Multi-scene energy collection friction nanogenerator and processing method thereof

Abstract

This invention provides a method for processing a triboelectric nanogenerator capable of harvesting energy in multiple scenarios, comprising: dropping a solution containing hydroxide ions onto the front side of a carbon-based thin film and allowing it to crystallize to form a first solution crystal; processing the first solution crystal with a laser device to form a hydrophilic graphene electrode, and connecting a first wire to the hydrophilic graphene electrode; dropping a solution containing a fluoropolymer onto the back side of the carbon-based thin film and allowing it to solidify to form a second solution crystal; processing the second solution crystal with a laser device to form a hydrophobic graphene electrode, and connecting a second wire to the hydrophobic graphene electrode to form a triboelectric nanogenerator for harvesting droplet energy; wetting the triboelectric nanogenerator for harvesting droplet energy and then wrapping it around a shaping rod and heating it to form a coiled droplet energy harvesting device; and installing the droplet energy harvesting device on a solar energy harvesting module to form a triboelectric nanogenerator capable of harvesting energy in multiple scenarios, which has high harvesting efficiency, a simple and convenient processing method, and low harvesting cost.

Description

Technical Field

[0001] This invention relates to the field of triboelectric nanogenerator technology, and in particular to a triboelectric nanogenerator for multi-scenario energy harvesting and its fabrication method. Background Technology

[0002] With global energy demand increasing year by year, the collection of clean energy has become increasingly important in today's society. This is because the use of traditional energy sources has led to serious environmental problems and the risk of energy shortages. Therefore, we urgently need to find new methods to collect and utilize renewable energy to reduce negative environmental impacts and ensure a sustainable energy supply. Water resources and solar energy, as two important forms of renewable energy, have attracted widespread attention and research. Triboelectric nanogenerators are a cutting-edge energy harvesting technology that converts mechanical energy into electrical energy by utilizing the friction between droplets and solid surfaces, providing an innovative solution for the development of renewable energy collection. In the research of triboelectric nanogenerators, the contact surface between droplets and solid surfaces is the key to energy conversion. By introducing superhydrophobic surfaces, the rapid separation of droplets and solid interfaces can effectively improve the efficiency and performance of triboelectric nanogenerators.

[0003] However, existing technologies collect water resources and solar energy separately, resulting in single energy sources, low collection efficiency, inability to collect energy in multiple scenarios, low practicality, and significant time costs.

[0004] Therefore, there is an urgent need to provide a triboelectric nanogenerator for multi-scenario energy harvesting and its fabrication method to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to address the technical deficiencies in the existing technology by providing a triboelectric nanogenerator for multi-scenario energy harvesting and its processing method.

[0006] To achieve the objectives of this invention, the technical solution adopted is as follows:

[0007] A method for fabricating a triboelectric nanogenerator for multi-scenario energy harvesting includes:

[0008] S1, a carbon-based thin film is provided, and a solution containing hydroxide ions is dropped onto the front side of the carbon-based thin film using a dropper, so that the solution containing hydroxide ions crystallizes on the front side of the carbon-based thin film to form a first solution crystal containing hydroxide ions.

[0009] S2, using a laser device to process the area containing the first solution crystal on the front side of the carbon-based thin film to form a hydrophilic graphene electrode, and connecting a first wire at the hydrophilic graphene electrode;

[0010] S3, flip the carbon-based film to the back side, use a dropper to drop a fluoropolymer solution onto the back side of the carbon-based film, and allow the fluoropolymer solution to solidify on the back side of the carbon-based film to form a second solution crystal of fluoropolymer.

[0011] S4, using a laser device to process the region containing the second solution crystal on the back of the carbon-based thin film to form a hydrophobic graphene electrode, and connecting a second wire at the hydrophobic graphene electrode to form a triboelectric nanogenerator that collects droplet energy, consisting of the carbon-based thin film, the hydrophilic graphene electrode, the hydrophobic graphene electrode, the first wire, and the second wire.

[0012] S5, the triboelectric nanogenerator for collecting droplet energy is moistened, and the moistened triboelectric nanogenerator for collecting droplet energy is wrapped around a shaping rod, and the triboelectric nanogenerator for collecting droplet energy wrapped around the shaping rod is heated to form a curled droplet energy collecting device.

[0013] S6, The droplet energy harvesting device is installed on the solar energy harvesting module to form a triboelectric nanogenerator for multi-scenario energy harvesting.

[0014] Preferably, the formation of the first solution crystal in S1 includes the following steps: heating the hydroxide ion-containing solution at a constant temperature of 60 degrees Celsius for 30 minutes to evaporate and crystallize the water in the hydroxide ion-containing solution to form the first solution crystal.

[0015] Preferably, the carbon-based film has a thickness of 50 μm, and the carbon-based film is any one of polyimide film, polyetherimide film, and polyaniline film; the hydroxide ion-containing solution is any one of potassium hydroxide solution, sodium hydroxide, and barium hydroxide, and the potassium hydroxide solution has a thickness of 100 μm on the surface of the polyimide film.

[0016] Preferably, the laser device has a laser wavelength of 340nm-360nm, a laser power of 1W-5W, and a pulse width of 10ps.

[0017] Preferably, the formation of the second solution crystal in S3 includes the following steps: heating the fluoropolymer solution at a constant temperature of 50 degrees Celsius for 30 minutes to solidify the fluoropolymer solution and form the second solution crystal.

[0018] Preferably, the fluoropolymer solution is any one of polytetrafluoroethylene solution, perfluoroallyl ether solution, polyvinyl fluoride solution, and polyvinyl fluoride solution.

[0019] This invention also provides a triboelectric nanogenerator for multi-scenario energy harvesting, characterized in that the triboelectric nanogenerator for multi-scenario energy harvesting includes a solar energy harvesting module and a droplet energy harvesting device installed on the solar energy harvesting module; the droplet energy harvesting device includes a carbon-based thin film, a hydrophilic graphene electrode formed on the front side of the carbon-based thin film, a hydrophobic graphene electrode formed on the back side of the carbon-based thin film, a first wire connected to the hydrophilic graphene electrode, and a second wire connected to the hydrophobic graphene electrode. Preferably, the positive terminal of the electrical signal detection instrument is connected to the metal electrode, and the negative terminal of the electrical signal detection instrument is grounded.

[0020] Compared with related technologies, the triboelectric nanogenerator for multi-scenario energy harvesting and its processing method provided by this invention involves forming hydrophilic and hydrophobic graphene electrodes on the front and back sides of a carbon-based thin film, respectively, and connecting a first wire and a second wire to the hydrophilic and hydrophobic graphene electrodes, respectively, to form a triboelectric nanogenerator for collecting droplet energy, consisting of the carbon-based thin film, the hydrophilic graphene electrode, the hydrophobic graphene electrode, the first wire, and the second wire. The triboelectric nanogenerator for collecting droplet energy is then moistened, wrapped around a shaping rod, and heated to form a curled droplet energy harvesting device. Finally, the droplet energy harvesting device is installed on a solar energy harvesting module to form a triboelectric nanogenerator for multi-scenario energy harvesting. This triboelectric nanogenerator for multi-scenario energy harvesting can automatically flatten or curl according to the ambient humidity. It automatically flattens to collect raindrop energy during rain and automatically curls to collect solar energy during sunny weather. When the generator is flattened, the solar energy harvesting module serves as a base, effectively providing support; the structures complement each other. This structure further improves energy harvesting efficiency, integrating the harvesting of droplet energy and solar energy, enriching the ways people utilize water resources, and achieving seamless energy harvesting in both sunny and rainy weather. It boasts higher harvesting efficiency, simpler and more convenient processing methods, and lower harvesting costs. Furthermore, this seamless energy harvesting method fully utilizes energy resources under different weather conditions, making energy harvesting more stable and reliable. In addition, combining droplet energy and solar energy harvesting methods can increase energy diversity, reduce dependence on a single energy source, and improve the robustness and sustainability of triboelectric nanogenerators for multi-scenario energy harvesting. Attached Figure Description

[0021] The present invention will now be described in detail with reference to the accompanying drawings. The above and other aspects of the present invention will become clearer and more readily understood through the detailed description following the accompanying drawings. In the drawings:

[0022] Figure 1 This is a schematic flowchart of the fabrication method for the triboelectric nanogenerator for multi-scenario energy harvesting of the present invention;

[0023] Figure 2 This is a structural flowchart of the triboelectric nanogenerator fabrication method for multi-scenario energy harvesting according to the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of the carbon-based thin film coated with a solution containing hydroxide ions;

[0025] Figure 4 This is a schematic diagram of the structure of the laser-processed hydrophilic graphene electrode;

[0026] Figure 5 This is a schematic diagram of the structure in which the carbon-based thin film is coated with a fluoropolymer solution on its back side;

[0027] Figure 6 This is a schematic diagram of the structure of a laser-processed hydrophobic graphene electrode;

[0028] Figure 7 This is a schematic diagram of the curled-up structure of a triboelectric nanogenerator that collects droplet energy.

[0029] Figure 8 This is a schematic diagram of the assembly of a droplet energy harvesting device and a solar energy harvesting module;

[0030] Figure 9 This is a schematic diagram of the structure of the triboelectric nanogenerator for multi-scenario energy harvesting of the present invention;

[0031] Figure 10 This is a schematic diagram illustrating the working principle of the triboelectric nanogenerator for multi-scenario energy harvesting of the present invention. Detailed Implementation

[0032] The specific embodiments and examples described herein are specific implementations of the present invention, used to illustrate the concept of the invention, and are illustrative and exemplary, and should not be construed as limiting the implementation methods or scope of the present invention. In addition to the embodiments described herein, those skilled in the art can employ other obvious technical solutions based on the content disclosed in the claims and specification of this application. These technical solutions include those that make any obvious substitutions and modifications to the embodiments described herein, all of which are within the protection scope of the present invention.

[0033] Please refer to Figure 1-7 As shown, the present invention provides a method for fabricating a triboelectric nanogenerator for multi-scenario energy harvesting, comprising:

[0034] S1, a carbon-based thin film 103 is provided, and a solution 102 containing hydroxide ions is dropped onto the front side of the carbon-based thin film 103 using a dropper 101, so that the solution 102 containing hydroxide ions crystallizes on the front side of the carbon-based thin film 103 to form a first solution crystal containing hydroxide ions.

[0035] S2, using laser equipment 201 to process the area containing the first solution crystal on the front side of the carbon-based thin film 103 to form a hydrophilic graphene electrode 202, and connecting the first wire 801 at the hydrophilic graphene electrode 202;

[0036] S3, flip the carbon-based film 103 to the back side, use a dropper 101 to drop a fluoropolymer solution 301 onto the back side of the carbon-based film 103, and let the fluoropolymer solution 301 solidify on the back side of the carbon-based film 103 to form a second solution crystal of fluoropolymer.

[0037] S4, using a laser device to process the region containing the second solution crystal on the back side of the carbon-based thin film 103 to form a hydrophobic graphene electrode 401, and connecting a second wire 802 to the hydrophobic graphene electrode 401 to form a triboelectric nanogenerator for collecting droplet energy, consisting of the carbon-based thin film 103, the hydrophilic graphene electrode 202, the hydrophobic graphene electrode 401, the first wire 801 and the second wire 802.

[0038] S5, the triboelectric nanogenerator for collecting droplet energy is moistened, and the moistened triboelectric nanogenerator for collecting droplet energy is wrapped around the shaping rod 501, and the triboelectric nanogenerator for collecting droplet energy wrapped around the shaping rod 501 is heated to form a curled droplet energy collecting device 502.

[0039] S6, the droplet energy harvesting device 502 is installed on the solar energy harvesting module 601 to form a triboelectric nanogenerator for multi-scenario energy harvesting.

[0040] The aforementioned triboelectric nanogenerator for multi-scenario energy harvesting can automatically flatten or curl up according to ambient humidity. It automatically flattens to collect raindrop energy during rain and automatically curls up to collect solar energy during sunny weather. When flattened, the generator uses a solar energy collection module as a base, which effectively provides support, creating a complementary structure. This design further improves energy harvesting efficiency, integrating the collection of droplet energy and solar energy, enriching the ways people utilize water resources, and achieving seamless energy harvesting in both sunny and rainy weather. It boasts higher harvesting efficiency, simpler and more convenient processing methods, and lower collection costs. Furthermore, this seamless energy harvesting method fully utilizes energy resources under different weather conditions, making energy harvesting more stable and reliable. In addition, combining droplet energy and solar energy harvesting methods increases energy diversity, reduces dependence on a single energy source, and improves the robustness and sustainability of the triboelectric nanogenerator for multi-scenario energy harvesting.

[0041] Specifically, the formation of the first solution crystal in S1 includes the following steps: heating the hydroxide ion-containing solution at a constant temperature of 60 degrees Celsius for 30 minutes to evaporate and crystallize the water in the hydroxide ion-containing solution to form the first solution crystal. Evaporating and crystallizing the water in the hydroxide ion-containing solution to form the first solution crystal is for better laser processing, because the solution will exhibit energy reflection and scattering.

[0042] In this embodiment, the carbon-based film 103 has a thickness of 50 μm, and the carbon-based film 103 is any one of polyimide film, polyetherimide film, and polyaniline film; the hydroxide ion-containing solution 102 is any one of potassium hydroxide solution, sodium hydroxide, and barium hydroxide, and the potassium hydroxide solution has a thickness of 100 μm on the surface of the polyimide film.

[0043] Furthermore, the laser device 201 has a laser wavelength of 340nm-360nm, a laser power of 1W-5W, and a pulse width of 10ps. This type of laser processing is used because the first solution crystal provides hydroxyl groups for the laser-induced graphene process, making the processed graphene hydrophilic.

[0044] Furthermore, the formation of the second solution crystal in S3 includes the following steps: heating the fluoropolymer solution at a constant temperature of 50 degrees Celsius for 30 minutes to solidify the fluoropolymer solution and form the second solution crystal.

[0045] In this embodiment, the fluoropolymer solution 301 is any one of polytetrafluoroethylene solution, polyperfluoroallyl ether solution, polyvinyl fluoride solution, and polyvinyl fluoride solution. Of course, it is not limited to this.

[0046] In this embodiment, in step S4, a hydrophobic graphene electrode is formed by processing the region containing the second solution crystal on the back side of the carbon-based thin film using a laser device. The principle is that under high temperature and pressure from the laser, fluorine atoms in the second solution crystal diffuse into the graphene, forming fluorine-doped superhydrophobic graphene.

[0047] It should be noted that the principle of the curling and shaping of the droplet energy harvesting device is that one side of the hydrophilic graphene electrode of the carbon-based thin film consists of a group of two-dimensional nanosheets of single atomic layers, which are interdependent and mutually constrained, and interact with external water molecules. Therefore, the shape of one side of the hydrophilic graphene electrode of the carbon-based thin film mainly depends on the stacking arrangement of the hydrophilic graphene nanosheets and the adsorption / desorption of water through quantum-confined superfluid channels. To define the morphology of one side of the hydrophilic graphene electrode of the carbon-based thin film, four typical steps can be used: wetting, shaping, dehydration, and release. First, when one side of the hydrophilic graphene electrode of the carbon-based thin film is wetted, water molecules interact with the oxygen-containing groups of the hydrophilic graphene by forming hydrogen bonds, causing the hydrophilic graphene film to expand. Then, mechanical force is applied to deform one side of the hydrophilic graphene electrode of the carbon-based thin film, inducing the stretching and compression of the hydrophilic graphene film at different positions. Considering the increased interlayer spacing and the lubrication effect of water molecules, the deformation and sliding of individual hydrophilic graphene nanosheets become easier. When water is removed, hydrodesorption occurs, and mechanical strain at the compression site (e.g., the inner side of a bend) causes wrinkles. The removal of the external force can partially release internal stress, resulting in temporary shapes formed by the wrinkling and rearrangement of the hydrophilic graphene nanosheets. Under water-driven conditions, the temporary shapes may deform back to their original shapes upon water absorption because the quantum-confined superfluid channels control water transport. One side of the hydrophilic graphene electrode of the carbon-based film can also be reshaped by repeating four steps, and each temporary shape can reversibly deform back to its original state under water-driven conditions.

[0048] In this embodiment, the droplet energy collection device 502 is installed above the solar energy collection module 601. The size of the solar energy module can be determined according to the actual size. If the size of the droplet energy collection device is much smaller than the size of the solar energy collection module, multiple devices can be installed until the entire solar energy collection module panel is covered.

[0049] Reference Figure 8 As shown, this embodiment of the invention also provides a triboelectric nanogenerator for multi-scenario energy harvesting. The triboelectric nanogenerator for multi-scenario energy harvesting includes a solar energy harvesting module 601 and a droplet energy harvesting device 502 installed on the solar energy harvesting module. The droplet energy harvesting device 502 includes a carbon-based thin film 103, a hydrophilic graphene electrode 202 formed on the front side of the carbon-based thin film, a hydrophobic graphene electrode 401 formed on the back side of the carbon-based thin film 103, a first wire 801 connected to the hydrophilic graphene electrode 202, and a second wire 802 connected to the hydrophobic graphene electrode 401.

[0050] Reference Figure 9As shown, the working principle of the triboelectric nanogenerator for multi-scenario energy harvesting is as follows: During the falling process, the droplet 701 acquires a positive charge due to friction with the air. At this time, the triboelectric nanogenerator for multi-scenario energy harvesting is in electrostatic equilibrium. (See...) Figure 9 State 1: When droplet 701 first contacts the second solution crystal of the triboelectric nanogenerator for multi-scenario energy harvesting, the positively charged droplet, due to electrostatic induction, induces a negative charge on the hydrophilic graphene 202 electrode of the triboelectric nanogenerator. Electrons flow from the hydrophobic graphene electrode 401 through the external load 702 to the hydrophilic graphene electrode 202. (See below) Figure 9 State 2; When droplet 701 slides to the hydrophobic graphene electrode 401, the positively charged droplet 701 attracts electrons that flow back to the hydrophobic graphene electrode 401. (See below) Figure 9 State 3; until the droplet slides off and flows out of the triboelectric nanogenerator used for multi-scenario energy harvesting, the triboelectric nanogenerator returns to electrostatic equilibrium, see [link to previous section]. Figure 9 Status 4.

[0051] Compared with related technologies, the triboelectric nanogenerator for multi-scenario energy harvesting and its processing method provided by this invention involves forming hydrophilic and hydrophobic graphene electrodes on the front and back sides of a carbon-based thin film, respectively, and connecting a first wire and a second wire to the hydrophilic and hydrophobic graphene electrodes, respectively, to form a triboelectric nanogenerator for collecting droplet energy, consisting of the carbon-based thin film, the hydrophilic graphene electrode, the hydrophobic graphene electrode, the first wire, and the second wire. The triboelectric nanogenerator for collecting droplet energy is then moistened, wrapped around a shaping rod, and heated to form a curled droplet energy harvesting device. Finally, the droplet energy harvesting device is installed on a solar energy harvesting module to form a triboelectric nanogenerator for multi-scenario energy harvesting. This triboelectric nanogenerator for multi-scenario energy harvesting can automatically flatten or curl according to the ambient humidity. It automatically flattens to collect raindrop energy during rain and automatically curls to collect solar energy during sunny weather. When the generator is flattened, the solar energy harvesting module serves as a base, effectively providing support; the structures complement each other. This structure further improves energy harvesting efficiency, integrating the harvesting of droplet energy and solar energy, enriching the ways people utilize water resources, and achieving seamless energy harvesting in both sunny and rainy weather. It boasts higher harvesting efficiency, simpler and more convenient processing methods, and lower harvesting costs. Furthermore, this seamless energy harvesting method fully utilizes energy resources under different weather conditions, making energy harvesting more stable and reliable. In addition, combining droplet energy and solar energy harvesting methods can increase energy diversity, reduce dependence on a single energy source, and improve the robustness and sustainability of triboelectric nanogenerators for multi-scenario energy harvesting.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any alterations, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A method for fabricating a triboelectric nanogenerator for multi-scenario energy harvesting, characterized in that, The processing method includes: S1, a carbon-based thin film is provided, and a solution containing hydroxide ions is dropped onto the front side of the carbon-based thin film using a dropper, so that the solution containing hydroxide ions crystallizes on the front side of the carbon-based thin film to form a first solution crystal containing hydroxide ions. S2, using a laser device to process the area containing the first solution crystal on the front side of the carbon-based thin film to form a hydrophilic graphene electrode, and connecting a first wire at the hydrophilic graphene electrode; S3, flip the carbon-based film to the back side, use a dropper to drop a fluoropolymer solution onto the back side of the carbon-based film, and allow the fluoropolymer solution to solidify on the back side of the carbon-based film to form a second solution crystal of fluoropolymer. S4, using a laser device to process the region containing the second solution crystal on the back of the carbon-based thin film to form a hydrophobic graphene electrode, and connecting a second wire at the hydrophobic graphene electrode to form a triboelectric nanogenerator that collects droplet energy, consisting of the carbon-based thin film, the hydrophilic graphene electrode, the hydrophobic graphene electrode, the first wire, and the second wire. S5, the triboelectric nanogenerator for collecting droplet energy is moistened, and the moistened triboelectric nanogenerator for collecting droplet energy is wrapped around a shaping rod, and the triboelectric nanogenerator for collecting droplet energy wrapped around the shaping rod is heated to form a curled droplet energy collecting device. S6, The droplet energy harvesting device is installed on the solar energy harvesting module to form a triboelectric nanogenerator for multi-scenario energy harvesting.

2. The fabrication method of a triboelectric nanogenerator for multi-scenario energy harvesting according to claim 1, characterized in that, The formation of the first solution crystal in S1 includes the following steps: heating the hydroxide ion-containing solution at a constant temperature of 60 degrees Celsius for 30 minutes to evaporate and crystallize the water in the hydroxide ion-containing solution to form the first solution crystal.

3. The fabrication method of a triboelectric nanogenerator for multi-scenario energy harvesting according to claim 2, characterized in that, The carbon-based film has a thickness of 50 μm, and the carbon-based film is any one of polyimide film, polyetherimide film, and polyaniline film; the hydroxide ion-containing solution is any one of potassium hydroxide solution, sodium hydroxide, and barium hydroxide, and the potassium hydroxide solution has a thickness of 100 μm on the surface of the polyimide film.

4. The fabrication method of a triboelectric nanogenerator for multi-scenario energy harvesting according to claim 1, characterized in that, The laser device has a laser wavelength of 340nm-360nm, a laser power of 1W-5W, and a pulse width of 10ps.

5. The fabrication method of a triboelectric nanogenerator for multi-scenario energy harvesting according to claim 1, characterized in that, The formation of the second solution crystal in S3 includes the following steps: heating the fluoropolymer solution at a constant temperature of 50 degrees Celsius for 30 minutes to solidify the fluoropolymer solution and form the second solution crystal.

6. The fabrication method of a triboelectric nanogenerator for multi-scenario energy harvesting according to claim 5, characterized in that, The fluoropolymer solution is any one of polytetrafluoroethylene solution, perfluoroallyl ether solution, polyvinyl fluoride solution, and polyvinyl fluoride solution.

7. A triboelectric nanogenerator for multi-scenario energy harvesting, characterized in that, The triboelectric nanogenerator for multi-scenario energy harvesting is fabricated by the processing method of the triboelectric nanogenerator for multi-scenario energy harvesting according to any one of claims 1-6; the triboelectric nanogenerator for multi-scenario energy harvesting includes a solar energy harvesting module and a droplet energy harvesting device installed on the solar energy harvesting module; the droplet energy harvesting device includes a carbon-based thin film, a hydrophilic graphene electrode formed on the front side of the carbon-based thin film, a hydrophobic graphene electrode formed on the back side of the carbon-based thin film, a first wire connected to the hydrophilic graphene electrode, and a second wire connected to the hydrophobic graphene electrode.

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