Paper-based hydroelectric generator and preparation method and application thereof

Abstract

The invention belongs to the technical field of generators, and particularly relates to a paper-based hydroelectric generator and a preparation method and application thereof. The paper-based hydroelectric generator comprises a hydrophobic area located on the surface of a paper-based material and a hydrophilic area located in the hydrophobic area. The hydrophilic area is composed of one or more sub-areas which are arranged at intervals; conductive nanoparticles are arranged on the surfaces of the sub-regions; the conductive nano particles comprise polypyrrole nano particles; the sub-regions are connected with Mg electrodes and conductive slurry electrodes; and the Mg electrode is not in contact with the conductive slurry electrode. The specific electrodes are connected to the two ends of the hydrophilic area, it can be guaranteed that the paper-based hydroelectric generator has high voltage output, more stable voltage output is achieved, and the power supply requirement of commercial electronic devices can be met. Meanwhile, the paper-based material with the hydrophobic region and the hydrophilic region has lower resistance by adopting the conductive nano-particles of specific types, so that the paper-based material has higher current output.

Description

Technical Field

[0001] This invention belongs to the field of generator technology, and specifically relates to a paper-based hydroelectric generator, its preparation method, and its application. Background Technology

[0002] With the continuous development of wearable electronic products, the further development of green and sustainable energy supply devices has attracted increasing attention. Research shows that moisture-induced power generation materials can convert water / moisture into continuous electrical energy, demonstrating significant advantages in the field of green energy harvesting. Due to its simple structural design and continuous, stable power output, moisture-induced power generation technology holds promise for application in various wearable products, such as medical diagnostics, health management, wearable energy harvesting, and smart sensing.

[0003] Paper fiber is a typical and ideal natural material for water-induced power generation. Its surface possesses abundant hydrophilic functional groups (-OH and -COOH) that are easily chemically modified, a fiber matrix with high water transport efficiency, and the ability to be flexibly processed and patterned to meet diverse application needs. These characteristics make its wide application in water-induced power generation possible. Paper fibers primarily generate a potential difference by causing the dissociation of the hydrophilic functional groups -OH and -COOH on their surface in water, resulting in an asymmetric difference in cation and anion concentrations at both ends of the paper.

[0004] Currently, paper-based moisture-triggered power harvesting devices primarily utilize water evaporation and the asymmetric distribution of moisture / water vapor to trigger an asymmetric ion concentration difference across the paper substrate, thereby generating electricity. However, the weak interaction between the fiber molecular chains and water in the paper substrate limits the dissociation dynamics of functional groups on the paper surface, making it difficult to maintain a significant ion concentration difference across the paper substrate, thus directly affecting the device's electrical output power. Furthermore, most paper-based hydroelectric generators employ a sandwich-like structure, requiring a continuous water source or a high-humidity environment for application, reducing their application flexibility. In addition, practical applications of paper-based hydroelectric generators require multiple unit connections to meet the power supply needs of commercial electronic devices, necessitating complex circuit connections, which undoubtedly increases the circuit failure rate and subsequent maintenance costs.

[0005] Therefore, it is of great significance to provide a paper-based hydroelectric generator that has both good voltage output and stable voltage output. Summary of the Invention

[0006] The present invention aims to solve one or more technical problems existing in the prior art, and at least provide a beneficial solution. Specifically, the present invention provides a paper-based hydroelectric generator that has good voltage output and good voltage output stability.

[0007] The inventive concept of this invention: The paper-based hydroelectric generator of this invention includes a hydrophobic region located on the surface of the paper-based material and a hydrophilic region located within the hydrophobic region; the hydrophilic region is composed of one or more spaced sub-regions;

[0008] The surface of the sub-region has conductive nanoparticles; the conductive nanoparticles include polypyrrole nanoparticles.

[0009] The sub-region is connected to a Mg electrode and a conductive paste electrode; the Mg electrode and the conductive paste electrode do not contact each other.

[0010] This invention, by connecting specific electrodes to sub-regions of the hydrophilic region, ensures that the paper-based hydroelectric generator has a high and more stable voltage output, meeting the power supply requirements of commercial electronic devices. Simultaneously, by employing specific types of conductive nanoparticles, the paper-based material with both hydrophobic and hydrophilic regions exhibits lower resistance, thereby achieving higher current output.

[0011] Therefore, a first aspect of the present invention provides a paper-based hydroelectric generator.

[0012] Specifically, the paper-based hydroelectric generator includes a hydrophobic region on the surface of the paper-based material and a hydrophilic region within the hydrophobic region; the hydrophilic region is composed of one or more spaced sub-regions.

[0013] The surface of the sub-region has conductive nanoparticles; the conductive nanoparticles include polypyrrole nanoparticles.

[0014] The sub-region is connected to a Mg electrode and a conductive paste electrode; the Mg electrode and the conductive paste electrode do not contact each other.

[0015] Preferably, the conductive paste electrode is located on the hydrophobic region.

[0016] Preferably, the paper-based material is hydrophilic.

[0017] Preferably, the paper-based material includes any one of filter paper, writing paper, printing paper, and packaging paper.

[0018] Preferably, a photocurable ink layer is provided on the hydrophobic region.

[0019] Preferably, the hydrophobic region is obtained by screen printing photocurable ink onto the surface of a paper-based material, followed by photocuring.

[0020] Preferably, the photocurable ink is a UV-curable ink.

[0021] Preferably, the photocuring process is a UV photocuring process.

[0022] Preferably, the hydrophilic region is an area that has not been printed with UV-curable ink and has not undergone UV curing treatment.

[0023] Specifically, screen printing is performed using a screen printing stencil to form hydrophobic and hydrophilic regions on the surface of the paper-based material. Since the hydrophilic regions are not printed with UV-cured ink and have not undergone UV curing treatment, they are essentially hydrophilic paper-based materials and exhibit hydrophilic properties.

[0024] Preferably, the conductive nanoparticles have a particle size of 60-100 nm.

[0025] Preferably, the conductive paste electrode includes an Ag / AgCl electrode.

[0026] Preferably, the number of sub-regions is ≥2, and the sub-regions are arranged in an array-like matrix distribution.

[0027] Preferably, adjacent sub-regions are connected via the conductive paste electrode.

[0028] Preferably, when the sub-regions of the hydrophilic region are arranged in an array-like matrix, the screen printing uses a specific screen printing stencil with a pre-designed array-like matrix pattern; more preferably, the screen printing stencil has a pre-designed array-like matrix rectangular pattern.

[0029] Specifically, because the screen printing stencil has a pre-designed arrayed matrix pattern, a corresponding arrayed matrix pattern will be obtained on the paper base material after printing. Hydrophobic areas are formed in the areas printed with UV-cured ink and treated with UV curing; while the paper base material itself is hydrophilic, and the areas that are not printed with UV-cured ink and have not been treated with UV curing are equivalent to the paper base material itself, thus forming hydrophilic areas.

[0030] A second aspect of the present invention provides a method for preparing the paper-based hydroelectric generator described in the first aspect of the present invention.

[0031] Specifically, the method for preparing the paper-based hydroelectric generator includes the following steps:

[0032] A photocurable ink layer with a hollowed-out shape is formed on the surface of the paper-based material to create the hydrophobic region;

[0033] The area containing the hollowed-out shape is the hydrophilic region; the conductive nanoparticles are formed by in-situ polymerization in the hydrophilic region.

[0034] The paper-based hydroelectric generator is fabricated by setting the Mg electrode and the conductive slurry electrode.

[0035] Preferably, a screen printing stencil with an arrayed matrix structure is used to print photocurable ink onto the surface of the paper-based material, and then photocures it to obtain a hydrophobic region.

[0036] Specifically, after photocuring, a photocured ink layer with a hollowed-out shape is obtained, which is the hydrophobic area.

[0037] Preferably, the in-situ polymerization process involves placing a paper-based material with hydrophobic and hydrophilic regions sequentially in an oxidant and a solution containing conductive monomers to carry out a polymerization reaction.

[0038] Preferably, the oxidant includes an oxidant containing metal ions.

[0039] Preferably, the metal ions in the metal ion-containing oxidant include iron ions.

[0040] More preferably, the oxidant containing metal ions includes at least one of FeCl3 and FeCl3·5H2O.

[0041] Preferably, the paper-based material with hydrophobic and hydrophilic regions is fully immersed in an oxidant solution containing metal ions to promote the in-situ oxidative polymerization reaction of the conductive monomers in subsequent experimental steps, forming conductive nanoparticles on the hydrophilic regions.

[0042] Preferably, the mass percentage of the oxidant containing metal ions in the oxidant solution is 1.5-2.5%.

[0043] More preferably, the mass percentage of the oxidant containing metal ions in the oxidant solution is 1.8-2.2%.

[0044] More preferably, the mass percentage of the oxidant containing metal ions in the oxidant solution is 2%.

[0045] Preferably, the conductive monomer includes a pyrrole monomer.

[0046] Specifically, this invention uses specific monomers to carry out oxidative polymerization reactions to obtain specific types of conductive nanoparticles, which can make paper-based materials with hydrophilic regions have lower resistance.

[0047] This invention utilizes the chemical and electrical energy released by a water-triggered metal galvanic cell to compensate for the insufficient electrical output of a paper-based hydroelectric generator. Furthermore, by customizing the patterning on the surface of the paper-based material, an integrated design of the paper-based hydroelectric generator can be achieved, enabling the simultaneous fabrication of a paper-based hydroelectric generator that balances high power output and integrated design.

[0048] Preferably, the solution containing the conductive monomer includes an aqueous solution containing the conductive monomer.

[0049] Preferably, the conductive monomer in the aqueous solution contains 1.5-2.5% by mass.

[0050] More preferably, the conductive monomer in the aqueous solution contains 1.8-2.2% by mass.

[0051] More preferably, the conductive monomer accounts for 2% of the mass of the aqueous solution containing the conductive monomer.

[0052] Preferably, after the polymerization reaction, the paper-based material with hydrophobic and hydrophilic regions is first dried, and then one end of the hydrophilic region is connected to the Mg electrode, and the other end is connected to the conductive slurry electrode.

[0053] Specifically, the hydrophilic regions on the paper-based material are immersed in a solution loaded with metal ions (such as Fe). 3+ In the presence of an oxidizing agent, pyrrole monomers are triggered to polymerize in situ in the hydrophilic region of the paper-based material, yielding conductive nanoparticles, such as conductive polypyrrole nanoparticles, thus forming conductive paper. By connecting a Mg electrode to one end of the hydrophilic region containing conductive nanoparticles (equivalent to the paper-based material containing conductive nanoparticles) and a conductive slurry electrode to the other end, deionized water can be added directly or hygroscopic LiCl can be introduced. LiCl, acting as a hygroscopic agent, spontaneously deliquesces to absorb moisture from the air, maintaining the wettability of the conductive paper. Furthermore, the moisture triggers a redox reaction at the interface between the paper-based material containing conductive nanoparticles and the Mg electrode, releasing electrical energy. The conductive slurry electrode, such as an Ag / AgCl electrode, only serves as a conductive connection and does not participate in the galvanic cell reaction.

[0054] Preferably, the method for preparing the paper-based hydroelectric generator includes the following steps:

[0055] (1) Using a screen printing stencil with an arrayed matrix structure, UV-curable ink is printed on the surface of the paper base material. After UV curing, a UV-curable ink layer with a hollow shape is obtained, which is the hydrophobic area; while the areas without UV-curable ink and the areas without UV curing treatment form the hydrophilic area, thus obtaining the treated paper base material.

[0056] (2) The treated paper-based material is placed in an oxidant and a solution containing conductive monomers in sequence to carry out a polymerization reaction; then one end of the hydrophilic region is connected to a Mg electrode and the other end is connected to a conductive slurry electrode to obtain the paper-based hydroelectric generator.

[0057] Preferably, in step (1), a screen printing plate with an arrayed matrix structure is used for printing; more preferably, a screen printing plate with an arrayed matrix rectangular structure is used for printing.

[0058] Specifically, after the processing in step (1), hydrophobic and hydrophilic regions are obtained on the paper-based material, and the hydrophilic region is composed of one or more sub-regions arranged in an array matrix.

[0059] A third aspect of the present invention provides a wearable electronic product.

[0060] Specifically, the wearable electronic product includes the paper-based hydroelectric generator described in the first aspect of the present invention.

[0061] The paper-based hydroelectric generator of this invention can continuously and stably output electrical energy and has a good output voltage. It can be applied to various wearable applications, such as medical diagnosis, health management, wearable energy harvesting and smart sensing, etc., to meet the output voltage requirements of wearable products.

[0062] Compared with the prior art, the beneficial effects of the technical solution provided by the present invention are as follows:

[0063] (1) By connecting specific electrodes to both ends of the sub-region in the hydrophilic region, this invention can ensure that the paper-based hydroelectric generator has a higher voltage output and a more stable voltage output, which can meet the power supply requirements of commercial electronic devices. At the same time, by using specific types of conductive nanoparticles, the paper-based material with hydrophobic and hydrophilic regions has a lower resistance, thereby achieving a higher current output.

[0064] (2) This invention utilizes in-situ polymerization to achieve scalable preparation of conductive paper-based materials. In the conductive paper-based material, the chemical electrical energy released by a water-triggered metal galvanic cell compensates for the insufficient electrical output of the paper-based hydroelectric generator, thereby increasing its electrical output power. Furthermore, by customizing the patterning on the surface of the paper-based material, an integrated design of the paper-based hydroelectric generator can be achieved, simultaneously realizing the preparation of a paper-based hydroelectric generator that balances high power output and integration. Attached Figure Description

[0065] Figure 1 This is a schematic diagram of the preparation process of the paper-based hydroelectric generator in Embodiment 1 of the present invention;

[0066] Figure 2 This is a scanning electron microscope image of polypyrrole conductive nanoparticles grown in situ on the surface of the hydrophilic region in Example 1 of the present invention.

[0067] Figure 3 This is a voltage output curve of a single paper-based hydroelectric generator according to Embodiment 1 of the present invention;

[0068] Figure 4 This is a voltage output curve of the paper-based hydroelectric generator integrated with 36 arrayed units in Embodiment 1 of the present invention;

[0069] Figure 5 This is a voltage output curve of a single paper-based hydroelectric generator, which is Comparative Example 2 of the present invention.

[0070] Figure 6 The voltage output test results of a single paper-based hydroelectric generator in Embodiment 1 and Comparative Example 3 of the present invention are shown in the figure.

[0071] Figure 7 The resistance test results of a single paper-based hydroelectric generator in Embodiment 1 and Comparative Example 1 of the present invention are shown in the figure.

[0072] Figure 8 This is a graph showing the voltage and current output curves of a single paper-based hydroelectric generator under different resistances in Embodiment 1 of the present invention. Detailed Implementation

[0073] To enable those skilled in the art to more clearly understand the technical solutions described in this invention, the following embodiments are provided for illustration. It should be noted that the following embodiments do not constitute a limitation on the scope of protection claimed by this invention.

[0074] Unless otherwise specified, the raw materials, reagents or devices used in the following examples are available from conventional commercial sources or can be obtained by existing known methods.

[0075] Example 1

[0076] A paper-based hydroelectric generator includes a hydrophobic region on the surface of a hydrophilic filter paper and a hydrophilic region within the hydrophobic region; the hydrophilic region consists of 36 rectangular sub-regions spaced apart.

[0077] The surface of the sub-region has conductive nanoparticles; the conductive nanoparticles are polypyrrole nanoparticles with a particle size of 50-100 nm.

[0078] One end of the sub-region is connected to the Mg electrode, and the other end is connected to the Ag / AgCl electrode; the Ag / AgCl electrode is located on the hydrophobic region and connects two adjacent hydrophilic sub-regions.

[0079] The above-mentioned method for preparing a paper-based hydroelectric generator includes the following steps:

[0080] (1) Take a piece of filter paper with dimensions of 10×10cm. The filter paper parameters are as follows: qualitative filter paper (medium speed), size: diameter 15cm, filtration speed: medium speed (filtration speed range 35-70 seconds), pore size: about 15-20μm, quantitative standard: 80g / m 2 (±4g / m 2Using a 250-mesh screen printing stencil, UV-curable ink is printed according to a pre-designed arrayed matrix rectangular pattern. The UV-curable ink is then cured by ultraviolet light to form a hydrophilic paper with an arrayed rectangular matrix structure. The areas printed with UV-curable ink are hydrophobic, while the areas not printed with UV-curable ink are hydrophilic, resulting in the treated filter paper.

[0081] (2) Transfer the filter paper to a 2% FeCl3·5H2O solution and soak it for 12 hours. Then transfer it to a 2% aqueous solution containing pyrrole monomer. After the reaction is complete, take it out and dry it for later use.

[0082] (3) Connect one end of each hydrophilic region of the filter paper after drying in step (2) to a metal Mg electrode and the other end to an Ag / AgCl electrode. The Ag / AgCl electrode connects the adjacent hydrophilic regions to obtain a paper-based hydroelectric generator that combines high power output and integrated design.

[0083] Example 1: A schematic diagram of the fabrication process of a paper-based hydroelectric generator is shown below. Figure 1 As shown.

[0084] The hydrophilicity / hydrophobicity of the filter paper surface is controlled by printing UV-curable ink. The areas with printed ink are cured under UV light to form hydrophobic regions, while the areas without ink are arrayed rectangular hydrophilic regions. This is achieved by immersing the filter paper in Fe... 3+ Ionic aqueous solutions, only the hydrophilic regions are loaded with Fe. 3+ This process triggers the in-situ polymerization of pyrrole monomers in the hydrophilic region, yielding conductive polypyrrole nanoparticles, which in turn produce conductive polypyrrole paper. By connecting a Mg electrode to one end of the conductive polypyrrole paper and an Ag / AgCl electrode to the other end, the addition of water or the introduction of hygroscopic LiCl triggers a redox reaction of Mg metal at the interface between the conductive polypyrrole paper and the Mg electrode, releasing electrical energy. The Ag / AgCl electrode only serves as a conductive connection and does not participate in the galvanic cell reaction.

[0085] The galvanic cell reaction triggered by moisture on a magnesium metal electrode is as follows:

[0086] Anode: Mg-2e - +2OH-→Mg(OH)2;

[0087] Cathode: 2H + +2e - →H2.

[0088] Comparative Example 1

[0089] The difference between Comparative Example 1 and Example 1 is that the types of monomers are different, that is, steps (1) and (3) are the same as in Example 1.

[0090] The specific steps (2) in the preparation process of the paper-based hydroelectric generator in Comparative Example 1 are as follows:

[0091] The filter paper was transferred to a 2% FeCl3·5H2O solution and soaked for 12 hours. Then it was transferred to a 2% aqueous solution containing aniline monomer. After the reaction was complete, the filter paper was removed and dried for later use.

[0092] Comparative Example 2

[0093] The difference between Comparative Example 2 and Example 1 is that the types of electrodes are different, that is, steps (1) and (2) are the same as in Example 1.

[0094] The specific steps (3) in the preparation process of the paper-based hydroelectric generator in Comparative Example 2 are as follows:

[0095] Connect the two ends of each hydrophilic region of the filter paper after drying in step (2) to Ag / AgCl electrodes, and connect adjacent hydrophilic regions with Ag / AgCl electrodes to obtain an integrated paper-based hydroelectric generator.

[0096] Comparative Example 3

[0097] The difference between Comparative Example 3 and Example 1 is that the types of electrodes are different. That is, steps (1) and (2) are the same as in Example 1, while the Mg electrode in step (3) of Comparative Example 3 is replaced by aluminum electrode, zinc electrode, copper electrode and iron electrode respectively. The rest is the same as in Example 1.

[0098] Performance testing

[0099] 1. Scanning electron microscopy observation

[0100] Scanning electron microscopy (SEM) was performed on the polypyrrole conductive nanoparticles grown in situ on the surface of the hydrophilic region in Example 1. The SEM results are as follows: Figure 2 As shown. Among them, Figure 2 Figures a and b in the image are scanning electron microscope images at different magnifications, respectively. Figure 2 Figure b is an enlarged view of the area within the box in Figure a.

[0101] Depend on Figure 2 It can be seen that, through oxidative polymerization, polypyrrole conductive nanoparticles are grown in situ on the surface of the hydrophilic region.

[0102] 2. Output voltage test

[0103] (1) A voltage output test was performed on a single paper-based hydroelectric generator formed by a single hydrophilic region in Example 1. During the voltage test, the two electrode clips of the Keithley power meter were connected to the two ends of the single paper-based hydroelectric generator to complete the voltage test. The voltage output curve is shown below. Figure 3 As shown.

[0104] Depend on Figure 3 As can be seen, in Example 1, a single paper-based hydroelectric generator can reach a voltage of about 2V after working continuously for 11 days, demonstrating long-term voltage output stability.

[0105] (2) The voltage output of the paper-based hydroelectric generator integrated with 36 arrayed units in Example 1 was tested. Similarly, the voltage test was completed by connecting two electrode clips from the Keithley source meter to the two ends of the 36 paper-based hydroelectric generators connected in series. The voltage output curve is shown in Figure 1. Figure 4 As shown.

[0106] Depend on Figure 4 It can be seen that by integrating 36 paper-based hydroelectric generators onto a single filter paper, the voltage can be increased to 64V.

[0107] (3) The voltage output of a single paper-based hydroelectric generator in Comparative Example 2 was tested using the same method as above. The voltage output curve is shown in Figure 2. Figure 5 As shown.

[0108] Depend on Figure 5 As can be seen, the voltage output of a single paper-based hydroelectric generator in Comparative Example 2 is only maintained at around 80mV. This is because when both ends of the hydrophilic region with polypyrrole conductive nanoparticles are connected to Ag / AgCl electrodes, the galvanic cell reaction of the metal electrodes does not occur. At this time, the electrical energy only comes from the current potential generated by water evaporation, resulting in a significantly lower voltage output.

[0109] Depend on Figure 3 , 5 The comparison shows that the use of specific types of electrodes at both ends of the hydrophilic region of the paper-based hydroelectric generator of the present invention can improve the output voltage of the paper-based hydroelectric generator.

[0110] (4) Voltage output tests were conducted on individual paper-based hydroelectric generators from Examples 1 and 3, using the same testing method as above. The voltage output results are as follows. Figure 6 As shown.

[0111] Depend on Figure 6 It can be seen that by comparing the voltage output of paper-based hydroelectric generators obtained with different metal electrodes, the galvanic cell with the introduction of a Mg metal electrode has a significantly higher voltage output.

[0112] 3. Resistance test

[0113] Resistance tests were performed on the individual paper-based hydroelectric generators in Example 1 and Comparative Example 1. Specifically, the resistance of the filter paper containing the individual paper-based hydroelectric generators was tested. The method involved cutting conductive paper to a fixed size (5×10mm), connecting the conductive paper to the two electrode clips of a Keithley source meter, selecting the resistance test option in the source meter, and measuring the resistance of the conductive paper. The test results are as follows: Figure 7 As shown.

[0114] Depend on Figure 7 It can be seen that, compared to polyaniline conductive nanoparticles, when the hydrophilic region surface has polypyrrole conductive nanoparticles, the filter paper has lower resistance and thus higher current output.

[0115] 4. Voltage and current output test

[0116] The voltage and current output of a single paper-based hydroelectric generator under different resistances were tested in Example 1. The specific test method was to connect the two electrode clips of the Keithley source meter to the two electrodes of the paper-based hydroelectric generator, and select the VT and IT test options in the source meter to measure the voltage and current of the paper-based hydroelectric generator.

[0117] Example 1: Voltage and current output curves of a single paper-based hydroelectric generator under different resistances are shown below. Figure 8 As shown.

[0118] Depend on Figure 8 It can be seen that the voltage of the paper-based hydroelectric generator is less affected by the resistance, while the current output is mainly affected by the resistance; a smaller resistance results in a higher current output.

[0119] In summary, by connecting specific electrodes to both ends of the hydrophilic region, this invention ensures that the paper-based hydroelectric generator has a high and more stable voltage output, meeting the power supply requirements of commercial electronic devices. Simultaneously, by employing specific types of conductive nanoparticles, the paper-based material with both hydrophobic and hydrophilic regions exhibits lower resistance, thereby resulting in higher current output.

[0120] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A paper-based hydroelectric generator, characterized in that, It includes a hydrophobic region located on the surface of the paper-based material and a hydrophilic region located within the hydrophobic region; the hydrophilic region is composed of one or more spaced sub-regions; The surface of the sub-region has conductive nanoparticles; the conductive nanoparticles include polypyrrole nanoparticles. The sub-region is connected to a Mg electrode and a conductive paste electrode; the Mg electrode and the conductive paste electrode do not contact each other.

2. The paper-based hydroelectric generator according to claim 1, characterized in that, The paper-based material includes any one of filter paper, writing paper, printing paper, and packaging paper.

3. The paper-based hydroelectric generator according to claim 1, characterized in that, A photocurable ink layer is provided on the hydrophobic area.

4. The paper-based hydroelectric generator according to claim 1, characterized in that, The conductive paste electrode includes an Ag / AgCl electrode.

5. The paper-based hydroelectric generator according to any one of claims 1-4, characterized in that, The number of sub-regions is ≥2, and the sub-regions are arranged in an array-like matrix distribution.

6. The paper-based hydroelectric generator according to claim 5, characterized in that, Adjacent sub-regions are connected via the conductive paste electrodes.

7. The method for preparing the paper-based hydroelectric generator according to any one of claims 1-6, characterized in that, Includes the following steps: A photocurable ink layer with a hollowed-out shape is formed on the surface of the paper-based material to create the hydrophobic region; The area containing the hollowed-out shape is the hydrophilic region; the conductive nanoparticles are formed by in-situ polymerization in the hydrophilic region. The paper-based hydroelectric generator is fabricated by setting the Mg electrode and the conductive slurry electrode.

8. The preparation method according to claim 7, characterized in that, A screen printing stencil with an arrayed matrix structure is used to print photocurable ink onto the surface of the paper-based material, and then photocures it to obtain a hydrophobic region.

9. The preparation method according to claim 7, characterized in that, The in-situ polymerization process involves placing a paper-based material with hydrophobic and hydrophilic regions sequentially in an oxidant and a solution containing conductive monomers to carry out a polymerization reaction.

10. A wearable electronic product, characterized in that, Includes the paper-based hydroelectric generator as described in any one of claims 1-6.

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