Suction filtration device for preparing gas diffusion electrode

Abstract

The utility model discloses a suction filtration device for preparing a gas diffusion electrode, which comprises a suction filtration bottle and vacuumizing equipment connected with the suction filtration bottle, the top end of the suction filtration bottle is opened and is hermetically connected with a suction filtration head, and a vertically through suction filtration cup is mounted on the suction filtration head; the suction filtration head comprises a feeding area at the upper part and a funnel area at the lower part; the bottom face of the feeding area is rectangular, and a hollow area is formed in the middle and used for being communicated with the funnel area. A sealing gasket, a supporting net, a filter membrane and a gas diffusion electrode carrier are sequentially placed in the feeding area from bottom to top; a hole in the middle of the sealing gasket corresponds to the hollow area; after the suction filtration cup is mounted on the suction filtration head, the lower end of the suction filtration cup corresponds to the peripheral edge position of the bottom surface of the feeding area and sequentially compresses the gas diffusion electrode carrier, the filter membrane, the supporting net and the sealing gasket from top to bottom to form sealing. According to the utility model, uniform suction filtration can be realized, liquid leakage is avoided, a square gas diffusion electrode is directly prepared, and the electrode preparation cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of experimental equipment, and particularly relates to a suction filtration device for preparing a gas diffusion electrode. Background Art

[0002] The gas diffusion electrode has a hydrophobic structure, and the substrate is usually a porous carbon material such as carbon felt or carbon cloth, which is widely used in the oxygen reduction reaction. The gas diffusion electrode is usually prepared by a suction filtration method to modify a hydrophobic agent and a conductive agent into the three-dimensional structure of a carrier such as carbon felt.

[0003] The Buchner funnel is a commonly used suction filtration instrument. However, the common Buchner funnel lacks an electrode fixing area, resulting in liquid being suction filtered from all around to the suction flask, and the electrode cannot be uniformly modified. The patent specification with the publication number CN215085234U discloses a suction filtration device with anti-clogging filter holes and high suction filtration efficiency. Although the Buchner funnel has been improved, it is still not suitable for the suction filtration of gas diffusion electrodes.

[0004] In addition, the suction filtration cup and the suction filtration head of the glass sand core suction filtration device are only clamped by a stopcock clip and have no slot structure. If an electrode with a certain thickness is clamped in the middle, it is easy to cause poor sealing and liquid leakage.

[0005] In addition, all the suction filtration devices sold on the market are circular, and after preparation, they need to be cut into rectangular electrodes, resulting in waste of materials and reagents.

[0006] Therefore, it is necessary to improve the suction filtration device to make the suction filtration uniform, avoid liquid leakage, and directly prepare a rectangular gas diffusion electrode, so as to reduce the electrode preparation cost. Summary of the Utility Model

[0007] In view of the above technical problems and deficiencies in the art, the utility model provides a suction filtration device for preparing a gas diffusion electrode. By improving the suction filtration cup and the suction filtration head, the suction filtration is made uniform, liquid leakage is avoided, and a square gas diffusion electrode is directly prepared, thereby avoiding waste of reagents and consumables during the preparation process and reducing the electrode preparation cost.

[0008] The specific technical solution is as follows:

[0009] A suction filtration device for preparing a gas diffusion electrode includes a suction flask and a vacuum pumping device connected to the suction flask. The top of the suction flask is open and is hermetically connected to a suction filtration head, and a suction filtration cup with an upper and lower through hole is installed on the suction filtration head;

[0010] The suction filtration head includes a feeding area at the upper part and a funnel area at the lower part; the bottom surface of the feeding area is rectangular and has a hollow area in the middle for communicating with the funnel area; a sealing gasket, a support mesh, a filter membrane, and a gas diffusion electrode carrier are sequentially placed in the feeding area from bottom to top; a hole is opened in the middle of the sealing gasket corresponding to the hollow area;

[0011] After the suction filtration cup is installed on the suction filtration head, the lower end of the suction filtration cup corresponds to the bottom peripheral edge position of the feeding area, and successively presses the gas diffusion electrode carrier, the filter membrane, the support net and the gasket from top to bottom to form a seal.

[0012] Herein, a usage method of the above-mentioned suction filtration device for preparing a gas diffusion electrode is provided:

[0013] Connect the suction filtration flask and the vacuum pumping device, hermetically connect the suction filtration head and the suction filtration flask, successively place the gasket, the support net, the filter membrane and the gas diffusion electrode carrier (such as carbon felt, etc.) in the feeding area at the top of the suction filtration head, place the suction filtration cup on the top of the suction filtration head, the lower end of the suction filtration cup corresponds to the bottom peripheral edge position of the feeding area, and successively presses the gas diffusion electrode carrier, the filter membrane, the support net and the gasket from top to bottom to form a seal;

[0014] When performing suction filtration, first start the vacuum pumping device, and then pour the mixed solution containing the binder and the catalyst into the suction filtration cup to prepare the gas diffusion electrode;

[0015] After the suction filtration is completed, the vacuum pumping device can be turned off first. After removing the suction filtration cup, pick up the prepared gas diffusion electrode, filter membrane, support net and gasket in sequence, and detach the suction filtration head and the suction filtration flask in sequence; clean the detached device and equipment.

[0016] In some embodiments, for the suction filtration device for preparing a gas diffusion electrode, the top opening of the suction filtration flask is hermetically connected to the suction filtration head through a sealing plug.

[0017] In some embodiments, for the suction filtration device for preparing a gas diffusion electrode, a pool body is provided between the feeding area and the funnel area, and the hollowed-out area at the bottom of the feeding area is communicated with the funnel area through the pool body.

[0018] In some embodiments, for the suction filtration device for preparing a gas diffusion electrode, the outer periphery of the feeding area is a connecting part;

[0019] A convex part corresponding to the connecting part is formed by the circumferential outward extension of the outer side wall of the suction filtration cup;

[0020] After the suction filtration cup is installed on the suction filtration head, the convex part and the connecting part are clamped and sealed through a clamping mechanism.

[0021] In some embodiments, for the suction filtration device for preparing a gas diffusion electrode, the outer edge dimension of the lower end of the suction filtration cup matches the inner edge dimension of the feeding area, having the functions of stabilizing the suction filtration cup and preventing liquid leakage.

[0022] In some embodiments, for the suction filtration device for preparing a gas diffusion electrode, the pore size of the support net is 1-3 mm.

[0023] Compared with the prior art, the beneficial effects of the present utility model are:

[0024] By using the suction filtration device for preparing gas diffusion electrodes of the present utility model, a gas diffusion electrode carrier such as carbon felt can be placed in the feeding area above the suction filtration head, and then anastomotically fixed through the lower end of the suction filtration cup, avoiding liquid flowing from the surrounding to the suction filtration bottle and external leakage, reducing reagent waste and achieving uniform modification of gas diffusion electrode carriers such as carbon felt; by changing the main body bottom surface shapes of the suction filtration cup and the suction filtration head into rectangular structures, rectangular gas diffusion electrodes can be directly prepared, avoiding waste of consumables caused by cutting from circular to square, and reducing the electrode preparation cost. Description of the Drawings

[0025] Figure 1 FIG. is a schematic structural diagram of a suction filtration device for preparing gas diffusion electrodes in one of the specific embodiments;

[0026] Figure 2 FIG. is a front view structural diagram of the suction filtration head of a suction filtration device for preparing gas diffusion electrodes in one of the specific embodiments;

[0027] Figure 3 FIG. is a front view structural diagram of the suction filtration cup of a suction filtration device for preparing gas diffusion electrodes in one of the specific embodiments;

[0028] In the figure: 1, suction filtration cup; 2, support net; 3, sealing gasket; 4, suction filtration head; 5, sealing plug; 6, suction filtration bottle; 7, vacuum pumping device; 11, convex part; 41, feeding area; 42, pool body; 43, funnel area; 44, connecting part. Specific Embodiments

[0029] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present utility model and not to limit the scope of the present utility model.

[0030] See Figures 1 to 3 , a suction filtration device for preparing gas diffusion electrodes, comprising a suction filtration cup 1, a suction filtration head 4, a sealing plug 5, a suction filtration bottle 6 and a vacuum pumping device 7. The upper side opening of the suction filtration bottle 6 is connected to the vacuum pumping device 7 through a silica gel hose. The top opening of the suction filtration bottle 6 is hermetically connected to the lower part of the suction filtration head 4 through the sealing plug 5. The sealing plug 5 can specifically be a silica gel plug. The suction filtration cup 1 is vertically through and is installed on the suction filtration head 4.

[0031] See Figure 2, the suction filter head 4 includes a feed zone 41 at the upper part and a lower conical funnel zone 43. The funnel zone 43 is used for sealing connection with a suction filter flask 6 through a sealing plug 5. A pool body 42 is also provided between the feed zone 41 and the funnel zone 43. The feed zone 41 is an overall rectangular groove structure with a connecting part 44 on the outer periphery. The bottom surface of the feed zone 41 is rectangular and has a hollowed-out area in the middle, and this hollowed-out area is the opening area of the top surface of the pool body 42. The pool body 42 is an overall rectangular shape, and there is an opening area in the middle of the bottom surface, and this opening area is the opening area of the top surface of the funnel zone 43. The above structural design enables the hollowed-out area on the bottom surface of the feed zone 41 to communicate with the funnel zone 43 through the pool body 42. During use, a sealing gasket 3, a support mesh 2, a filter membrane, and a gas diffusion electrode carrier are sequentially placed in the feed zone 41 from bottom to top. The opening in the middle of the sealing gasket 3 corresponds to the hollowed-out area. The material of the sealing gasket 3 can be silica gel, specifically a rectangular sealing ring. The support mesh 2 can play a role in uniformly exhausting air and supporting the filter membrane and the gas diffusion electrode carrier. The support mesh 2 can specifically be a stainless steel mesh, and the pore diameter can be 1 - 3 mm.

[0032] See Figure 3 , a convex part 11 corresponding to the connecting part 44 extends outward circumferentially in the area near the bottom of the outer side wall of the suction filter cup 1. The structures of the suction filter cup 1 above and below the convex part 11 can specifically be rectangular, and the sizes can be the same or different. The outer edge size of the lower end of the suction filter cup 1 matches the inner edge size of the feed zone 41, having the function of preventing liquid leakage. After the suction filter cup 1 is installed on the suction filter head 4, the lower end of the suction filter cup 1 corresponds to the four peripheral edge positions of the bottom surface of the feed zone 41 and sequentially presses the gas diffusion electrode carrier, the filter membrane, the support mesh 2, and the sealing gasket 3 from top to bottom to form a seal, and the convex part 11 and the connecting part 44 are clamped and sealed through a clamping mechanism. The clamping mechanism can specifically be a hose clamp, etc.

[0033] When using the above suction filtration device for preparing a gas diffusion electrode, for example: connect the side opening of the suction filter flask 6 and a vacuum device 7 with a silica gel hose; insert the sealing plug 5 into the top opening of the suction filter flask 6, and then insert the suction filter head 4 into the silica gel plug 5; sequentially place the sealing gasket 3, the support mesh 2, the filter membrane, and the gas diffusion electrode carrier (such as carbon felt) in the top groove feed zone 41 of the suction filter head 4; place the suction filter cup 1 on the top of the suction filter head 4, the lower end of the suction filter cup 1 corresponds to the four peripheral edge positions of the bottom surface of the feed zone 41 and sequentially presses the gas diffusion electrode carrier, the filter membrane, the support mesh 2, and the sealing gasket 3 from top to bottom to form a seal, and use a clamping mechanism to clamp the four sides (i.e., the connecting part 44 and the convex part 11) for further sealing.

[0034] During suction filtration, first start the vacuum device 7, and then pour a mixed solution containing a binder and a catalyst into the suction filter cup 1 to prepare a gas diffusion electrode.

[0035] After the suction filtration is completed, the vacuum pumping device 7 can be turned off first, the clamping mechanism can be removed, and after removing the suction filtration cup 1, the prepared gas diffusion electrode, filter membrane, support mesh 2 and gasket 3 can be picked up in sequence, and the suction filtration head 4, silica gel plug 5, suction filtration bottle 6 and silica gel hose can be detached in sequence; the detached devices and equipment can be cleaned.

[0036] In addition, it should be understood that after reading the above description of the present utility model, those skilled in the art can make various changes or modifications to the present utility model, and these equivalent forms also fall within the scope defined by the appended claims of this application.

Claims

1. A suction filtration device for preparing a gas diffusion electrode, comprising a suction filtration flask (6) and a vacuum pumping device (7) connected to the suction filtration flask (6), characterized in that, The top of the suction flask (6) is open and is hermetically connected to the suction head (4), and a suction cup (1) that penetrates up and down is installed on the suction head (4). The suction head (4) includes an upper feed area (41) and a lower funnel area (43); the bottom surface of the feed area (41) is rectangular and has a hollowed-out area in the middle for communicating with the funnel area (43); a sealing gasket (3), a support mesh (2), a filter membrane, and a gas diffusion electrode carrier are sequentially placed from bottom to top in the feed area (41); a hole is opened in the middle of the sealing gasket (3) corresponding to the hollowed-out area. After the suction cup (1) is installed on the suction head (4), the lower end of the suction cup (1) corresponds to the peripheral edge position of the bottom surface of the feed area (41), and the gas diffusion electrode carrier, the filter membrane, the support mesh (2), and the sealing gasket (3) are sequentially pressed from top to bottom to form a seal.

2. The suction filtration device for preparing a gas diffusion electrode according to claim 1, characterized in that, The top opening of the suction flask (6) is hermetically connected to the suction head (4) through a sealing plug (5).

3. The suction filtration device for preparing a gas diffusion electrode according to claim 1, wherein, A cell body (42) is provided between the feed area (41) and the funnel area (43), and the hollowed-out area on the bottom surface of the feed area (41) communicates with the funnel area (43) through the cell body (42).

4. The suction filtration device for preparing a gas diffusion electrode according to claim 1, characterized in that, The outer periphery of the feed area (41) is a connecting part (44). A convex part (11) corresponding to the connecting part (44) is formed by the outer circumferential extension of the outer side wall of the suction cup (1). After the suction cup (1) is installed on the suction head (4), the convex part (11) and the connecting part (44) are clamped and sealed by a clamping mechanism.

5. The suction filtration device for preparing a gas diffusion electrode according to claim 1, characterized in that, The outer edge dimension of the lower end of the suction cup (1) matches the inner edge dimension of the feed area (41).

6. The suction filtration device for preparing a gas diffusion electrode according to claim 1, characterized in that, The pore size of the support mesh (2) is 1 - 3 mm.

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