Nested composite triboelectric nanogenerator

Abstract

The application provides a nested composite friction nanogenerator, a plurality of friction discs are embedded outside a liquid-solid friction nanogenerator tube core, and the friction discs are placed in a box as a whole; on the one hand, for the liquid-solid friction part, through the multi-tube nested structure, the liquid movement path is optimized, the effective friction area is increased, and thus the energy conversion efficiency is improved; on the other hand, the application adopts a 3D printing box + disc support design as a whole, a double friction generator mechanism is introduced, under the wave driving, the disc is driven to reciprocate by the power generation tube core, and thus the solid-solid friction power generation of the outer edge is utilized, and efficient and stable energy collection in each direction is realized; the application can effectively improve the power generation efficiency, is suitable for low-power application scenes such as a buoy, an offshore monitoring device and an ocean-going miniature device, conforms to the green energy development direction, and has a wide application prospect.

Description

Technical Field

[0001] This invention relates to the field of wave energy generation technology, and more specifically, to a nested composite triboelectric nanogenerator. Background Technology

[0002] Developing efficient and clean renewable energy technologies has become a global research focus. Ocean wave energy, as a renewable energy source with abundant reserves and wide distribution, is poised to play a crucial role in the future energy mix due to its independence from diurnal, seasonal, and weather variations. However, traditional wave energy harvesting technologies primarily rely on electromagnetic induction, hydraulic mechanical devices, or float-based power generation systems. These technologies suffer from complex structures, high maintenance costs, and low energy conversion efficiency, limiting their widespread adoption in large-scale ocean energy applications.

[0003] In recent years, triboelectric nanogenerators (TENGs) have become a research hotspot in marine wave energy harvesting technology due to their high power density, lightweight, low cost, and environmental friendliness. The basic principle of TENGs is based on the triboelectric effect and electrostatic induction, achieving efficient conversion of mechanical energy into electrical energy through periodic contact and separation or relative sliding. Liquid-solid triboelectric nanogenerators (LS TENGs) are an important type of TENG. They utilize the dynamic contact and separation between liquid and solid surfaces to drive charge transfer between electrodes, thereby achieving energy harvesting. Compared to traditional solid-solid triboelectric TENGs, liquid-solid TENGs exhibit stronger corrosion resistance, more stable output performance, and longer service life in marine environments.

[0004] Currently, liquid-solid TENGs have been studied to some extent in wave energy harvesting, mainly employing single-tube structures or contact-separation modes for power generation. For example, some researchers utilize the reciprocating flow of liquid in a pipe to harvest energy through the triboelectric effect of the pipe wall, or utilize the periodic contact and separation of the solid surface driven by waves to generate charge. However, these methods have the following problems: 1) Limited energy conversion efficiency of single-tube structures: Due to the limited contact area of ​​a single pipe, the amount of charge generated is small, resulting in limited energy harvesting capacity per unit volume. 2) Poor stability of contact-separation modes: Traditional contact-separation TENGs are easily affected by external disturbances in ocean wave environments, such as wind and wave changes and sediment effects, leading to unstable charge accumulation and large fluctuations in output power. 3) Lack of structural optimization and failure to fully utilize the internal space: Existing designs usually adopt single-layer or simple contact methods, failing to utilize multi-layer nested pipe structures to improve power generation efficiency and charge storage capacity. 4) Single energy capture direction: Traditional tubular structures can only capture wave energy in the axial direction, making it difficult to capture radial energy, resulting in low energy utilization. Summary of the Invention

[0005] To overcome the shortcomings of low power generation efficiency and low space utilization in the prior art, this invention provides a nested composite triboelectric nanogenerator that combines liquid-solid friction mode and solid-solid friction mode to achieve dual triboelectric power generation under wave drive, thereby improving power generation efficiency. This invention has broad application prospects in wave energy harvesting, self-powered marine sensors, smart buoys and other fields.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0007] A nested composite triboelectric nanogenerator includes: a housing, a liquid-solid triboelectric nanogenerator core, and several triboelectric disks;

[0008] The box body includes an upper box body and a lower box body with symmetrical structure. The upper box body and the lower box body are provided with a number of protrusions inside. Each of the protrusions is provided with a protrusion sensing electrode on two sides. The protrusion sensing electrode is covered with a first polymer material.

[0009] The liquid-solid triboelectric nano-power generation core is horizontally arranged on the protrusion of the lower box and can roll back and forth inside the box.

[0010] Each of the friction disks is nested outside the liquid-solid triboelectric nanotube core and embedded in a groove formed by adjacent protrusions; two symmetrical and non-contact disk sensing electrodes are respectively provided on two sides of each friction disk, and the disk sensing electrodes are covered with a second polymer material;

[0011] The first polymer material and the second polymer material have opposite polarities;

[0012] Under the influence of wave energy, when the box moves laterally, the liquid-solid triboelectric nanotube generates electricity through liquid-solid triboelectricity; when the box moves longitudinally, the liquid-solid triboelectric nanotube rolls back and forth within the box, simultaneously driving the friction disk to roll back and forth within the groove, and causing the second polymer material to generate electricity through solid-solid triboelectricity with the first polymer material; when the box moves vertically, the liquid-solid triboelectric nanotube and the friction disk move up and down, and cause the second polymer material to generate electricity through solid-solid triboelectricity with the first polymer material.

[0013] Preferably, the liquid-solid triboelectric nanotube includes: an outer tube, a first inner tube, a second inner tube, a triboelectric liquid, an external sensing electrode, a first internal sensing electrode, and a second internal sensing electrode;

[0014] The outer tube, the first inner tube, and the second inner tube are nested in sequence from the outside to the inside;

[0015] The friction fluid is disposed in the space between the outer tube and the first inner tube, and inside the second inner tube;

[0016] The external sensing electrode is disposed on the outer wall of the outer tube, the first internal sensing electrode is disposed on the inner wall of the first inner tube, and the second internal sensing electrode is disposed on the outer wall of the second inner tube.

[0017] When the box moves laterally, the friction liquid rubs against the inner wall of the outer tube, the outer wall of the first inner tube, and the inner wall of the second inner tube, generating charge transfer. Induced charges are generated on the external induction electrode, the first internal induction electrode, and the second internal induction electrode, respectively. The induced charges are led out through the external wire to generate alternating current, thus realizing liquid-solid triboelectric power generation.

[0018] Preferably, the outer tube, the first inner tube, and the second inner tube are all made of insulating materials, and the insulating materials include any one of PTFE, PE, PP, PET, PDMS, and PVC.

[0019] Preferably, the protruding sensing electrode, the disk sensing electrode, the external sensing electrode, the first internal sensing electrode, and the second internal sensing electrode are all made of conductive materials, including any one of copper foil, aluminum foil, and conductive coating.

[0020] Preferably, the friction fluid is deionized water, magnetic fluid, or aqueous solution.

[0021] Preferably, the volume of the friction fluid in the interval is less than or equal to half the volume of the interval between the outer tube and the first inner tube;

[0022] The volume of the friction fluid inside the second inner tube is less than or equal to one-half of the internal volume of the second inner tube.

[0023] Preferably, the first polymer material is nylon; the second polymer material is any one of PTFE, FEP and PI.

[0024] Preferably, the material of the friction disk is any one of acrylic, polyvinyl chloride, and polyphenylene ether.

[0025] Preferably, the upper box, lower box, and protrusion are manufactured using 3D printing technology.

[0026] Preferably, the longitudinal length of the box body is the same as the circumference of the friction disk, and the vertical height is greater than the diameter of the friction disk.

[0027] Compared with the prior art, the beneficial effects of the technical solution of the present invention are:

[0028] This invention provides a nested composite triboelectric nanogenerator. On one hand, for the liquid-solid friction part, the multi-tube nested structure optimizes the liquid movement path and increases the effective friction area, thereby improving energy conversion efficiency. On the other hand, the invention adopts a 3D-printed box body + disk support design and introduces a dual triboelectric generation mechanism. Under wave drive, the power generation core drives the disk to reciprocate, thereby utilizing the solid-solid friction of the outer edge to generate electricity, achieving efficient and stable energy collection in all directions. This invention can effectively improve power generation efficiency and is suitable for low-power applications such as buoys, offshore monitoring equipment, and ocean-going micro-devices. It conforms to the development direction of green energy and has broad application prospects. Attached Figure Description

[0029] Figure 1 This is a front view of a nested composite triboelectric nanogenerator provided in Example 1.

[0030] Figure 2 This is a left view of a nested composite triboelectric nanogenerator provided in Example 1.

[0031] Figure 3 This is a front view of the box 1 provided in Example 1.

[0032] Figure 4 This is a front view of the friction disk 3 provided in Example 1.

[0033] Figure 5 This is a three-dimensional cross-sectional view of the liquid-solid triboelectric nanotube chip 2 provided in Example 2.

[0034] Figure 6 This is a front view of the liquid-solid triboelectric nanotube chip 2 provided in Example 2.

[0035] Figure 7 This is a left view of the liquid-solid triboelectric nanotube chip 2 provided in Example 2.

[0036] Figure 8 This is an overall view of the liquid-solid triboelectric nanotube core 2 with eight triboelectric disks 3 embedded on the outside, as provided in Example 2.

[0037] Figure 9 The output voltage and current performance diagram of the liquid-solid triboelectric nanogenerator chip 2 provided in Example 2 is shown.

[0038] Figure 10 The output voltage and current performance diagram of the solid-solid friction between the housing 1 and the friction disk 3 provided in Example 2 is shown.

[0039] 1-Box body; 11-Upper box body; 12-Lower box body; 13-Protrusion; 14-Protrusion sensing electrode; 15-First polymer material; 2-Liquid-solid triboelectric nanogenerator core; 21-Outer tube; 22-First inner tube; 23-Second inner tube; 24-Friction liquid; 25-External sensing electrode; 26-First internal sensing electrode; 27-Second internal sensing electrode; 3-Friction disk; 31-Disk sensing electrode; 32-Second polymer material. Detailed Implementation

[0040] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this application.

[0041] To better illustrate this embodiment, some parts in the accompanying drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions;

[0042] It is understandable to those skilled in the art that certain well-known structures and their descriptions may be omitted in the accompanying drawings.

[0043] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0044] Example 1

[0045] like Figure 1 As shown, this embodiment provides a nested composite triboelectric nanogenerator, including: a housing 1, a liquid-solid triboelectric nanogenerator core 2, and several triboelectric disks 3;

[0046] The box 1 includes an upper box 11 and a lower box 12 with symmetrical structure. The upper box 11 and the lower box 12 are provided with a plurality of protrusions 13 inside. Each of the protrusions 13 is provided with a protrusion sensing electrode 14 on two sides, and the protrusion sensing electrode 14 is covered with a first polymer material 15.

[0047] The liquid-solid triboelectric nano-power generation core 2 is laterally arranged on the protrusion 13 of the lower housing 12 and can roll back and forth inside the housing 1.

[0048] Each of the friction disks 3 is nested outside the liquid-solid triboelectric nanotube core 2 and is embedded in a groove formed by adjacent protrusions 13; each of the friction disks 3 has two symmetrical and non-contact disk sensing electrodes 31 on its two sides, and the disk sensing electrodes 31 are covered with a second polymer material 32.

[0049] The first polymer material 15 and the second polymer material 32 have opposite polarities;

[0050] Under the influence of wave energy, when the box 1 moves laterally, the liquid-solid triboelectric nanotube 2 generates electricity through liquid-solid triboelectricity; when the box 1 moves longitudinally, the liquid-solid triboelectric nanotube 2 rolls back and forth inside the box 1, simultaneously driving the friction disk 3 to roll back and forth in the groove, and causing the second polymer material 32 to generate electricity through solid-solid triboelectricity with the first polymer material 15; when the box 1 moves vertically, the liquid-solid triboelectric nanotube 2 and the friction disk 3 move up and down, and causing the second polymer material 32 to generate electricity through solid-solid triboelectricity with the first polymer material 15.

[0051] In the specific implementation process, such as Figure 2 The image shown is a left view of the nested composite triboelectric nanogenerator provided in this embodiment.

[0052] like Figure 3 As shown, the box 1 includes a symmetrical upper box 11 and a lower box 12. The upper box 11 and the lower box 12 are provided with a number of protrusions 13. The protrusions 13 are used to support the liquid-solid triboelectric nanogenerator chip 2 on the one hand, and to form grooves to accommodate the triboelectric disk 3 on the other hand. In this embodiment, the spacing between two adjacent protrusions 13 can be flexibly adjusted as needed. In addition, each protrusion 13 is provided with a protrusion sensing electrode 14 on two sides, and the protrusion sensing electrode 14 is covered with a first polymer material 15.

[0053] like Figure 4 As shown, each friction disk 3 has a circular hole in the center for nesting on the outside of the liquid-solid triboelectric nanotube core 2. At the same time, each friction disk 3 is embedded in a groove formed by adjacent protrusions 13. Two symmetrical and non-contact disk sensing electrodes 31 are respectively provided on the two sides of each friction disk 3. The disk sensing electrodes 31 are covered with a second polymer material 32.

[0054] In this embodiment, the first polymer material 15 and the second polymer material 32 are materials with opposite polarities. They can generate charge transfer by rubbing against each other. After the charge is drawn out by the corresponding induction motor, solid-solid triboelectric power generation is realized. At the same time, the liquid-solid triboelectric nano-power generation chip 2 can generate liquid-solid triboelectric power when it swings left and right.

[0055] The generator in this embodiment can achieve dual triboelectric power generation and can collect wave energy in all directions, including up, down, left, right, and front and back. The specific power generation process is as follows:

[0056] Under the influence of wave energy, when the box 1 moves horizontally (left and right) back and forth, the liquid-solid triboelectric nano-power generation core 2 swings left and right, and liquid-solid triboelectric power generation is carried out at this time.

[0057] When the box 1 moves longitudinally (back and forth), the liquid-solid triboelectric nanogenerator core 2 rolls back and forth inside the box 1, while driving the friction disk 3 to roll back and forth in the groove, and causing the second polymer material 32 to rub against the first polymer material 15. The generated charge is discharged through the protruding induction electrode 14 and the disk induction electrode 31, realizing solid-solid triboelectric power generation.

[0058] When the box 1 moves vertically (up and down) back and forth, the liquid-solid triboelectric nanogenerator core 2 and the triboelectric disk 3 move up and down, causing the second polymer material 32 to rub against the first polymer material 15. The generated charge is discharged through the protruding sensing electrode 14 and the disk sensing electrode 31, thus realizing solid-solid triboelectric power generation.

[0059] The generator provided in this embodiment features a multi-slot housing, which helps improve contact separation stability and enhances power generation efficiency. At the same time, a liquid-solid friction TENG is embedded in the central axis of the solid-solid TENG, utilizing the wave-driven oscillation effect to further improve the energy collection capability in different directions and realize a dual friction power generation mode.

[0060] Example 2

[0061] This embodiment provides a nested composite triboelectric nanogenerator, including: a housing 1, a liquid-solid triboelectric nanogenerator core 2, and several triboelectric disks 3;

[0062] The box 1 includes an upper box 11 and a lower box 12 with symmetrical structure. The upper box 11 and the lower box 12 are provided with a plurality of protrusions 13 inside. Each of the protrusions 13 is provided with a protrusion sensing electrode 14 on two sides, and the protrusion sensing electrode 14 is covered with a first polymer material 15.

[0063] The liquid-solid triboelectric nano-power generation core 2 is laterally arranged on the protrusion 13 of the lower housing 12 and can roll back and forth inside the housing 1.

[0064] Each of the friction disks 3 is nested outside the liquid-solid triboelectric nanotube core 2 and is embedded in a groove formed by adjacent protrusions 13; each of the friction disks 3 has two symmetrical and non-contact disk sensing electrodes 31 on its two sides, and the disk sensing electrodes 31 are covered with a second polymer material 32.

[0065] The first polymer material 15 and the second polymer material 32 have opposite polarities;

[0066] Under the influence of wave energy, when the box 1 moves laterally, the liquid-solid triboelectric nanotube core 2 generates electricity through liquid-solid triboelectricity; when the box 1 moves longitudinally, the liquid-solid triboelectric nanotube core 2 rolls back and forth inside the box 1, simultaneously driving the friction disk 3 to roll back and forth in the groove, and causing the second polymer material 32 to generate electricity through solid-solid triboelectricity with the first polymer material 15; when the box 1 moves vertically, the liquid-solid triboelectric nanotube core 2 and the friction disk 3 move up and down, and causing the second polymer material 32 to generate electricity through solid-solid triboelectricity with the first polymer material 15.

[0067] The liquid-solid triboelectric nanotube core 2 includes: an outer tube 21, a first inner tube 22, a second inner tube 23, a triboelectric liquid 24, an external sensing electrode 25, a first internal sensing electrode 26, and a second internal sensing electrode 27.

[0068] The outer tube 21, the first inner tube 22, and the second inner tube 23 are nested in sequence from the outside to the inside;

[0069] The friction fluid 24 is disposed in the gap between the outer tube 21 and the first inner tube 22, and inside the second inner tube 23;

[0070] The external sensing electrode 25 is disposed on the outer wall of the outer tube 21, the first internal sensing electrode 26 is disposed on the inner wall of the first inner tube 22, and the second internal sensing electrode 27 is disposed on the outer wall of the second inner tube 23.

[0071] When the box 1 moves laterally back and forth, the friction liquid 24 rubs against the inner wall of the outer tube 21, the outer wall of the first inner tube 22, and the inner wall of the second inner tube 23 to generate charge transfer, and induces charges on the external induction electrode 25, the first internal induction electrode 26, and the second internal induction electrode 27 respectively. The induced charges are led out through the external wire to generate alternating current, thus realizing liquid-solid triboelectric power generation.

[0072] The outer tube 21, the first inner tube 22, and the second inner tube 23 are all made of insulating material. The insulating material includes any one of PTFE, PE, PP, PET, PDMS, and PVC. In this embodiment, it is PTFE.

[0073] The protruding sensing electrode 14, the disk sensing electrode 31, the external sensing electrode 25, the first internal sensing electrode 26, and the second internal sensing electrode 27 are all made of conductive materials. The conductive materials include any one of copper foil, aluminum foil, and conductive coating. In this embodiment, it is copper foil.

[0074] The friction fluid 24 is specifically deionized water, magnetic fluid, or aqueous solution; in this embodiment, it is deionized water.

[0075] The volume of the friction fluid 24 in the interval is less than or equal to half the volume of the interval between the outer tube 21 and the first inner tube 22;

[0076] The volume of the friction fluid 24 inside the second inner tube 23 is less than or equal to one-half of the internal volume of the second inner tube 23;

[0077] The first polymer material 15 is specifically nylon; the second polymer material 32 is specifically any one of PTFE, FEP and PI, and in this embodiment it is PTFE;

[0078] The friction disk 3 is made of any one of acrylic, polyvinyl chloride and polyphenylene ether, and in this embodiment it is acrylic.

[0079] The upper box 11, lower box 12 and protrusion 13 are made based on 3D printing technology;

[0080] The longitudinal length of the box 1 is the same as the circumference of the friction disk 3, and the vertical height is greater than the diameter of the friction disk 3.

[0081] In the specific implementation process, in this embodiment, the box 1 is made by 3D printing, with a length of 28.27cm (the diameter of the friction disk 3 is 9cm, and the circumference is the same as the length of the box 1) and a height of 10cm;

[0082] Box 1 is composed of two half-boxes joined together. The left and right ends of each half-box are 5cm high. The interior has multiple 1cm wide grooves, and there is a 1cm wide protrusion 13 between adjacent grooves. The grooves are 3cm high. The protrusion 13 is used to fix the liquid-solid triboelectric nano-power generation core 2, and the grooves are used to accommodate the triboelectric disc 3. In this embodiment, one half-box has stretching at the four corners, and the other half has female holes to form a letter interface for fixing and splicing. After the two boxes are spliced ​​together, a structure with a height of 10cm can be formed. Finally, a layer of copper foil (i.e., the protrusion sensing electrode 14) is first attached to the two sides of each protrusion 13, and then a nylon film (i.e., the first polymer material 15) is attached to ensure the stability of the friction area.

[0083] In this embodiment, as Figures 5-7 The figures shown are a three-dimensional cross-sectional view, a front view, and a left view of the liquid-solid triboelectric nanogenerator core 2. Its structure includes: an outer tube 21, a first inner tube 22, a second inner tube 23, a triboelectric liquid 24, an external sensing electrode 25, a first internal sensing electrode 26, and a second internal sensing electrode 27.

[0084] The outer tube 21, the first inner tube 22, and the second inner tube 23 are nested in sequence from the outside to the inside; the friction fluid 24 is disposed in the interval between the outer tube 21 and the first inner tube 22, and inside the second inner tube 23; the external sensing electrode 25 is disposed on the outer wall of the outer tube 21, the first internal sensing electrode 26 is disposed on the inner wall of the first inner tube 22, and the second internal sensing electrode 27 is disposed on the outer wall of the second inner tube 23.

[0085] To ensure optimal power generation performance, the wall thicknesses of the outer tube 21, the first inner tube 22, and the second inner tube 23 in this embodiment are basically the same; at the same time, the cavity volume within the gap between the outer tube 21 and the first inner tube 22 is the same as the cavity volume inside the second inner tube 23. Its power generation principle includes the following three parts:

[0086] 1) The positive and negative electrodes of the external sensing electrode 25 are respectively disposed on the outer wall of the outer tube 21 without contact. When the liquid-solid triboelectric nano-power generation core 2 moves back and forth along the axial direction of the outer tube 21, the triboelectric liquid 24 in the gap between the outer tube 21 and the first inner tube 22 rubs against the inner wall of the outer tube 21, generating charge transfer and inducing the opposite charge on the external sensing electrode 25, which is finally led out through the external wire.

[0087] 2) The positive and negative electrodes of the first internal sensing electrode 26 are respectively disposed on the inner wall of the first inner tube 22 without contact. When the liquid-solid triboelectric nano-power generation core 2 moves back and forth along the axial direction of the outer tube 21, the triboelectric liquid 24 in the gap between the outer tube 21 and the first inner tube 22 rubs against the outer wall of the first inner tube 22, generating charge transfer and inducing the opposite charge on the first internal sensing electrode 26, which is finally led out through the external wire.

[0088] 3) The positive and negative electrodes of the second internal sensing electrode 27 are respectively disposed on the outer wall of the second inner tube 23 without contact. When the liquid-solid triboelectric nano-power generation core 2 moves back and forth along the axial direction of the outer tube 21, the triboelectric liquid 24 inside the second inner tube 23 rubs against the inner wall of the second inner tube 23, generating charge transfer and inducing the opposite charge on the second internal sensing electrode 27, which is finally led out through the external wire.

[0089] In this embodiment, the liquid-solid triboelectric nanogenerator chip 2 is provided with three sets of liquid-solid triboelectric contact surfaces. Friction generates charge transfer, which in turn induces opposite charges on the corresponding electrodes and leads them out through wires connected to the three sets of electrodes, ultimately outputting alternating current.

[0090] In this embodiment, the friction disk 3 is a circular plate with a diameter of 9cm and a 30mm circular hole in the center (for installing the coaxial liquid-solid triboelectric nano-power generation core 2). After fixing the liquid-solid triboelectric nano-power generation core 2 in the circular hole, it is made to swing under the push of waves to realize the triboelectric power generation at the liquid-solid interface. Copper foil electrodes are attached to the outer edge of the friction disk 3 to collect charges, and then a layer of PTFE film is attached. Under the vertical rise and fall and back and forth reciprocating motion of the waves, it is used for solid-solid triboelectric power generation.

[0091] like Figure 8 As shown, in this embodiment, eight friction disks 3 are embedded on the outside of the liquid-solid triboelectric nanotube core 2, and the core is placed as a whole into a 3D-printed box 1. When the box 1 swings back and forth with the waves, it can push the friction disks 3 to roll back and forth, thus generating solid-solid triboelectric power. When the box 1 swings left and right, it can push the liquid-solid triboelectric nanotube core 2 to generate liquid-solid triboelectric power. When the box 1 swings up and down, it can drive the friction disks 3 to move up and down in the groove, thus generating solid-solid triboelectric power.

[0092] During solid-solid friction, nylon films readily gain electrons and become positively charged, while PTFE readily loses electrons and becomes negatively charged. This heterogeneous combination of materials further enhances the output voltage and power density, enabling efficient charge transfer.

[0093] In this embodiment, the design length of the box 1 matches the circumference of the friction disk 3, which ensures that multiple friction disks 3 can periodically contact the box 1 when the wave pushes, realizing multi-point solid-solid triboelectric power generation; at the same time, the liquid-solid triboelectric nano-power generation core 2 moves through the central axis, forming a continuous charge transfer during the swaying; the power generation groove design inside the box 1 can be 3D printed in different models according to requirements.

[0094] In this embodiment, a 0.5Hz wave condition was simulated on a six-degree-of-freedom vibration table, and power generation tests were conducted on the two modules respectively. Figure 9 The maximum open-circuit voltage of the central liquid-solid triboelectric nanotube chip 2 is 173.79V, and the short-circuit current is 433.3nA; Figure 10 As shown, the open-circuit voltage of the solid-solid triboelectric nanogenerator generated by the 3D-printed box 1 and the triboelectric disk 3 is 288.43V, and the short-circuit current is 2991.23nA. It can be seen that the composite generator provided in this embodiment can effectively improve the power generation efficiency, is suitable for low-power application scenarios such as buoys and offshore monitoring equipment, is suitable for powering micro-equipment in the ocean, and is in line with the development direction of green energy.

[0095] The same or similar labels correspond to the same or similar parts;

[0096] The terms used to describe positional relationships in the accompanying drawings are for illustrative purposes only and should not be construed as limiting this application.

[0097] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A nested composite triboelectric nanogenerator, characterized in that, include: The box body (1), the liquid-solid triboelectric nanogenerator core (2) and several triboelectric disks (3); The box body (1) includes an upper box body (11) and a lower box body (12) with symmetrical structure. The upper box body (11) and the lower box body (12) are provided with a number of protrusions (13). Each of the protrusions (13) has a protrusion sensing electrode (14) on two sides, and the protrusion sensing electrode (14) is covered with a first polymer material (15). The liquid-solid triboelectric nano-power generation core (2) is arranged laterally on the protrusion (13) of the lower box (12) and can roll back and forth inside the box (1); Each of the friction disks (3) is nested outside the liquid-solid triboelectric nanotube core (2) and embedded in a groove formed by adjacent protrusions (13); each of the friction disks (3) has two symmetrical and non-contact disk sensing electrodes (31) on its two sides, and the disk sensing electrodes (31) are covered with a second polymer material (32). The first polymer material (15) and the second polymer material (32) have opposite polarities; the first polymer material (15) is specifically nylon; the second polymer material (32) is specifically any one of PTFE, FEP and PI; Under the influence of wave energy, when the box (1) moves laterally, the liquid-solid friction nano-power generation core (2) generates electricity through liquid-solid friction; when the box (1) moves longitudinally, the liquid-solid friction nano-power generation core (2) rolls back and forth inside the box (1), while simultaneously driving the friction disk (3) to roll back and forth inside the groove, and causing the second polymer material (32) to generate electricity through solid-solid friction with the first polymer material (15); when the box (1) moves vertically, the liquid-solid friction nano-power generation core (2) and the friction disk (3) move up and down, and cause the second polymer material (32) to generate electricity through solid-solid friction with the first polymer material (15). The longitudinal length of the box (1) is the same as the circumference of the friction disk (3), and the vertical height is greater than the diameter of the friction disk (3).

2. The nested composite triboelectric nanogenerator according to claim 1, characterized in that, The liquid-solid triboelectric nano-power generation core (2) includes: an outer tube (21), a first inner tube (22), a second inner tube (23), a triboelectric liquid (24), an external sensing electrode (25), a first internal sensing electrode (26), and a second internal sensing electrode (27). The outer tube (21), the first inner tube (22), and the second inner tube (23) are nested sequentially from the outside to the inside; The friction fluid (24) is disposed in the space between the outer tube (21) and the first inner tube (22), and inside the second inner tube (23); The external sensing electrode (25) is disposed on the outer wall of the outer tube (21), the first internal sensing electrode (26) is disposed on the inner wall of the first inner tube (22), and the second internal sensing electrode (27) is disposed on the outer wall of the second inner tube (23). When the box (1) moves laterally back and forth, the friction liquid (24) rubs against the inner wall of the outer tube (21), the outer wall of the first inner tube (22), and the inner wall of the second inner tube (23) to generate charge transfer, and induces charge on the outer induction electrode (25), the first internal induction electrode (26), and the second internal induction electrode (27), respectively. The induced charge is led out through the external wire to generate alternating current, thus realizing liquid-solid triboelectric power generation.

3. The nested composite triboelectric nanogenerator according to claim 2, characterized in that, The outer tube (21), the first inner tube (22), and the second inner tube (23) are all made of insulating materials, including any one of PTFE, PE, PP, PET, PDMS, and PVC.

4. A nested composite triboelectric nanogenerator according to claim 2, characterized in that, The protruding sensing electrode (14), the disk sensing electrode (31), the external sensing electrode (25), the first internal sensing electrode (26), and the second internal sensing electrode (27) are all made of conductive materials, including any one of copper foil, aluminum foil, and conductive coating.

5. A nested composite triboelectric nanogenerator according to claim 2, characterized in that, The friction fluid (24) is specifically deionized water, magnetic fluid, or aqueous solution.

6. A nested composite triboelectric nanogenerator according to claim 2, characterized in that, The volume of the friction fluid (24) in the interval is less than or equal to half the volume of the interval between the outer tube (21) and the first inner tube (22); The volume of the friction fluid (24) inside the second inner tube (23) is less than or equal to half the internal volume of the second inner tube (23).

7. A nested composite triboelectric nanogenerator according to claim 1, characterized in that, The material of the friction disk (3) is any one of acrylic, polyvinyl chloride and polyphenylene ether.

8. A nested composite triboelectric nanogenerator according to claim 1, characterized in that, The upper box (11), lower box (12) and protrusion (13) are made using 3D printing technology.

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