Two-dimensional confined ionic liquid hetero-composite membrane, preparation method and application thereof

Abstract

The application provides a two-dimensional confined ionic liquid hetero-composite membrane and a preparation method and application thereof, and belongs to the technical field of renewable energy utilization.The preparation method is as follows: two-dimensional nanosheets are dispersed in a solvent to prepare a two-dimensional nanosheet dispersion liquid; the two-dimensional nanosheet dispersion liquid is filtered on a porous substrate by a suction filtration method to prepare a two-dimensional nanosheet assembly membrane; an ionic liquid solution is coated on the surface of the two-dimensional nanosheet assembly membrane, the ionic liquid is confined in the two-dimensional nanosheet assembly membrane to form a two-dimensional confined ionic liquid composite membrane, and an ionic liquid layer is formed above; a hydrophilic polymer solution is coated on the side of the porous substrate far from the ionic liquid layer to prepare a hydrophilic layer, and a two-dimensional confined ionic liquid hetero-composite membrane is obtained.The prepared hetero-composite membrane has different functional layers, the application range of the material is widened through the design of the functional layers, the hetero-composite membrane has good environmental adaptability, and has great application potential in future moisture power generation technology.

Description

Technical Field

[0001] This invention belongs to the technical field of renewable energy utilization, and particularly relates to a two-dimensional confined ionic liquid heterogeneous composite membrane, its preparation method, and its application. Background Technology

[0002] In recent years, the shortage of traditional fossil fuels and the environmental problems caused by their combustion have become increasingly serious. Therefore, the demand for new green and renewable power generation technologies is growing daily. Two-dimensional material films, with their adjustable thickness and excellent interlayer channels, can provide excellent pathways for ion-selective transport and have become a hot topic in international research in recent years.

[0003] The key to the application of two-dimensional confined ionic liquid structural materials in the field of power generation lies in the regulation of ion transport channels and environmental testing. Most current two-dimensional materials are prepared by mixing and filtration or spin coating methods. For example, patent publication number CN117258558A discloses a method for preparing an ultrathin confined ionic liquid composite membrane, which includes the following steps: dispersing two-dimensional nanosheets in a solvent to obtain a two-dimensional nanosheet dispersion; filtration of the two-dimensional nanosheet dispersion onto a porous substrate using a vacuum filtration method to obtain a two-dimensional nanosheet assembled membrane; drop-coating an ionic liquid solution onto the surface of the two-dimensional nanosheet assembled membrane, allowing it to stand, then spin-coating it on a spin coater, and drying it to obtain the ultrathin confined ionic liquid composite membrane. However, the composite membrane material prepared by this method has poor dispersibility, the uniformity of ionic liquid dispersion within the nanochannels of the composite membrane is difficult to control, the overall thickness of the composite membrane is not fixed, and specific instruments are required for operation, ultimately resulting in poor structural and performance stability of the composite membrane. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention proposes a two-dimensional confined ionic liquid heterogeneous composite membrane, its preparation method, and its application. By controlling the thickness of the two-dimensional material membrane and the amount of ionic liquid and polymer added, the composite membrane structure can be controlled, thereby achieving power generation.

[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0006] A two-dimensional confined ionic liquid heterogeneous composite membrane, comprising, from bottom to top, a hydrophilic layer, a porous substrate, a two-dimensional confined ionic liquid composite membrane, and an ionic liquid layer; the preparation method includes the following steps:

[0007] S01: A homogeneous dispersion solution is prepared by mixing two-dimensional materials with a solvent. The dispersion solution is then filtered onto a nylon substrate by vacuum filtration to obtain a two-dimensional material assembled film.

[0008] Specifically, the two-dimensional material is at least one of graphene, graphene oxide, MXene, molybdenum disulfide, or COF and MOF, and the solvent is one of water, ethanol, diethyl ether, and acetone. The concentration of the two-dimensional dispersion is 0.5-2 mg / mL. The thickness of the final two-dimensional material assembly film varies from 2 to 20 μm depending on the volume used.

[0009] S02: The ionic liquid is thoroughly mixed with ethanol or water to obtain an ionic liquid solution, which is then uniformly coated onto the two-dimensional nanosheet assembled membrane obtained by vacuum filtration. The solution is then uniformly dispersed in an oven and enters the interlayer channels to obtain a two-dimensional confined ionic liquid composite membrane.

[0010] The ionic liquid is composed of imidazole-based cations and halogen anions.

[0011] Preferably, the ionic liquid is one of OmimCl (1-octyl-3-methylimidazolium chloride), OmimBr (1-octyl-3-methylimidazolium bromide), DmimCl (decylmethylimidazolium chloride), pyridine derivatives, etc. Further, the concentration of the ionic liquid in the solvent mixture is 0.1–5 g / mL. The ionic liquid mixture is coated onto the two-dimensional nanosheet assembled membrane, where the ionic liquid spontaneously diffuses into the two-dimensional material channels. The oven temperature is set between 60 and 80°C, and the drying time is more than 8 hours, until the solvent evaporates, resulting in a two-dimensional confined ionic liquid composite membrane with an ionic liquid layer formed on top of the two-dimensional nanosheet assembled membrane.

[0012] S03: A hydrophilic polymer solution was prepared by coating a hydrophilic polymer material onto the substrate of the two-dimensional confined ionic liquid composite membrane prepared above. The membrane was then placed in a drying oven and allowed to stand to obtain a two-dimensional heterostructure composite membrane.

[0013] The porous substrate is one of nylon 6, polyvinylidene fluoride, organic microporous filter membrane, aqueous microporous filter membrane, or mixed fiber membrane, and the average pore size of the porous substrate is 100-1000 nm.

[0014] The hydrophilic polymer material is one of poly(4-styrenesulfonic acid), polyvinyl alcohol, polyether, sodium polyacrylate, polyacrylamide, or polyamide. The polymer solution is coated onto one side of the substrate of the two-dimensional confined ionic liquid structure membrane, and then dried in an oven to remove the solvent, ultimately preparing a two-dimensional heterostructure composite membrane.

[0015] The concentration of the hydrophilic polymer solution is 20-40 wt%, and the solvent is water.

[0016] During the overall preparation process, the thickness of the composite membrane can be accurately controlled by adjusting the volume of the two-dimensional dispersion of the same concentration; the content of the ionic liquid confined in the two-dimensional channel can be controlled by adjusting the volume of the ionic liquid mixture. The porous substrate, as a support layer, only provides a stable membrane structure and can be replaced by various support materials; the thickness of the polymer layer in the two-dimensional confined ionic liquid structure membrane can be adjusted by controlling the volume of the polymer. Each component of the heterogeneous composite membrane in this invention is indispensable and plays a crucial role in its application in the field of wet gas power generation.

[0017] The beneficial effects of this invention are as follows: This method involves first obtaining a two-dimensional material membrane through vacuum filtration, then confining an ionic liquid solution within the two-dimensional material channels using a blade coating method, and finally coating a polymer membrane onto one side of a substrate to obtain a two-dimensional confined ionic liquid heterocomposite membrane. The two-dimensional material membrane obtained through vacuum filtration does not require inverted vacuum treatment; the process can be completed in a single step. More importantly, the ionic liquid no longer needs prolonged vacuum degassing, and the confinement process no longer relies on high-speed centrifugal spin coating; uniform preparation can be achieved simply by blade coating. Furthermore, it exhibits good stability and remains undeformed in the environment. Crucially, the membrane thickness is controllable, and the ethanol dispersion of the ionic liquid diffuses more easily and uniformly into the interlayer channels.

[0018] The thickness of the interlayer channels in two-dimensional materials is controlled by adjusting the volume of the two-dimensional material dispersion. This invention can precisely control the interlayer spacing and thickness of the two-dimensional membrane, thereby confining different ionic liquids within it, and the amount of ionic liquid can also be precisely controlled by a coating method. Only a small amount of the prepared solution needs to be coated, allowed to stand, and dried to allow it to enter the interlayer channels via capillary action. This method is simple to prepare, requires no extremely precise equipment, and greatly solves the problem of the high equipment requirements of traditional experiments.

[0019] This invention forms a water-absorbing layer by depositing a layer of superabsorbent polymer on a substrate surface. The loaded ionic liquid provides selective ion transport and acts as an ion source, while the water-absorbing layer helps capture water vapor from humid air, thereby increasing the membrane's effective water flux. The two work synergistically. When water evaporates through the membrane, the different transport rates of anions and cations lead to selective ion transport within the nanochannels, ultimately generating different ions on both sides of the membrane. The prepared two-dimensional heterogeneous composite membrane can be widely used in fields such as wet power generation and water evaporation processes. It also generates excellent electrical energy on ordinary water surfaces, showing broad application prospects in the future large-scale integrated new energy power generation technology. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a two-dimensional confined ionic liquid heterogeneous composite membrane.

[0022] Figure 2 It is the thickness of the two-dimensional interlayer channel.

[0023] Figure 3 This is a scanning electron microscope elemental image of the cross-section of the interlayer channel of the two-dimensional confined ionic liquid structure film obtained in Example 1.

[0024] Figure 4 This is a physical image of the evaporation test conditions in Application Example 1.

[0025] Figure 5 This is a physical image of the device that floats on the water surface in Application Example 3. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1

[0028] A two-dimensional confined ionic liquid heterocomposite membrane, such as Figure 1 As shown, from bottom to top, it includes a hydrophilic layer (polymer layer), a nylon substrate, a two-dimensional confined ionic liquid composite film (graphene oxide layer), and an ionic liquid layer; the preparation method includes the following steps:

[0029] First, a graphene oxide dispersion with a concentration of 1 mg / mL was prepared, ultrasonicated for 2 hours, and stirred overnight until the solution was homogeneously and completely dispersed. Then, 10 mL of the solution was filtered under a negative pressure of 60 kPa onto a nylon membrane with a diameter of 45 mm and a pore size of 0.2–0.45 μm. Finally, after drying at 50 °C, a two-dimensional membrane with a two-dimensional channel thickness of 4.33 μm was obtained. Figure 260 μL of a 2 g / mL OmimCl (1-octyl-3-methylimidazolium chloride) ionic liquid-ethanol dispersion was added dropwise and dried at 70 °C. Then, 60 mg of 30% PSS (poly(4-styrene sulfonic acid)) was coated onto the nylon substrate. The coated membrane was then treated at 50 °C for at least 6 hours to finally prepare a two-dimensional confined ionic liquid heterocomposite membrane. The scanning electron microscopy elemental characteristics of the interlayer channel cross-section of the two-dimensional confined ionic liquid structure membrane are shown below. Figure 3 As shown, Cl represents the ionic liquid OmimCl.

[0030] Example 2

[0031] A two-dimensional confined ionic liquid heterocomposite membrane is prepared by the following steps:

[0032] First, a graphene oxide dispersion with a concentration of 1 mg / mL was prepared, ultrasonicated for 2 hours, and stirred overnight until the solution was homogeneously and completely dispersed. Then, 20 mL of the solution was filtered under a negative pressure of 60 kPa onto an aqueous filter membrane with a diameter of 45 mm and a pore size of 0.2–0.45 μm. Finally, after drying at 50 °C, a two-dimensional membrane with a two-dimensional channel thickness of 7.65 μm was obtained. Figure 2 Add 60 μL of a 2 g / mL OmimCl (1-octyl-3-methylimidazolium chloride) ionic liquid-ethanol dispersion and dry at 70 °C. Then, coat the aqueous filter membrane with 60 mg of 30% PSS (poly(4-styrene sulfonic acid)). Place the coated membrane in a drying environment at 50 °C for at least 6 hours.

[0033] Example 3

[0034] A two-dimensional confined ionic liquid heterocomposite membrane is prepared by the following steps:

[0035] First, a graphene oxide dispersion with a concentration of 1 mg / mL was prepared, sonicated for 2 hours, and stirred overnight until the solution was homogeneously and completely dispersed. 10 mL of the solution was filtered under a negative pressure of 60 kPa onto a nylon membrane with a diameter of 45 mm and a pore size of 0.2–0.45 μm. After drying at 50 °C, a two-dimensional membrane with a two-dimensional channel thickness of 4.33 μm was obtained. 60 μL of a 1 g / mL DmimCl (decylmethyl imidazolium chloride) ionic liquid-ethanol dispersion was added dropwise and dried at 70 °C. Then, 60 mg of 30% PSS (poly(4-styrene sulfonic acid)) was coated onto the nylon substrate. The coated membrane was then placed under a drying condition at 50 °C for at least 6 hours.

[0036] Example 4

[0037] A two-dimensional confined ionic liquid heterocomposite membrane is prepared by the following steps:

[0038] First, a graphene oxide dispersion with a concentration of 1 mg / mL was prepared, sonicated for 2 hours, and stirred overnight until the solution was homogeneously and completely dispersed. 10 mL of the solution was filtered under a negative pressure of 60 kPa onto a nylon membrane with a diameter of 45 mm and a pore size of 0.2–0.45 μm. After drying at 50 °C, a two-dimensional membrane with a two-dimensional channel thickness of 4.33 μm was obtained. 60 μL of a 1 g / mL OmimBr (1-octyl-3-methylimidazolium bromide) ionic liquid-ethanol dispersion was then added and dried at 70 °C. Next, 60 mg of 30% PSS (poly(4-styrene sulfonic acid)) was coated onto the nylon substrate. The coated membrane was then treated at 50 °C for at least 6 hours.

[0039] Example 5

[0040] A two-dimensional confined ionic liquid heterocomposite membrane is prepared by the following steps:

[0041] First, a 1 mg / mL MXene dispersion was prepared, sonicated for 2 hours, and stirred overnight until the solution was homogeneously and completely dispersed. 10 mL of the solution was filtered under a negative pressure of 70 kPa onto a nylon membrane with a diameter of 45 mm and a pore size of 0.2–0.45 μm. After drying at 50 °C, a two-dimensional MXene membrane with a two-dimensional channel thickness of 5.33 μm was obtained. 60 μL of a 1 g / mL OmimBr (1-octyl-3-methylimidazolium bromide) ionic liquid-ethanol dispersion was then coated and dried at 70 °C. Next, 60 mg of 30% PSS (poly(4-styrene sulfonic acid)) was coated onto the nylon substrate. The coated membrane was then treated at 50 °C for at least 6 hours.

[0042] Example 6

[0043] A two-dimensional confined ionic liquid heterocomposite membrane is prepared by the following steps:

[0044] First, a MOF dispersion with a concentration of 1 mg / mL was prepared, sonicated for 2 hours, and stirred overnight until the solution was homogeneously and completely dispersed. 10 mL of the solution was filtered under a negative pressure of 60 kPa onto a nylon membrane with a diameter of 45 mm and a pore size of 0.2–0.45 μm. After drying at 50 °C, a two-dimensional MOF membrane with a two-dimensional channel thickness of 4.93 μm was obtained. 60 μL of a 1 g / mL OmimBr (1-octyl-3-methylimidazolium bromide) ionic liquid-ethanol dispersion was added dropwise and dried at 70 °C. Then, 60 mg of 30% PSS (poly(4-styrene sulfonic acid)) was coated onto the nylon substrate. The coated membrane was then treated at 50 °C for at least 6 hours.

[0045] Example 7

[0046] A two-dimensional confined ionic liquid heterocomposite membrane is prepared by the following steps:

[0047] First, a graphene oxide dispersion with a concentration of 1 mg / mL was prepared, sonicated for 2 hours, and stirred overnight until the solution was homogeneously and completely dispersed. 10 mL of the solution was filtered under a negative pressure of 60 kPa onto a nylon membrane with a diameter of 45 mm and a pore size of 0.2–0.45 μm. After drying at 50 °C, a two-dimensional membrane with a two-dimensional channel thickness of 4.33 μm was obtained. 60 μL of a 1 g / mL O mimBr (1-octyl-3-methylimidazolium bromide) ionic liquid-ethanol dispersion was added dropwise and dried at 70 °C. Then, 100 μL of 50% PVA (polyvinyl alcohol) was coated onto the nylon substrate. The coated membrane was then treated at 50 °C for at least 6 hours.

[0048] Example 8

[0049] A two-dimensional confined ionic liquid heterocomposite membrane is prepared by the following steps:

[0050] First, a graphene oxide dispersion with a concentration of 0.5 mg / mL was prepared, ultrasonicated for 2 hours, and stirred overnight until the solution was homogeneously and completely dispersed. Six mL of the solution was then filtered under a negative pressure of 70 kPa onto polyvinylidene fluoride (PVDF) with a diameter of 45 mm and a pore size of 0.1–0.25 μm. Finally, after drying at 50 °C, a two-dimensional membrane with a two-dimensional channel thickness of 1.45 μm was obtained. Figure 2 Add 60 μL of 1 g / mL OmimCl (1-octyl-3-methylimidazolium chloride) ionic liquid-ether dispersion and dry and disperse at 70 °C. Then, coat the polyvinyl alcohol (20% by mass) at 60 mg onto the polyvinylidene fluoride substrate. Place the coated film in a drying environment at 50 °C for at least 6 hours.

[0051] Example 9

[0052] A two-dimensional confined ionic liquid heterocomposite membrane is prepared by the following steps:

[0053] First, a graphene oxide dispersion with a concentration of 2 mg / mL was prepared, ultrasonicated for 2 hours, and stirred overnight until the solution was homogeneously and completely dispersed. Then, 4 mL of the solution was filtered under a negative pressure of 60 kPa onto an aqueous filter membrane with a diameter of 45 mm and a pore size of 0.2–0.45 μm. Finally, after drying at 50 °C, a two-dimensional membrane with a two-dimensional channel thickness of 2.5 μm was obtained. Figure 2 Add 40 μL of a 5 g / mL OmimCl (1-octyl-3-methylimidazolium chloride) ionic liquid-ethanol dispersion and dry at 70 °C. Then, coat the nylon substrate with 60 mg of 20% PSS (poly(4-styrene sulfonic acid)). Place the coated film in a drying environment at 50 °C for at least 6 hours.

[0054] Example 10

[0055] A two-dimensional confined ionic liquid heterocomposite membrane is prepared by the following steps:

[0056] First, a graphene oxide dispersion with a concentration of 1 mg / mL was prepared, ultrasonicated for 2 hours, and stirred overnight until the solution was homogeneously and completely dispersed. Then, 15 mL of the solution was filtered under a negative pressure of 80 kPa onto polyvinylidene fluoride (PVDF) with a diameter of 45 mm and a pore size of 0.5–0.7 μm. Finally, after drying at 50 °C, a two-dimensional membrane with a two-dimensional channel thickness of 6.31 μm was obtained. Figure 2 Add 60 μL of a 2 g / mL DmimCl (decylmethyl imidazolium chloride) ionic liquid-ethanol dispersion and dry at 70 °C. Then, coat the nylon substrate with 60 mg of 30% PSS (poly(4-styrene sulfonic acid)). Place the coated film in a drying environment at 50 °C for at least 6 hours.

[0057] Comparative Example 1

[0058] First, a graphene oxide dispersion with a concentration of 1 mg / mL was prepared, sonicated for 2 hours, and stirred overnight until the solution was homogeneously and completely dispersed. 10 mL of the solution was filtered under a negative pressure of 60 kPa onto a nylon membrane with a diameter of 45 mm and a pore size of 0.2–0.45 μm. After drying at 50 °C, a two-dimensional membrane with a two-dimensional channel thickness of 4.33 μm was obtained. 60 μL of LOmimCl (1-octyl-3-methylimidazolium chloride) ionic liquid solution was added dropwise, allowed to stand for 4 hours, and then a spin coater was used to rotate the membrane at 4000 rpm for 60 seconds, followed by drying at 70 °C. Then, 60 mg of 30% PSS (poly(4-styrene sulfonic acid)) was coated onto the nylon substrate. The coated membrane was then placed under drying conditions at 50 °C for at least 6 hours to obtain the composite membrane.

[0059] Comparative Example 2

[0060] First, a graphene oxide dispersion with a concentration of 1 mg / mL was prepared, sonicated for 2 hours, and stirred overnight until the solution was homogeneously and completely dispersed. 10 mL of the solution was filtered under a negative pressure of 60 kPa onto a nylon membrane with a diameter of 45 mm and a pore size of 0.2–0.45 μm. After drying at 50 °C, a two-dimensional membrane with a two-dimensional channel thickness of 4.33 μm was obtained. 60 μL of a 2 g / mL OmimCl (1-octyl-3-methylimidazolium chloride) ionic liquid-ethanol dispersion was added dropwise, and the membrane was dried and dispersed at 70 °C to obtain the composite membrane.

[0061] Application Example 1

[0062] The two-dimensional confined ionic liquid heterocomposite membrane prepared in Example 1 was clamped onto a mold, as follows: Figure 4 As shown, the entire device is placed above a heated water cup, and electricity is generated by the evaporation of water, producing a voltage of approximately 0.63V.

[0063] Application Example 2

[0064] The two-dimensional confined ion heterocomposite membrane prepared in Example 3 was clamped onto a mold. The entire device was placed above a heated water cup, and a voltage of approximately 0.56V was generated by the water evaporation process.

[0065] Application Example 3

[0066] The two-dimensional confined ion heterocomposite film prepared in Example 2 was clamped onto a mold, as follows: Figure 5 As shown, placing the entire device on a floating basin of water using a foam board can generate a voltage of approximately 0.4V.

[0067] Comparative Application Example 1

[0068] The composite membrane prepared in Comparative Example 1 was clamped on a mold, and the entire device was placed above a heated water cup. The water evaporation process generates electricity, producing a voltage of approximately 0.04V.

[0069] Comparative Application Example 2

[0070] The composite membrane prepared in Comparative Example 2 was clamped on a mold, and the entire device was placed above a heated water cup. The water evaporation process was used to generate electricity, which could produce a voltage of about 0.3V.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a two-dimensional confined ionic liquid heterocomposite membrane, characterized in that, Includes the following steps: (1) Disperse two-dimensional nanosheets in a solvent to prepare a two-dimensional nanosheet dispersion; (2) The two-dimensional nanosheet dispersion was filtered onto a porous substrate by vacuum filtration to obtain a two-dimensional nanosheet assembled membrane; (3) Coating the surface of the two-dimensional nanosheet assembled film with an ionic liquid solution, drying it, and forming a two-dimensional confined ionic liquid composite film in the two-dimensional nanosheet assembled film, and forming an ionic liquid layer on top of it; (4) Coat the side of the porous substrate away from the ionic liquid layer with a hydrophilic polymer solution, dry it, and obtain a hydrophilic layer to obtain a two-dimensional confined ionic liquid heterocomposite membrane.

2. The method for preparing a two-dimensional confined ionic liquid heterocomposite membrane according to claim 1, characterized in that, The two-dimensional nanosheets are one or more of graphene, graphene oxide, MXene, and molybdenum disulfide; the diameter of the two-dimensional nanosheets is 0.5-2 μm.

3. The method for preparing a two-dimensional confined ionic liquid heterocomposite membrane according to claim 1, characterized in that, The porous substrate is one of nylon 6, polyvinylidene fluoride, organic microporous filter membrane, aqueous microporous filter membrane, or mixed fiber membrane, and the average pore size of the porous substrate is 100-1000 nm.

4. The method for preparing a two-dimensional confined ionic liquid heterocomposite membrane according to claim 1, characterized in that, The ionic liquid is composed of imidazole-based cations and halogen anions.

5. The method for preparing a two-dimensional confined ionic liquid heterocomposite membrane according to claim 4, characterized in that, The ionic liquid is 1-octyl-3-methylimidazolium chloride, decylmethylimidazolium chloride, or 1-octyl-3-methylimidazolium bromide.

6. The method for preparing a two-dimensional confined ionic liquid heterocomposite membrane according to claim 5, characterized in that, The concentration of the ionic liquid solution is 1-5 g / mL, and the solvent is ethanol or water.

7. The method for preparing a two-dimensional confined ionic liquid heterocomposite membrane according to claim 1, characterized in that, The hydrophilic polymer in the hydrophilic polymer solution is one of poly(4-styrenesulfonic acid), polyvinyl alcohol, polyether, sodium polyacrylate, polyacrylamide, or polyamide.

8. The method for preparing a two-dimensional confined ionic liquid heterocomposite membrane according to claim 1, characterized in that, The concentration of the hydrophilic polymer solution is 20-40 wt%, and the solvent is water.

9. The two-dimensional confined ionic liquid heterocomposite membrane prepared by the method according to any one of claims 1-8, characterized in that, From bottom to top, it consists of a hydrophilic layer, a porous substrate, a two-dimensional confined ionic liquid composite membrane, and an ionic liquid layer.

10. The application of the two-dimensional confined ionic liquid heterogeneous composite membrane according to claim 9 in wet gas power generation.

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