Flexible moisture-driven power generation film prepared on a large scale and application thereof

Abstract

The application discloses a flexible moisture-driven power generation film capable of being prepared on a large scale and application thereof. The power generation film comprises a moisture absorption film and a desorption film. The moisture absorption film is prepared by impregnating a hydrogel with a hygroscopic ion salt. The desorption film is prepared by impregnating a hydrogel with a desorption ion salt. The power generation film is used to prepare a moisture absorption and desorption layer of a moisture power generator. The moisture absorption and desorption layer comprises a moisture absorption gel layer and a desorption gel layer, and the layer surface of the moisture absorption gel layer is attached to the layer surface of the desorption gel layer. The moisture absorption gel layer is prepared by using the moisture absorption film, and the desorption gel layer is prepared by using the desorption film. The application solves the technical problems of poor electrical performance and poor stability of the existing moisture-driven power generation material.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wetness-driven power generation. In particular, it is a flexible wetness-driven power generation film that can be mass-produced and its application. BACKGROUND

[0002] Water, as a recyclable resource, is ubiquitous and circulates. In the process of condensation, a large amount of energy is released. The recently developed wetness power generation technology converts the wetness energy into considerable electricity. This power generator directly absorbs moisture in the environment to generate electricity without additional mechanical energy input, opening up a promising green energy source. However, due to the single process of water adsorption, as the wetness process proceeds, the water gradient in the wetness power generator gradually decreases, and the electrical performance gradually decreases. Eventually, when the wetness saturation state is reached, the wetness power generator will stop providing power output, which reflects the bottleneck of its unsustainable and non-renewable power generation. There is an urgent need to explore new modes of continuous power generation from the surrounding environment.

[0003] Patent document CN109546890A discloses a wetness power generation method and device. A high polymer power generation film is prepared using a high polymer solution. The separation of positive and negative ion pairs inside the high polymer power generation film is induced by externally applying wetness stimulation in a single direction to a metal motor, releasing free-moving carriers. An electric potential difference and current are generated by the diffusion of carriers from a high concentration to a low concentration area. This method uses a high polymer power generation film to replace graphene-based materials to prepare a wetness power generator, which has the advantages of small pollution and large-scale preparation. However, in practical applications, it is found that the power generation capacity of the wetness power generator decreases rapidly with the extension of the working time, i.e., the service life of the high polymer power generation film is not long, and the stability needs to be improved. Therefore, it is necessary to develop a new wetness-driven power generation film to improve the stability of the power generation performance of the wetness power generator and its service life. SUMMARY

[0004] To this end, the technical problem to be solved by the present application is to provide a flexible wetness-driven power generation film that can be mass-produced and its application, to solve the technical problems of existing wetness-driven power generation materials that have less than ideal electrical performance and poor stability.

[0005] To solve the above technical problems, the present application provides the following technical solutions:

[0006] A flexible wetness-driven power generation film that can be mass-produced, comprising a wetness-absorbing film and a desorption film; the wetness-absorbing film is made of a hydrogel impregnated with a wetness-absorbing ionic salt; and the desorption film is made of a hydrogel impregnated with a desorption ionic salt.

[0007] The flexible humidity-driven power generation film prepared on a large scale has the following characteristics: the hygroscopic ionic salt is lithium chloride, and the desorption ionic salt is lithium carbonate; the method for the hygroscopic film impregnation treatment is as follows: the hydrogel is soaked in a lithium chloride solution with a mass concentration of 10 wt%, and after soaking for 24 h, the hydrogel is taken out and dried at 60-80 DEG C under the condition that the humidity is less than or equal to 30% for 4 h; the method for the desorption film impregnation treatment is as follows: the hydrogel is soaked in a lithium carbonate solution with a mass concentration of 10 wt%, and after soaking for 24 h, the hydrogel is taken out and naturally dried for 24 h.

[0008] The flexible humidity-driven power generation film prepared on a large scale has the following characteristics: the method for preparing the hydrogel comprises the following steps:

[0009] Step A: acrylamide (AM), N, N-methylene bisacrylamide (MBAA), 2-acrylamido-2-methyl-1-propane sulfonic acid (AMPS) and ammonium persulfate (AP) are sequentially added to deionized water, and the mixture is fully stirred and mixed to obtain a mixed system A;

[0010] Step B: nitrogen is introduced into the mixed system A to remove dissolved oxygen, and after the gas introduction is completed, a mixed system B is obtained;

[0011] Step C: the mixed system B is centrifuged to further remove oxygen, and the centrifuged mixed solution is poured into a mold;

[0012] Step D: the mold containing the mixed solution is transferred to a drying box for sealed drying to gel; then the sealed cover of the mold is opened for further drying, and after the drying is completed, the hydrogel is demolded. The sealed drying can prevent the sample from dehydrating during the gelation, and the sample obtained after the sealed drying has high viscosity and low structural strength; the drying in air can reduce the water content of the sample to increase the structural strength and reduce the viscosity for easy demolding.

[0013] In step A, the mass ratio of acrylamide, N, N-methylene bisacrylamide, 2-acrylamido-2-methyl-1-propane sulfonic acid and ammonium persulfate is (4-5):(0.001-0.002):(0.3-0.5):(0.0005-0.001); and in the mixed system A, the concentration of N, N-methylene bisacrylamide is 0.05-0.10 mol / L.

[0014] In step B, when the nitrogen is introduced, the flow rate of the nitrogen is 20-50 mL / min, and the nitrogen introduction time is 10-30 min; in step C, when the centrifugation is performed, the centrifuge speed is 3000-5000 rpm, and the centrifugation time is 10-20 min; in large-scale preparation, the centrifugation step can be omitted due to the volume limitation of the centrifuge equipment, and the nitrogen introduction time can be doubled to achieve the oxygen removal purpose.

[0015] The flexible humidity-driven power generation film prepared on a large scale, in step D: the sealing and drying temperature is 70-90℃, and the drying time is 1-1.5h; after the mold sealing cover is opened, the drying temperature is 70-90℃, and the drying time is 1-1.5h.

[0016] The flexible humidity-driven power generation film prepared on a large scale, in step A: the mass ratio of acrylamide, N,N-methylenebisacrylamide, 2-acrylamido-2-methyl-1-propanesulfonic acid and ammonium persulfate is 4.2:0.0012:0.386:0.0008; in the mixed system A, the concentration of N,N-methylenebisacrylamide is 0.075mol / L;

[0017] In step B: when nitrogen is introduced, the flow rate of nitrogen is 25mL / min, and the nitrogen introduction time is 10min;

[0018] In step C: when centrifugation is performed, the centrifuge speed is 5000rpm, and the centrifugation time is 10min;

[0019] In step D: the sealing and drying temperature is 80℃, and the drying time is 1h; after the mold sealing cover is opened, the drying temperature is 80℃, and the drying time is 1h. The hydrogel prepared by using the process conditions has a better morphology structure, and has a smaller average pore size and a higher porosity; after being immersed in lithium chloride / lithium carbonate, the AMPS with abundant ionized groups in the gel can fully endow the flexible humidity-driven power generation film with better proton dissociation capacity.

[0020] The application of the flexible humidity-driven power generation film prepared on a large scale, the humidity absorption and desorption layer of a humidity generator is prepared by using the flexible humidity-driven power generation film prepared on a large scale; the humidity absorption and desorption layer comprises a humidity absorption gel layer and a desorption gel layer, one layer surface of the humidity absorption gel layer is attached to one layer surface of the desorption gel layer; the humidity absorption gel layer is prepared by using the humidity absorption film, and the desorption gel layer is prepared by using the desorption film.

[0021] The application of the flexible humidity-driven power generation film prepared on a large scale, the humidity generator further comprises an electrode layer and a gas-permeable substrate layer; the electrode layer comprises a positive electrode layer and a negative electrode layer; the gas-permeable substrate layer comprises a first gas-permeable substrate layer and a second gas-permeable substrate layer; one layer surface of the positive electrode layer is attached to another layer surface of the humidity absorption gel layer, one layer surface of the negative electrode layer is attached to another layer surface of the desorption gel layer; another layer surface of the positive electrode layer is attached to a layer surface of the first gas-permeable substrate layer, and another layer surface of the negative electrode layer is attached to a layer surface of the second gas-permeable substrate layer.

[0022] The application of the flexible humidity-driven power generation film prepared on a large scale, wherein the positive electrode layer is a carbon electrode, a conductive carbon nanotube electrode or a graphene electrode; the negative electrode layer is a carbon electrode, a carbon-aluminum electrode or a silver electrode; the air-permeable base layer is made of a PET net or a porous PVC; the thickness of the hygroscopic gel layer is 3mm; and the thickness of the desorption gel layer is 3mm.

[0023] The technical scheme of the present application has the following beneficial technical effects:

[0024] 1. The present application uses acrylamide as the original framework of the humidity generator, and introduces a charged polymer material AMPS with many hydroxyl groups to enhance the framework and hydrophilicity of the hydrogel; the AMPS with rich ionized groups can give the humidity generator good proton dissociation ability.

[0025] 2. The hydrogel prepared by the process condition of the present application has a reasonable pore size and distribution, and after being impregnated with lithium chloride / lithium carbonate, the charged polymer material AMPS in the hydrogel can better play its ionization performance, thereby obtaining a flexible humidity-driven power generation film with excellent electrical properties.

[0026] 3. The present application uses the flexible humidity-driven power generation film impregnated with different lithium salts as the hygroscopic and desorption layer, and combines with the electrode layer and the air-permeable base layer to form a humidity generator with a "sandwich structure". The air-permeable holes of the air-permeable base layer absorb the moisture in the air to the hygroscopic layer, and at the same time, the moisture is evaporated through the desorption layer, thereby generating a continuous water circulation and a stable humidity gradient, realizing stable and long-term electrical properties. The hygroscopic and desorption process of the humidity generator is an ion flow, only one conversion step from ion flow to electrode electron flow is needed, the ion gel has high conductivity, small internal resistance and high electrical properties; and the hygroscopic and desorption process of the humidity generator is carried out at the same time, and after the net hygroscopic rate gradually decreases and tends to be stable, a stable water gradient can be maintained, realizing long-term stable electrical properties. Due to the integration of the specific hygroscopic layer and desorption layer prepared by the present application, the humidity-driven power generator can maintain stable electrical properties in a larger range of temperature and humidity.

[0027] 4. The desorption side of the humidity generator prepared by the present application is treated with lithium carbonate and can desorb at 80% humidity, and the hygroscopic side is treated with lithium chloride and can absorb moisture at 30% humidity, which can work in a range of humidity scenarios. The humidity generator prepared by the present application has a simple preparation process and is easy to prepare on a large scale.

[0028] 5、The preparation method of the present application can control the pore size and porosity of the prepared polyacrylamide hydrogel by controlling the ratio of acrylamide, N,N-methylene bisacrylamide, 2-acrylamido-2-methyl-1-propane sulfonic acid and ammonium persulfate, and by purging nitrogen to remove oxygen and controlling the gelation conditions and drying conditions, etc., so that the prepared hydrogel has an excellent three-dimensional network structure, the 2-acrylamido-2-methyl-1-propane sulfonic acid (AMPS) with many hydroxyl groups can better enhance the skeleton toughness and water storage capacity of the acrylamide hydrogel, and after lithium chloride / lithium carbonate impregnation treatment, the moisture adsorption and ion conductivity performance of the hydrogel can be significantly improved, thereby preparing a flexible moisture-driven generator film with excellent electrical performance. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 Structure diagram of the moisture generator in the embodiment of the present application;

[0030] Figure 2 Microscopic morphology diagram of the moisture generator in the embodiment of the present application;

[0031] Figure 3 Long-time test diagram of the voltage performance of the moisture generator in the embodiment of the present application;

[0032] Figure 4 Test diagram of the voltage performance of the moisture generator in the embodiment of the present application changing with temperature;

[0033] Figure 5 Test diagram of the voltage of the moisture generator in the embodiment of the present application changing with humidity;

[0034] Figure 6 Test diagram of the voltage and current of the moisture generator in the embodiment of the present application changing with load resistance value;

[0035] The reference signs in the drawings are as follows: 100-hygroscopic desorption layer; 200-electrode layer; 300-air permeable substrate layer; 101-hygroscopic gel layer; 102-desorption gel layer; 201-positive electrode layer; 202-negative electrode layer; 301-first air permeable substrate layer; 302-second air permeable substrate layer. DETAILED DESCRIPTION

[0036] 1. Preparation of flexible moisture-driven power generation film that can be prepared on a large scale

[0037] The flexible moisture-driven power generation film that can be prepared on a large scale in the present embodiment includes a hygroscopic film and a desorption film; the hygroscopic film is prepared by impregnating a hydrogel with a hygroscopic ionic salt; and the desorption film is prepared by impregnating a hydrogel with a desorption ionic salt.

[0038] 1.1 Preparation of hydrogel

[0039] The preparation method of the hydrogel used in this embodiment is as follows: first, 3 g of acrylamide (AM), 0.00185 g of N,N-methylenebisacrylamide (MBAA), 0.8 g of 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS), and 0.00185 g of ammonium persulfate (AP) are taken. They are placed in 16 mL of deionized water, and after being stirred thoroughly, nitrogen gas is introduced at a flow rate of 25 mL / min for 10 min; after the introduction of nitrogen gas is completed, the mixture is centrifuged in a centrifuge at a speed of 5000 rpm for 10 min. After being centrifuged thoroughly, the solution is poured into a mold, and the mold is sealed and dried in a drying oven at 80°C for 1 h to perform gelation. After gelation, the mold is sealed and opened to allow the gel to contact air, and the gel is dried at 80°C for another 1 h, thereby obtaining the hydrogel.

[0040] The reagents used in the preparation of the hydrogel described above are as follows: acrylamide (AM, Beijing Bailingwei Company); N,N-methylenebisacrylamide (MBAA, Aladdin Reagent Company); deionized water (DW, Beijing Chemical Reagent Company); ammonium persulfate (AP, Aladdin Reagent Company); 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS, Aladdin Reagent Company); lithium chloride (LiCl, Aladdin Reagent Company); lithium carbonate (LiCO3, Aladdin Reagent Company). Instruments: constant-temperature drying oven (PINE Instrument Company), centrifuge (CHI760D, Chenhua Instrument Company); ultrasonic cleaner (120 W, Beijing Ultrasonic Instrument Company), Keithley 2400 digital source meter (Keithley Instrument Company).

[0041] The hydrogel prepared by the method of this embodiment has a smaller average pore size, a higher porosity, and a pore structure that is not too regular, which is conducive to the impregnation and adsorption of lithium chloride or lithium carbonate. After adsorption, the hygroscopic gel film and the desorption gel film have a high conductivity, a small internal resistance, and high electrical performance, and have ideal hygroscopic / desorption performance, which can play a good proton dissociation capacity in a humidity generator.

[0042] The hygroscopic ionic salt used in this embodiment is lithium chloride, and the desorption ionic salt is lithium carbonate. The method for impregnation treatment of the hygroscopic film is as follows: the prepared hydrogel is soaked in a lithium chloride solution with a mass concentration of 10 wt%, and after soaking for 24 h, it is taken out and dried at 80°C under a humidity control of less than or equal to 30% for 4 h. The method for impregnation treatment of the desorption film is as follows: the prepared hydrogel is soaked in a lithium carbonate solution with a mass concentration of 10 wt%, and after soaking for 24 h, it is taken out and naturally air-dried for 24 h.

[0043] 2. Application of flexible humidity-driven power generation film that can be prepared on a large scale

[0044] The power generation film prepared by the method of "1. Preparation of flexible moisture-driven power generation film capable of large-scale production" is used to prepare the moisture absorption and desorption layer of the moisture power generator, and the moisture absorption film and the desorption film are used as the moisture absorption gel layer and the desorption gel layer of the power generator, respectively. Specifically, the structure of the moisture power generator of the embodiment is as shown in Figure 1 and Figure 2 .

[0045] 2.1 Structure of the moisture power generator

[0046] As can be seen from Figure 1 , the moisture power generator comprises a moisture absorption and desorption layer 100, an electrode layer 200 and a gas-permeable substrate layer 300, which form a sandwich structure. The moisture absorption and desorption layer 100 comprises a moisture absorption gel layer 101 and a desorption gel layer 102, the electrode layer 200 comprises a positive electrode layer 201 and a negative electrode layer 202, and the gas-permeable substrate layer 300 comprises a first gas-permeable substrate layer 301 and a second gas-permeable substrate layer 302; one layer of the moisture absorption gel layer 101 and one layer of the desorption gel layer 102 are attached to each other; one layer of the positive electrode layer 201 is attached to the other layer of the moisture absorption gel layer 101, and one layer of the negative electrode layer 202 is attached to the other layer of the desorption gel layer 102; the other layer of the positive electrode layer 201 is attached to the layer of the first gas-permeable substrate layer 301, and the other layer of the negative electrode layer 202 is attached to the layer of the second gas-permeable substrate layer 302.

[0047] The materials of the positive electrode layer 201 and the negative electrode layer 202 are both conventional materials in the art, which can be selected by those skilled in the art according to actual needs. For example, the positive electrode layer 201 comprises a carbon electrode, a conductive carbon nanotube electrode or a graphene electrode, and the negative electrode layer 202 comprises a carbon electrode, a carbon-aluminum electrode or a silver electrode. The gas-permeable substrate layer 300 can be any material as long as it is not conductive, gas-permeable and stable in properties, and those skilled in the art can select the material of the gas-permeable substrate layer 300 according to actual needs. For example, the gas-permeable substrate layer 300 comprises a PET net substrate or a porous PVC substrate.

[0048] 2.2 Analysis of the power generation mechanism of the moisture power generator

[0049] The power generator is composed of a moisture absorption layer and an evaporation layer (i.e. a desorption layer). Each layer is decorated with different ionic salt additives. Due to the continuous water flow through the negative charge channel by directional evaporation, the moisture power generator can spontaneously generate a continuous voltage.

[0050] The humidity generator is a self-sustained generator driven by the combination of water adsorption and desorption. The main body of the humidity generator is composed of a hygroscopic gel layer 101 and a desorption gel layer 102, both of which are prepared by impregnating different ionic salts into the water gel as the matrix. The hygroscopic layer introduces lithium chloride into the water gel by simple impregnation method. The desorption layer is to impregnate lithium carbonate into another piece of water gel, thereby forming an asymmetric distribution. Two carbon electrodes are connected to the outer surface of the two layers respectively. The assembled device can absorb moisture in the air through its hygroscopic layer, while evaporating water through the evaporation layer, thereby generating a continuous water flow cycle and a stable humidity gradient, realizing stable and long-term electrical performance, such as Figure 3 as shown.

[0051] Thanks to the integration of the hygroscopic layer and the desorption layer, the humidity generator can maintain stable electrical performance in a wide range of temperature and humidity, such as Figure 4 and Figure 5 As shown. Due to the high ionic conductivity of the water gel used in this embodiment, it has the advantage of small internal resistance. Specifically, in the humidity generator prepared in this embodiment, AMPS ionization provides carriers, sulfonic acid groups make the water gel have a three-dimensional network structure, improve the mechanical properties and proton dissociation. Lithium ions enable protons to be transported quickly according to Hofmeister effect. Lithium chloride and lithium carbonate provide atmospheric water adsorption and desorption capacity for the hygroscopic layer and the desorption layer respectively. That is, the excellent biocompatibility, good hydrophilicity and certain toughness of acrylamide as the original skeleton of the humidity generator can ensure the adsorption and storage of water molecules. The water gel prepared by the method of this embodiment can make the 2-acrylamido-2-methyl-1-propane sulfonic acid (AMPS) with many hydroxyl groups introduced better enhance the toughness of the acrylamide hydrogel skeleton and water storage capacity. At the same time, the AMPS with strong ionization group (-SO3H) contained in the water gel can endow ICH (humidity generator) with excellent proton dissociation capacity; that is, the humidity-driven generator plays a role in dissociating movable H + when responding to water molecule interaction. In addition, LiCl as a strong hygroscopic agent and easily ionized positive salt is doped into the above-mentioned double network water gel (PAM / AMPS) by impregnation method, which can further improve the humidity adsorption and ion conductivity performance.

[0052] 2.3 Performance test of humidity power generation

[0053] The hygroscopic and desorption layer, the electrode layer and the breathable substrate layer are arranged according to Figure 1The structure is fixed and assembled by insulating tape, and is placed in a special container with constant temperature and humidity, and is connected with an external circuit test system through a wire. The container is maintained at a constant humidity by different hygroscopic or saturated solutions such as calcium chloride, and the humidity change in the container is monitored in real time by a humidity detector. The electrical performance (voltage, current signal) test uses a Keithley 2400 digital source meter.

[0054] The power generation performance test results of the wet gas generator in this embodiment are shown in Figures 3 to 6 From Figure 3 , it can be seen that the wet gas driven generator in this embodiment can continuously and stably generate electricity for up to 20 days, overcoming the poor durability of wet gas power generation; from Figure 4 , it can be seen that the wet gas driven generator in this embodiment has relatively stable power generation performance under various temperature scenarios and can adapt to working conditions in a large temperature range; from Figure 5 , it can be seen that the wet gas driven generator in this embodiment can stably generate electricity in a wide range of humidity and has a large range of humidity adaptability; from Figure 6 , it can be seen that the internal resistance of the wet gas driven generator in this embodiment is 0.24 megaohm, which has a lower internal resistance in the same field, ensuring the efficiency of the electrical output.

[0055] Obviously, the above embodiments are only examples for clarity and do not limit the embodiments. Based on the above description, those skilled in the art can make other different forms of changes or modifications. Here, it is not necessary and impossible to exhaust all the embodiments. The obvious changes or modifications derived therefrom are still within the protection scope of the claims of the present patent application.

Claims

1. A flexible moisture-driven power generation film that can be produced on a large scale, characterized by, The moisture-absorbing film and the desorption film; the moisture-absorbing film is prepared by impregnating a hydrogel with a moisture-absorbing ionic salt; and the desorption film is prepared by impregnating a hydrogel with a desorption ionic salt; The preparation method of the hydrogel comprises the following steps: Step A: acrylamide, N,N-methylene bisacrylamide, 2-acrylamido-2-methyl-1-propane sulfonic acid and ammonium persulfate are sequentially added into deionized water, and mixed by fully stirring to obtain a mixed system A; the mass ratio of acrylamide, N,N-methylene bisacrylamide, 2-acrylamido-2-methyl-1-propane sulfonic acid and ammonium persulfate is (4-5) :(0.001-0.002) :(0.3-0.5) :(0.0005-0.001); and the concentration of N,N-methylene bisacrylamide in the mixed system A is 0.05-0.10 mol / L; Step B: nitrogen is introduced into the mixed system A, and after the introduction of nitrogen is completed, a mixed system B is obtained; Step C: the mixed system B is centrifuged, and the centrifuged mixed solution is poured into a mold; Step D: the mold containing the mixed solution is transferred to a drying box for sealed drying to obtain a gel; then the sealing cover of the mold is opened for continuous drying, and the mold is demolded after drying to obtain a hydrogel.

2. The flexible moisture-driven power generation film that can be mass-produced according to claim 1, wherein, The moisture-absorbing ionic salt is lithium chloride, and the desorption ionic salt is lithium carbonate; the impregnation treatment method of the moisture-absorbing film is that the hydrogel is soaked in a lithium chloride solution with a mass concentration of 10 wt%, and after soaking for 24 h, the hydrogel is taken out and dried at 60-80 DEG C under the condition that the humidity is less than or equal to 30% for 4 h; and the impregnation treatment method of the desorption film is that the hydrogel is soaked in a lithium carbonate solution with a mass concentration of 10 wt%, and after soaking for 24 h, the hydrogel is taken out and naturally air-dried for 24 h.

3. The flexible moisture-driven power generation film that can be mass-produced according to claim 1, wherein, In step B, when the nitrogen is introduced, the flow rate of the nitrogen is 20-50 mL / min, and the nitrogen introduction time is 10-30 min; in step C, when the centrifugation is performed, the rotation speed of the centrifuge is 3000-5000 rpm, and the centrifugation time is 10-20 min.

4. The flexible moisture-driven power generation film according to claim 1, wherein, In step D, the sealed drying temperature is 70-90 DEG C, and the drying time is 1-1.5 h; after the sealing cover of the mold is opened, the drying temperature is 70-90 DEG C, and the drying time is 1-1.5 h.

5. The flexible moisture-driven power generation film according to claim 1, wherein, In step A, the mass ratio of acrylamide, N,N-methylene bisacrylamide, 2-acrylamido-2-methyl-1-propane sulfonic acid and ammonium persulfate is 4.2:0.0012:0.386:0.0008; and the concentration of N,N-methylene bisacrylamide in the mixed system A is 0.075 mol / L; In step B, when the nitrogen is introduced, the flow rate of the nitrogen is 25 mL / min, and the nitrogen introduction time is 10 min; In step C, when the centrifugation is performed, the rotation speed of the centrifuge is 5000 rpm, and the centrifugation time is 10 min; In step D, the sealed drying temperature is 80 DEG C, and the drying time is 1 h; after the sealing cover of the mold is opened, the drying temperature is 80 DEG C, and the drying time is 1 h.

6. Use of a flexible, moisture-driven power-generating film that can be produced on a large scale, characterized in that The moisture-absorbing and desorbing layer (100) of the moisture generator is prepared by using the flexible and large-scale prepared moisture-driven power generation film according to any one of claims 1-5; the moisture-absorbing and desorbing layer (100) comprises a moisture-absorbing gel layer (101) and a desorbing gel layer (102), one layer of the moisture-absorbing gel layer (101) and one layer of the desorbing gel layer (102) are adhered to each other; the moisture-absorbing gel layer (101) is prepared by using the moisture-absorbing film, and the desorbing gel layer (102) is prepared by using the desorbing film.

7. The use of the flexible moisture-driven power generation film according to claim 6, wherein, The moisture generator further comprises an electrode layer (200) and a gas-permeable substrate layer (300); the electrode layer (200) comprises a positive electrode layer (201) and a negative electrode layer (202); the gas-permeable substrate layer (300) comprises a first gas-permeable substrate layer (301) and a second gas-permeable substrate layer (302); one layer of the positive electrode layer (201) is adhered to another layer of the moisture-absorbing gel layer (101), and one layer of the negative electrode layer (202) is adhered to another layer of the desorbing gel layer (102); another layer of the positive electrode layer (201) is adhered to a layer of the first gas-permeable substrate layer (301), and another layer of the negative electrode layer (202) is adhered to a layer of the second gas-permeable substrate layer (302).

8. The use of the flexible moisture-driven power generation film according to claim 7, wherein, The positive electrode layer (201) is a carbon electrode; the negative electrode layer (202) is a carbon electrode, a carbon-aluminum electrode or a silver electrode; the gas-permeable substrate layer (300) is made of PET net or porous PVC; the thickness of the moisture-absorbing gel layer (101) is 3 mm; and the thickness of the desorbing gel layer (102) is 3 mm.

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