CN210052796U - Gas diffusion cathode assembly and battery assembly thereof - Google Patents
Gas diffusion cathode assembly and battery assembly thereof Download PDFInfo
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- CN210052796U CN210052796U CN201921043390.5U CN201921043390U CN210052796U CN 210052796 U CN210052796 U CN 210052796U CN 201921043390 U CN201921043390 U CN 201921043390U CN 210052796 U CN210052796 U CN 210052796U
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Abstract
The utility model provides a gas diffusion cathode assembly and battery pack thereof, gas diffusion cathode assembly include the body, and the opening side of body is equipped with gas diffusion cathode, and the wall of body and gas diffusion cathode enclose to close and form confined air chamber, are equipped with intake pipe, the outlet duct that communicates to the air chamber on the body. The utility model discloses a design independent gas diffusion negative pole subassembly, can be applied to galvanic cell or electrolytic bath, the usage is extensive, and the negative pole of being convenient for is changed, effectively reduces the maintenance cost.
Description
Technical Field
The utility model belongs to the electrochemistry field especially relates to a gas diffusion negative pole subassembly and battery pack thereof.
Background
The oxygen reduction reaction is a basic cathode reaction in energy, environment and chemical industry, and the gas diffusion cathode based on the reaction is the most common cathode form, and has the advantages of simple operation, low cost, environmental friendliness, high reliability and the like. At present, the gas diffusion cathode is widely applied to microbial fuel cells, hydrogen peroxide generation, electro-Fenton reaction and fuel cells in the field of energy. The existing primary battery or electrolytic cell based on the gas diffusion cathode is unreasonable in structural design, the gas diffusion cathode is usually an integral part of the cell body, and in the using process, if the gas diffusion cathode is damaged or other types of gas diffusion cathodes need to be replaced, the whole cell body can only be replaced, but the gas diffusion cathode cannot be replaced independently, so that the cost is high, and the use is inconvenient.
SUMMERY OF THE UTILITY MODEL
In view of the above shortcomings of the prior art, an object of the present invention is to provide a gas diffusion cathode assembly and a battery assembly thereof, which are used for solving the problems of inconvenient gas diffusion cathode replacement, high maintenance cost, etc. of the battery in the prior art.
In order to realize the above-mentioned purpose and other relevant purposes, the utility model provides a gas diffusion cathode assembly, which comprises a body, the opening side of body is equipped with gas diffusion cathode, the wall of body with gas diffusion cathode encloses to close and forms confined air chamber, be equipped with on the body intercommunication to intake pipe, the outlet duct of air chamber.
Optionally, the air inlet of the air inlet pipe is close to the bottom of the body.
The intake pipe can set up the lateral wall at the body for the air inlet is close to the bottom of body, also can set up at the top of body, and the intake pipe downwardly extending is close to the body bottom, makes gas and gaseous diffusion cathode fully contact.
Optionally, the gas outlet of the gas outlet pipe is located at the top of the body, and of course, the gas outlet of the gas outlet pipe close to the top of the body can also achieve sufficient contact between the gas and the cathode.
Alternatively, the gas diffusion cathode includes a current collecting layer, a carbon layer, an adhesive layer, and a waterproof gas permeable film layer are sequentially provided on one side of the current collecting layer, and a catalyst layer is provided on the other side of the current collecting layer.
Optionally, the current collecting layer is selected from metal meshes.
Optionally, the metal mesh is selected from at least one of titanium mesh, nickel mesh, stainless steel mesh. The mesh number of the stainless steel mesh is usually 100-300 meshes, and of course, the mesh is not limited to the above-listed materials, and metal meshes having good conductivity and durability are all suitable for the present invention.
Optionally, the carbon layer is located on a waterproof side of the collector layer.
Optionally, when the catalytic layer is selected from noble metal catalysts, the raw material of the carbon layer is selected from at least one of activated carbon and carbon black.
Optionally, the activated carbon in the carbon layer is: carbon black ═ 1-5: 1, preferably (1-3): specifically, 1:1, 2:1, 3:1, 4:1, 5:1 and the like may be mentioned.
Optionally, the noble metal catalyst is selected from platinum carbon catalysts.
Optionally, when the catalytic layer is selected from non-noble metal catalysts, the raw material of the carbon layer includes activated carbon and non-noble metal catalysts.
Optionally, the activated carbon in the carbon layer is: non-noble metal catalyst ═ 1-5: 1, preferably (1-3): specifically, 1:1, 2:1, 3:1, 4:1, 5:1 and the like may be mentioned.
Optionally, the non-noble metal catalyst is selected from at least one of carbon black, nitrogen/carbon doped carbon material, metal/nitrogen/carbon doped carbon material. The non-noble metal catalysts mentioned above are only partially listed, and other non-noble metal catalysts that react with an oxidant or produce hydrogen peroxide are also within the scope of the present invention.
Optionally, the waterproof breathable film layer is at least one selected from a Polytetrafluoroethylene (PTFE) waterproof breathable film and a Polyethylene (PE) high-molecular waterproof breathable film. The waterproof breathable film can be purchased from the market. The waterproof and breathable film is only partially listed, and other materials with similar functions are also within the protection scope of the invention.
The utility model also provides a battery pack, including cell body, positive pole and above-mentioned gas diffusion negative pole subassembly, positive pole, gas diffusion negative pole subassembly are located in the cell body.
Optionally, the anode and the gas diffusion cathode assembly are connected by an external circuit.
Optionally, the air inlet pipe is externally connected with a high-pressure air bottle used for conveying air into the air chamber.
Optionally, a drying agent accommodating chamber is arranged on a pipeline between the air inlet pipe and the high-pressure air bottle, and is used for drying the gas about to enter the air inlet pipe.
Optionally, a pressure reducing valve is arranged on a pipeline between the desiccant accommodating chamber and the high-pressure gas cylinder and used for reducing pressure of gas output by the high-pressure gas cylinder.
Optionally, a pressure gauge is arranged on a pipeline between the air inlet pipe and the drying agent accommodating chamber and used for measuring the air inlet pressure.
Optionally, the gas outlet pipe is externally connected with a flow controller for measuring and controlling the gas flow of the outlet gas.
Optionally, the air inlet end of the flow control meter is provided with a check valve for shutting off the air path when necessary.
Optionally, a resistor is arranged on the external circuit to form a primary battery.
Optionally, the anode is selected from any one of a microbial electrode, a photocatalytic electrode.
Optionally, a stirring rotor is further arranged in the cavity of the pool body.
Optionally, an electrochemical workstation is arranged on the external circuit.
Optionally, a reference electrode disposed within the cell body, the reference electrode connected to the electrochemical workstation.
Optionally, the anode is selected from platinum mesh electrodes.
As mentioned above, the gas diffusion cathode assembly and the battery assembly thereof of the present invention have the following advantages: the design of the independent gas diffusion cathode component can be applied to a primary battery or an electrolytic cell, the application is wide, the replacement of the cathode is convenient, and the maintenance cost is effectively reduced.
Drawings
Fig. 1 is a schematic structural view of a gas diffusion cathode according to embodiment 1 of the present invention.
Fig. 2 is a schematic structural view of a gas diffusion cathode assembly according to embodiment 1 of the present invention.
Fig. 3 is a schematic diagram of a battery structure according to embodiment 2 of the present invention.
Fig. 4 is a schematic diagram of a battery structure according to embodiment 3 of the present invention.
Fig. 5 is a diagram of an experimental apparatus for testing air permeability according to test example 1 of the present invention.
Fig. 6 is a graph showing the experimental results of the air permeability test of test example 1 of the present invention.
Fig. 7 shows a polarization curve of test example 2 of the present invention.
Fig. 8 shows a polarization curve of test example 3 of the present invention.
Fig. 9 shows a polarization curve of test example 4 of the present invention.
Description of reference numerals
1-Current collecting layer
2-carbon layer
3-adhesive layer
4-waterproof breathable film layer
5-catalytic layer
6-gas diffusion cathode
7-air cell
8-inlet pipe
81-air intake
9-outlet pipe
91-air outlet
10-main body
11-resistance
12-reference electrode
13-tank body
14-mixing rotor
15-Anode
16-pressure gauge
17-desiccant container
18-pressure reducing valve
19-high pressure gas cylinder
20-check valve
21-flow control meter
22-electrochemical workstation
23-double air chamber experimental device
24-air inlet chamber
25-air outlet chamber
26-air intake channel
27-pressure gauge
28-air outlet channel
29-flow meter
Detailed Description
The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.
Example 1
As shown in fig. 1, the gas diffusion cathode comprises a catalyst layer 5, a current collecting layer 1, a carbon layer 2, an adhesive layer 3 and a waterproof breathable film layer 4, wherein the adhesive layer 3 and the waterproof breathable film layer 4 are combined to form a diffusion layer.
The preparation steps are as follows:
(1) the current collecting layer is a metal mesh with good conductivity and durability, and can be a titanium mesh, a nickel mesh, a stainless steel mesh and the like. The mesh number of the stainless steel mesh is 100 meshes and 300 meshes.
(2) Coating a metal mesh waterproof side with a carbon layer, and the specific method comprises the following steps: adding powdered activated carbon (purchased from national pharmaceutical products chemical Co., Ltd., product number 10006629) and carbon black (Vulcan XC-72) into isopropanol solvent at a mass ratio of 3:1, wherein the total loading of the two carbon powders is 4mg/cm
2For isopropanolThe amount of the carbon powder is 40 mul/mg, after ultrasonic mixing, 10 wt% PTFE aqueous solution (purchased from Shanghai Hesen electric Co., Ltd., 60 wt% PTFE) and 5 wt% Nafion aqueous solution (purchased from Aldrich, Nafion117) are added, the amount of the added carbon powder is 8 mul/mg, after ultrasonic mixing, the mixture is evenly smeared on a metal net, and then natural drying is carried out.
(3) The diffusion layer is a commercially available waterproof and breathable film (commercially available) and is adhered to the carbon layer side with an adhesive made of PTFE (polytetrafluoroethylene) and Nafion (perfluorosulfonic acid resin). The preparation method of the adhesive comprises the following steps: at a ratio of 30. mu.L/cm
2Taking 60% PTFE solution, adding 5% Nafion solution into 60% PTFE solution according to the volume ratio of 5% Nafion to 60% PTFE solution of 1:10, and fully vibrating to form viscous paste-like adhesive.
(4) And (3) uniformly coating the adhesive on one side of the carbon layer, then pasting the waterproof breathable film on the adhesive, lightly pressing, keeping at 80 ℃ for 1h, evaporating water to dryness, and compacting for 5 minutes at normal pressure by using a tablet press. The resulting membrane was then held at 120 ℃ for 8 hours to polymerize the adhesive layer PTFE, forming a hydrophobic and porous PTFE adhesive layer.
(5) And loading a catalyst on the other side of the fired membrane, namely a catalyst layer. The catalyst is a platinum carbon catalyst.
The adhesive layer and the waterproof breathable film layer jointly form a gas diffusion layer of the gas diffusion cathode, so that sufficient gas permeability is provided, and meanwhile, the waterproof performance is high, and solution leakage is avoided. The adhesive layer enables the waterproof performance of the gas diffusion cathode to be independent of the waterproof breathable film, so that the waterproof breathable film with high cost performance and low cost can be selected, and the manufacturing cost is effectively reduced.
The carbon layer provides a higher specific surface area, so that a gas-liquid-solid three-phase interface with a higher specific surface area is formed between the binder layer and the carbon layer, and the mass transfer between the gas phase and the liquid phase of oxygen is effectively promoted.
The carbon layer also provides a large number of conductive interfaces for the catalyst layer, and overcomes the defect of small specific surface area of the metal mesh.
The waterproof breathable film is a Polytetrafluoroethylene (PTFE) waterproof breathable film for electronic devices/equipment or a Polyethylene (PE) high-molecular waterproof breathable film for building walls/roofs.
As shown in fig. 2, a gas diffusion cathode assembly comprises a body 10, a gas diffusion cathode 6 is arranged on the opening side of the body 10, and the wall of the body 10 and the gas diffusion cathode 6 enclose to form a closed gas chamber 7; the body 10 is provided with an air inlet pipe 8 and an air outlet pipe 9 communicated with the air chamber 7. This gas diffusion cathode assembly is independent subassembly, and the inseparable part on the electrode of no longer electrolytic cell or galvanic cell is installed to electrolytic cell or galvanic cell through the detachable mode, is convenient for change, need not to change whole electrolytic cell or galvanic cell again.
The gas diffusion cathode 6 may be the gas diffusion electrode shown in fig. 1, or may be another similar gas diffusion electrode.
In one embodiment, the gas inlet 81 of the gas inlet tube 8 is near the bottom of the body 10 so that the gas contacts the gas diffusion cathode 6 sufficiently to react sufficiently.
In one embodiment, the outlet 91 of the outlet tube 9 is located at the top of the body 10, again to promote adequate gas contact with the gas diffusion cathode 6.
Example 2
The combination of a separate gas diffusion cathode assembly with different anodes allows to obtain galvanic cells or electrolytic cells with different uses. One of the applied battery structures is shown in fig. 3. The battery comprises a battery body 13, wherein an anode 15 and a gas diffusion cathode assembly shown in figure 2 are arranged in a cavity of the battery body 13, the anode 15 is connected with the gas diffusion cathode assembly through an external circuit, and a resistor 11 can be arranged on the external circuit to form a primary battery, so that chemical energy is converted into electric energy.
In one embodiment, anode 15 is selected to produce an electrogenic microbial electrode to form a microbial fuel cell, a photocatalytic electrode to form a photocatalytic fuel cell, and a platinum mesh electrode to form an electrolytic cell.
In one embodiment, the gas diffusion cathode 6 is selected to produce a hydrogen peroxide oxygen reduction catalyst, and the cell assembly will be used to produce hydrogen peroxide.
In one embodiment, Fe is added to the electrolyte solution of the cell
2+/Fe
3+And controlling the pH value to be 1-4, wherein the battery device is used for electro-Fenton treatment of sewage.
In one embodiment, the inlet pipe 8 may receive air, oxygen, or any other gas that participates in the reaction.
In one embodiment, the inlet gas may be at normal pressure or a certain pressure, and the pressure of the gas diffusion cathode may be in a range of 0-0.2 mPa.
Optionally, a stirring rotor 14 is further disposed in the tank body 13 for stirring the solution.
Example 3
This example provides a cell structure for electrode performance analysis under pressure conditions, as shown in fig. 4.
The analysis system comprises a battery assembly shown in fig. 3, and further comprises an electrochemical workstation 22, a high-pressure gas cylinder 19, a pressure reducing valve 18, a drying agent accommodating chamber 17, a pressure gauge 16, a flow stopping valve 20 and a flow control meter 21, wherein the electrochemical workstation 22 is arranged on an external circuit in the embodiment, the resistor 11 in fig. 3 is replaced, and the anode 15 and the gas diffusion cathode 6 are connected to the electrochemical workstation 22.
In an embodiment, the air inlet pipe 8 is externally connected with a high-pressure air bottle 19 for conveying air into the air chamber 7, and the high-pressure air bottle 19 is located outside the chamber of the tank body 13, that is, the air inlet pipe 8 is externally connected with an air inlet source to supply air to the air chamber 7.
In one embodiment, a desiccant receiving chamber 17 is provided in the conduit between the inlet pipe 8 and the high pressure gas cylinder 19 for drying the gas to be introduced into the inlet pipe 8.
In an embodiment, a pressure reducing valve 18 is disposed on a pipeline between the desiccant accommodating chamber 17 and the high-pressure gas cylinder 21, and is used for performing pressure reduction treatment on gas output by the high-pressure gas cylinder 21, so as to avoid damage to the desiccant accommodating chamber 17 or safety risk caused by excessive gas pressure.
In one embodiment, a pressure gauge 16 is provided on the conduit between the inlet pipe 8 and the desiccant receiving chamber 17 for measuring the inlet pressure.
In one embodiment, the outlet pipe 9 is externally connected with a flow controller 21 for measuring the gas flow of the outlet gas.
In one embodiment, the air inlet end of the flow control meter 21 is provided with a check valve 20 for shutting off the air path if necessary.
In one embodiment, the anode 15 is connected to an electrochemical workstation 22.
In one embodiment, reference electrode 12 is also included disposed within cell body 13, reference electrode 12 also being connected to electrochemical workstation 22.
In one embodiment, the electrochemical workstation is connected by connecting the gas diffusion cathode laminated electrode lead wire to a working electrode clamp for electrochemical operation, connecting the anode to a counter electrode clamp, connecting the reference electrode to a reference electrode clamp, connecting the anode 15 to a platinum mesh electrode, connecting the gas supplied by the high pressure gas cylinder 19 to oxygen, air or any other gas participating in reaction and combination thereof, and optionally, connecting the gas desiccant in the desiccant container 17 to silica gel particle desiccant or activated alumina desiccant. The drying agent is arranged in a closed container, namely a drying agent accommodating chamber 17 which is connected with an air inlet pipeline through an inlet and an outlet, the drying agent accommodating chamber 17 is positioned at the downstream of a pressure reducing valve 18, a pressure meter 16 is connected with the air inlet pipeline and positioned at the downstream of the drying agent accommodating chamber 17, a check valve 20 is connected with an air outlet pipeline of an air inlet chamber 7, a flow control meter 21 is connected at the downstream of the check valve 20, the flow control meter 21 is used for measuring and controlling the flow of the air outlet, the outlet of the air outlet pipeline is connected with the atmosphere, and the flow control meter 21 can be a rotor flow control meter and is controlled within the range of.
The device has two modes of operation, a low pressure mode and a high pressure mode.
i) Low-pressure mode: when the air inlet pressure is lower than 0.1MPa, the low-pressure mode is adopted.
During the experiment, the check valve 20 is opened, the reducing valve 18 and the flow control meter 21 are adjusted, and the air inlet pressure is accurately controlled together. The pressure reducing valve 18 is a primary pressure control valve, and the pressure is controlled within a small range. The flow controller is a two-stage pressure controller, and the inlet pressure is accurately controlled by adjusting the flow of the gas flowing out of the gas outlet chamber according to the Bernoulli equation. The larger the outlet pipeline flow is, the smaller the gas pressure of the gas chamber is.
In one embodiment, a pressure reducing valve is selected having a pressure within the range of 0-1.6 MPa.
The pressure gauge 16 can be a high-precision mechanical pressure gauge of 0-0.1Mpa, or a high-precision digital pressure sensor.
ii) high pressure mode: and when the air inlet pressure is greater than 0.1MPa, the high-pressure mode is adopted.
During the experiment, the check valve 20 is closed, and the intake pressure is directly controlled by the pressure reducing valve 18.
In one embodiment, a pressure reducing valve is selected having a pressure in the range of 0-2MPa or 0-5 MPa.
In one embodiment, the pressure gauge 16 is a mechanical pressure gauge of 0-2MPa or 0-5MPa, or a high-precision digital pressure sensor.
Test example 1
This test example was conducted to test the performance of the gas diffusion cathode shown in fig. 1.
(1) The experimental device for testing the air permeability is shown in fig. 5, a gas diffusion cathode 6 is arranged in the middle of a double-air-chamber experimental device 23, and certainly, other materials to be tested can also be used, the gas diffusion cathode 6 divides the device into an air inlet chamber 24 and an air outlet chamber 25, an air inlet channel 26 is arranged on the air inlet chamber 24, a pressure gauge 27 is arranged on the air inlet channel 26 and used for measuring air inlet pressure, an air outlet channel 28 is arranged on the air outlet chamber 25, a flow meter 29 is arranged on the air outlet channel 28 and used for measuring air flow, and gas enters the air inlet chamber 24 from the air inlet channel 26, penetrates through the gas diffusion cathode 6 and is discharged to the atmosphere. During measurement, the gas pressure is controlled to be a constant value, and the flow of the gas chamber is measured at each pressure value, namely the ventilation quantity. The curve of the gas permeation quantity as a function of the pressure can be measured by gradually increasing the gas pressure.
(2) A200-mesh titanium mesh is adopted as a current collecting layer 1, and activated carbon is adopted: carbon layer was made of a mixture of carbon black 3:1 (mass ratio), and a gas diffusion cathode was prepared by referring to the method of example 1, and 5 kinds of waterproof permeable membranes were selected for preparation5 gas diffusion cathodes, denoted MM/WM # 1-MM/WM # 5, were prepared, all using 20 wt% platinum carbon catalyst. The waterproof breathable film is purchased from Puwei (Shanghai) sales and technical service center, and specific parameters are shown in table 1. The gas permeability of the gas diffusion cathode is tested and shown in FIG. 6, and the gas permeability is 4.3-10.5 mL/(min cm)
2kPa). Experimental results show that the gas diffusion cathode obtained by the waterproof breathable film assembling method has larger breathable quantity.
TABLE 1 waterproof and breathable PTFE film
Test example 2
The cell apparatus shown in fig. 4 was used to measure the performance under pressure conditions of 5 kinds of gas diffusion cathodes prepared in this test example. The battery uses platinum net as anode, and electrolyte solution is 0.1M NaOH and 0.2M NaNO
3The mixed aqueous solution of (1) was stirred at 1200rpm using a saturated calomel electrode as a reference electrode. 5 kinds of gas diffusion cathodes were assembled into a gas diffusion cathode assembly as a working electrode. The electrochemical workstation was CHI 760E (Shanghai Chenghua instruments, Inc.), and the polarization curve was measured.
The polarization curve measurement adopts a steady state polarization curve method: under constant potential, measuring the working current of the electrolytic cell for about 3 minutes, taking the average value of the current in the current stabilization stage for about 2 minutes to obtain stable current and potential points, measuring one point at intervals of 20mV, and finally obtaining a polarization curve in a certain potential range.
The measurement results are shown in FIG. 7, and the test conditions include atmospheric air, atmospheric oxygen, 10kPa oxygen, and 20kPa oxygen. The results show that the polarization curve does not change significantly with increasing oxygen pressure. When the source of gas is air, the polarization curve is only slightly lower than that under oxygen conditions. And no limiting current, i.e. a phase in which the current does not increase with the potential, is observed. This indicates that the gas diffusion cathode assembled by the present method has a large gas permeation amount, thereby greatly impairing the control of gas diffusion, thus indicating that the electrode performance is less affected by gas and pressure.
Test example 3
The polarization curves measured at different stirring speeds, i.e. 0, 400, 800, 1200rpm, for MM/WM # 3 and MM/WM # 2 prepared in test example 1 were selected according to the analytical method in test example 2 and are shown in FIG. 8. The gas diffusion cathode obtained by the waterproof breathable film assembling method is shown to have less influence on the performance of the gas diffusion cathode due to stirring. Therefore, the gas diffusion cathode prepared by the method can adopt the most economical operation conditions, namely normal pressure, air as a gas source, static conditions and the like, and simultaneously maintains efficient oxygen reduction performance. Therefore, the running cost can be effectively reduced.
Test example 4
The gas diffusion cathode of the present invention was also compared with three other gas cathodes. The CC/PDMS is a gas diffusion cathode prepared by taking carbon cloth (type B, E-TEK) as a current collecting layer and taking Polydimethylsiloxane (PDMS) as a diffusion layer. MM/PDMS is a gas diffusion cathode fabricated by using a 200-mesh titanium mesh as a current collector, loading a carbon layer (3: 1, by mass, carbon black) on one side, and then loading a PDMS diffusion layer on the carbon layer. MM/CB _9 is a viscous mixture prepared by taking a 200-mesh titanium mesh as a current collecting layer and mixing carbon black and 60% PTFE solution according to the mass ratio of 1:2, and the load of the carbon black is 9mg/cm
2Uniformly pressing and sticking the film on a titanium mesh to form a diffusion layer, and then carrying out heat treatment at 340 ℃ for 30 minutes. All gas diffusion cathodes were at 20% Pt/C (0.5 mg/cm)
2) As a catalytic layer.
The polarization curves are shown in FIG. 9, and the results show that the performance of the MM/WM gas diffusion cathode is significantly better than that of both CC/PDMS and MM/PDMS cathodes, and is almost the same as that of MM/CB _ 9.
To sum up, the utility model discloses a design independent gas diffusion negative pole subassembly, can be applied to primary cell or electrolytic cell, the usage is extensive, the negative pole of being convenient for is changed, effective reduction in production cost.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (12)
1. A gas diffusion cathode assembly characterized by: the gas diffusion device comprises a body (10), wherein a gas diffusion cathode (6) is arranged on the opening side of the body (10), a closed gas chamber (7) is formed by enclosing the wall of the body (10) and the gas diffusion cathode (6), and a gas inlet pipe (8) and a gas outlet pipe (9) communicated to the gas chamber (7) are arranged on the body (10).
2. The gas diffusion cathode assembly of claim 1, wherein: the air inlet (81) of the air inlet pipe (8) is close to the bottom of the body (10), and the air outlet (91) of the air outlet pipe (9) is located at the top of the body (10).
3. The gas diffusion cathode assembly of claim 1, wherein: the gas diffusion cathode (6) comprises a current collection layer (1), wherein a carbon layer (2), an adhesive layer (3) and a waterproof breathable film layer (4) are sequentially arranged on one side of the current collection layer (1), and a catalytic layer (5) is arranged on the other side of the current collection layer (1).
4. The gas diffusion cathode assembly of claim 3, wherein: the current collecting layer (1) is selected from a metal mesh, and the metal mesh is selected from at least one of a titanium mesh, a nickel mesh and a stainless steel mesh;
and/or, when the catalytic layer (5) is selected from noble metal catalysts, the raw material of the carbon layer (2) is selected from at least one of activated carbon and carbon black;
and/or when the catalytic layer (5) is selected from non-noble metal catalysts, the raw materials of the carbon layer comprise activated carbon and non-noble metal catalysts;
and/or the waterproof breathable film layer (4) is at least one selected from a polytetrafluoroethylene waterproof breathable film and a polyethylene high-molecular waterproof breathable film.
5. The gas diffusion cathode assembly of claim 4, wherein: the carbon layer (2) comprises, by mass, activated carbon: carbon black ═ 1-5: 1;
and/or, the activated carbon in the carbon layer is: non-noble metal catalyst ═ 1-5: 1.
6. the gas diffusion cathode assembly of claim 5, wherein: the carbon layer (2) comprises, by mass, activated carbon: carbon black ═ 1-3: 1, the noble metal catalyst is selected from platinum carbon catalysts;
and/or, the activated carbon in the carbon layer is: non-noble metal catalyst ═ 1-3: 1, the non-noble metal catalyst is selected from at least one of carbon black, nitrogen/carbon doped carbon material and metal/nitrogen/carbon doped carbon material.
7. A cell assembly, characterized by comprising a cell body (13), an anode (15) and a gas diffusion cathode assembly according to any of claims 1-4, the anode (15), gas diffusion cathode assembly being located within the cell body (13).
8. The battery assembly of claim 7, wherein: the anode (15) is connected with the gas diffusion cathode assembly through an external circuit.
9. The battery assembly of claim 7, wherein: intake pipe (8) external be used for to the high-pressure gas cylinder (19) of conveying gas in air chamber (7), intake pipe (8) with be equipped with drier on the pipeline between high-pressure gas cylinder (19) and hold room (17), be used for to entering soon the gas of intake pipe (8) is dried, drier hold room (17) with be equipped with relief pressure valve (18) on the pipeline between high-pressure gas cylinder (19) for the gas to high-pressure gas cylinder (19) output carries out decompression processing, intake pipe (8) with be equipped with pressure gauge (16) on the pipeline between drier holds room (17), be used for measuring inlet pressure.
10. The battery assembly of claim 7, wherein: the gas outlet pipe (9) is externally connected with a flow control meter (21) and used for measuring and controlling the gas flow of the gas outlet, and a stop valve (20) is arranged at the gas inlet end of the flow control meter (21).
11. The battery assembly of claim 8, wherein: the external circuit is provided with a resistor (11) to form a primary battery, the anode (15) is selected from any one of a microbial electrode and a photocatalytic electrode, and a stirring rotor (14) is further arranged in the cavity of the pool body (13).
12. The battery assembly of claim 8, wherein: the electrochemical cell is characterized in that an electrochemical workstation (22) is arranged on the external circuit, the electrochemical cell further comprises a reference electrode (12) arranged in the cell body (13), the reference electrode (12) is connected to the electrochemical workstation (22), and the anode (15) is selected from platinum mesh electrodes.
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| CN112591857A (en) * | 2020-12-07 | 2021-04-02 | 上海海事大学 | electro-Fenton gas diffusion electrode and preparation method thereof |
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|---|---|---|---|---|
| CN112591857A (en) * | 2020-12-07 | 2021-04-02 | 上海海事大学 | electro-Fenton gas diffusion electrode and preparation method thereof |
| CN112591857B (en) * | 2020-12-07 | 2023-03-14 | 上海海事大学 | electro-Fenton gas diffusion electrode and preparation method thereof |
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