CN114907566B - Polyimide-metal monoatomic composite material and preparation method and application thereof - Google Patents
Polyimide-metal monoatomic composite material and preparation method and application thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1003—Preparatory processes
- C08G73/1007—Preparatory processes from tetracarboxylic acids or derivatives and diamines
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1067—Wholly aromatic polyimides, i.e. having both tetracarboxylic and diamino moieties aromatically bound
- C08G73/1071—Wholly aromatic polyimides containing oxygen in the form of ether bonds in the main chain
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/455—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
- C23C16/45523—Pulsed gas flow or change of composition over time
- C23C16/45525—Atomic layer deposition [ALD]
- C23C16/45555—Atomic layer deposition [ALD] applied in non-semiconductor technology
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- 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
- Y02E60/50—Fuel cells
Abstract
The invention provides a polyimide-metal monoatomic composite material and a preparation method and application thereof, belonging to the technical field of polymer nanometer composite materials. Firstly, coating polyamic acid on a carrier material, carrying out thermal imidization treatment on the polyamic acid to obtain a polyimide/carrier composite material, then loading metal single atoms on the polyimide/carrier composite material by an atomic layer deposition method, and finally obtaining the polyimide-metal single atom composite material loaded on the carrier material. Compared with the prior polyimide-metal nano particle composite material, the polyimide-metal monoatomic composite material prepared by the method can realize the atomic-level dispersion of metal components, so that the metal utilization rate is greatly improved. In addition, the preparation process is simple and easy to operate, and the prepared polyimide-metal monoatomic composite material has good comprehensive performance and extremely wide application potential.
Description
Technical Field
The invention belongs to the technical field of polymer nano composite materials, and particularly relates to a polyimide-metal monoatomic composite material, and a preparation method and application thereof.
Background
Polyimide is a special engineering plastic with the advantages of good molding processability, high mechanical strength, good thermal stability and the like, and is widely applied to various fields of national economy, such as catalysis, heat conduction, dielectric medium energy storage, electromagnetic wave shielding and absorbing, electrochemical energy storage and the like. The polyimide/metal nanoparticle composite material is obtained by compounding the polyimide and the metal, and the performance of the composite material can be further improved. Nevertheless, metal nanoparticles, especially noble metal nanoparticles (e.g., platinum, ruthenium, iridium, etc.), are expensive, which can add significantly to the cost of the composite. Compared with metal nano-particles, the metal monoatomic atom has unique structural characteristics and completely exposed active sites, and shows remarkable performance improvement in various application fields. At the same time, this can reduce the metal loading to reduce the cost of the composite.
Disclosure of Invention
Aiming at the problems and the defects in the prior art, the invention provides a polyimide-metal monoatomic composite material and a preparation method and application thereof.
In a first aspect of the present invention, there is provided a method for preparing a polyimide-metal monoatomic composite, the method comprising the steps of:
(i) Coating a polyamic acid solution on a carrier material, putting the carrier material into a tubular furnace or a muffle furnace, and carrying out step heating to prepare a polyimide/carrier composite material;
(ii) And loading metal monoatomic atoms on the polyimide/carrier composite material by an atomic layer deposition method to obtain the polyimide-metal monoatomic composite material loaded on the carrier material.
In one embodiment, the method for preparing the polyamic acid solution includes: dissolving diamine monomer in reaction solvent, introducing nitrogen, and adding dianhydride monomer under the condition of ice-water bath or normal-temperature stirring to prepare the polyamic acid solution.
In one embodiment, the molar ratio of diamine monomer to dianhydride monomer is from 1.0:1.0 to 1.0:1.1.
In one embodiment, the mass concentration of the polyamic acid solution is 3% to 15%, and the solvent of the polyamic acid solution includes one or more of N, N-dimethylformamide, N-dimethylacetamide, or N-methylpyrrolidone.
In one embodiment, the diamine monomer comprises one or more of p-phenylenediamine, benzidine, diaminodiphenyl ether, and diaminobenzophenone, with diaminodiphenyl ether being preferred.
In one embodiment, the dianhydride monomer includes one or more of pyromellitic anhydride, pyromellitic dianhydride, hexafluoro dianhydride, pyromellitic dianhydride, benzophenone tetracarboxylic dianhydride, and preferably pyromellitic dianhydride.
In one embodiment, the reaction solvent comprises one or more of N, N-dimethylformamide, N-dimethylacetamide and N-methylpyrrolidone, preferably N, N-dimethylformamide.
In one embodiment, the polyamic acid solution is added dropwise in the step (i) in an amount of 10 to 40. Mu.L cm -2 。
In one embodiment, the carrier material in step (i) comprises one of carbon paper, carbon aerogel, carbon felt, carbon fiber, and the like.
In one embodiment, the temperature nodes of the step heating in step (i) are sequentially: heating at 70 deg.C, 100 deg.C, 200 deg.C, 300 deg.C, 350 deg.C and 2-5 deg.C for min -1 And keeping the temperature of each temperature point for 50-60min.
In one embodiment, the heating rate of the step heating in step (i) is 5 ℃ for min -1 And keeping the temperature of each temperature node for 1h.
In one embodiment, the metal species in the step of depositing the primary layer in step (ii) includes any one of platinum, ruthenium, iridium, iron, cobalt, copper, molybdenum, and the like.
In one embodiment, in the atomic layer deposition method in step (ii), the process parameters are: the temperature of the reaction chamber is 280-350 ℃, the temperature of the source bottle is 70-85 ℃, the flux of the source line is 120-150sccm, the flux of the oxygen line is 50-80sccm, the flux of the hydrogen line is 0-120sccm, and the deposition times are 25-200 circles.
On the other hand, the invention also provides a polyimide-metal monoatomic composite material which is prepared by the method.
In one embodiment, the surface of the polyimide-metal monoatomic composite has a metal monoatomic atom.
In one embodiment, the polyimide-metal monoatomic composite has a metal monoatomic loading of not less than 0.015wt%.
In one embodiment, the polyimide-metal monoatomic composite has a metal monoatomic loading of 0.015wt% to 0.500wt%.
On the other hand, the invention also provides an application of the preparation method or an application of the polyimide-metal monatomic composite material, such as applications in the fields of catalysis, heat conduction, dielectric medium energy storage, electromagnetic wave shielding, wave absorption, electrochemical energy storage and the like.
Compared with the prior art, the invention has the beneficial effects that:
1. the preparation method of the polyimide-metal monoatomic composite material adopted by the invention is simple and easy to implement, and different composite materials with good monoatomic dispersion can be obtained by introducing different precursor metal sources.
2. Compared with the polyimide-metal nano particle composite material in the prior art, under the same catalytic effect, the polyimide-metal monoatomic composite material adopted by the invention has lower metal content and higher metal utilization rate, and can effectively reduce the material cost.
3. The polyimide material used by the polyimide-metal monoatomic composite material prepared by the invention has good chemical/electrochemical corrosion resistance, thermal stability and mechanical property, and the surface of the polyimide material contains nitrogen and oxygen containing groups and can be used for anchoring metal monoatomic atoms.
Drawings
FIG. 1 is an electron micrograph of a polyimide-metal monoatomic composite according to example 1.
FIG. 2 is an infrared spectrum of a polyimide-metal monoatomic composite according to example 1.
FIG. 3 is an X-ray photoelectron spectrum of the polyimide-metal monoatomic composite according to example 1. Wherein, the figure a is a high-resolution spectrogram of nitrogen element, and the figure b is a high-resolution spectrogram of platinum element.
FIG. 4 is an X-ray absorption spectrum of the polyimide-metal monoatomic composite material according to example 1. Wherein, the graph a is the near-edge absorption spectrum of the X-ray, and the graph b is the expansion-edge absorption spectrum of the X-ray.
FIG. 5 is a linear sweep voltammogram of a polyimide-metal monoatomic composite according to example 1.
FIG. 6 is a chronopotentiometric chart of the polyimide-metal monoatomic composite material according to example 1.
FIG. 7 is a bar graph comparing the metal loading content of the polyimide-metal monoatomic composite of example 1.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The sources of reagents used in the examples of the present invention are commercially available except where otherwise specified.
The invention provides a figure of characterization test results of embodiment 1, and other embodiments all adopt the same characterization test method, so that a person skilled in the art can directly and unambiguously determine the content of the embodiment of the invention by using the characterization test method provided by the invention.
Example 1: preparation of polyimide-platinum monoatomic composite material
(1) 4.00g (0.02 mol) of 4,4' -diaminodiphenyl ether was weighed into a three-necked flask using a balance, and 47.38g of N, N-dimethylformamide was further added. Meanwhile, a stirring motor is started to stir and keep introducing nitrogen, so that the reaction system is in a nitrogen atmosphere. After the complete dissolution, 4.36g (0.02 mol) of pyromellitic dianhydride was added in four portions. The stirring was continued in an ice-water bath or at normal temperature until a pale yellow viscous polyamic acid solution was obtained.
(2) 1.00g of the polyamic acid solution was weighed into a blue-necked bottle, 10.00g of N, N-dimethylformamide was added thereto while controlling the solid content to 10%, and the polyamic acid solution was completely diluted by stirring with a magneton. And cutting into 0.5 × 1.0cm 2 The carbon paper of the size is used as a carrier.
(3) And (3) respectively dripping 10 mu L of the mixed solution obtained in the step (2) on the front side and the back side of the carbon paper. The obtained carbon paper is heated up in a ladder manner by using a tubular furnace or a muffle furnace, and the temperature nodes are as follows in sequence: heating at 70 deg.C, 100 deg.C, 150 deg.C, 200 deg.C, 300 deg.C, 350 deg.C and 5 deg.C for 5 min -1 And preserving the heat of each temperature node for 1h to finish the preparation of the polyimide/carbon paper composite material substrate.
(4) And (3) placing the polyimide/carbon paper composite material prepared in the step (3) in a reaction chamber of atomic layer deposition equipment, adjusting a source bottle to be a platinum salt precursor, setting the temperature of the reaction chamber to be 300 ℃, the temperature of the source bottle to be 65 ℃, the flow rate of a source line to be 150sccm, the flow rate of an oxygen line to be 50sccm, the flow rate of a hydrogen line to be 0sccm, and the deposition times to be 25 circles. The final product is the polyimide-platinum single atom composite material.
Example 2: preparation of polyimide-ruthenium monoatomic composite material
(1) 4.00g (0.02 mol) of 4,4' -diaminodiphenyl ether was weighed into a three-necked flask using a balance, and 47.38g of N, N-dimethylformamide was further added. And simultaneously, turning on a stirring motor to stir and keeping the introduction of nitrogen so as to enable the reaction system to be in the nitrogen atmosphere. After the complete dissolution, 4.36g (0.02 mol) of pyromellitic dianhydride was added in four portions. The stirring was continued in an ice-water bath or at normal temperature until a pale yellow viscous polyamic acid solution was obtained.
(2) Weighing 1.00g of polyamic acid solution in a blue-mouth bottle, adding 10.00g of N, N-dimethylformamide, controlling solid content to 10%, completely diluting the polyamic acid solution by using magnetic stirring, and cutting to 0.5 × 1.0cm 2 The sized carbon paper served as the support.
(3) And (3) respectively dripping 10 mu L of the mixed solution obtained in the step (2) on the front side and the back side of the carbon paper. The obtained carbon paper is heated up in a ladder manner by using a tubular furnace or a muffle furnace, and the temperature nodes are as follows in sequence: 70 deg.C, 100 deg.C, 15 deg.CHeating at 0 deg.C, 200 deg.C, 300 deg.C, 350 deg.C and 5 deg.C for 5 min -1 And preserving the heat of each temperature node for 1h to finish the preparation of the polyimide/carbon paper composite material substrate.
(4) And (4) placing the polyimide/carbon paper composite material prepared in the step (3) in a reaction chamber of atomic layer deposition equipment, replacing a source bottle with a ruthenium salt precursor, setting the temperature of the reaction chamber to be 350 ℃, the temperature of the source bottle to be 85 ℃, the flow rate of a source line to be 120sccm, the flow rate of an oxygen line to be 80sccm, the flow rate of a hydrogen line to be 0sccm, and the deposition times to be 100 circles. The final product is the polyimide-ruthenium single atom composite material.
Example 3: preparation of polyimide-platinum monoatomic composite material
(1) 2.16g (0.02 mol) of p-phenylenediamine was weighed into a three-necked flask using a balance, and 47.38gN, N-dimethylformamide was further added. Meanwhile, a stirring motor is started to stir and keep introducing nitrogen, so that the reaction system is in a nitrogen atmosphere. After the complete dissolution, 4.36g (0.02 mol) of pyromellitic dianhydride was added in four portions. The stirring was continued in an ice-water bath or at normal temperature until a pale yellow viscous polyamic acid solution was obtained.
(2) 1.00g of the polyamic acid solution was weighed into a blue-necked bottle, 10.00g of N, N-dimethylformamide was added thereto while controlling the solid content to 10%, and the polyamic acid solution was completely diluted by stirring with a magneton. And cutting into 0.5 × 1.0cm 2 The carbon paper of the size is used as a carrier.
(3) And (3) respectively dripping 10 mu L of the mixed solution obtained in the step (2) on the front side and the back side of the carbon paper. The obtained carbon paper is subjected to step heating by using a tubular furnace or a muffle furnace, and the temperature nodes are as follows in sequence: heating at 70 deg.C, 100 deg.C, 150 deg.C, 200 deg.C, 300 deg.C, 350 deg.C and 5 deg.C for 5 min -1 And preserving the heat of each temperature node for 1h to finish the preparation of the polyimide/carbon paper composite material substrate.
(4) And (3) placing the polyimide/carbon paper composite material prepared in the step (3) in a reaction chamber of atomic layer deposition equipment, adjusting a source bottle to be a platinum salt precursor, setting the temperature of the reaction chamber to be 300 ℃, the temperature of the source bottle to be 65 ℃, the flow rate of a source line to be 150sccm, the flow rate of an oxygen line to be 50sccm, the flow rate of a hydrogen line to be 0sccm, and the deposition times to be 25 circles. The final product is the polyimide-platinum single atom composite material.
Example 4: preparation of polyimide-platinum monoatomic composite material
(1) 4.00g (0.02 mol) of 4,4' -diaminodiphenyl ether was weighed into a three-necked flask using a balance, and 47.38g of N, N-dimethylformamide was further added. Meanwhile, a stirring motor is started to stir and keep introducing nitrogen, so that the reaction system is in a nitrogen atmosphere. After the complete dissolution, 4.36g (0.02 mol) of pyromellitic dianhydride was added in four portions. The stirring was continued in an ice-water bath or at normal temperature until a pale yellow viscous polyamic acid solution was obtained.
(2) 1.00g of the polyamic acid solution was weighed into a blue-mouthed bottle, 10.00g of N, N-dimethylformamide was added to control the solid content to 10%, and the polyamic acid solution was completely diluted by stirring with a magneton. And cutting into 0.5 × 1.0cm 2 The sized carbon paper served as the support.
(3) And (3) respectively dripping 10 mu L of the mixed solution obtained in the step (2) on the front side and the back side of the carbon paper. The obtained carbon paper is subjected to step heating by using a tubular furnace or a muffle furnace, and the temperature nodes are as follows in sequence: heating at 70 deg.C, 100 deg.C, 150 deg.C, 200 deg.C, 300 deg.C, 350 deg.C and 5 deg.C for 5 min -1 And preserving the heat of each temperature node for 1h to finish the preparation of the polyimide/carbon paper composite material substrate.
(4) And (4) placing the polyimide/carbon paper composite material prepared in the step (3) in a reaction chamber of atomic layer deposition equipment, adjusting a source bottle to be a platinum salt precursor, and setting the temperature of the reaction chamber to be 350 ℃, the temperature of the source bottle to be 65 ℃, the flow rate of a source line to be 150sccm, the flow rate of an oxygen line to be 80sccm, the flow rate of a hydrogen line to be 0sccm and the deposition times to be 50 circles. The final product is the polyimide-platinum single atom composite material.
EXAMPLES Performance testing of the resulting polyimide-platinum monoatomic composite
As shown in FIG. 1, which is a spherical aberration electron micrograph of the polyimide-platinum monatomic composite material of example 1, it can be seen that platinum monatomics are dispersed on the surface of the polyimide material.
As shown in FIG. 2, which is an infrared spectrum of the polyimide-platinum monatomic composite material of example 1, a typical infrared characteristic peak of the polyimide can be seen.
As shown in fig. 3, which is an X-ray photoelectron spectrum of the polyimide-platinum monatomic composite material of example 1, it can be seen that the polyimide-platinum monatomic composite material contains nitrogen and platinum.
As shown in fig. 4, which is an X-ray absorption spectrum of the polyimide-platinum monatomic composite material of example 1, a distinct platinum-oxygen peak was observed, and no platinum-platinum peak was observed, confirming that all the metal components in the polyimide-platinum monatomic composite material prepared were monatomic.
FIG. 5 is a linear sweep voltammogram of the polyimide-platinum monatomic composite of example 1, and it can be seen from the plot that the polyimide-platinum monatomic composite was prepared at 0.5 MH 2 SO 4 The electrolyte shows excellent electrochemical hydrogen evolution performance, and the current density is 10mA cm -2 The overpotential of the lower material is as low as 22mV, and can reach 200mA cm at 0.5V overpotential -2 The current density of (1).
As shown in FIG. 6, which is a chronopotentiometric graph of the polyimide-metal monoatomic composite material according to example 1, it can be seen that the polyimide-platinum monoatomic composite material was prepared at 10mA cm -2 The electrochemical stability performance is good under the current density, and is 0.5 MH 2 SO 4 The operation is stable for 1200h under the electrolyte, and the potential decay is only within 20 mV.
Referring to fig. 7, which is a bar graph comparing the metal loading content of the polyimide-metal monoatomic composites according to examples 1 and 4, it can be seen that the metal monoatomic loading amount of the prepared polyimide-platinum monoatomic composite is 0.015wt% to 0.500wt% at the deposition turns of 5 to 40, and the loading amount is in positive correlation with the deposition turns, which indicates that the greater the number of the deposition turns, the higher the metal monoatomic loading amount is, and thus it can be considered that the metal loading content can be further increased by continuously increasing the number of the deposition turns.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (13)
1. A preparation method of a polyimide-metal monatomic composite material is characterized by comprising the following steps:
coating a polyamic acid solution on a carrier material, putting the carrier material into a tubular furnace or a muffle furnace, and carrying out step heating to prepare a polyimide/carrier composite material;
(ii) loading a metal monoatomic on the polyimide/carrier composite material by an atomic layer deposition method to obtain a polyimide-metal monoatomic composite material loaded on a carrier material, wherein the metal species in the atomic layer deposition method comprises any one of platinum and ruthenium,
in the atomic layer deposition method, the program parameters are as follows: the temperature of the reaction chamber is 280-350 ℃, the temperature of the source bottle is 70-85 ℃, the flow rate of the source line is 120-150sccm, the flow rate of the oxygen line is 50-80sccm, the flow rate of the hydrogen line is 0-120sccm, and the deposition times are 25-200 circles;
in the polyimide-metal monatomic composite material, the load of the metal monatomic is 0.015wt% to 0.500wt%.
2. The method for preparing a polyimide-metal monatomic composite material according to claim 1, wherein the method for preparing the polyamic acid solution comprises: dissolving diamine monomer in reaction solvent, introducing nitrogen, and adding dianhydride monomer under the condition of ice water bath or normal temperature stirring to prepare the polyamic acid solution.
3. The method for preparing a polyimide-metal monatomic composite material according to claim 2, wherein the molar ratio of the diamine monomer to the dianhydride monomer is 1.0 to 1.0.
4. The method of claim 2, wherein the diamine monomer comprises one or more of p-phenylenediamine, benzidine, oxydianiline, and diaminobenzophenone.
5. The method of claim 2, wherein the dianhydride monomer comprises at least one of pyromellitic dianhydride, hexafluoro dianhydride, or benzophenonetetracarboxylic dianhydride.
6. The method of claim 2, wherein the reaction solvent comprises at least one of N, N-dimethylformamide, N-dimethylacetamide, or N-methylpyrrolidone.
7. The method as claimed in claim 1, wherein the mass concentration of the polyamic acid solution in step (i) is 3% to 15%, and the solvent of the polyamic acid solution comprises one or more selected from the group consisting of N, N-dimethylformamide, N-dimethylacetamide and N-methylpyrrolidone.
8. The method of claim 1, wherein the polyamic acid solution is applied in an amount of 10 to 40 μ L/cm in step (i) -2 。
9. The method of claim 1, wherein the support material in step (i) comprises any one of carbon paper, carbon aerogel, carbon felt, and carbon fiber.
10. The method according to claim 1, wherein the temperature nodes of the stepwise temperature increase in the step (i) are sequentially: 70. heating at 100 deg.C, 200 deg.C, 300 deg.C, 350 deg.C and 2-5 deg.C for min -1 And keeping the temperature of each temperature point for 50-60min.
11. The method as claimed in claim 10, wherein the heating rate of the stepwise temperature increase in the step (i) is 5 ℃ for min -1 And keeping the temperature of each temperature node for 1h.
12. A polyimide-metal monoatomic composite material, characterized by being produced by the production method according to any one of claims 1 to 11.
13. The use of the polyimide-metal monatomic composite material of claim 12, comprising applications in the fields of catalysis, thermal conduction, dielectric energy storage, electromagnetic wave shielding and absorption, and electrochemical energy storage.
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