CN116949483A - Cathode catalytic layer structure for high-efficiency AEM water electrolysis hydrogen production and construction method - Google Patents
Cathode catalytic layer structure for high-efficiency AEM water electrolysis hydrogen production and construction method Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 230000003197 catalytic effect Effects 0.000 title claims abstract description 28
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 20
- 239000001257 hydrogen Substances 0.000 title claims abstract description 20
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 238000005868 electrolysis reaction Methods 0.000 title abstract description 15
- 238000004519 manufacturing process Methods 0.000 title abstract description 9
- 238000010276 construction Methods 0.000 title abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 36
- 229910052799 carbon Inorganic materials 0.000 claims description 34
- 230000002209 hydrophobic effect Effects 0.000 claims description 25
- 239000000463 material Substances 0.000 claims description 24
- 239000003054 catalyst Substances 0.000 claims description 22
- 239000000758 substrate Substances 0.000 claims description 17
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 16
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 12
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 12
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 12
- 239000002002 slurry Substances 0.000 claims description 12
- 238000005507 spraying Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 10
- 239000004020 conductor Substances 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 8
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 8
- 229920000554 ionomer Polymers 0.000 claims description 7
- 238000001291 vacuum drying Methods 0.000 claims description 7
- 239000000725 suspension Substances 0.000 claims description 5
- 229920001046 Nanocellulose Polymers 0.000 claims description 4
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 4
- 239000006229 carbon black Substances 0.000 claims description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 4
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 4
- 150000001450 anions Chemical class 0.000 claims description 3
- 238000001354 calcination Methods 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 2
- 239000006230 acetylene black Substances 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000004917 carbon fiber Substances 0.000 claims description 2
- 239000004744 fabric Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 abstract description 14
- 239000003011 anion exchange membrane Substances 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 239000007789 gas Substances 0.000 description 11
- 239000003792 electrolyte Substances 0.000 description 9
- 238000009792 diffusion process Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 239000006185 dispersion Substances 0.000 description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000011031 large-scale manufacturing process Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000013112 stability test Methods 0.000 description 2
- 238000001132 ultrasonic dispersion Methods 0.000 description 2
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000009210 therapy by ultrasound Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
- C25B11/04—Electrodes; Manufacture thereof not otherwise provided for characterised by the material
- C25B11/051—Electrodes formed of electrocatalysts on a substrate or carrier
- C25B11/055—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the substrate or carrier material
- C25B11/057—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the substrate or carrier material consisting of a single element or compound
- C25B11/065—Carbon
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/02—Hydrogen or oxygen
- C25B1/04—Hydrogen or oxygen by electrolysis of water
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
- C25B11/04—Electrodes; Manufacture thereof not otherwise provided for characterised by the material
- C25B11/051—Electrodes formed of electrocatalysts on a substrate or carrier
- C25B11/052—Electrodes comprising one or more electrocatalytic coatings on a substrate
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
- C25B11/04—Electrodes; Manufacture thereof not otherwise provided for characterised by the material
- C25B11/051—Electrodes formed of electrocatalysts on a substrate or carrier
- C25B11/054—Electrodes comprising electrocatalysts supported on a carrier
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
- C25B9/17—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof
- C25B9/19—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
Abstract
The invention belongs to the technical field of anion exchange membrane water electrolysis hydrogen production, and particularly provides a cathode catalytic layer structure and a construction method of high-efficiency AEM water electrolysis hydrogen production. The invention solves the problem of insufficient water content of the cathode in the single-side liquid inlet mode of the anode, and simultaneously promotes the transmission of hydrogen generated by the cathode, and obtains hydrogen with higher purity at the cathode. Compared with an unmodified cathode structure, the cathode structure has lower cell pressure at the same current density, and shows more excellent AEM water electrolysis hydrogen production capability and stable performance.
Description
Technical Field
The invention belongs to the technical field of hydrogen production by water electrolysis through an anion exchange membrane, and particularly relates to a cathode catalytic layer structure for high-efficiency AEM water electrolysis hydrogen production and a construction method thereof.
Background
Due to the use of fossil fuels, the concentration of carbon dioxide in the atmosphere is continuously rising. The technology for producing hydrogen by electrolyzing water has the advantages of high electrolysis efficiency, high hydrogen purity, no pollution in reaction and the like, wherein the anode of alkaline membrane electrolysis water (AEM) can adopt a non-noble metal catalyst, so that the cost is saved, the problem that the anode catalyst in proton exchange membrane electrolysis water (PEM) is dissolved in electrolyte is avoided, and the technology has potential market application prospect.
At present, three common electrolyte feeding modes of the AEM electrolytic tank are as follows: the liquid is led through the two sides of the cathode and the anode, and the liquid is led through the single side of the cathode and the single side of the anode. The most ideal operation condition is that only the single-side liquid passing of the anode is carried out, under the working condition, the cathode does not have electrolyte, and hydrogen with higher purity can be obtained at the outlet of the cathode, so that the cost is saved for subsequent hydrogen drying and separation, and the industrial application is expected to be realized. However, since the cathode does not have electrolyte, the reactant (water) required for hydrogen production by cathode electrolysis of water only comes from water in the anode, which passes through the anion exchange membrane to reach the cathode, and the water content reaching the cathode is difficult to meet the requirement under the actual working condition (high current condition) due to the limited water permeability of the membrane. In addition, insufficient cathode water content can affect the conductivity of the anion exchange membrane, and the transport of hydroxyl groups by the ionomer in the catalytic layer. Therefore, the design of the novel cathode catalytic layer structure to improve the local water content of the cathode under the condition of only carrying out single-side liquid inlet of the anode is important to improve the performance and stability of AEM electrolyzed water.
Currently, some methods are proposed as to how to increase the cathode interfacial water content. The prior art is mainly directed to the type and content of ionomers (j. Electrochem. Soc.2020,167,164514; j. Electrochem. Soc.2021,168,24503; int.j. Hydrogen Energy 2017,42,10752), the type of membrane (int.j. Electrochem. Sci.2018,13,11347) and the concentration of the anolyte (j. Electrochem.2021,168, 84512). Although the above strategies can improve the concentration of cathode water content and increase the performance of AEM electrolyzed water, they are affected by the type of anion exchange membrane, the type of ionomer and the electrolyte, and the improvement method is not universal.
Disclosure of Invention
The invention aims to solve the technical problems that the cathode has insufficient water content under the condition that only an anode is connected with electrolyte in AEM electrolytic water, and the stability and the efficiency of the whole AEM device are affected.
The invention is influenced by the sponge water absorption effect in life, and provides a strategy for improving the local water content of a cathode and promoting the rapid transmission of gas generated by the cathode. The method has obvious effect, is simple to prepare, and is suitable for large-scale production and application.
In order to achieve the above problems, the present invention is achieved by the following technical scheme:
the first aspect of the invention provides a cathode catalytic layer structure for producing hydrogen by electrolyzing water by high-efficiency AEM, which comprises a substrate layer, a hydrophilic microporous conductive layer and a cathode catalyst slurry layer which are sequentially arranged, wherein the substrate layer is a hydrophobic layer, the hydrophilic microporous conductive layer comprises a first hydrophilic material and a conductive material, the cathode catalyst slurry layer comprises a second hydrophilic material and a catalyst, and the first hydrophilic material and the second hydrophilic material are the same or different.
Further, the substrate layer is hydrophobic carbon paper or hydrophobic carbon cloth, preferably hydrophobic carbon paper.
Further, the conductive material is one or more than two of carbon black vulcan xc-72, acetylene black and carbon fiber, preferably carbon black vulcan xc-72.
Further, the first hydrophilic material is one or more of nanocellulose, carboxymethyl cellulose and sodium carboxymethyl cellulose, preferably carboxymethyl cellulose.
Further, the second hydrophilic material is one or more of nanocellulose, carboxymethyl cellulose and sodium carboxymethyl cellulose, preferably carboxymethyl cellulose.
Further, the catalyst is 10 to 20 weight percent of Pt/C, niMo alloy and MoS 2 Preferably, the catalyst is 20wt% Pt/C.
The second aspect of the present invention provides a method for constructing the cathode catalytic layer structure, comprising the following steps:
spraying hydrophilic microporous conducting layer on the basal layer with spraying load of 0.5-2 mg/cm 2 Then drying in a vacuum drying oven at 50-80 ℃ overnight;
spraying a cathode catalyst slurry layer on the hydrophilic microporous conductive layer, wherein the spraying load is 0.5-1.5 mg/cm 2 And then drying in a vacuum drying oven at 50-80 ℃ overnight.
Further, the preparation method of the substrate layer comprises the following steps: and (3) treating the hydrophilic carbon paper with PTFE suspension with the mass fraction of 5-30% for 2-10 minutes, and then calcining in a muffle furnace at 320-350 ℃ for 0.5-2 hours to obtain the hydrophobic carbon paper.
The PTFE suspension is commercial PTFE emulsion with a solid content of 60% and is diluted to the required mass fraction with an aqueous solution.
The hydrophilic carbon paper is one or more of commercial hydrophilic carbon paper with the model of TGP-H-060, ceTech GDS090S, toray TGP-H-030 and AvCarb MGL370, preferably TGP-H-06.
Further, the preparation method of the hydrophilic microporous conductive layer comprises the following steps: mixing a first hydrophilic material and a conductive material, wherein the first hydrophilic material accounts for 1-8% of the mass of the conductive material.
Further, the preparation method of the cathode catalyst slurry layer comprises the following steps: mixing the catalyst, the polymer anion ionomer and the second hydrophilic material according to the mass ratio of 1:0.05-0.5:0.01-0.1.
The polymer anion ionomer is one or more of Nafion-D521, fumion FAA-3 and Sustainion XA-9, preferably Fumion FAA-3.
The invention has the advantages and beneficial effects that:
1. the invention provides a construction method of a cathode catalytic layer for high-efficiency AEM water electrolysis hydrogen production, which can solve the problem of insufficient cathode water content under the condition of single-side liquid inlet of an AEM device anode and promote gas transmission generated by a cathode by adopting hydrophobic carbon paper as a substrate layer and simultaneously spraying a hydrophilic microporous conductive layer and a catalytic layer containing hydrophilic materials on the surface of the substrate layer. By constructing this unique structure, example 1 was performed at a current density of-1A/cm 2 The cell pressure of the electrolysis cell was-1.93V, while the constant current stability test showed that example 1 had a lower voltage and better stability.
2. The traditional AEM performance promotion is concentrated on developing a novel cathode catalyst, and the invention focuses on constructing a unique cathode catalytic layer structure, improving the interface reactant of the cathode catalytic layer and promoting the hydrogen transmission of a product at the same time, so that the water electrolysis performance and stability of an AEM device are improved.
3. The cathode catalytic layer construction method provided by the invention adopts a simple spraying process, is simple to prepare, and can realize large-scale production and application.
Drawings
FIG. 1 is a schematic diagram showing the comparison of the cathode catalytic layer structure of the high-efficiency AEM electrolyzed water provided by the invention with the conventional cathode catalytic layer structure;
FIG. 2 is a schematic diagram of a preparation flow of a cathode catalytic layer structure for producing hydrogen by water electrolysis by using the high-efficiency AEM provided by the invention;
FIG. 3 is an XRD pattern of hydrophilic carbon paper and hydrophobic carbon paper;
FIG. 4 is an SEM image of hydrophobic carbon paper;
FIG. 5 is an SEM image of a substrate layer coated with a hydrophilic microporous conductive layer;
FIG. 6 is an SEM cross-sectional view of hydrophobic carbon paper;
FIG. 7 is an SEM cross-sectional view of a substrate layer sprayed with a hydrophilic microporous conductive layer;
FIG. 8 is an electrochemical plot of the materials of example 1 versus the comparative example material;
fig. 9 is a graph of the stability test of the example 1 material versus the comparative example material.
Detailed Description
The invention is further illustrated by the following examples, which are intended to be illustrative only and not limiting in any way.
Example 1:
cutting commercial hydrophilic carbon paper into 2cm x 2cm, soaking the commercial hydrophilic carbon paper in a 30% PTFE suspension for 5min, and then drying the commercial hydrophilic carbon paper in a vacuum drying oven at 80 ℃ overnight; and calcining the carbon paper processed by the dried PTFE suspension in a muffle furnace at a temperature rising rate of 5 ℃/min, heating to 320 ℃, preserving heat at 320 ℃ for 1.5 hours, and cooling to room temperature to obtain the hydrophobic carbon paper. XRD characterization is carried out on the hydrophobic carbon paper prepared in the first step, as shown in figure 3, and the result shows that a signal of PTFE appears in the XRD spectrum of the hydrophobic carbon paper after the hydrophobic treatment, which proves that the PTFE is successfully introduced into the hydrophilic carbon paper, thereby enhancing the hydrophobic capacity of the carbon paper.
Step two, weighing 10mg of carbon black vulcan xc-72 and 0.5mg of carboxymethyl cellulose, performing ultrasonic dispersion in 2mL of ethanol for two hours, measuring 1mL of dispersion liquid by using a liquid-transferring gun, transferring the dispersion liquid into a spray gun, spraying the dispersion liquid on hydrophobic carbon paper, and drying the hydrophobic carbon paper in a vacuum drying oven at 60 ℃ overnight to obtain the substrate with the hydrophilic microporous conductive layer on the surface.
Step three, 10mg of 20% Pt/C,1.0mg of carboxymethyl cellulose are weighed, subjected to ultrasonic dispersion in 2mL of ethanol for 1 hour, and then 100 mu L of 5wt% Fumion FAA-3 ionomer is added. And continuing to carry out ultrasonic treatment for 1 hour, then measuring 1mL of dispersion liquid by using a liquid-transferring gun, transferring the dispersion liquid into the spray gun, spraying the dispersion liquid on a substrate layer with a hydrophilic micropore conductive layer on the surface, and drying the substrate layer in a vacuum drying oven at 60 ℃ overnight to obtain the final cathode catalytic layer structure.
As can be seen from SEM figures 4 and 5 of the hydrophobic carbon paper prepared in the first step and the hydrophilic microporous conductive layer prepared in the second step, after the hydrophilic microporous conductive layer is constructed on the surface of the hydrophobic carbon paper, the carbon fiber structure on the surface is covered with conductive carbon and carboxymethyl cellulose. Also, SEM figures 6 and 7 show the carbon fiber structure with a hydrophilic microporous conductive layer attached.
AEM device assembly: the layered hydroxide NiFeLDH is adopted as an anode, the anion exchange membrane is fumasep FAA-3-50, the anolyte is 1MKOH, the volume of the anolyte is 30mL, and the flow rate of the electrolyte is 15mL/min.
Linear polarization performance of AEM devices was tested at a potential range of-0.9 to-2.5V using a Prins-ton P4000 electrochemical workstation, with layered hydroxide NiFe LDH at the anode and a constant current (-1A/cm) applied at the cathode 2 ) The trend of the cathode potential over time was observed, and the result showed that example 1 had lower voltage and better stability, as shown in fig. 8 and 9.
Fig. 1 is a schematic diagram comparing the structure of the high-efficiency AEM electrolyzed water cathode catalytic layer provided by the invention with the structure of the traditional cathode catalytic layer, and it can be seen from fig. 1 that when hydrophilic carbon paper is used as a substrate, the electrolyte can penetrate through the catalytic layer to infiltrate the gas diffusion layer, and after the gas diffusion layer infiltrates, the gas diffusion layer is flooded. Due to H 2 The diffusion coefficient in aqueous solution is much smaller than that in air, resulting in a blocked gas transport. Electrolyte enters the gas diffusion layer and also causes the cathode interface water content to decrease. In contrast, when the hydrophobic carbon paper is used as a substrate, the hydrophobic carbon paper can prevent the electrode liquid from entering the gas diffusion layer, so that the gas diffusion layer maintains a relatively dry condition, and gas transmission is promoted; meanwhile, hydrophilic materials are simultaneously introduced into the hydrophilic substrate and the catalytic layer, so that the water content of a cathode interface can be improved, and the problem of insufficient water content under the condition of high current is solved. Therefore, the invention not only solves the problem of insufficient cathode water content under the condition of single side liquid inlet of the anode, but also can promote the gas transmission generated by the cathode.
Comparative example 1:
the difference from example 1 is that the second step is omitted and the cathode catalyst slurry layer is directly sprayed on the surface of the hydrophobic carbon paper, and the proportion of the cathode catalyst slurry layer is the same as that of example 1. The test results are shown in fig. 8 and 9.
Comparative example 2:
the difference from example 1 is that step two is omitted and, in addition, the cathode catalyst slurry layer does not contain carboxymethyl cellulose. The test results are shown in fig. 8 and 9.
Comparative example 3:
the difference from example 1 is that the hydrophilic microporous conductive layer of step two does not contain carboxymethyl cellulose. The test results are shown in fig. 8 and 9.
Comparative example 4:
the difference from example 1 is that the step three cathode catalyst slurry layer does not contain carboxymethyl cellulose. The test results are shown in fig. 8 and 9.
In summary, the above embodiments are merely illustrative of the principles and embodiments, and are not intended to limit the invention, but any modifications, equivalents, improvements or the like can be made without departing from the principles of the invention.
Claims (10)
1. The cathode catalytic layer structure for producing hydrogen by electrolyzing water by using high-efficiency AEM is characterized by comprising a substrate layer, a hydrophilic microporous conductive layer and a cathode catalyst slurry layer which are sequentially arranged, wherein the substrate layer is a hydrophobic layer, the hydrophilic microporous conductive layer comprises a first hydrophilic material and a conductive material, the cathode catalyst slurry layer comprises a second hydrophilic material and a catalyst, and the first hydrophilic material and the second hydrophilic material are the same or different.
2. The cathode catalytic layer structure according to claim 1, wherein the substrate layer is a hydrophobic carbon paper or a hydrophobic carbon cloth.
3. The cathode catalytic layer structure according to claim 1, wherein the conductive material is one or more of carbon black vulcanxc-72, acetylene black, and carbon fiber.
4. The cathode catalytic layer structure according to claim 1, wherein the first hydrophilic material is one or more of nanocellulose, carboxymethylcellulose, sodium carboxymethylcellulose.
5. The cathode catalytic layer structure according to claim 1, wherein the second hydrophilic material is one or more of nanocellulose, carboxymethyl cellulose, sodium carboxymethyl cellulose.
6. The cathode catalytic layer structure according to claim 1, wherein the catalyst is 10-20 wt% pt/C, niMo alloy, moS 2 One or two or more of them.
7. The method of constructing a cathode catalytic layer structure according to any one of claims 1 to 6, comprising the steps of:
spraying hydrophilic microporous conducting layer on the basal layer with spraying load of 0.5-2 mg/cm 2 Then drying in a vacuum drying oven at 50-80 ℃ overnight;
spraying a cathode catalyst slurry layer on the hydrophilic microporous conductive layer, wherein the spraying load is 0.5-1.5 mg/cm 2 And then drying in a vacuum drying oven at 50-80 ℃ overnight.
8. The method of claim 7, wherein the base layer is prepared by: and (3) treating the hydrophilic carbon paper with PTFE suspension with the mass fraction of 5-30% for 2-10 minutes, and then calcining in a muffle furnace at 320-350 ℃ for 0.5-2 hours to obtain the hydrophobic carbon paper.
9. The method of claim 7, wherein the hydrophilic microporous conductive layer is prepared by a method comprising: mixing a first hydrophilic material and a conductive material, wherein the first hydrophilic material accounts for 1-8% of the mass of the conductive material.
10. The method of claim 7, wherein the cathode catalyst slurry layer is prepared by: mixing the catalyst, the polymer anion ionomer and the second hydrophilic material according to the mass ratio of 1:0.05-0.5:0.01-0.1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310884324.5A CN116949483A (en) | 2023-07-19 | 2023-07-19 | Cathode catalytic layer structure for high-efficiency AEM water electrolysis hydrogen production and construction method |
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| CN202310884324.5A CN116949483A (en) | 2023-07-19 | 2023-07-19 | Cathode catalytic layer structure for high-efficiency AEM water electrolysis hydrogen production and construction method |
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