A water evaporation power generation device based on MXene / filter paper composite film and its preparation method

Abstract

The present disclosure proposes a water evaporation power generation device based on a MXene / filter paper composite film and a preparation method, belonging to the field of water evaporation power generation technology. The preparation method comprises: adding FeCl2·4H2O or FeSO4·7H2O and ascorbic acid to a mixed solution of ethylene glycol and water, stirring in a water bath to obtain an etching solution; slowly adding MAX powder to the etching solution, performing an etching reaction under magnetic stirring to obtain a product solution; centrifuging, filtering, and drying the product solution to obtain a MXene solid powder; dissolving the solid powder in deionized water to form a solution, and filtering the solution on filter paper to obtain a MXene / filter paper composite film; connecting conductive parts at the upper and lower ends of the MXene / filter paper composite film to obtain a water evaporation power generation device. The MXene stripping process is simple, does not require subsequent complex processing, and does not contain strong acid or highly toxic chemicals.

Description

Technical Field

[0001] The present disclosure belongs to the technical field of water evaporation power generation, and specifically relates to a water evaporation power generation device based on a MXene / filter paper composite film and a preparation method thereof. Background Art

[0002] Currently, water evaporation power generation is rapidly developing in new materials. For example, carbon materials and double metal hydroxides have been used to develop water evaporation power generation devices.

[0003] MXene is an emerging two-dimensional inorganic material composed of transition metal carbides, nitrides or carbonitrides. Its advantages such as rich surface functional groups, excellent conductivity and high specific surface area make it have good application prospects in the field of water evaporation power generation. For example, one of the existing technologies, Chinese patent application CN118359838A, proposes a MXene aerogel, its preparation method and hydrovoltaic power generation device, which specifically includes: preparing a solution A containing a cross-linking agent aldehyde substance and MXene, and a solution B containing chitosan and glacial acetic acid, mixing the A and B solutions in a certain proportion to prepare a pre-gel solution, and finally obtaining the MXene aerogel by directional freezing and drying. The output power of the hydrovoltaic power generation device is 0.252 μW / cm 2 In the above technical solution, the preparation process of the hydrovoltaic device requires long-term freeze-drying, which is costly. The output performance of this hydrovoltaic power generation device is poor, the output power is small, and long-term immersion may cause cellulose swelling or structural relaxation, affecting stability.

[0004] In addition, most of the currently reported methods for preparing MXene use hydrofluoric acid etching. For example, one of the existing technologies, Chinese patent CN 113060734 B, proposes an infrared low-emissivity MXene film and its preparation method. 12 to 1200 mL of 5 to 12 mol / L HCL solution, 2 to 200 mL of 15 to 30 mol / L HF solution, and 6 to 600 mL of deionized water are mixed evenly to prepare an etching solution. For example, Chinese patent application CN 119241968 A, one of the existing technologies, proposes a MXene / PVDF photothermal composite film. The photothermal conversion material MXene is obtained by etching Ti3AlC2 with HCl+LiF. Since highly toxic and corrosive HF is added to the etching solution, the above method has extremely high safety risks. The operation of the above method is extremely harsh, which will lead to serious environmental burdens such as difficult waste liquid treatment. In addition, strong acid etching (such as HF) or high-energy ultrasound may cause atomic vacancies or edge fractures on the MXene surface, reducing conductivity. These shortcomings seriously limit the widespread application and large-scale production of this method. Summary of the Invention

[0005] The present disclosure aims to solve at least one of the technical problems existing in the prior art and provide a water evaporation power generation device based on a MXene / filter paper composite film and a preparation method thereof.

[0006] In one aspect of the present disclosure, a method for preparing a water evaporation power generation device based on a MXene / filter paper composite film is provided, the method comprising:

[0007] S110, adding FeCl2·4H2O or FeSO4·7H2O and ascorbic acid to a mixed solution of ethylene glycol and water, introducing N2 or Ar, and stirring in a water bath to obtain an etching solution;

[0008] S120, slowly adding MAX powder to the etching solution, performing an etching reaction by magnetic stirring to obtain a product solution;

[0009] S130, centrifuging and drying the product solution to obtain MXene solid powder;

[0010] S140, dissolving the MXene solid powder in deionized water to form a MXene solution, and filtering the MXene solution on filter paper to obtain a MXene / filter paper composite film;

[0011] S150. Connect conductive parts to the upper and lower ends of the MXene / filter paper composite film to obtain a water evaporation power generation device.

[0012] Optionally, in the etching solution, the volume fraction of ethylene glycol is 5% to 20%, Fe 2+ The concentration is 1~2 M, the ascorbic acid concentration is 0.005~0.02 M, MAX:Fe 2+ = 1 g : 0.1 mol, and the temperature range of the etching reaction is 40-60℃.

[0013] Optionally, in step S110, N2 or Ar is introduced at a flow rate of 50 mL / min for 13-17 min, and the stirring speed is 250-350 rpm.

[0014] Optionally, the MAX powder is Ti3AlC2, Ti2AlC or V2AlC; wherein,

[0015] When the MAX powder is Ti3AlC2, the etching process is 2.5-3.5 hours;

[0016] When the MAX powder is Ti2AlC, the etching process is 1.5-2.5 hours;

[0017] When the MAX powder is V2AlC, the etching process is performed for 3-4 hours.

[0018] Optionally, in step S130, the product solution is centrifuged, including: washing the product with pure water for 20-35 minutes at a rotation speed of 3000-4000 r / min, collecting the upper solution, and finally centrifuging at 9000-11000 r / min for 20-35 minutes to collect the lower sediment to obtain MXene sediment.

[0019] Optionally, the concentration of the MXene solution is 5-20 mg / mL.

[0020] Optionally, the MXene solution is filtered on filter paper using a pore size of 0.2-0.3 μm, and the filter paper is made of PTFE.

[0021] In another aspect of the present disclosure, a water evaporation power generation device based on a MXene / filter paper composite film is provided. The water evaporation power generation device based on a MXene / filter paper composite film is prepared using the preparation method described above.

[0022] Optionally, the water evaporation power generation device includes a MXene / filter paper film, and conductive parts arranged at the upper and lower ends of the MXene / filter paper film.

[0023] This disclosure discloses a water evaporation power generation device based on a MXene / filter paper composite film and its preparation method. The preparation method comprises: adding FeCl2·4H2O or FeSO4·7H2O and ascorbic acid to a mixed solution of ethylene glycol and water, introducing N2 or Ar, and stirring in a water bath to obtain an etching solution; slowly adding MAX powder to the etching solution, performing an etching reaction under magnetic stirring to obtain a product solution; centrifuging, filtering, and drying the product solution to obtain a MXene solid powder; dissolving the MXene solid powder in deionized water to form a MXene solution, and filtering the MXene solution on filter paper to obtain a MXene / filter paper composite film; and connecting conductive portions to the upper and lower ends of the MXene / filter paper composite film to obtain a water evaporation power generation device. The etching solution of the present invention is safe and non-toxic, and the MXene exfoliation method is simple. The disclosed method for preparing MXene is a fluorine-free process with low cost and a simple process flow. The prepared water evaporation power generation device has the characteristics of high current and high voltage output and can maintain long-term stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a flowchart of a method for preparing a water evaporation power generation device based on a MXene / filter paper composite film according to a specific embodiment of the present disclosure;

[0025] Figure 2 This is an electron microscopy image of the MXene / filter paper composite film of Example 1 of the present disclosure;

[0026] Figure 3 This is a long-term output voltage test diagram of the water evaporation power generation device formed by the MXene / filter paper composite film of Example 1 of the present disclosure;

[0027] Figure 4 This is a long-term output current test diagram of the water evaporation power generation device formed by the MXene / filter paper composite film of Example 1 of the present disclosure;

[0028] Figure 5 This is a test diagram of output voltage and current of a water evaporation power generation device formed by a MXene / filter paper composite film according to Example 1 of the present disclosure, with an external load resistor;

[0029] Figure 6 This is a test diagram of the output power of the water evaporation power generation device formed by the MXene / filter paper composite film of Example 1 of the present disclosure with an external load resistance;

[0030] Figure 7 This is a long-term output voltage and current test diagram of the water evaporation power generation device formed by the MXene / filter paper composite film of Example 2 of the present disclosure;

[0031] Figure 8 This is a long-term output voltage and current test diagram of the water evaporation power generation device formed by the MXene / filter paper composite film of Example 3 of the present disclosure. DETAILED DESCRIPTION

[0032] To enable those skilled in the art to better understand the technical solutions of the present disclosure, the present disclosure is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to illustrate the present disclosure and are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present disclosure.

[0033] As shown in FIG1 , one aspect of the present disclosure provides a method for preparing a water evaporation power generation device based on a MXene / filter paper composite film, specifically comprising the following steps S110 to S150:

[0034] S110. Add FeCl2·4H2O or FeSO4·7H2O and ascorbic acid to a mixed solution of ethylene glycol and water, introduce N2 or Ar, and stir in a water bath to obtain an etching solution.

[0035] In step S110, in the etching solution, the volume fraction of ethylene glycol is 5% to 20%, Fe 2+The concentration is 1-2 M, and the ascorbic acid concentration is 0.005-0.02 M. The flow rate of N2 or Ar is 50 mL / min, the time is 13-17 min, and the stirring speed is 250-350 rpm.

[0036] This embodiment uses Fe 2+ The solution and ascorbic acid form an etching solution, which can reduce MXene structural damage, maintain etching stability, and help improve electrical conductivity. Compared with traditional HF etching methods, it avoids the use of fluoride and greatly reduces environmental and health risks.

[0037] In this embodiment, Fe 2+ Inserted into the MXene interlayer, weakening the interlayer electrostatic repulsion, while expanding the interlayer spacing through ion hydration, and also reducing the oxygen-containing groups on the MXene surface (such as -Ti-O - ), destroying the interlayer hydrogen bond network and promoting exfoliation. Ascorbic acid reduces the oxidized metals (such as Ti 4+ →Ti 3+ ), reducing the interlayer binding energy, the H released by ascorbic acid + -O that can protonate MXene - groups (forming -OH), weakening the interlayer hydrogen bonds; its molecules themselves may also be inserted into the interlayer, promoting stripping through steric hindrance. At the same time, ascorbic acid can also inhibit Fe 2+ Oxidized to Fe 3+ , maintaining the reducing environment of the system while preventing MXene from being over-oxidized.

[0038] In this embodiment, Fe 2+ The concentration and temperature achieve partial anisotropic etching, reducing lateral damage to the MXene structure.

[0039] S120, slowly adding MAX powder to the etching solution, performing an etching reaction by magnetic stirring to obtain a product solution.

[0040] In step S120, MAX:Fe 2+ =1 g: 0.1 mol, and the temperature range of the etching reaction is 40-60℃.

[0041] In step S120 , the MAX powder is Ti 3 AlC 2 , Ti 2 AlC or V 2 AlC.

[0042] In some preferred embodiments, when the MAX powder is Ti3AlC2, the etching process is performed for 2.5-3.5 hours, for example, preferably 3 hours.

[0043] In other preferred embodiments, when the MAX powder is Ti2AlC, the etching process is performed for 1.5-2.5 hours, for example, 2 hours.

[0044] In other preferred embodiments, when the MAX powder is V2AlC, the etching process is performed for 3-4 hours, for example, 3.5 hours.

[0045] During the etching process, ascorbic acid undergoes self-oxidation disproportionation reaction (or intermolecular disproportionation reaction) to produce hydrogen peroxide, Fe 2+ The Fenton reaction with hydrogen peroxide produces hydroxyl radicals, which attack the Al in the MAX phase. The Al layer is relatively active and is easily affected by strong oxidizing species. The strong oxidizing property of the hydroxyl radical enables it to destroy the chemical bonds between the Al atoms and the surrounding atoms. After the Al layer is attacked, an oxidative dissolution reaction occurs, and it reacts with the hydroxyl radicals to produce Al2O3 and water. As the Al layer is continuously oxidized and dissolved, the structure of the MAX phase is gradually destroyed, exposing the internal atomic layers of Ti and C. As the Al layer is removed (etched), the original MAX phase (for example, Ti3AlC2) gradually transforms into MXene (for example, Ti3C2T x ), where T x Represents some terminal groups on the MXene surface (such as -OH, -O, etc.), Fe 2+ Inserted into the MXene interlayer, weakening the interlayer electrostatic repulsion, while expanding the interlayer spacing through ion hydration, and also reducing the oxygen-containing groups on the MXene surface (such as -Ti-O - ), destroying the interlayer hydrogen bond network and promoting peeling. During the etching process, the Ti-C bond is more stable than the Al-phase bond, but under the comprehensive action of the reaction system, some chemical changes will occur on the surface to form these terminal groups, thereby obtaining MXene materials with specific properties. Compared with the traditional single strong oxidant etching system (such as simply using strong corrosive reagents such as HF), this method of generating etching species through a reaction chain is more gentle and controllable. 2+ Oxidized to Fe 3 + , and ascorbic acid can convert Fe 3+ Reduction back to Fe 2+ This circulation mechanism ensures that there are always enough active species (·OH) in the etching solution to maintain the continuity of the etching reaction, greatly improving the reaction efficiency and continuous etching ability of the etching solution.

[0046] S130, centrifuging and drying the product solution to obtain MXene solid powder.

[0047] In step S130, the product solution is centrifuged, including:

[0048] The product solution was centrifuged at 3000-4000 r / min for 20-35 min, the upper layer solution was collected, and the upper layer solution was centrifuged at 9000-11000 r / min for 20-35 min, and the lower layer sediment was collected to obtain MXene sediment.

[0049] In step S130, the product is dried in a vacuum oven at 60°C for 12 hours to prevent oxidation of the product.

[0050] S140, dissolving the MXene solid powder in deionized water to form a MXene solution, and filtering the MXene solution on filter paper to obtain a MXene / filter paper composite film.

[0051] In step S140, the concentration of the MXene solution is 5-20 mg / mL. The MXene solution is filtered through filter paper with a pore size of 0.2-0.3 μm and made of PTFE.

[0052] S150. Connect conductive parts to the upper and lower ends of the MXene / filter paper composite film to obtain a water evaporation power generation device.

[0053] In this embodiment, the MXene film is compounded with filter paper to form a composite film. In this way, the filter paper, as a flexible substrate, can provide physical support for the MXene film to prevent swelling caused by long-term immersion in water. Secondly, filtration results in a smaller interlamellar spacing of the MXene film, and the double electric layer between the layers has enhanced selectivity for ions. In addition, the structure of the filter paper can make the MXene film better contact with the tab, because the filter paper can spread the MXene film more evenly in the tab contact area, increasing the contact area, which is conducive to the efficient transfer of charge from the composite film to the tab, and then deriving the current to improve the power generation efficiency.

[0054] Furthermore, it should be understood that filter paper has water absorption and water retention properties. When a MXene / filter paper composite film is used for water evaporation power generation, the filter paper can absorb a certain amount of water and evenly distribute it within the composite film. On the one hand, uniform water distribution facilitates better interaction with the MXene material; on the other hand, the structure of the filter paper may affect the evaporation rate of water, and an appropriate evaporation rate may correspond to the optimal energy conversion conditions. In other words, optimizing the water distribution and evaporation rate through the composite filter paper can improve the power generation performance of the entire device. Simultaneously, the hydrophilicity and conductivity of MXene help promote rapid ion transport.

[0055] The etching process of this embodiment does not require multiple steps. 2+ / Ascorbic acid system may assist interlayer expansion during etching (Fe 2+ Inserted between layers), the peeling is promoted by steric hindrance, the preparation process does not require long-term freeze-drying, the cost is low, the operation process is simple and has certain flexibility, and is suitable for large-scale production.

[0056] In another aspect of the present disclosure, a water evaporation power generation device based on a MXene / filter paper composite film is proposed. The water evaporation power generation device based on a MXene / filter paper composite film is prepared using the preparation method described above. Please refer to the above description for the specific process, which will not be repeated here.

[0057] Specifically, the water evaporation power generation device includes a MXene / filter paper composite film and conductive parts arranged at the upper and lower ends of the MXene / filter paper composite film, wherein the conductive parts are tabs.

[0058] The water evaporation power generation device prepared by the invention has the characteristics of high current, voltage and power output and long-term stability.

[0059] It should also be understood that the present disclosure exfoliates MXene to form a few-layer or single-layer structure after exfoliation, shortening the electron transmission path and making it easier for electrons to conduct within the layer, thereby significantly improving conductivity. Simultaneously, after exfoliation, more hydrophilic functional groups are exposed on the material surface, enhancing the MXene's affinity for polar solvents such as water. This increased hydrophilicity is crucial in applications requiring contact with liquid media (such as promoting water adsorption and transport in water evaporation power generation). For example, in water evaporation power generation devices, hydrophilicity can also promote the spreading and evaporation of water on the MXene / filter paper composite film, allowing the composite film to exhibit better synergistic performance in processes such as water evaporation power generation (such as improved ion selective transport, water transport, and evaporation).

[0060] The following is a further explanation of the preparation method of the water evaporation power generation device of MXene / filter paper composite film with reference to specific examples:

[0061] Example 1

[0062] The method for preparing the water evaporation power generation device of the MXene / filter paper composite film in this example includes the following steps:

[0063] S1. Add 20 g of FeCl2·4H2O to a three-necked flask, add 80 mL of deionized water, and stir until completely dissolved at a stirring speed of 300 rpm; add 0.1 g of ascorbic acid and 10 mL of ethylene glycol, and pass N2 through the solution for 15 minutes (flow rate 50 mL / min) to eliminate dissolved oxygen to obtain an etching solution;

[0064] S2. Use a medicine spoon to slowly and uniformly add 1.0 g of Ti3AlC2 to the flask in step S1, continue to flow N2 for protection, react for 3 h, and let it stand for 30 min;

[0065] S3. Place the supernatant in a centrifuge tube and centrifuge with pure water until the pH reaches approximately 6 (at a centrifugal speed of 35,000 rpm for 20 minutes). Centrifuge again at 9,000 rpm for 20 minutes to obtain a precipitate. Finally, dry the precipitate in a vacuum oven at 60°C for 12 hours to prevent oxidation.

[0066] S4. The precipitate sample was prepared into a MXene solution with a concentration of 15 mg / mL, filtered using a vacuum filtration device (the filtration membrane was filter paper with a pore size of 0.22 μm), and dried at room temperature to obtain a MXene / filter paper composite film, such as Figure 2 As shown, the sheets are tightly packed, which is conducive to the selective passage of ions.

[0067] S5. At room temperature, tabs were installed on both ends of the MXene / filter paper composite film to obtain a water evaporation power generation device based on the MXene / filter paper composite film. The device size was 1×2 cm.

[0068] Furthermore, one end of the prepared water evaporation power generation device was placed in a beaker containing 0.3 M NaCl solution, so that the seawater partially submerged the MXene / filter paper composite film. The voltage and current between the tabs were measured using Keithley 2450. The results are as follows: Figure 3 and Figure 4 The output voltage and current density of the device reached 0.56 V and 12 μA·cm respectively. -2 The output time is as long as 30,000 s. During long-term use, the voltage and current have no obvious changes, which proves the excellent stability of the device.

[0069] Figure 5 The external load resistance of the MXene / filter paper composite thin film power generation device prepared in this embodiment varies from 10 2 Ω ~10 8 Ω output voltage and output current test diagram.

[0070] like Figure 5 As shown, the output voltage and output current of the MXene / filter paper composite thin film power generation device were tested with an external load resistance of 10 2 Ω~10 8 Ω. As the load resistance increases from 10 2 Ω increases to 10 8Ω, the output voltage increases from nearly 0V to 0.56V; at the same time, the current increases from 12 μA·cm -2 Dropped to close to 0.

[0071] Figure 6 The external load resistance of the MXene / filter paper composite thin film power generation device prepared in this embodiment varies from 10 2 Ω~10 8 Ω output power test chart.

[0072] like Figure 6 As shown, the output power of the MXene / filter paper composite thin film power generation device was tested with an external load resistance of 10 2 Ω~10 8 Ω. When the load resistance is 4×10 5 When Ω, the maximum output power density can be obtained to be 1.252 μW / cm 2 .

[0073] Example 2

[0074] The preparation method of the water evaporation power generation device of the MXene / filter paper composite film in this example is the same as that of Example 1, except that in step S2, the material selected is Ti2AlC, the etching time is set to 2 h, and one end of the obtained water evaporation power generation device is placed in a beaker containing 0.3 M NaCl solution, so that the seawater partially submerges the MXene / filter paper composite film. The current between the tabs is measured using Keithley2450. The results are as follows: Figure 7 As shown, the output voltage and current density of the device are 0.65 V and 14.2 μA·cm, respectively. -2 , the output time is up to 30000 s.

[0075] Example 3

[0076] The preparation method of the water evaporation power generation device of the MXene / filter paper composite film in this example is the same as that of Example 1, except that in step S2, the material selected is V2AlC, the etching time is set to 3.5 h, and one end of the obtained water evaporation power generation device is placed in a beaker containing 0.3 M NaCl solution, so that the seawater partially submerges the MXene / filter paper composite film. The current between the tabs is measured using Keithley2450. The results are as follows: Figure 8 As shown, the output voltage and current density of the device are 0.75 V and 13.6 μA·cm, respectively. -2 , the output time is up to 30000s.

[0077] This disclosure proposes a MXene exfoliation method and a method for preparing a water evaporation power generation device based on a MXene / filter paper composite film, which has the following beneficial effects compared to the prior art:

[0078] First, the present invention uses ascorbic acid and Fe 2+ The etching solution is formed, and the end groups of the product are mainly -O / -OH, which is more suitable for the ion transport requirements of water evaporation power generation. The etching solution is safe and non-toxic, and the MXene exfoliation process is simple, without the need for subsequent complex treatment processes;

[0079] Second, the MXene / filter paper thin film water evaporation power generation device proposed in the present invention has low cost, simple operation process and certain flexibility, making it suitable for large-scale production;

[0080] Third, the water evaporation power generation device prepared by the present invention has high current, voltage and power output and long-term stability;

[0081] Fourth, the water evaporation power generation device prepared by the present invention can be integrated through simple series and parallel connections and used to charge capacitors or other electrical appliances. This invention promotes the development of practical applications of water evaporation power generation devices.

[0082] It is understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present disclosure, and the present disclosure is not limited thereto. Those skilled in the art may make various modifications and improvements without departing from the spirit and substance of the present disclosure, and such modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A method for preparing a water evaporation power generation device based on MXene / filter paper composite film, characterized in that: The preparation method comprises: S110, adding FeCl2·4H2O or FeSO4·7H2O and ascorbic acid to a mixed solution of ethylene glycol and water, introducing N2 or Ar, and stirring in a water bath to obtain an etching solution; S120, slowly adding MAX powder to the etching solution, performing an etching reaction by magnetic stirring to obtain a product solution; S130, centrifuging and drying the product solution to obtain MXene solid powder; S140, dissolving the MXene solid powder in deionized water to form a MXene solution, and filtering the MXene solution on filter paper to obtain a MXene / filter paper composite film; S150. Connect conductive parts to the upper and lower ends of the MXene / filter paper composite film to obtain a water evaporation power generation device.

2. The preparation method according to claim 1, characterized in that In the etching solution, the volume fraction of ethylene glycol is 5% to 20%, Fe 2+ The concentration is 1~2 M, and the ascorbic acid concentration is 0.005~0.02 M.

3. The preparation method according to claim 1, characterized in that In step S110, N2 or Ar is introduced at a flow rate of 50 mL / min for 13-17 min, and the stirring speed is 250-350 rpm.

4. The preparation method according to claim 1, characterized in that MAX powder is Ti3AlC2, Ti2AlC or V2AlC; among them, When the MAX powder is Ti3AlC2, the etching process is 2.5-3.5 hours; When the MAX powder is Ti2AlC, the etching process is 1.5-2.5 hours; When the MAX powder is V2AlC, the etching process is performed for 3-4 hours.

5. The preparation method according to claim 1, characterized in that In step S120, MAX:Fe 2+ = 1 g: 0.1 mol, and the temperature range of the etching reaction is 40-60°C.

6. The preparation method according to claim 1, characterized in that In step S130, the product solution is centrifuged, including: The product solution was centrifuged at 3000-4000 r / min for 20-35 min, the upper layer solution was collected, and the upper layer solution was centrifuged at 9000-11000 r / min for 20-35 min, and the lower layer sediment was collected to obtain MXene sediment.

7. The preparation method according to claim 1, characterized in that The concentration of the MXene solution is 5-20 mg / mL.

8. The preparation method according to claim 1, characterized in that The MXene solution is filtered on filter paper with a pore size of 0.2-0.3 μm and a material of PTFE.

9. A water evaporation power generation device based on MXene / filter paper composite film, characterized in that: The water evaporation power generation device based on the MXene / filter paper composite film is prepared by the preparation method according to any one of claims 1 to 8.

10. The water evaporation power generation device according to claim 9, characterized in that: The water evaporation power generation device includes a MXene / filter paper composite film and conductive parts arranged at the upper and lower ends of the MXene / filter paper composite film.

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