Preparation method of membrane electrode with surface structure for proton exchange membrane electrolyzed water based on transfer printing method

Abstract

The invention discloses a preparation method of a membrane electrode with a surface structure of proton exchange membrane electrolyzed water based on a transfer printing method, and relates to the field of proton exchange membrane electrolyzed water, the membrane electrode comprises the following components: a catalyst, a polymer, carbon black and a dispersing agent, and a proton exchange membrane structure hot press molding method is adopted, so that the membrane electrode has a regular structure, and the surface structure is uniform. The preparation method has the advantages of simple operation, effective saving of the usage amount of the catalyst, reduction of the risk of bubble blockage and improvement of the electrolysis efficiency and stability through structure optimization, and the preparation method of the membrane electrode with simple preparation and excellent performance has important significance, can improve the efficiency, stability and economy of the water electrolysis hydrogen production technology, and has wide application prospects. The development of the clean energy field is promoted.

Description

Technical Field

[0001] The present invention relates to the field of proton exchange membrane water electrolysis, in particular to a method for preparing a membrane electrode for proton exchange membrane water electrolysis, and specifically to the preparation and application of membrane electrodes in the technical field of proton exchange membrane water electrolysis. Background Art

[0002] As a water splitting hydrogen production technology, proton exchange membrane water electrolysis technology has important application value in the field of clean energy. In this technology, the membrane electrode, as a key component of the electrolysis reaction, directly affects the electrolysis efficiency and gas generation quality. The traditional membrane electrode preparation method is usually complicated and costly, and it is easy to produce bubble blockage at high current density, which limits its application range. One of the main challenges of this technology is how to design and manufacture membrane electrodes with excellent performance to promote the efficient detachment of bubbles while reducing the amount of catalyst used. This technology optimizes the structure of the membrane electrode to promote the rapid detachment of bubbles during the electrolysis process. By adjusting the pore structure of the membrane electrode, increasing vents or using electrodes of special shapes, the permeability of the gas during the electrolysis process is improved and the possibility of bubble retention is reduced. At the same time, due to the production of the membrane electrode structure, the surface area is increased, which can make the catalyst more evenly distributed on the surface of the proton exchange membrane, reduce aggregation, and make the catalyst more fully utilized. In actual operation, the amount of catalyst used in the membrane electrode can be reduced, and the efficiency can be achieved with the same or higher catalyst usage. Therefore, this technology is of great significance as a membrane electrode preparation method with simple preparation and superior performance. It can improve the efficiency, stability and economy of water electrolysis hydrogen production technology and promote the development of the clean energy field. Summary of the invention

[0003] The present invention is intended to provide a method for preparing a membrane electrode with a surface structure for proton exchange membrane water electrolysis based on a transfer method, so as to solve the problems raised in the above background technology.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A membrane electrode with a surface structure for proton exchange membrane water electrolysis based on a transfer method, wherein the components of the electrode are a catalyst, a polymer, carbon black and a dispersant, and the mass ratio of the catalyst, polymer, carbon black and dispersant is 10:40:40:10;

[0006] The method for preparing a membrane electrode with a surface structure for proton exchange membrane water electrolysis based on a transfer method comprises:

[0007] S1. Prepare catalyst materials: mix the metal catalyst or its oxide catalyst with the polymer, carbon black and dispersant in a certain proportion, stir thoroughly and perform ultrasonic vibration for 30 minutes to obtain anode catalyst slurry;

[0008] S2. Making a structure transfer film: using special white corundum particles as abrasive, sandblasting a smooth copper surface with the same size as the exchange membrane, and obtaining a sandblasted surface with controllable roughness and microstructure after cleaning, and placing the transfer film between the smooth surface and the sandblasted surface for hot pressing to obtain a transfer film with a structure on one side;

[0009] S3, distributing the catalyst slurry on the transfer film by spraying or scraping, and applying a thrust by negative pressure to evenly coat the catalyst slurry on the transfer film; and performing a drying process to evaporate and discharge the solvent;

[0010] S4, hot pressing the transfer membrane with the catalytic layer and the proton exchange membrane to transfer the catalytic layer, thereby obtaining an anode membrane electrode with a certain microstructure.

[0011] Preferably, the catalyst may be any one of a metal catalyst or an oxidation catalyst.

[0012] Preferably, in step S2, the mesh size of the special white corundum particle abrasive is 100-200-300-400 mesh.

[0013] Preferably, in step S3, the drying treatment conditions are set to a temperature of 80° C. to 100° C. and a time of 1 h to 1.5 h.

[0014] Preferably, in step 4, the hot pressing conditions are temperature: 180° C., pressure: 15 MPa, and time: 40 minutes.

[0015] Preferably, the metal catalyst may be a Pr-Ir alloy, the oxidation catalyst may be IrO2-RuO2, and the polymer may be polytetrafluoroethylene.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention adopts a method of hot pressing a proton exchange membrane structure so that the membrane electrode has a regular structure, which can effectively save the amount of catalyst used and reduce the cost required for preparation. Moreover, through structural optimization, the risk of bubble blockage is reduced and the electrolysis efficiency and stability are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a flow chart of a method for preparing a membrane electrode with a surface structure for proton exchange membrane water electrolysis based on a transfer method. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments:

[0020] like Figure 1 As shown, a membrane electrode with a surface structure for proton exchange membrane water electrolysis based on a transfer method, the components of the electrode are a catalyst, a polymer, carbon black and a dispersant, the catalyst can be any one of a metal catalyst or an oxidation catalyst, the mass ratio of the catalyst, the polymer, carbon black and the dispersant is 10:40:40:10, the metal catalyst can be a Pr-Ir alloy, the oxidation catalyst can be IrO2-RuO2, and the polymer can be polytetrafluoroethylene.

[0021] A method for preparing a membrane electrode with a surface structure for proton exchange membrane water electrolysis based on a transfer method comprises:

[0022] S1. Prepare catalyst materials: mix the metal catalyst or its oxide catalyst with the polymer, carbon black and dispersant in a certain proportion, stir thoroughly and perform ultrasonic vibration for 30 minutes to obtain anode catalyst slurry;

[0023] S2. Making a structure transfer film: using special white corundum particles as abrasives, the mesh number of the special white corundum particles is 100-200-300-400, sandblasting the smooth copper surface of the same size as the exchange membrane, and after cleaning, obtaining a sandblasted surface with controllable roughness and microstructure, placing the transfer film between the smooth surface and the sandblasted surface for hot pressing, and obtaining a transfer film with a structure on one side;

[0024] S3, distributing the catalyst slurry on the transfer film by spraying or scraping, and applying a thrust by negative pressure to evenly coat the catalyst slurry on the transfer film; and performing a drying process, wherein the drying process conditions are set at a temperature of 80° C. to 100° C. and a time of 1 h to 1.5 h, and evaporating and discharging the solvent;

[0025] S4. The transfer membrane with the catalytic layer is hot-pressed with the proton exchange membrane. The hot-pressing conditions are temperature: 180°C, pressure: 15MPa, and time: 40 minutes. The catalytic layer is transferred to obtain an anode membrane electrode with a certain microstructure.

[0026] The specific implementation process is as follows:

[0027] After the above experimental processing, the microstructure of the transfer membrane surface was observed to be uniform under a microscope; by measuring the cross section, the catalyst layer thickness was uniform, the catalyst layer was successfully transferred to the proton exchange membrane, and the microstructure was well maintained. Under the same test conditions, the membrane electrode with a surface structure showed higher water electrolysis activity and stability compared with the membrane electrode without a structure. By measuring the current density and voltage, it was found that the water electrolysis efficiency of the membrane electrode with a surface structure was improved by at least 40% at the same catalyst dosage.

[0028] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A membrane electrode with a surface structure for proton exchange membrane water electrolysis based on a transfer method, characterized in that: The components of the electrode are catalyst, polymer, carbon black and dispersant, and the mass ratio of the catalyst, polymer, carbon black and dispersant is 10: 40：40：10； The method for preparing a membrane electrode with a surface structure for proton exchange membrane water electrolysis based on a transfer method comprises: S1. Prepare catalyst materials: mix the metal catalyst or its oxide catalyst with the polymer, carbon black and dispersant in a certain proportion, stir thoroughly and perform ultrasonic vibration for 30 minutes to obtain anode catalyst slurry; S2. Making a structure transfer film: using special white corundum particles as abrasive, sandblasting a smooth copper surface with the same size as the exchange membrane, and obtaining a sandblasted surface with controllable roughness and microstructure after cleaning, and placing the transfer film between the smooth surface and the sandblasted surface for hot pressing to obtain a transfer film with a structure on one side; S3, distributing the catalyst slurry on the transfer film by spraying or scraping, and applying a thrust by negative pressure to evenly coat the catalyst slurry on the transfer film; and performing a drying process to evaporate and discharge the solvent; S4. Hot-pressing the transfer membrane with the catalytic layer and the proton exchange membrane to transfer the catalytic layer to obtain an anode membrane electrode with a certain microstructure.

2. According to claim 1, a method for preparing a membrane electrode with a surface structure for proton exchange membrane water electrolysis based on a transfer method, characterized in that: The catalyst may be any one of a metal catalyst and an oxidation catalyst.

3. The method for preparing a membrane electrode with a surface structure for proton exchange membrane water electrolysis based on a transfer method as claimed in claim 3, characterized in that: In the step S2, the mesh size of the special white corundum particle abrasive is 100-200-300-400 mesh.

4. The method for preparing a membrane electrode with a surface structure for proton exchange membrane water electrolysis based on a transfer method as claimed in claim 3, characterized in that: In step S3, the drying treatment conditions are set to a temperature of 80° C. to 100° C. and a time of 1 hour to 1.5 hours.

5. The method for preparing a membrane electrode with a surface structure for proton exchange membrane water electrolysis based on a transfer method as claimed in claim 3, characterized in that: In step 4, the hot pressing conditions are temperature: 180° C., pressure: 15 MPa, and time: 40 minutes.

6. The membrane electrode with a surface structure for proton exchange membrane water electrolysis based on transfer method according to claim 1, characterized in that: The metal catalyst may be a Pr-Ir alloy, the oxidation catalyst may be IrO2-RuO2, and the polymer may be polytetrafluoroethylene.

Images