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CN-122013217-A - AEM electrolytic tank assembly process and membrane electrode preparation method

CN122013217ACN 122013217 ACN122013217 ACN 122013217ACN-122013217-A

Abstract

The invention relates to the technical field of hydrogen energy equipment manufacturing, and discloses an AEM (AEM) electrolytic tank assembling process and a membrane electrode preparation method, wherein the preparation method comprises the following steps of S1, preparing slurry, namely respectively preparing anode slurry and cathode slurry; S2, treating the diffusion layer, namely soaking and cleaning the diffusion layer, and S3, transferring slurry, namely uniformly spraying cathode and anode slurry on the diffusion layer treated in the S2 by using a spraying machine to obtain a catalytic layer/diffusion layer composite. S4, membrane pretreatment, namely soaking and cleaning the anion exchange membrane, S5, assembling an AEM groove, and S6, testing the membrane electrode prepared in S5. The catalyst utilization rate in the membrane electrode preparation process is improved by 40%, and the noble metal consumption is reduced by 30%. The qualification rate of the membrane electrode is increased from 75% to 95%, and in addition, the overall performance of the membrane electrode reaches a current density of 1A/cm < 2 > at a voltage of 1.622V (60 ℃ C./1M KOH), and the 200 h attenuation rate is stabilized to be less than 3%.

Inventors

  • ZHANG WEI
  • ZHOU TINGTING
  • WANG MINGZHEN

Assignees

  • 中科焓能(安徽)新能源科技有限公司

Dates

Publication Date
20260512
Application Date
20260303

Claims (10)

  1. 1. The preparation method of the membrane electrode is characterized by comprising the following steps of: s1, preparing slurry, namely respectively preparing anode slurry and cathode slurry; s2, diffusion layer treatment, namely soaking and cleaning the diffusion layer; s3, slurry transfer, namely uniformly spraying cathode and anode slurries on the diffusion layers treated in the step S2 by using a spraying machine to obtain a catalytic layer/diffusion layer composite; s4, membrane pretreatment, namely soaking and cleaning the anion exchange membrane; s5, AEM groove assembly is carried out; S6, testing the membrane electrode prepared in the S5.
  2. 2. The method of claim 1, wherein the step of preparing the anode slurry in S1 comprises: Preparing an anode catalyst NiFe LDH, water and isopropanol into a solution with the concentration of 10mg/mL, placing the solution into a ball mill for ball milling, then adding 15 wt% of an additive, and performing ultrasonic treatment under the condition of 28 kHz for 30 min; wherein, the water is isopropanol=1:3-1:5, the rotating speed of the ball mill is 300 rpm, and the ball milling time is 4 h.
  3. 3. The method of preparing a membrane electrode according to claim 2, wherein the additives in S1 include Nafion D2020, nafion D2021 and Nafion D2022.
  4. 4. The method of preparing a membrane electrode according to claim 2, wherein the operation of preparing the cathode slurry in S1 comprises: cathode catalyst, namely preparing 50% -Pt/C catalyst, water and isopropanol into a solution with the concentration of 10 mg/mL; Wherein, water: isopropanol=1:5.
  5. 5. The method of claim 1, wherein S2 comprises immersing the anion exchange membrane in a solution of 0.5-1M for 1h, and ultrasonic washing with water and alcohol 4 times, 15 min each time.
  6. 6. The method for preparing a membrane electrode according to claim 5, wherein the anion exchange membrane is nickel felt, titanium felt or foam nickel, and the solution used for soaking is oxalic acid or HCl.
  7. 7. The method of claim 1, wherein the anode loading of the catalytic layer/diffusion layer composite in S3 is 0.5 mg/cm 2 and the cathode Pt loading is 0.5 mg/cm 2 .
  8. 8. The method for preparing a membrane electrode according to claim 1, wherein the step S4 is specifically performed by placing an anion exchange membrane in a range of 0.5-1M KOH, circularly soaking the membrane in water at 60 ℃ for 24 h times, and soaking the membrane in deionized water for 5 times.
  9. 9. The method according to claim 1, wherein the test result of S6 is that the current density of 1. 1A/cm 2 can be achieved by the voltage of 1.622V under the conditions of 1M KOH,60 ℃ and the flow rate of 30 mL/min.
  10. 10. An AEM electrolytic tank assembly process applied to the membrane electrode preparation method according to any one of claims 1 to 9, which is characterized by comprising the step of assembling the catalytic layer/diffusion layer complex obtained in the step S3 and the anion exchange membrane treated in the step S4 into a membrane electrode sandwich structure.

Description

AEM electrolytic tank assembly process and membrane electrode preparation method Technical Field The invention relates to the technical field of hydrogen energy equipment manufacturing, in particular to an AEM electrolytic tank assembly process and a membrane electrode preparation method. Background AEM electrolysis cells have become a research hotspot for green hydrogen production due to the advantages of using non-noble metal catalysts, low alkali concentration, and the like. However, its performance and lifetime are limited: 1. catalyst agglomeration, the traditional magnetic stirring preparation slurry is unevenly dispersed, resulting in reduced electrode active sites (literature: J.Power Sources 2023,580,233541); 2. The interface of the diffusion layer/the catalytic layer fails, the wettability of the hydrophobic substrate is poor, and the adhesive force of the slurry is poor; 3. Membrane conductivity decay-anion exchange membrane OH-, conductivity drops rapidly with run time (commercial FAA-3 membrane lost 40% of conductivity after 2000 h); The prior art has the defects that for example, single ultrasonic dispersion slurry is adopted in the prior patent CN114481265A, the catalyst particle size is more than 500 nm, for example, the diffusion layer acid activation step is omitted in the prior patent US2022156321A1, the interfacial resistance is as high as 0.3 omega cm < 2 >, for example, the membrane pretreatment in the prior patent WO2024015886A1 has no temperature control, and the quaternary ammonium group is degraded. It is therefore desirable to design an AEM cell assembly process and membrane electrode preparation method. Disclosure of Invention The invention aims to provide an AEM electrolytic tank assembling process and a membrane electrode preparation method, so as to solve the problems in the prior art. The aim of the invention can be achieved by the following technical scheme: a method for preparing a membrane electrode, the method comprising the steps of: s1, preparing slurry, namely respectively preparing anode slurry and cathode slurry; s2, diffusion layer treatment, namely soaking and cleaning the diffusion layer; and S3, transferring slurry, namely uniformly spraying cathode and anode slurry on the diffusion layers treated in the step S2 by using a spraying machine to obtain a catalytic layer/diffusion layer composite. S4, membrane pretreatment, namely soaking and cleaning the anion exchange membrane; s5, AEM groove assembly is carried out; S6, testing the membrane electrode prepared in the S5. Further, the anode slurry preparation operation in S1 includes: Preparing an anode catalyst NiFe LDH, water and isopropanol into a solution with the concentration of 10mg/mL, placing the solution into a ball mill for ball milling, then adding 15 wt% of an additive, and performing ultrasonic treatment under the condition of 28 kHz for 30 min; wherein, the water is isopropanol=1:3-1:5, the rotating speed of the ball mill is 300 rpm, and the ball milling time is 4 h. Further, the additives in the S1 include Nafion D2020 and Nafion D2021. Further, the operation of preparing the cathode slurry in S1 includes: cathode catalyst, namely preparing 50% -Pt/C catalyst, water and isopropanol into a solution with the concentration of 10 mg/mL; Wherein, water: isopropanol=1:5. Further, the step S2 comprises the steps of soaking the anion exchange membrane in 0.5-1M solution for 1 h, and then ultrasonically cleaning the membrane with water and alcohol for 4 times, wherein each time is 15 min. Further, the anion exchange membrane is selected from nickel felt, titanium felt and foam nickel, and the solution used for soaking is selected from oxalic acid and HCl. Further, the anode loading of the catalytic layer/diffusion layer composite in S3 was 0.5 mg/cm 2 and the cathode Pt loading was 0.5 mg/cm 2. Further, the specific operation of the S4 is that the anion exchange membrane is placed in 0.5-1M KOH, is circularly soaked for 24 h at the temperature of 60 ℃ and is soaked for 5 times by deionized water. Further, the test result of S6 shows that the voltage of 1.622V can reach the current density of 1A/cm 2 under the conditions of 1M KOH,60 ℃ and the flow rate of 30 mL/min. The AEM electrolytic tank assembly process is applied to the membrane electrode preparation method, and specifically comprises the step of assembling the catalytic layer/diffusion layer complex obtained in the step S3 and the anion exchange membrane processed in the step S4 into a membrane electrode sandwich structure. The invention has the beneficial effects that: The catalyst utilization rate in the membrane electrode preparation process is improved by 40%, and the noble metal consumption is reduced by 30%. The qualification rate of the membrane electrode is increased from 75% to 95%, and in addition, the overall performance of the membrane electrode reaches a current density of 1A/cm < 2 > at a voltage of 1.622V (60 ℃ C./1M KOH), and the 200 h