A gas diffusion electrode and a method for manufacturing the same

Abstract

The application discloses a kind of gas diffusion electrode, belongs to electrocatalysis technical field, including gas diffusion layer, catalytic layer and outer wrapping layer, the gas diffusion layer and the catalytic layer are stacked and clamped in the inside of outer wrapping layer, the outer wrapping layer is tin foil, its preparation method includes the following steps: step one.Preparation paste body;Step two.paste body obtained in step one is rolled into a certain thickness of sheet by roll press;Step three.the prepared sheet of step two is placed in air drying oven and dried, then sheet and titanium mesh are stacked together and cold-pressed, and the sheet is cut into a certain size after cold-pressed;Step four.Preparation gas diffusion layer;Step five.Preparation catalytic layer;Step six.Preparation complete gas diffusion electrode;It can realize the simplification of electrolyte composition, and significantly reduce cell voltage, finally play the dual role of reducing material consumption and reducing electric energy consumption.

Description

Technical Field

[0001] This invention relates to the field of electrocatalysis technology, and more specifically, to a gas diffusion electrode and its preparation method. Background Technology

[0002] Gas diffusion electrodes have played a crucial role in the field of electrosynthesis since their development and widespread application. Their application in electrosynthesis has attracted considerable attention from researchers both domestically and internationally. Electrode performance is critical in electrochemical reactions; different electrodes produce different electrochemical efficiencies. Therefore, the development of highly catalytically active electrodes has led to the targeted treatment of pollutants in wastewater, enabling the desired electrochemical reactions and degradation. More researchers have begun in-depth studies of electrodes. Various high-efficiency electrodes have gradually emerged and are applied in various fields, playing an irreplaceable role and gaining widespread popularity. Gas diffusion electrodes, as highly catalytically active electrodes, possess advantages not found in other electrodes, leading to their widespread application.

[0003] However, gas diffusion electrodes suffer from drawbacks during electrosynthesis, including susceptibility to corrosion, high electrosynthesis potential, and complex electrolyte composition due to corrosion inhibition requirements. Therefore, a gas diffusion electrode that effectively avoids corrosion and simplifies electrolyte composition is urgently needed. Summary of the Invention

[0004] 1. Technical problems to be solved

[0005] In view of the problems existing in the prior art, the purpose of this invention is to provide a gas diffusion electrode and its preparation method, which can simplify the electrolyte composition and significantly reduce the cell voltage, ultimately achieving the dual effect of reducing material consumption and reducing power consumption.

[0006] 2. Technical Solution

[0007] To solve the above problems, the present invention adopts the following technical solution.

[0008] A gas diffusion electrode includes a gas diffusion layer, a catalyst layer, and an outer wrapping layer, wherein the gas diffusion layer and the catalyst layer are stacked and sandwiched inside the outer wrapping layer, and the outer wrapping layer is tin foil.

[0009] A method for preparing a gas diffusion electrode, applied to the aforementioned gas diffusion electrode, includes the following steps:

[0010] Step 1. Weigh acetylene black, add anhydrous ethanol, stir for several minutes until it is evenly mixed, and slowly and evenly add well-ground oxalic acid while stirring. Place it in an ultrasonic cleaner and ultrasonically stir to disperse it evenly. Then slowly add 60% PTFE (polytetrafluoroethylene) emulsion. The resulting mixture is ultrasonically vibrated and placed in a constant temperature water bath for heating and stirring until it solidifies into a paste.

[0011] Step 2. Roll the paste obtained in Step 1 into sheets of a certain thickness using a roller press;

[0012] Step 3. Place the prepared sheet material obtained in Step 2 into a forced-air drying oven to dry it. Then stack the sheet material and titanium mesh together and cold press them. After cold pressing, cut them into sheet materials of a certain size.

[0013] Step 4. Place the sheet-like material obtained in Step 3 into a muffle furnace for heat treatment to obtain the gas diffusion layer;

[0014] Step 5. Place a certain amount of VXC72R carbon black into a mortar, add an appropriate amount of platinum carbon, mix the VXC72R carbon black and platinum carbon evenly, and continuously add an appropriate amount of anhydrous ethanol. Then slowly add polytetrafluoroethylene (PTFE) emulsion and continuously stir and grind into a paste mixture. Then repeatedly roll the paste mixture on a roller press to roll it into a sheet. Place the sheet into a forced-air drying oven to dry it to obtain the catalyst layer.

[0015] Step 6. Place the gas diffusion layer and catalyst layer, cut to the same size, together in a piece of tin foil, place them on a cold press, set the pressure, time it, remove them, cut the tin foil, remove the excess, and obtain a complete gas diffusion electrode.

[0016] Furthermore, in step one, the stirring time is 10-30 minutes, and the constant temperature water bath temperature is 60-100℃; wherein the mass ratio of acetylene black, oxalic acid, and PTFE is 4:3:1 to 4:3:5.

[0017] Furthermore, the thickness of the sheet obtained in step two is 0.15-0.3 mm.

[0018] Furthermore, in step three, the drying temperature is set to 60-100℃, the drying time to 1-20h, the cold pressing pressure to 10-30Mpa, and the cold pressing time to 1-5min.

[0019] Furthermore, the heat treatment temperature in step four is 330°C.

[0020] Furthermore, in step five, the mass ratio of VXC72R carbon black, platinum carbon catalyst, and PTFE is 30:1:5 to 30:1:20.

[0021] An application of a gas diffusion electrode, wherein the prepared gas diffusion electrode is used as the anode in a hydrogenation reaction.

[0022] 3. Beneficial effects

[0023] Compared with the prior art, the advantages of this invention are:

[0024] (1) The gas diffusion electrode is prepared by the rolling method in this scheme. The preparation process is simple, low cost and high safety.

[0025] (2) The gas diffusion electrode prepared by this scheme through scientific proportioning can significantly improve the performance of noble metal catalysts in the hydrogenation reaction.

[0026] (3) The gas diffusion electrode prepared by this scheme through scientific proportioning has excellent gas permeability and hydrophobicity, and at the same time has high mechanical strength. Attached Figure Description

[0027] Figure 1 This is a SEM image of the gas diffusion electrode obtained in this invention;

[0028] Figure 2 This is a contact angle measurement diagram of the gas diffusion electrode obtained in this invention;

[0029] Figure 3 This is the cyclic voltammetry diagram of the gas diffusion electrode obtained in this invention;

[0030] Figure 4 This is a schematic diagram of the structure of the gas diffusion electrode obtained in this invention.

[0031] Explanation of the labels in the diagram:

[0032] 1. Outer coating layer; 2. Gas diffusion layer; 3. Catalytic layer. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0034] Example 1:

[0035] Please see Figure 1-4 A gas diffusion electrode is used as the anode in a hydrogenation reaction. The electrode includes a gas diffusion layer 2, a catalyst layer 3, and an outer wrapping layer 1. The gas diffusion layer 2 and the catalyst layer 3 are stacked and sandwiched inside the outer wrapping layer 1, which is made of tin foil.

[0036] Its preparation method includes the following steps:

[0037] (1) Weigh acetylene black, add an appropriate amount of anhydrous ethanol, stir for 20 minutes until it is evenly mixed, slowly and evenly add well ground oxalic acid while stirring, place it in an ultrasonic cleaner and ultrasonically stir to disperse it evenly, then slowly add 60% PTFE (polytetrafluoroethylene) emulsion, the resulting mixture is ultrasonically vibrated, and placed in an 85℃ constant temperature water bath for heating and stirring until it solidifies into a paste; the mass ratio of acetylene black, oxalic acid and PTFE is 4:3:1.

[0038] (2) The paste obtained in (1) is rolled into 0.2 mm sheets using a roller press;

[0039] (3) Place the prepared sheet obtained in (2) into a blower drying oven to dry, then stack the sheet and titanium mesh together and cold press, and cut it into a certain size after cold pressing; set the drying temperature to 80℃, the drying time to 12h, the cold pressing pressure to 20Mpa, and the cold pressing time to 2min.

[0040] (4) The sheet obtained in (3) is placed in a muffle furnace for heat treatment at a temperature of 330°C. After cooling to room temperature, the gas diffusion layer 2 is obtained.

[0041] (5) Place a certain amount of VXC72R carbon black into a mortar, add an appropriate amount of platinum carbon, mix the VXC72R carbon black and platinum carbon evenly, and continuously add an appropriate amount of anhydrous ethanol. Then slowly add polytetrafluoroethylene (PTFE) emulsion and continuously stir and grind it into a paste mixture. Then repeatedly roll the paste mixture on a roller press to roll it into a sheet. Place the sheet into a forced-air drying oven to dry it to obtain the catalyst layer 3. The mass ratio of VXC72R carbon black, platinum carbon catalyst and PTFE is 30:1:10.

[0042] (6) Cut the gas diffusion layer 2 and the catalyst layer 3 into the same size and sandwich them together in tin foil. Place them on a cold press, set the pressure to 20 MPa and the cold pressing time to 2 min. Cut the tin foil to remove the excess part and obtain a complete gas diffusion electrode.

[0043] Example 2:

[0044] Please see Figure 1-4 This embodiment is basically the same as Embodiment 1, except that:

[0045] Its preparation method includes the following steps:

[0046] (1) Weigh acetylene black, add an appropriate amount of anhydrous ethanol, stir for 20 minutes until it is evenly mixed, slowly and evenly add well ground oxalic acid while stirring, place it in an ultrasonic cleaner and ultrasonically stir to disperse it evenly, then slowly add 60% PTFE (polytetrafluoroethylene) emulsion, the resulting mixture is ultrasonically vibrated, and placed in an 85℃ constant temperature water bath for heating and stirring until it solidifies into a paste; the mass ratio of acetylene black, oxalic acid and PTFE is 4:3:3.

[0047] (2) The paste obtained in (1) is rolled into 0.2 mm sheets using a roller press;

[0048] (3) Place the prepared sheet obtained in (2) into a forced-air drying oven to dry, then stack the sheet and titanium mesh together and cold press, and cut it into a certain size after cold pressing; set the drying temperature to 80℃, the drying time to 12h, the cold pressing pressure to 20Mpa, and the cold pressing time to 2min.

[0049] (4) The sheet obtained in (3) is placed in a muffle furnace for heat treatment at a temperature of 330°C. After cooling to room temperature, the gas diffusion layer 2 is obtained.

[0050] (5) A certain mass of VXC72R carbon black is placed in a mortar, and an appropriate amount of platinum carbon is added. The VXC72R carbon black and platinum carbon are mixed evenly, and an appropriate amount of anhydrous ethanol is continuously added. Then, polytetrafluoroethylene (PTFE) emulsion is slowly added and continuously stirred and ground into a paste mixture. The paste mixture is then repeatedly rolled on a roller press to form a sheet. The sheet is placed in a forced-air drying oven to dry, which is the catalyst layer 3. The mass ratio of VXC72R carbon black, platinum carbon catalyst and PTFE is 30:1:10.

[0051] (6) Cut the gas diffusion layer 2 and the catalyst layer 3 into the same size and sandwich them together in tin foil. Place them on a cold press, set the pressure to 20 MPa and the cold pressing time to 2 min. Cut the electrode to remove the excess part and obtain a complete gas diffusion electrode.

[0052] Depend on Figure 1 As shown in the scanning electron microscope image, the diffusion layer has a large number of pores on its surface. These pores facilitate the rapid passage of a large amount of reactant gas to the catalyst layer 3 for reaction.

[0053] like Figure 2 As shown in the contact angle measurement diagram, the contact angle is 151°, which indicates that the diffusion layer has excellent hydrophobicity.

[0054] like Figure 3 As shown in the cyclic voltammogram, the oxidation peak current density is 0.147 A / cm². 2 .

[0055] Example 3:

[0056] Please see Figure 1-4 This embodiment is basically the same as Embodiment 1, except that:

[0057] Its preparation method includes the following steps:

[0058] (1) Weigh acetylene black, add an appropriate amount of anhydrous ethanol, stir for 20 minutes until it is evenly mixed, slowly and evenly add well ground oxalic acid while stirring, place it in an ultrasonic cleaner and ultrasonically stir to disperse it evenly, then slowly add 60% PTFE (polytetrafluoroethylene) emulsion, the resulting mixture is ultrasonically vibrated, and placed in an 85℃ constant temperature water bath for heating and stirring until it solidifies into a paste; the mass ratio of acetylene black, oxalic acid and PTFE is 4:3:5.

[0059] (2) The paste obtained in (1) is rolled into 0.2 mm sheets using a roller press;

[0060] (3) Place the prepared sheet obtained in (2) into a forced-air drying oven to dry, then stack the sheet and titanium mesh together and cold press. After cold pressing, cut it into a certain size. Set the drying temperature to 80℃, the drying time to 12h, the cold pressing pressure to 20Mpa, and the cold pressing time to 2min.

[0061] (4) The sheet obtained in (3) is placed in a muffle furnace for heat treatment at a temperature of 330°C. After cooling to room temperature, the gas diffusion layer 2 is obtained.

[0062] (5) A certain mass of VXC72R carbon black is placed in a mortar, and an appropriate amount of platinum carbon is added. The VXC72R carbon black and platinum carbon are mixed evenly, and an appropriate amount of anhydrous ethanol is continuously added. Then, polytetrafluoroethylene (PTFE) emulsion is slowly added and continuously stirred and ground into a paste mixture. The paste mixture is then repeatedly rolled on a roller press to form a sheet. The sheet is placed in a forced-air drying oven to dry, which is the catalyst layer 3. The mass ratio of VXC72R carbon black, platinum carbon catalyst and PTFE is 30:1:10.

[0063] (6) Cut the gas diffusion layer 2 and the catalyst layer 3 into the same size and sandwich them together in tin foil. Place them on a cold press, set the pressure to 20 MPa and the cold pressing time to 2 min. Cut the electrode to remove the excess part and obtain a complete gas diffusion electrode.

[0064] Example 4:

[0065] Please see Figure 1-4 This embodiment is basically the same as Embodiment 1, except that:

[0066] Its preparation method includes the following steps:

[0067] (1) Weigh acetylene black, add an appropriate amount of anhydrous ethanol, stir for 20 minutes until it is evenly mixed, slowly and evenly add well ground oxalic acid while stirring, place it in an ultrasonic cleaner and ultrasonically stir to disperse it evenly, then slowly add 60% PTFE (polytetrafluoroethylene) emulsion, the resulting mixture is ultrasonically vibrated, and placed in an 85℃ constant temperature water bath for heating and stirring until it solidifies into a paste; the mass ratio of acetylene black, oxalic acid and PTFE is 4:3:3.

[0068] (2) The paste obtained in (1) is rolled into 0.2 mm sheets using a roller press;

[0069] (3) Place the prepared sheet obtained in (2) into a forced-air drying oven to dry, then stack the sheet and titanium mesh together and cold press, and cut it into a certain size after cold pressing; set the drying temperature to 80℃, the drying time to 12h, the cold pressing pressure to 20Mpa, and the cold pressing time to 2min.

[0070] (4) The sheet obtained in (3) is placed in a muffle furnace for heat treatment at a temperature of 300°C. After cooling to room temperature, the gas diffusion layer 2 is obtained.

[0071] (5) A certain mass of VXC72R carbon black is placed in a mortar, and an appropriate amount of platinum carbon is added. The VXC72R carbon black and platinum carbon are mixed evenly, and an appropriate amount of anhydrous ethanol is continuously added. Then, polytetrafluoroethylene (PTFE) emulsion is slowly added and continuously stirred and ground into a paste mixture. The paste mixture is then repeatedly rolled on a roller press to form a sheet. The sheet is placed in a forced-air drying oven to dry, which is the catalyst layer 3. The mass ratio of VXC72R carbon black, platinum carbon catalyst and PTFE is 30:1:10.

[0072] (6) Cut the gas diffusion layer 2 and the catalyst layer 3 into the same size and sandwich them together in tin foil. Place them on a cold press, set the pressure to 20 MPa and the cold pressing time to 2 min. Cut the electrode to remove the excess part and obtain a complete gas diffusion electrode.

[0073] Example 5:

[0074] Please see Figure 1-4 This embodiment is basically the same as Embodiment 1, except that:

[0075] Its preparation method includes the following steps:

[0076] (1) Weigh acetylene black, add an appropriate amount of anhydrous ethanol, stir for 20 minutes until it is evenly mixed, slowly and evenly add well ground oxalic acid while stirring, place it in an ultrasonic cleaner and ultrasonically stir to disperse it evenly, then slowly add 60% PTFE (polytetrafluoroethylene) emulsion, the resulting mixture is ultrasonically vibrated, and placed in an 85℃ constant temperature water bath for heating and stirring until it solidifies into a paste; the mass ratio of acetylene black, oxalic acid and PTFE is 4:3:3.

[0077] (2) The paste obtained in (1) is rolled into 0.2 mm sheets using a roller press;

[0078] (3) Place the prepared sheet obtained in (2) into a forced-air drying oven to dry, then stack the sheet and titanium mesh together and cold press, and cut it into a certain size after cold pressing; set the drying temperature to 80℃, the drying time to 12h, the cold pressing pressure to 20Mpa, and the cold pressing time to 2min.

[0079] (4) The sheet obtained in (3) is placed in a muffle furnace for heat treatment at a temperature of 330°C. After cooling to room temperature, the gas diffusion layer 2 is obtained.

[0080] (5) A certain mass of VXC72R carbon black is placed in a mortar, and an appropriate amount of platinum carbon is added. The VXC72R carbon black and platinum carbon are mixed evenly, and an appropriate amount of anhydrous ethanol is continuously added. Then, polytetrafluoroethylene (PTFE) emulsion is slowly added and continuously stirred and ground into a paste mixture. The paste mixture is then repeatedly rolled on a roller press to form a sheet. The sheet is placed in a forced-air drying oven to dry, which is the catalyst layer 3. The mass ratio of VXC72R carbon black, platinum carbon catalyst and PTFE is 30:1:10.

[0081] (6) Cut the gas diffusion layer 2 and the catalyst layer 3 into the same size and sandwich them together in tin foil. Place them on a cold press, set the pressure to 20 MPa and the cold pressing time to 2 min. Cut the electrode to remove the excess part and obtain a complete gas diffusion electrode.

[0082] Example 6:

[0083] Please see Figure 1-4 This embodiment is basically the same as Embodiment 1, except that:

[0084] Its preparation method includes the following steps:

[0085] (1) Weigh acetylene black, add an appropriate amount of anhydrous ethanol, stir for 20 minutes until it is evenly mixed, slowly and evenly add well ground oxalic acid while stirring, place it in an ultrasonic cleaner and ultrasonically stir to disperse it evenly, then slowly add 60% PTFE (polytetrafluoroethylene) emulsion, the resulting mixture is ultrasonically vibrated, and placed in an 85℃ constant temperature water bath for heating and stirring until it solidifies into a paste; the mass ratio of acetylene black, oxalic acid and PTFE is 4:3:3.

[0086] (2) The paste obtained in (1) is rolled into 0.2 mm sheets using a roller press;

[0087] (3) Place the prepared sheet obtained in (2) into a forced-air drying oven to dry, then stack the sheet and titanium mesh together and cold press, and cut it into a certain size after cold pressing; set the drying temperature to 80℃, the drying time to 12h, the cold pressing pressure to 20Mpa, and the cold pressing time to 2min.

[0088] (4) The sheet obtained in (3) is placed in a muffle furnace for heat treatment at a temperature of 350°C. After cooling to room temperature, the gas diffusion layer 2 is obtained.

[0089] (5) A certain mass of VXC72R carbon black is placed in a mortar, and an appropriate amount of platinum carbon is added. The VXC72R carbon black and platinum carbon are mixed evenly, and an appropriate amount of anhydrous ethanol is continuously added. Then, polytetrafluoroethylene (PTFE) emulsion is slowly added and continuously stirred and ground into a paste mixture. The paste mixture is then repeatedly rolled on a roller press to form a sheet. The sheet is placed in a forced-air drying oven to dry, which is the catalyst layer 3. The mass ratio of VXC72R carbon black, platinum carbon catalyst and PTFE is 30:1:10.

[0090] (6) Cut the gas diffusion layer 2 and the catalyst layer 3 into the same size and sandwich them together in tin foil. Place them on a cold press, set the pressure to 20 MPa and the cold pressing time to 2 min. Cut the electrode to remove the excess part and obtain a complete gas diffusion electrode.

[0091] Experimental Example 1:

[0092] This experimental example demonstrates cyclic voltammetry testing of the gas diffusion electrodes prepared in Examples 1-3. The specific experimental methods and results are as follows:

[0093] The prepared gas diffusion electrode was used as the working electrode, the saturated calomel electrode as the reference electrode, and the platinum electrode as the counter electrode. Cyclic voltammetry was performed in 0.5 mol / L H2SO4 solution using a three-electrode system.

[0094] The gas diffusion electrodes prepared in Examples 1 and 3 exhibited slightly poorer hydroxide-oxidizing performance and lower oxidation peak current densities. Compared to Examples 1 and 3, the gas diffusion electrode prepared in Example 2 using acetylene black, oxalic acid, and PTFE in a mass ratio of 4:3:3 showed better hydroxide-oxidizing activity, with an oxidation peak current density reaching 0.147 A / cm². 2 This demonstrates that the gas diffusion electrode prepared by the optimized ratio in this invention has excellent hydroxide activity.

[0095] Experimental Example 2:

[0096] This experimental example demonstrates cyclic voltammetry testing of the gas diffusion electrodes prepared in Examples 4-6. The specific experimental methods and results are as follows:

[0097] Example 4 showed the worst hydrogenation performance, with a peak current density of 0.12 A / cm. 2 Compared to Examples 4 and 6, the gas diffusion electrode prepared in Example 5 exhibits the strongest performance, with a peak current density of 0.148 mA / cm². 2 This indicates that a suitable heat treatment temperature can effectively decompose PTFE and oxalic acid in the diffusion layer, increase the porosity of the diffusion layer, and improve the air permeability and hydrophobicity of the diffusion layer.

[0098] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A method for preparing a gas diffusion electrode, wherein, The gas diffusion electrode includes a gas diffusion layer, a catalyst layer, and an outer wrapping layer. The gas diffusion layer and the catalyst layer are stacked and sandwiched inside the outer wrapping layer, which is made of tin foil. The method is characterized by the following steps: Step 1. Weigh acetylene black, add anhydrous ethanol, stir until it is evenly mixed, and slowly and evenly add well-ground oxalic acid while stirring. Place it in an ultrasonic cleaner and ultrasonically stir to disperse it evenly. Then slowly add 60% polytetrafluoroethylene emulsion. The resulting mixture is ultrasonically vibrated and placed in a constant temperature water bath for heating and stirring until it solidifies into a paste. Step 2. Roll the paste obtained in Step 1 into sheets using a roller press; Step 3. Place the prepared sheet material obtained in Step 2 into a forced-air drying oven to dry it. Then stack the sheet material and titanium mesh together and cold press them. After cold pressing, cut them into sheet materials. Step 4. Place the sheet-like material obtained in Step 3 into a muffle furnace for heat treatment to obtain the gas diffusion layer; Step 5. Place an appropriate amount of VXC72R carbon black into a mortar, add an appropriate amount of platinum carbon, mix the VXC72R carbon black and platinum carbon evenly, and continuously add an appropriate amount of anhydrous ethanol. Then slowly add PTFE emulsion and continuously stir and grind into a paste mixture. Then repeatedly roll the paste mixture on a roller press to roll it into a sheet. Place the sheet into a forced-air drying oven to dry it to obtain the catalyst layer. Step 6. Place the gas diffusion layer and catalyst layer, cut to the same size, together in a piece of tin foil, place them on a cold press, set the pressure, time it, remove them, cut the tin foil, and remove the excess to obtain a complete gas diffusion electrode.

2. The method for preparing a gas diffusion electrode according to claim 1, characterized in that: In step one, the stirring time is 10-30 minutes, and the constant temperature water bath temperature is 60-100℃; the mass ratio of acetylene black, oxalic acid, and PTFE is 4:3:1 to 4:3:

5.

3. The method for preparing a gas diffusion electrode according to claim 1, characterized in that: The thickness of the sheet obtained in step two is 0.15-0.3 mm.

4. The method for preparing a gas diffusion electrode according to claim 1, characterized in that: In step three, the drying temperature is set to 60-100℃, the drying time to 1-20h, the cold pressing pressure to 10-30Mpa, and the cold pressing time to 1-5min.

5. The method for preparing a gas diffusion electrode according to claim 1, characterized in that: The heat treatment temperature in step four is 330℃.

6. The method for preparing a gas diffusion electrode according to claim 1, characterized in that: In step five, the mass ratio of VXC72R carbon black, platinum carbon catalyst, and PTFE is 30:1:5 to 30:1:

20.

7. An application of a gas diffusion electrode prepared by the gas diffusion electrode preparation method as described in claim 1, characterized in that: The application involves using the gas diffusion electrode as the anode for the hydrogenation reaction.

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