of flow guide plates evenly distributed in the groove. The plurality of flow guide plates are parallel and arranged at intervals, and longitudinal flow channels are formed at the intervals in the middle. There are intervals between the upper and lower ends of the flow guide plates and the groove wall, and transverse flow channels are formed at the intervals in the middle. The anode plate liquid inlet hole is communicated with the lower transverse flow channel. The anode plate liquid outlet hole is communicated with the upper transverse flow channel.

[0012] In the above technical solution, an electrolyte fixing structure and a fluid distribution structure are formed on the central chamber; the electrolyte fixing structure includes two groups of electrolyte tank groups, one group is arranged in the middle of the front of the central chamber, and the other group is arranged in the middle of the back of the central chamber, and the two groups of electrolyte tank groups are arranged correspondingly; each group of electrolyte tank groups includes a plurality of electrolyte tanks arranged at equal intervals and having the same size; the fluid distribution structure includes a transverse fluid distribution structure and a longitudinal fluid distribution structure; the longitudinal fluid distribution structure includes a plurality of longitudinal fluid guiding grooves evenly distributed on the wide sides of the electrolyte tanks, and the longitudinal fluid guiding grooves are opened along the length direction of the electrolyte tanks; the transverse fluid distribution structure includes two transverse fluid guiding grooves arranged at both ends of the length direction of the electrolyte tank group on the front of the central chamber and a plurality of transverse fluid distribution columns arranged inside the transverse fluid guiding grooves, the plurality of transverse fluid distribution columns are arranged at intervals, and the transverse fluid distribution columns are coaxially arranged with the transverse fluid guiding grooves; the longitudinal fluid guiding grooves on the front of the central chamber communicate the electrolyte tanks with the transverse fluid guiding grooves.

[0013] In the above technical solution, a plurality of central chamber positioning holes and a plurality of connection holes are evenly distributed around the central chamber, and the central chamber positioning holes and the connection holes are arranged alternately. The number of central chamber positioning holes is the same as that of the end plate positioning holes, and the positions are correspondingly arranged.

[0014] In the above technical solution, the cathode includes a cathode gas diffusion electrode, a cathode gasket, and a cathode plate arranged in sequence; the cathode gas diffusion electrode is arranged close to the anion exchange membrane.

[0015] In the above technical solution, the cathode gasket is of a long rectangular frame structure, and positioning holes with the same number and position as those of the end plate positioning holes are arranged at its four corners; the length and width of the cathode gas diffusion electrode are greater than the length and width of the inner circle of the cathode gasket.

[0016] In the above technical solution, a serpentine flow field is formed in the middle of the cathode plate, a cathode plate sealing groove is formed around the serpentine flow field, and a sealing ring is arranged in the cathode plate sealing groove; cathode gas inlets and cathode gas outlets are respectively formed on both side walls of the cathode plate, the cathode gas inlets and the cathode gas outlets are arranged diagonally, and the horizontal position of the cathode gas inlet is higher than the horizontal position of the cathode gas outlet; a plurality of cathode plate positioning holes are evenly distributed on the edge of the cathode plate, the number of cathode plate positioning holes is the same as that of the end plate positioning holes, and the positions are correspondingly arranged; a plurality of cathode plate electrode interfaces are arranged on the top of the cathode plate.

[0017] In the above technical solution, the serpentine flow field is composed of serpentine grooves formed in the cathode plate and a plurality of serpentine flow guiding ridges arranged in the serpentine grooves; the inlet and outlet of the serpentine flow field are arranged diagonally.

[0018] The beneficial effects of the present utility model are:

[0019] The utility model provides a large-area solid electrolyte reactor, which realizes the area amplification of the solid electrolyte reactor, enhances the stability of the reactor during long-term operation, improves the efficiency of electrocatalytic gas reduction, the product purity and the system stability, and provides the possibility for the industrial gas reduction reaction system using the solid electrolyte reactor. The utility model realizes 100 cm 2 amplification of the solid electrolyte reactor, realizes enhancing the stability of the reactor during long-term operation, improves the yield and reaction efficiency, and provides the possibility for the industrial gas reduction reaction system using the solid electrolyte reactor. Brief Description of the Drawings

[0020] Figure 1 is the explosion structure schematic diagram of the utility model;

[0021] Figure 2 is the overall structure schematic diagram of the utility model;

[0022] Figure 3 is the structure schematic diagram of the end plate in the utility model;

[0023] Figure 4 is the structure schematic diagram of the anode plate in the utility model;

[0024] Figure 5 is the structure schematic diagram of the cathode plate in the utility model;

[0025] Figure 6 is the structure schematic diagram of the anode side of the central chamber in the utility model;

[0026] Figure 7 is the structure schematic diagram of the cathode side of the central chamber in the utility model.

[0027] Wherein:

[0028] 1. End plate; 11. Condensation tank; 12. Condensate inlet; 13. Condensate outlet; 14. End plate positioning hole; 15. End plate fixing hole; 16. Flow channel plate

[0029] 2. Anode; 21. Anode plate; 211. Parallel flow field; 212. Anode plate liquid inlet hole; 213. Anode plate liquid outlet hole; 214. Anode plate sealing groove; 215. Anode plate positioning hole; 216. Central chamber connection hole; 217. Central chamber liquid inlet hole; 218. Central chamber liquid outlet hole; 219. Anode plate electrode interface; 22. Anode electrode;

[0030] 3. Cation exchange membrane;

[0031] 4. Central chamber; 41. Electrolyte tank; 42. Longitudinal fluid guiding groove; 43. Transverse fluid guiding groove; 44. Transverse fluid distribution column; 45. Central chamber positioning hole; 46. Connection hole;

[0032] 5. Anion exchange membrane;

[0033] 6. Cathode; 61. Cathode plate; 61. Cathode plate; 611. Serpentine flow field; 612. Cathode plate sealing groove; 613. Cathode plate positioning hole; 614. Cathode plate electrode interface; 615. Cathode gas inlet; 616. Cathode gas outlet; 62. Cathode gas diffusion electrode; 63. Cathode gasket.

[0034] For those of ordinary skill in the art, without creative efforts, other related drawings can be obtained based on the above drawings. Detailed implementation manners

[0035] In order to enable the personnel in the technical field to better understand the technical solution of the present utility model, the technical solution of the present utility model will be further described below in conjunction with the drawings in the specification and through specific implementation manners.

[0036] As Figure 1 、 2 shown, a large-area solid electrolyte reactor includes two end plates 1 arranged symmetrically in a mirror image, and an anode 2, a cation exchange membrane 3, a central chamber 4, an anion exchange membrane 5 and a cathode 6 arranged in sequence between the two end plates 1; the two end plates 1 are tightly connected by bolts, and the anode 2, the cation exchange membrane 3, the central chamber 4, the anion exchange membrane 5 and the cathode 6 are pressed and sealed between the two end plates 1.

[0037] As Figure 3 shown, the end plate 1 is a plate-like structure, and its inner side wall forms a condensation groove 11, and the two side walls respectively form a condensate inlet 12 and a condensate outlet 13. The condensate inlet 12 and the condensate outlet 13 are both communicated with the condensation groove 11, and the horizontal position of the condensate inlet 12 is lower than the horizontal position of the condensate outlet 13; a plurality of long strip-shaped flow channel plates 16 are uniformly distributed on the bottom of the condensation groove 11, and adjacent flow channel plates 16 are arranged in a staggered manner, so that an S-shaped flow channel is formed inside the condensation groove 11; a plurality of end plate fixing holes 15 and a plurality of end plate positioning holes 14 are uniformly distributed around the end plate 1, and the end plate positioning holes are arranged inside the end plate fixing holes 15.

[0038] The material of the end plate 1 is any one of polytetrafluoroethylene, polyether ether ketone, stainless steel and aluminum plate; the thickness of the end plate 1 is 5 - 15 mm.

[0039] The anode 2 includes an anode plate 21 and an anode electrode 22, and the anode electrode 22 is arranged close to the cation exchange membrane 3;

[0040] As shown Figure 4 in the figure, the anode plate 21 has a plate-like structure, with a parallel flow field 211 formed in the middle thereof, and an anode plate sealing groove 214 formed around the parallel flow field 211, and a sealing ring is arranged in the anode plate sealing groove 214; a liquid inlet hole 212 of the anode plate and a liquid outlet hole 218 of the central chamber are arranged on one side wall of the anode plate 21, and a liquid outlet hole 213 of the anode plate and a liquid inlet hole 217 of the central chamber are arranged on the other side wall, and the liquid outlet hole 218 of the central chamber is located above the liquid inlet hole 212 of the anode plate, and the liquid outlet hole 213 of the anode plate is located above the liquid inlet hole 217 of the central chamber; the liquid inlet hole 212 of the anode plate and the liquid outlet hole 213 of the anode plate are communicated with the parallel flow field 211, and both the liquid inlet hole 217 of the central chamber and the liquid outlet hole 218 of the central chamber are L-shaped holes, one end of which is flush with the side wall of the anode plate 21, and the other end is arranged on the end face between the parallel flow field 211 and the anode plate sealing groove 214; a plurality of electrode interfaces 219 of the anode plate are arranged on the top of the anode plate 21; a plurality of positioning holes 215 of the anode plate and a plurality of connecting holes 216 of the central chamber are evenly distributed around the anode plate 21, and the positioning holes 215 of the anode plate and the connecting holes 216 of the central chamber are arranged staggeredly, the number of the positioning holes 215 of the anode plate is the same as that of the end plate positioning holes 14, and the positions are correspondingly arranged;

[0041] The parallel flow field 211 is composed of a groove formed in the middle of the end face of the anode plate 21 and a plurality of flow guiding plates evenly distributed in the groove. The plurality of flow guiding plates are parallel and spaced apart, and longitudinal flow channels are formed in the middle at intervals; the distance between adjacent flow guiding plates is 2 mm to 4 mm, and the height of the flow guiding plate is 2 mm to 5 mm; the upper and lower ends of the flow guiding plate are spaced from the groove wall, and transverse flow channels are formed in the middle at intervals. The width of the transverse flow channel is 2 mm to 4 mm, and the depth is 5 mm to 10 mm; the liquid inlet hole 212 of the anode plate is communicated with the lower transverse flow channel; the liquid outlet hole 213 of the anode plate is communicated with the upper transverse flow channel;

[0042] The anode plate 21 is made of a titanium plate, and its thickness is 5 mm to 15 mm.

[0043] After the anode plate 21 and the end plate 1 on the anode plate side are sealed, a condensation chamber is formed in the condensation tank. The condensate enters from the condensate inlet 12 and flows out from the condensate outlet 13 after passing through the condensation chamber. The positions of the end plate on the anode side and the anode plate are determined by the end plate positioning holes and the anode plate positioning holes.

[0044] The parallel flow field 211 is sealed by the cation exchange membrane 3 and the sealing groove. The cation exchange membrane 3 selectively passes cations, with an anode electrode 22 arranged on one side and a central chamber 4 on the other side. A reaction solution is introduced into the anode plate 21. In the present utility model, the reaction solution is water or other electrolyte solutions. The water or other electrolyte solutions enter from the liquid inlet of the anode plate 21 and flow out from the liquid outlet of the anode plate 21 after passing through the parallel flow field 211.

[0045] As Figure 6 , 7 shown, the central chamber 4 is a plate-like structure, on which an electrolyte fixing structure and a fluid distribution structure are formed; the electrolyte fixing structure includes two groups of electrolyte tank groups, one group is arranged in the middle of the front surface of the central chamber 4, and the other group is arranged in the middle of the back surface of the central chamber 4, and the two groups of electrolyte tank groups are arranged corresponding to each other; each group of electrolyte tank groups includes a plurality of electrolyte tanks 41 arranged at equal intervals and having the same size; the electrolyte tank 41 is a rectangular tank;

[0046] The fluid distribution structure includes a transverse fluid distribution structure and a longitudinal fluid distribution structure; the longitudinal fluid distribution structure includes a plurality of longitudinal fluid guiding grooves 42 evenly distributed on the wide sides of the electrolyte tank 41, and the longitudinal fluid guiding grooves 42 are opened along the length direction of the electrolyte tank 41;

[0047] The transverse fluid distribution structure includes two transverse fluid guiding grooves 43 arranged at both ends of the length direction of the electrolyte tank group on the front surface of the central chamber 4 and a plurality of transverse fluid distribution columns 44 arranged inside the transverse fluid guiding grooves 43;

[0048] The length of the transverse fluid guiding groove 43 is greater than the sum of the widths of the electrolyte tank groups;

[0049] One end of the transverse fluid guiding groove 43 is flush with the electrolyte tank group, and the other end extends beyond the electrolyte tank group, and the extending ends of the transverse fluid guiding grooves 43 at the upper and lower ends are staggered;

[0050] The longitudinal fluid guiding grooves 42 on the front surface of the central chamber 4 connect the electrolyte tank 41 with the transverse fluid guiding groove 43, and the longitudinal fluid guiding grooves 42 on the back surface of the central chamber 4 optimize the fluid flow channel and allow the fluid to flow in both positive and negative directions; the design of the longitudinal fluid distribution structure can, on the one hand, avoid the blockage of the longitudinal fluid flow grooves by solid electrolyte particles, and on the other hand, effectively relieve the pressure difference between the inlet and outlet liquids, making the fluid more evenly distributed and flowing more smoothly in each electrolyte tank 41, thereby forming a uniform fluid flow pattern in the entire electrolyte tank group. The plurality of transverse fluid distribution columns 44 are arranged at intervals, and the transverse fluid distribution columns 44 are coaxially arranged with the transverse fluid guiding groove 43; a plurality of central chamber positioning holes 45 and a plurality of connecting holes 46 are evenly distributed around the central chamber 4, and the central chamber positioning holes 45 and the connecting holes 46 are staggered, and the number of the central chamber positioning holes 45 is the same as that of the end plate positioning holes 14 and they are arranged corresponding to each other;

[0051] The material of the central chamber 4 is any one of polytetrafluoroethylene, polyether ether ketone, stainless steel and titanium plate; its thickness ≤ 5 mm; the width of the transverse fluid guiding groove 42 ≤ 5 mm; the width of the transverse fluid distribution column 43 ≤ 3 mm; the width of the longitudinal fluid guiding groove 44 ≤ 1.5 mm; the diameter of the central chamber positioning hole 45 ≤ 4 mm.

[0052] The cathode 6 includes a cathode gas diffusion electrode 62, a cathode gasket 63, and a cathode plate 61 that are arranged in sequence; the cathode gas diffusion electrode 62 is arranged close to the anion exchange membrane 5;

[0053] The cathode gasket 63 is of a long rectangular frame structure, and positioning holes consistent with the number and position of the end plate positioning holes 14 are arranged at its four corners;

[0054] The length and width of the cathode gas diffusion electrode 62 are greater than the length and width of the inner circle of the cathode gasket 63;

[0055] As Figure 5 shown, the cathode plate 61 is of a plate structure, a serpentine flow field 611 is formed in the middle thereof, a cathode plate sealing groove 612 is formed around the serpentine flow field 611, and a sealing ring is arranged in the cathode plate sealing groove 612; cathode gas inlets 615 and cathode gas outlets 616 are respectively formed on both side walls of the cathode plate 61, the cathode gas inlets 615 and the cathode gas outlets 616 are arranged diagonally, and the horizontal position of the cathode gas inlets 615 is higher than the horizontal position of the cathode gas outlets 616; a plurality of cathode plate positioning holes 613 are evenly distributed on the edge of the cathode plate 61, the number of the cathode plate positioning holes 613 is consistent with the number of the end plate positioning holes 14, and the positions are correspondingly arranged; a plurality of cathode plate electrode interfaces 614 are arranged on the top of the cathode plate 61;

[0056] The cathode plate 61 is made of a titanium plate with a thickness of 5 - 15 mm;

[0057] The serpentine flow field 611 is composed of a serpentine groove formed in the cathode plate 61 and a plurality of serpentine flow guiding ridges arranged in the serpentine groove; the inlets and outlets of the serpentine flow field 611 are arranged diagonally; the width of the serpentine groove is 0.5 mm - 2 mm, the depth is 0.5 mm - 2 mm, and the distance between adjacent serpentine flow guiding ridges is 0.5 mm - 2 mm;

[0058] The multi - serpentine flow field of the cathode plate is sealed by an anion exchange membrane and a cathode plate sealing ring groove. The anion exchange membrane selectively passes anions. One side is provided with a cathode gas diffusion electrode and a cathode gasket, and the other side is a central chamber. The cathode gas diffusion electrode and the cathode gasket are arranged on one side of the multi - serpentine flow field of the cathode plate. A reaction gas is introduced into the cathode plate. In the present invention, the reaction gas is carbon dioxide or other gases. Carbon dioxide or other gases enter from the cathode gas inlet, and after passing through the multi - serpentine flow field of the cathode plate, the unreacted gas flows out from the cathode gas outlet.

[0059] The working principle of the present invention:

[0060] The liquid inlet of the anode and cathode end plates is connected to the condensate. The anode and cathode plates are connected to the external circuit. The cathode plate is connected to the gas, and the anode plate is connected to the electrolyte. The central chamber collects and discharges the liquid products.

[0061] The connection of the condensate to the anode and cathode end plates ensures the temperature environment required for the reaction system using the solid electrolyte reactor.

[0062] The O-ring grooves are provided around the cathode and anode plates, ensuring good airtightness. The parallel flow field structure of the anode plate and the cation exchange membrane structure work together to achieve the rapid detachment of oxygen at the anode, alleviating the transmembrane penetration of the anode electrolyte into the central chamber due to oxygen backpressure.

[0063] The synergistic effect of the serpentine flow field structure of the cathode plate and the anion exchange membrane structure allows the gas to pass through the cathode gas diffusion electrode, effectively alleviating the cathode flooding phenomenon.

[0064] The distributed central chamber structure ensures uniform distribution and smooth flow of the liquid products, improving the operating stability of the entire reactor.

[0065] To reliably fix the stacking structure between the anode plate, cathode plate, and central chamber, bolts are used to lock between the end plates on the outer sides of the anode plate and the cathode plate respectively, thereby pressing the anode plate, cathode plate, and central chamber between the two end plates to ensure the structural stability, and using the anode plate seal ring groove and cathode plate seal ring groove to ensure the sealing between the cation exchange membrane, anion exchange membrane, anode plate, cathode plate, and central chamber.

[0066] In addition, the condensate inlet, condensate outlet, anode plate liquid outlet, anode plate liquid inlet, central chamber liquid inlet, central chamber liquid outlet, cathode gas inlet, and cathode gas outlet are all provided on the side of the plate to facilitate the installation and fixation of the stacked electrochemical reactor.

[0067] The positive and negative poles of the external power supply are respectively set on the electrode interfaces of the anode plate and the cathode plate. According to the Figure 1 stacking setting form in, under the external voltage condition, an oxidation reaction occurs at the interface of the anode electrode, and the water in the parallel flow field of the anode plate is electrocatalytically oxidized to hydrogen ions and oxygen. Among them, the hydrogen ions pass through the ion exchange membrane into the central chamber side under the action of the electric field. The oxygen and water (or aqueous solution) generated by the reaction are discharged together from the anode plate liquid outlet.

[0068] On the other hand, on the cathode plate side, a gas reduction reaction occurs on the cathode gas diffusion electrode, and the gas in the multi-serpentine flow field of the cathode plate is electrocatalytically reduced to anions. Depending on the nature of the catalyst, the reduced anions are different. The reduced anions combine with hydrogen ions in the central chamber to form products, and finally the water introduced into the central chamber brings out the liquid products from the central chamber liquid outlet.

[0069] Application Example 1

[0070] Use a solid electrolyte reactor to reduce CO2 to prepare a high-purity formic acid solution. The size of the solid electrolyte electrolyzer used is 150×150 mm, and the area of the electrolyte fixed structure region in the central chamber is 100×100 mm. Use BiOBr sprayed on a hydrophobic carbon paper (100×100 mm) as the cathode gas diffusion electrode 7 to reduce carbon dioxide to prepare a high-purity formic acid solution, with a loading of 0.6 mg·cm -2 , electroplate ruthenium iridium on titanium foam as the anode electrode 5 to carry out the electrolysis of water reaction to produce oxygen, with a loading of 1 mg·cm -2 , IR120 is used as the solid electrolyte to assemble a solid electrolyte reactor ( Figure 1 ). Among them, the CO2 gas flow rate is 100 sccm, the flow rate of DI water introduced into the anode is 100 rpm / min, and the flow rate of DI water introduced into the solid electrolyte layer is 5 ml·min -1 , at a current density of 100 mA / cm 2 , the Faraday efficiency (FE) of formic acid is 95%, and 3 L of a high-purity formic acid solution with a concentration of 7.49 M is obtained in 10 h, and the stable reaction lasts for 42 h, with a power reaching 50 W.

[0071] Application Example 2

[0072] Use a solid electrolyte reactor to reduce CO to prepare a high-purity acetic acid solution. The size of the solid electrolyte electrolyzer used is 150×150 mm, and the area of the electrolyte fixed structure region in the central chamber is 100×100 mm. Use Cu2O NCs sprayed on a hydrophobic carbon paper (100×100 mm) as the cathode gas diffusion electrode 7 to reduce carbon monoxide to prepare a high-purity acetic acid solution, with a loading of 0.8 mg·cm -2 , spray IrO2 / C on titanium foam as the anode electrode 5 to carry out the electrolysis of water reaction to produce oxygen, with a loading of 1 mg·cm -2 , IR120 is used as the solid electrolyte to assemble a solid electrolyte reactor ( Figure 1 ). Among them, the CO gas flow rate is 200 sccm, the flow rate of DI water introduced into the anode is 100 rpm / min, and the flow rate of DI water introduced into the solid electrolyte layer is 5 ml·min -1 , at a current density of 200 mA / cm 2 , the Faraday efficiency (FE) of acetic acid is 55%, the concentration of the high-purity acetic acid solution is 5.68 M, the stable reaction lasts for 30 h, and the power reaches 140 W.

[0073] Application Example 3

[0074] Preparation of high-purity hydrogen peroxide (H2O2) solution by O2 reduction using a solid-state electrolyte reactor. The size of the solid-state electrolyte electrolytic cell used is 150×150 mm, and the area of the electrolyte fixing structure region in the central chamber is 100×100 mm. Platinum-carbon sprayed on hydrophobic carbon paper (100×100 mm) is used as the cathode gas diffusion electrode 7 to carry out oxygen reduction to prepare high-purity H2O2 solution, with a loading of 0.46 mg·cm -2 , IrO2 / C on titanium foam is used as the anode electrode 5, and 0.5 M H2SO4 solution is introduced for oxidation reaction, with a loading of 1 mg·cm -2 , IR120 is used as the solid-state electrolyte to assemble the solid-state electrolyte reactor ( Figure 1 ). Among them, the O2 gas flow rate is 50 sccm, the flow rate of the 0.5 M H2SO4 solution introduced into the anode is 100 rpm / min, the flow rate of DI water introduced into the solid-state electrolyte layer is 2 ml·min-1. At a current density of 100 mA / cm 2 , the Faraday efficiency (FE) of H2O2 is 90%, the yield reaches 0.3 mol / h, and the stable reaction lasts for 100 h.

[0075] Experiments show that the utility model has the characteristics of wide application range, uniform fluid flow, high stability and simple installation. Currently at the laboratory stage, the large-area solid-state electrolyte reactor of the utility model is not only applicable to the experimental development in the field of CO2 reduction, but also applicable to the reduction of CO, O2 and other gases.

[0076] The large-area solid-state electrolyte reactor provided by the utility model effectively realizes the enlargement of the reactor area through its unique structural design. This innovative structural design not only improves the stability of the reactor under long-term operation conditions, but also significantly increases the yield and efficiency of the electrocatalytic reaction; by increasing the effective reaction area, the reactor can better adapt to large-scale industrial applications, especially in gas reduction reaction systems, showing good application prospects; the design of this reactor of the utility model provides new possibilities for the industrialization of solid-state electrolyte technology, promoting the development of clean energy and environmental protection technologies.

[0077] It should be noted that, without conflict, the embodiments in the utility model and the features in the embodiments can be combined with each other.

[0078] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0079] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood through specific circumstances.

[0080] The applicant declares that the above description is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by any person skilled in the art within the technical scope disclosed by the present utility model fall within the protection scope and the disclosure scope of the present utility model.

Claims

1. A large-area solid electrolyte reactor, characterized in that: It includes two end plates (1) arranged symmetrically by mirror image, and an anode (2), a cation exchange membrane (3), a central chamber (4), an anion exchange membrane (5) and a cathode (6) sequentially arranged between the two end plates (1); the two end plates (1) are fixedly connected by bolts, and the anode (2), the cation exchange membrane (3), the central chamber (4), the anion exchange membrane (5) and the cathode (6) are pressed and sealed between the two end plates (1). The end plate (1) is of a plate-like structure, with a condensation groove (11) formed on its inner side wall, a condensate inlet (12) and a condensate outlet (13) respectively formed on its two side walls. The condensate inlet (12) and the condensate outlet (13) are both communicated with the condensation groove (11), and the horizontal position of the condensate inlet (12) is lower than that of the condensate outlet (13); a plurality of strip-shaped flow channel plates (16) are evenly distributed on the bottom of the condensation groove (11), and adjacent flow channel plates (16) are arranged staggeredly, so that an S-shaped flow channel is formed inside the condensation groove (11); a plurality of end plate fixing holes (15) and a plurality of end plate positioning holes (14) are evenly distributed around the end plate (1), and the end plate positioning holes are arranged inside the end plate fixing holes (15). The anode (2) includes an anode plate (21) and an anode electrode (22), and the anode electrode (22) is arranged close to the cation exchange membrane (3); the anode plate (21) is of a plate-like structure, with a parallel flow field (211) formed in the middle, an anode plate sealing groove (214) formed around the parallel flow field (211), and a sealing ring is arranged in the anode plate sealing groove (214); an anode plate liquid inlet hole (212) and a central chamber liquid outlet hole (218) are arranged on one side wall of the anode plate (21), and an anode plate liquid outlet hole (213) and a central chamber liquid inlet hole (217) are arranged on the other side wall. The central chamber liquid outlet hole (218) is located above the anode plate liquid inlet hole (212), and the anode plate liquid outlet hole (213) is located above the central chamber liquid inlet hole (217); the anode plate liquid inlet hole (212) and the anode plate liquid outlet hole (213) are communicated with the parallel flow field (211), and both the central chamber liquid inlet hole (217) and the central chamber liquid outlet hole (218) are L-shaped holes, one end of which is flush with the side wall of the anode plate (21), and the other end is arranged on the end face between the parallel flow field (211) and the anode plate sealing groove (214); a plurality of anode plate electrode interfaces (219) are arranged on the top of the anode plate (21); a plurality of anode plate positioning holes (215) and a plurality of central chamber connection holes (216) are evenly distributed around the anode plate (21), and the anode plate positioning holes (215) and the central chamber connection holes (216) are arranged staggeredly. The number of anode plate positioning holes (215) is the same as that of the end plate positioning holes (14), and they are arranged corresponding to each other in position. An electrolyte fixing structure and a fluid distribution structure are formed on the central chamber (4); the electrolyte fixing structure includes two groups of electrolyte tank groups, one group is arranged in the middle of the front of the central chamber (4), and the other group is arranged in the middle of the back of the central chamber (4), and the two groups of electrolyte tank groups are arranged correspondingly; each group of electrolyte tank groups includes a plurality of electrolyte tanks (41) arranged at equal intervals and having the same size; the fluid distribution structure includes a transverse fluid distribution structure and a longitudinal fluid distribution structure; the longitudinal fluid distribution structure includes a plurality of longitudinal fluid guiding grooves (42) evenly distributed on the wide sides of the electrolyte tanks (41), and the longitudinal fluid guiding grooves (42) are opened along the length direction of the electrolyte tanks (41); the transverse fluid distribution structure includes two transverse fluid guiding grooves (43) arranged at both ends of the length direction of the electrolyte tank group on the front of the central chamber (4) and a plurality of transverse fluid distribution columns (44) arranged inside the transverse fluid guiding grooves (43), the plurality of transverse fluid distribution columns (44) are arranged at intervals, and the transverse fluid distribution columns (44) are coaxially arranged with the transverse fluid guiding grooves (43); the longitudinal fluid guiding grooves (42) on the front of the central chamber (4) communicate the electrolyte tanks (41) with the transverse fluid guiding grooves (43). The cathode (6) includes a cathode gas diffusion electrode (62), a cathode gasket (63), and a cathode plate (61) arranged in sequence; the cathode gas diffusion electrode (62) is arranged close to the anion exchange membrane (5).

2. The large-area solid electrolyte reactor according to claim 1, wherein: The parallel flow field (211) is composed of a groove formed in the middle of the end face of the anode plate (21) and a plurality of flow guiding plates evenly distributed in the groove, the plurality of flow guiding plates are parallel and arranged at intervals, and longitudinal flow channels are formed in the middle intervals; the upper and lower ends of the flow guiding plates are arranged at intervals with the groove wall, and transverse flow channels are formed in the middle intervals; the anode plate liquid inlet hole (212) communicates with the lower transverse flow channel; the anode plate liquid outlet hole (213) communicates with the upper transverse flow channel.

3. The large-area solid electrolyte reactor according to claim 1, characterized in that: A plurality of central chamber positioning holes (45) and a plurality of connection holes (46) are evenly distributed around the central chamber (4), and the central chamber positioning holes (45) and the connection holes (46) are arranged alternately, the number of the central chamber positioning holes (45) is the same as that of the end plate positioning holes (14), and they are arranged corresponding to each other in position.

4. The large-area solid electrolyte reactor according to claim 1, wherein: The cathode gasket (63) is of a long rectangular frame structure, and positioning holes with the same number and position as those of the end plate positioning holes (14) are arranged at its four corners; the length and width of the cathode gas diffusion electrode (62) are greater than the length and width of the inner circle of the cathode gasket (63).

5. The large-area solid electrolyte reactor according to claim 1, characterized in that: A serpentine flow field (611) is formed in the middle of the cathode plate (61), and a cathode plate sealing groove (612) is formed around the serpentine flow field (611). A sealing ring is arranged in the cathode plate sealing groove (612); cathode gas inlets (615) and cathode gas outlets (616) are respectively formed on both side walls of the cathode plate (61). The cathode gas inlets (615) and the cathode gas outlets (616) are arranged diagonally, and the horizontal position of the cathode gas inlets (615) is higher than the horizontal position of the cathode gas outlets (616); a plurality of cathode plate positioning holes (613) are evenly distributed on the edge of the cathode plate (61). The number of the cathode plate positioning holes (613) is the same as that of the end plate positioning holes (14), and they are arranged corresponding to each other in position; a plurality of cathode plate electrode interfaces (614) are arranged on the top of the cathode plate (61).

6. The large-area solid electrolyte reactor according to claim 5, wherein: The serpentine flow field (611) is composed of a serpentine groove formed in the cathode plate (61) and a plurality of serpentine flow guiding ridges arranged in the serpentine groove; the inlet and outlet of the serpentine flow field (611) are arranged diagonally.

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