A device for preparing a gas diffusion electrode

Abstract

This utility model discloses a device for preparing a gas diffusion electrode, comprising: a bottom support plate and a diffusion electrode carrier limiting groove, wherein the diffusion electrode carrier limiting groove is disposed on the upper end of the bottom support plate; and a roller baffle disposed on the outer side of the upper end of the bottom support plate. This device for preparing a gas diffusion electrode uses a handle to move the front and rear slurry coating rollers on the roller movement track groove, making the coating process more controllable. Different specifications of the structure can be selected according to usage needs, facilitating large-scale use. By pulling the movement of the front and rear slurry coating rollers and connecting the pump connecting hose to the slurry output connector, controllable and uniform preparation of the electrode catalyst is achieved, providing a simple and effective method and equipment for large-scale mass production.

Description

Technical Field

[0001] This invention relates to the field of electrochemical technology, specifically to a device for preparing a gas diffusion electrode. Background Technology

[0002] Compared with traditional fossil fuel refining and chemical industry, electrocatalysis technology has a wide range of advantages and multiple applications. Electrocatalysis methods have high activity and product selectivity, and can be controlled by catalysts, electrolytes, interfaces, and potentials. At the same time, it solves problems such as fossil fuel use, CO2 release, and toxic reagents.

[0003] The surface microstructure and state of the diffusion electrode are important factors affecting electrocatalytic performance, and the preparation method of the electrode directly affects the surface structure of the electrode. Existing methods for preparing diffusion electrodes mainly include roll coating, spray coating, drop coating, and roller coating. Roll coating only adheres a layer to the surface of the electrode carrier, which requires the carrier to be flexible and the slurry to be of high quality. At the same time, it is impossible to control the depth and density of the slurry in the electrode carrier. Spray coating has similar problems to roll coating and also has the problem of slurry being sprayed to the surrounding area, wasting a lot of slurry. Drop coating causes uneven distribution of catalyst slurry and makes it impossible to mass-produce diffusion electrodes. Utility Model Content

[0004] The purpose of this section is to outline some aspects of the embodiments of this utility model and to briefly introduce some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of this section, the abstract, and the title, and such simplifications or omissions should not be used to limit the scope of this utility model.

[0005] 1. Technical problems to be solved:

[0006] To address the existing problems in the preparation of diffusion electrodes, such as roll coating, spray coating, drop coating, and roller coating, the present invention is proposed. Roll coating only adheres a layer to the surface of the electrode carrier, which requires a flexible carrier and high-quality slurry. It also cannot control the depth and density of the slurry in the electrode carrier. Spray coating has similar problems to roll coating and also results in slurry being sprayed to the surrounding area, wasting a lot of slurry. Drop coating causes uneven distribution of catalyst slurry and cannot mass-produce diffusion electrodes.

[0007] Therefore, the purpose of this invention is to provide a device for preparing a gas diffusion electrode that can adapt to different types of carriers and slurries. This invention also provides a method for preparing a gas diffusion electrode that can achieve controllable loading of different electrode carriers and different catalyst slurries, thereby enabling mass production of diffusion electrodes.

[0008] 2. Technical Solution:

[0009] To solve the above-mentioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution:

[0010] An apparatus for preparing a gas diffusion electrode includes: a bottom support plate and a diffusion electrode carrier limiting groove, wherein the diffusion electrode carrier limiting groove is welded to the upper end of the bottom support plate;

[0011] A roller baffle is welded to the outer upper part of the bottom support plate, and a roller movement track groove is provided on the side wall of the roller baffle.

[0012] A front slurry coating roller, wherein the rolling end of the front slurry coating roller is rotatably connected to the roller moving track groove, and the front slurry coating roller has threads;

[0013] A post-slurry coating roller, wherein the rolling end of the post-slurry coating roller is rotatably connected to the roller moving track groove, and the post-slurry coating roller has threads;

[0014] The catalyst slurry outlet is located at the lower end of the front slurry coating roller and the upper end of the rear slurry coating roller. The catalyst slurry is adhered to the threads on the front slurry coating roller and the rear slurry coating roller through the catalyst slurry outlet, which can better perform the coating work.

[0015] The roller fixing shaft is rotatably connected to the outer side of the moving ends of the front slurry coating roller and the rear slurry coating roller.

[0016] A roller movable bracket, which is rotatably connected to the outside of the roller fixed shaft;

[0017] The handle is welded to the middle section of the roller moving bracket. The handle can change the relative position of the roller moving bracket and the roller fixed shaft to pull the front slurry coating roller and the rear slurry coating roller to move, so as to complete the coating work.

[0018] In a preferred embodiment of the gas diffusion electrode preparation device of this utility model, a slurry outlet fixing bracket is welded to the outside of the roller fixing shaft, a slurry outlet connector is connected to the upper end of the catalyst slurry outlet, a pump connecting hose is connected to the outside of the slurry outlet connector, and the catalyst slurry outlet and the slurry outlet connector are welded through the slurry outlet fixing bracket.

[0019] In a preferred embodiment of the gas diffusion electrode preparation device of this utility model, the handle is provided with a hollow structure in the middle, which can reduce the weight of the handle and make it lighter to use.

[0020] In a preferred embodiment of the gas diffusion electrode preparation apparatus of this utility model, the lower end of the catalyst slurry outlet is located at the upper end of the area between the front slurry coating roller and the rear slurry coating roller, which can better perform the coating work.

[0021] 3. Beneficial effects:

[0022] Compared with the prior art, the beneficial effects of this utility model are:

[0023] The apparatus for preparing this gas diffusion electrode uses a handle to drive the front slurry coating roller and the rear slurry coating roller to move on the roller moving track groove, making the coating process more controllable. Different specifications of the structure can also be selected according to the needs of use, which is convenient for large-scale use.

[0024] This apparatus for preparing gas diffusion electrodes achieves controllable and uniform preparation of electrode catalysts by moving the front and rear slurry coating rollers and connecting the pump to the slurry output connector via a hose. This provides a simple and effective method and equipment for large-scale mass production. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0026] Figure 1 This is a schematic diagram of the overall structure of the apparatus for preparing a gas diffusion electrode according to the present invention.

[0027] Figure 2 This is a schematic diagram of the front slurry coating roller structure of the gas diffusion electrode preparation device of this utility model;

[0028] Figure 3This is a schematic diagram of the handle structure of the gas diffusion electrode preparation device of this utility model.

[0029] The following are the labels in the diagram: 1. Bottom support plate; 2. Diffusion electrode carrier limiting groove; 3. Roller baffle; 4. Front slurry coating roller; 5. Rear slurry coating roller; 6. Roller moving track groove; 7. Catalyst slurry output port; 8. Slurry output connector; 9. Slurry output port fixing bracket; 10. Roller fixing shaft; 11. Roller moving bracket; 12. Handle. Detailed Implementation

[0030] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0031] This utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not be construed as limiting the scope of protection of this utility model. In actual manufacturing, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0032] The orientation or positional relationship indicated in the terminology is based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing the present invention and simplifying the description. It is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0033] The term "connection method" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] The embodiments of this utility model will now be described in further detail with reference to the accompanying drawings.

[0035] This utility model provides an overall structural schematic diagram of an embodiment of a gas diffusion electrode fabrication device, including:

[0036] Please see Figures 1-3 The apparatus for preparing a gas diffusion electrode according to this embodiment includes: a bottom support plate 1 and a diffusion electrode carrier limiting groove 2, wherein the diffusion electrode carrier limiting groove 2 is welded to the upper end of the bottom support plate 1.

[0037] The roller baffle 3 is welded to the outer side of the upper end of the bottom support plate 1, and the side wall of the roller baffle 3 is provided with a roller moving track groove 6;

[0038] The rolling end of the front slurry coating roller 4 is tumblingly connected to the roller moving track groove 6, and the front slurry coating roller 4 has threads;

[0039] The rolling end of the post-slurry coating roller 5 is tumblingly connected to the roller moving track groove 6, and the post-slurry coating roller 5 has threads;

[0040] The lower end of the catalyst slurry outlet 7 is located at the upper end of the front slurry coating roller 4 and the rear slurry coating roller 5. The catalyst slurry is adhered to the threads on the front slurry coating roller 4 and the rear slurry coating roller 5 through the catalyst slurry outlet 7, which can better perform the coating work.

[0041] The outer side of the moving end of the front slurry coating roller 4 and the rear slurry coating roller 5 is rotatably connected to the roller fixing shaft 10;

[0042] The roller moving bracket 11 is rotatably connected to the outside of the roller fixed shaft 10;

[0043] The handle 12 is welded to the middle section of the roller moving bracket 11. The handle 12 can change the relative position of the roller moving bracket 11 and the roller fixed shaft 10 to pull the front slurry coating roller 4 and the rear slurry coating roller 5 to move and complete the coating work.

[0044] It is worth noting that, in order to better transport the catalyst slurry, specifically, a slurry outlet fixing bracket 9 is welded to the outside of the roller fixing shaft 10, and a slurry outlet connector 8 is connected to the upper end of the catalyst slurry outlet 7. A pump connecting hose is connected to the outside of the slurry outlet connector 8. The catalyst slurry outlet 7 and the slurry outlet connector 8 are welded through to the slurry outlet fixing bracket 9.

[0045] To further explain, for better use, the handle 12 has a hollow structure in the middle, which reduces its weight and makes it lighter to use.

[0046] Finally, for better coating, specifically, the lower end of the catalyst slurry outlet 7 is located at the upper end of the area between the front slurry coating roller 4 and the rear slurry coating roller 5, which allows for better coating.

[0047] Please see Figures 1-3 The method for preparing a gas diffusion electrode according to this embodiment includes the following steps:

[0048] S1: Cut the size of the load carrier according to the width of the diffusion electrode carrier limiting groove 2, and place the carrier in the diffusion electrode carrier limiting groove 2. Different electrode carriers can be coated with different slurry compression depths by selecting electrode carrier limiting grooves of different depths.

[0049] S2: Connect the catalyst slurry to the slurry output connector 8 via the pump connection hose, control the slurry output speed of the pump connection hose, and let the slurry drip from the slurry output port onto the front slurry coating roller 4 and the rear slurry coating roller 5.

[0050] S3: Hold the handle 12, adjust the angle of the roller moving bracket 11, pull the handle 12, and push the front slurry coating roller 4 and the rear slurry coating roller 5 to move on the carrier surface, so that the catalyst slurry is evenly coated on the carrier surface. The coating of slurries of different viscosities can be achieved by changing the distance between the front slurry coating roller 4 and the rear slurry coating roller 5 and the thread depth on the front slurry coating roller 4 and the rear slurry coating roller 5.

[0051] S4: Select diffusion electrode support limiting groove 2 with different thicknesses, coat the electrode, and control the coating depth of catalyst slurry on the support to prepare integrated electrodes with different catalytic performance.

[0052] Combination Figure 1 This embodiment provides an apparatus for preparing a gas diffusion electrode and a method for preparing a gas diffusion electrode, which serves as Example 1 of this embodiment:

[0053] To prepare a 100 cm² two-dimensional electrode, a catalyst slurry with a viscosity of 0.05–2 Pa·s was prepared. The flow rate of the peristaltic pump was controlled at 15 ml / min, and the catalytic loading on the electrode surface was controlled at 10–30 mg / cm². A 1 mm thick carbon paper was selected as the carrier for the two-dimensional electrode, and the depth of the limiting groove 2 of the diffusion electrode carrier was selected at 0.9 mm. The two-dimensional electrode was prepared by delivering the slurry to the front slurry coating roller 4 and the rear slurry coating roller 5 through the peristaltic pump and slowly pushing the handle 12 to uniformly disperse the slurry on the carbon paper. After preparation, the carbon felt was dried to complete the initial preparation of the electrode.

[0054] Example 2: Preparation of a 500cm² three-dimensional electrode. A catalyst slurry with a viscosity of 0.05-2 Pa·s was prepared. The flow rate of the peristaltic pump was controlled at 15-50 ml / min, and the catalytic loading on the electrode surface was controlled at 30-50 mg / cm². A 4 mm thick graphite felt was selected as the carrier for the three-dimensional electrode. The depth of the diffusion electrode carrier limiting groove 2 was selected at 3.5-3.8 mm. The three-dimensional electrode was prepared by conveying the slurry to the front slurry coating roller 4 and the rear slurry coating roller 5 through the peristaltic pump and slowly pushing the handle 12 to uniformly disperse the slurry on the carbon felt. After preparation, the carbon felt was dried to complete the initial preparation of the electrode.

[0055] Example 3: Preparation of a 1000cm² three-dimensional electrode. A catalyst slurry with a viscosity of 0.05-3 Pa·s was prepared. The flow rate of the peristaltic pump was controlled at 35-60 ml / min, and the catalytic loading on the electrode surface was controlled at 30-50 mg / cm². A 2 mm thick graphite felt was selected as the carrier for the three-dimensional electrode. The depth of the diffusion electrode carrier limiting groove 2 was selected to be 1.8 mm. The three-dimensional electrode was prepared by conveying the slurry to the front slurry coating roller 4 and the rear slurry coating roller 5 through the peristaltic pump and slowly pushing the handle 12 to make the slurry evenly dispersed on the carbon felt. After preparation, the carbon felt was dried to complete the initial preparation of the electrode.

[0056] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An apparatus for preparing a gas diffusion electrode, characterized by comprising: It includes: a bottom support plate (1) and a diffusion electrode carrier limiting groove (2), wherein the diffusion electrode carrier limiting groove (2) is disposed on the upper end of the bottom support plate (1); Roller baffle (3), the roller baffle (3) is disposed on the outer side of the upper end of the bottom support plate (1), and the side wall of the roller baffle (3) is provided with a roller moving track groove (6); The front slurry coating roller (4) has its rolling end set on the roller moving track groove (6); The rolling end of the post-slurry coating roller (5) is set on the roller moving track groove (6); Catalyst slurry outlet (7), the lower end of which is located at the upper end of the front slurry coating roller (4) and the rear slurry coating roller (5); Roller fixing shaft (10) is disposed on the outside of the moving ends of the front slurry coating roller (4) and the rear slurry coating roller (5); A roller moving bracket (11) is disposed outside the roller fixed shaft (10); Handle (12), which is located in the middle section of the roller moving bracket (11).

2. The apparatus for producing a gas diffusion electrode according to claim 1, wherein A slurry outlet fixing bracket (9) is provided on the outside of the roller fixing shaft (10), and a slurry outlet connector (8) is provided at the upper end of the catalyst slurry outlet (7). A pump connecting hose is connected to the outside of the slurry outlet connector (8). The catalyst slurry outlet (7) and the slurry outlet connector (8) are set on the slurry outlet fixing bracket (9).

3. The apparatus for producing a gas diffusion electrode according to claim 2, wherein The handle (12) has a hollowed-out structure in the middle.

4. The apparatus for producing a gas diffusion electrode according to claim 3, wherein The lower end of the catalyst slurry outlet (7) is located at the upper end of the area between the front slurry coating roller (4) and the rear slurry coating roller (5).

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