CN113630040A - Flexible piezoelectric energy collection system based on graphene assembly film - Google Patents
Flexible piezoelectric energy collection system based on graphene assembly film Download PDFInfo
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- CN113630040A CN113630040A CN202110920245.6A CN202110920245A CN113630040A CN 113630040 A CN113630040 A CN 113630040A CN 202110920245 A CN202110920245 A CN 202110920245A CN 113630040 A CN113630040 A CN 113630040A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 68
- 239000000758 substrate Substances 0.000 claims abstract description 12
- 238000004146 energy storage Methods 0.000 claims abstract description 11
- 238000003306 harvesting Methods 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims description 20
- 239000003990 capacitor Substances 0.000 claims description 6
- 229920000642 polymer Polymers 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 3
- 239000002033 PVDF binder Substances 0.000 claims description 2
- 230000010287 polarization Effects 0.000 claims description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 2
- 238000010248 power generation Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
- H02N2/181—Circuits; Control arrangements or methods
Abstract
The invention relates to a flexible piezoelectric energy collecting system based on a graphene assembly film, which comprises a flexible piezoelectric energy collector based on the graphene assembly film and a piezoelectric energy collecting circuit; the flexible piezoelectric energy collector based on the graphene assembly film comprises a piezoelectric power generation unit and a flexible substrate, wherein the piezoelectric power generation unit is formed by stacking macroscopic graphene films and flexible piezoelectric films in a staggered mode; the piezoelectric energy harvesting circuit comprises a rectifier bridge and an energy storage element. The flexible piezoelectric energy collection system based on the graphene assembly film utilizes the special high conductivity and negative Poisson ratio effect of the graphene assembly film, and is beneficial to obtaining high energy collection efficiency; meanwhile, the piezoelectric energy collecting system has good flexibility, can stably work for a long time under different frequencies, and is suitable for being applied to wearable electronic equipment.
Description
Technical Field
The invention relates to the technical field of piezoelectric energy collection, in particular to a flexible piezoelectric energy collection system based on a graphene assembly film.
Background
The piezoelectric effect means that a material, called a piezoelectric material, which is capable of separating positive charges and negative charges and generating a pressure difference when subjected to a mechanical force, is stretched or pressed to generate a voltage, so that the piezoelectric material can convert mechanical energy into electrical energy. Piezoelectric materials are one of the most ideal new energy materials at present, and the combination of flexible materials and traditional piezoelectric materials can realize that the piezoelectric materials generate voltage/current when being subjected to large-amplitude bending or pulling. The piezoelectric energy collector can stably and efficiently convert complex and variable mechanical energy in the environment into electric energy for utilization based on the piezoelectric effect principle of materials. Compared with other forms of environmental mechanical energy collection technologies, such as electrostatic type, electromagnetic induction type, triboelectric type and the like, piezoelectric type energy collection has the advantages of simple and compact device structure, high energy conversion efficiency, good electric energy output stability, easiness in flexibility, easiness in integration with electronic devices and the like. Along with scientific and technological progress, wearable area intelligence electronic product has wide market prospect, and the flexible piezoelectric type current collector that adapts to wearable equipment also shows huge development potential.
At present, the electrical output performance of most flexible piezoelectric energy collecting devices is still low, and the energy consumption requirements of most electronic equipment cannot be met, one of the reasons is that the mechanical structure of the devices is not optimal, and the performance of piezoelectric materials is not fully utilized. In addition to optimizing the performance of the piezoelectric material, the design and optimization of the topological configuration of the piezoelectric current collector are also effective ways for improving the electrical output performance of the flexible piezoelectric energy collecting device. The piezoelectric power generation device outputs alternating current related to external excitation, so that the electronic device is not convenient to be directly powered, and therefore, the piezoelectric power generation device needs to be integrated with a rectifying circuit and an energy storage element to form a piezoelectric energy collection system so as to realize stable and continuous electric output. For a piezoelectric power generation device of negative poisson ratio graphene, no system exists at present, and practical application is hindered.
A negative poisson's ratio material is a more exotic material that expands laterally when subjected to uniaxial tension. Based on this property, piezoelectric materials can be combined with negative poisson's ratio materials such that the material deforms to a greater extent when under tension than typical materials. The negative Poisson ratio effect of the material is reasonably utilized to improve the performance of the piezoelectric device. The graphene is applied to the flexible piezoelectric energy collector, and the negative Poisson ratio structure design is carried out on the graphene assembly film, so that the integral Young modulus and Poisson ratio are changed, the electric output performance of the piezoelectric energy collector is improved, and the graphene assembly film has great significance for developing the high-performance flexible piezoelectric energy collector and promoting the application of the high-performance flexible piezoelectric energy collector in wearable electronics.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a flexible piezoelectric energy collection system based on a graphene assembly film.
In order to achieve the purpose, the invention adopts the following technical scheme:
the flexible piezoelectric energy collecting system based on the graphene assembly film is characterized by comprising a flexible piezoelectric energy collector based on the graphene assembly film and a piezoelectric energy collecting circuit, wherein the flexible piezoelectric energy collector based on the graphene assembly film comprises a piezoelectric power generation unit and a flexible substrate, and the piezoelectric energy collecting circuit comprises a rectifying circuit and an energy storage element.
Further, the piezoelectric power generation unit is formed by alternately laminating the graphene assembly film and the flexible piezoelectric film.
Further, the graphene assembly film is formed by stacking graphene sheet layers with micro-folds, the thickness of the graphene assembly film is 10-50 mu m, the in-plane apparent Poisson ratio of the graphene assembly film is a negative value, and the Young modulus of the graphene assembly film is 1-5 GPa.
Furthermore, the flexible piezoelectric film material is a piezoelectric polymer with PVDF as a main component, the thickness of the piezoelectric polymer is 10-50 mu m, and the piezoelectric polymer is subjected to full pre-polarization treatment.
Further, the flexible substrate is a PET sheet.
Further, the rectification circuit is a bridge rectification circuit.
Furthermore, the energy storage element is composed of a plurality of energy storage capacitors.
The invention has the beneficial effects that: the invention provides a flexible piezoelectric energy collecting system based on a graphene assembly film, which integrates a graphene-based flexible piezoelectric energy collecting device, an energy collecting circuit and an energy storage element to obtain stable and continuous electric output; in addition, the piezoelectric energy collection system utilizes the good conductivity, flexibility and specific negative Poisson ratio effect of the graphene assembly film, is favorable for obtaining high energy collection efficiency, can stably work for a long time under different frequencies, and is suitable for being applied to wearable electronic equipment.
Drawings
Fig. 1 is a schematic structural diagram of a principle of a flexible piezoelectric energy collection system based on a graphene assembly film according to the present invention;
fig. 2 is a piezoelectric energy harvesting device used in a flexible piezoelectric energy harvesting system based on a graphene assembly film according to an embodiment of the present invention;
FIG. 3 is a photomicrograph of a graphene assembled film according to example two of the present invention;
fig. 4 is a mechanical property test result of a graphene assembly film according to an embodiment of the present invention;
fig. 5 is a result of testing the load characteristics of the flexible piezoelectric energy collecting device based on the graphene assembly film according to the second embodiment of the present invention;
fig. 6 is an open-circuit voltage output waveform of a flexible piezoelectric energy collecting device based on a graphene assembly film under mechanical deformation at different frequencies according to a third embodiment of the present invention;
fig. 7 is a short-circuit current output waveform of a flexible piezoelectric energy collecting device based on a graphene assembly film under mechanical deformation at different frequencies according to a third embodiment of the present invention;
fig. 8 is an open-circuit voltage output waveform of a flexible piezoelectric energy collection device based on a graphene assembly film under the repeated action of mechanical deformation for a long time according to a third embodiment of the present invention;
fig. 9 is a short-circuit current output waveform of a flexible piezoelectric energy collecting device based on a graphene assembly film under the repeated action of mechanical deformation for a long time according to a third embodiment of the present invention;
icon: 1-flexible piezoelectric energy collector based on graphene assembled film; 2-a piezoelectric power harvesting circuit; 11-a graphene assembly film; 12-a flexible piezoelectric film; 13-a flexible substrate; 21-a rectifying circuit; 22-energy storage element.
Detailed Description
As shown in fig. 1, the piezoelectric energy harvesting system provided by the present invention includes a flexible piezoelectric energy harvester 1 based on a graphene assembly film and a piezoelectric energy harvesting circuit 2. The piezoelectric energy collector 1 comprises a graphene assembly film 11, a flexible piezoelectric film 12 and a flexible substrate 13, wherein the graphene assembly film 11 and the flexible piezoelectric film 12 are arranged in a staggered mode to form a piezoelectric unit fixed on the flexible substrate 13. The piezoelectric energy harvesting circuit 2 includes a rectifying circuit 21 and an energy storage element 22.
The first embodiment is as follows: the energy generated by the flexible piezoelectric energy harvester is used to illuminate the small bulb.
The piezoelectric energy collector shown in fig. 2 is fixed on a finger, the graphene film is driven to generate stretching deformation through the movement of the finger, the flexible piezoelectric film is caused to generate stretching deformation in the longitudinal direction and the transverse direction, and therefore voltage/current signal output is generated, is an alternating current signal and cannot directly supply power to an electric appliance.
Referring to fig. 1, a piezoelectric energy collector 1 is used as a power supply, a circuit is arranged according to a piezoelectric energy collecting circuit 2, a bridge rectifier circuit is used, four diodes are used for rectifying alternating current generated by a piezoelectric power generation unit, alternating current generated by the piezoelectric energy collector is converted into direct current, a 0.1uF capacitor is used as a filter capacitor, the rectified direct current is output more smoothly, a 0.22F capacitor is used for collecting energy generated by three layers of piezoelectric power generation units, and the capacitor is used as an electricity storage unit to provide energy for lighting of small bulbs. In the embodiment, the flexible piezoelectric energy collector can be fixed on any joint part of a human body, and has strong potential of wearable application.
Example two:
a flexible piezoelectric energy harvester with dimensions of 28 x 12mm and a piezoelectric film thickness of 20 microns was used. The graphene film is microscopically structured as shown in fig. 3, and is formed by stacking folded graphene sheets, so that the graphene film has good flexibility macroscopically. Mechanical property test is performed on the graphene film, fig. 4 shows the mechanical property test result of the graphene assembled film, under the condition that only one-side tensile stress is applied, longitudinal and transverse strains are positive, and the poisson ratio of the graphene assembled film is negative. As shown in fig. 5, the load characteristic test of the graphene assembly film indicates that the graphene assembly film is an optimal load when the load is 200M Ω, and the maximum output power is about 0.0000003 w.
Example three: a flexible piezoelectric energy harvester with dimensions of 28 x 12mm and a piezoelectric film thickness of 30 microns was used. The substrate is repeatedly bent to drive the laminated structure piezoelectric power generation unit fixed on the substrate to generate tensile deformation, so that voltage/current signal output is generated, and the voltage/current signal output generated in the repeated bending process of the device is detected by adopting an electrometer. Fig. 6 is an open-circuit voltage output waveform of the flexible piezoelectric energy collector based on the graphene assembly film under mechanical deformation at different frequencies, and fig. 7 is a short-circuit current output waveform under mechanical deformation at different frequencies. The results from fig. 6-7 show that flexible piezoelectric energy collectors based on graphene assembled films work well at different frequencies. The results of fig. 8-9 show that the open-circuit voltage and current output waveforms of the flexible piezoelectric energy collector based on the graphene assembly film under the repeated action of mechanical deformation for a long time show that the flexible piezoelectric energy collector can stably work for a long time.
Claims (8)
1. The flexible piezoelectric energy collecting system based on the graphene assembly film is characterized by comprising a flexible piezoelectric energy collector based on the graphene assembly film and a piezoelectric energy collecting circuit, wherein the flexible piezoelectric energy collector based on the graphene assembly film comprises a graphene assembly film, a piezoelectric film and a flexible substrate, and the piezoelectric energy collecting circuit comprises a rectifying circuit and an energy storage element.
2. The flexible piezoelectric energy harvesting system based on a graphene assembly film according to claim 1, wherein in the flexible piezoelectric energy harvester based on a graphene assembly film, the graphene assembly film is respectively adhered to the upper surface and the lower surface of the flexible piezoelectric film to form a laminated structure, and two ends of the laminated structure are fixed on the flexible substrate.
3. The graphene assembly film based flexible piezoelectric energy collecting system according to claim 1, wherein the flexible piezoelectric energy collector is operated by bending the flexible substrate to drive the graphene assembly film and piezoelectric film laminated structure fixed thereon to generate tensile deformation.
4. The flexible piezoelectric energy collection system based on the graphene assembly film according to claim 1, wherein the graphene assembly film is formed by stacking graphene sheet layers with micro folds, the thickness of the graphene sheet layers is 10-50 μm, the in-plane apparent Poisson ratio of the graphene sheet layers is negative, and the Young modulus of the graphene sheet layers is 1-5 GPa.
5. The flexible piezoelectric energy collection system based on the graphene assembly film according to claim 1, wherein the flexible piezoelectric film material is a piezoelectric polymer with PVDF as a main component, has a thickness of 10-50 μm, and is subjected to sufficient pre-polarization treatment.
6. The graphene-assembled film based flexible piezoelectric energy harvesting system of claim 1, wherein the flexible substrate is a PET sheet.
7. The graphene-assembled film based flexible piezoelectric energy harvesting system of claim 1, wherein the rectifier circuit is a bridge rectifier circuit.
8. The graphene-assembled film based flexible piezoelectric energy harvesting system of claim 1, wherein the energy storage element is comprised of a number of energy storage capacitors.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113904589A (en) * | 2021-09-13 | 2022-01-07 | 广东墨睿科技有限公司 | Preparation method and application of piezoelectric film substrate-enhanced graphene power generation device |
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| CN113904589A (en) * | 2021-09-13 | 2022-01-07 | 广东墨睿科技有限公司 | Preparation method and application of piezoelectric film substrate-enhanced graphene power generation device |
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