CN113904589A

CN113904589A - Preparation method and application of piezoelectric film substrate-enhanced graphene power generation device

Info

Publication number: CN113904589A
Application number: CN202111069250.7A
Authority: CN
Inventors: 蔡金明; 陈其赞; 梁惠明
Original assignee: Guangdong Morion Nanotech Co Ltd
Current assignee: Guangdong Morion Nanotech Co Ltd
Priority date: 2021-09-13
Filing date: 2021-09-13
Publication date: 2022-01-07
Anticipated expiration: 2041-09-13
Also published as: CN113904589B

Abstract

The invention discloses a piezoelectric film substrate enhanced graphene power generation device, wherein a piezoelectric polymer film is provided with a layer of single-layer graphene combined with the piezoelectric polymer film through hydrogen bond force, and the kinetic energy of ionic fluid is converted into electric energy by utilizing the coulomb dragging effect generated between the piezoelectric polymer film enhanced ionic fluid and the single-layer graphene. The graphene functional layer is obtained from a Gr/Cu/Gr copper foil prepared by a CVD method through a traditional wet transfer method and is combined with a piezoelectric polymer film, a silver colloid electrode is arranged on the surface of the graphene functional layer of the single-layer graphene and is packaged, and the graphene power generation device with the reinforced piezoelectric film substrate is obtained, can provide continuous power supply for an independent energy system in the ocean, such as an ocean buoy, detection equipment and the like, and can be used as portable outdoor emergency power supply equipment; the energy can be provided to a body-artificial device, such as a cardiac pacemaker or the like.

Description

Preparation method and application of piezoelectric film substrate-enhanced graphene power generation device

Technical Field

The invention relates to the field of energy conversion, in particular to a preparation method and application of a fluid energy conversion power generation device with a piezoelectric polymer film substrate enhanced single-layer graphene coulomb drag effect.

Background

Energy is a power source for the operation of human industrial machines, and the rapid increase of energy demand is a problem to be faced by all countries in the world. The traditional fossil energy has the defects of environmental pollution, greenhouse gas emission and the like, and various novel and environment-friendly energy conversion technologies are concerned and researched by extensive researchers. In addition, with the rapid development of electronic integration technology, the miniaturization of electronic components is a trend. The existence of the magnetic induction lines has great influence on miniature electronic components, and the traditional cutting magnetic induction line power generation technology provides new challenges in the aspect of power supply of the miniature electronic components. A demand for a miniature, non-cutting magnetic induction line principle generator is provided.

In 2006, the piezoelectric nano power generation concept is proposed for the first time by the professor of Wangzhonglin, and the sequence is drawn from the research of the nano energy conversion technology. The nano generator technology is a novel energy conversion technology, is different from the traditional technology of cutting a magnetic induction line to obtain electric energy, and mainly obtains displacement current through the coulomb drag effect so as to generate the electric energy which can be output. The nano power generation theory is a novel power generation technology for converting energy with micro amplitude and frequency in the nature into electric energy which can be utilized, and can provide guarantee for the sustainable development of human civilization. The nano power generation technology mainly comprises the following steps: the piezoelectric, friction and thermoelectric modes convert mechanical energy/heat energy in nature into usable electric energy.

The kinetic energy of the never-stopping fluid widely existing in nature contains huge energy which is as little as the flow of rainwater and as much as the surge of ocean waves and is ubiquitous in daily life. Since 2001, it was discovered that carbon nanotubes generate a micro-current in flowing liquid, opening the door to the study of two-dimensional material-based fluid energy conversion devices. The single-layer graphene has excellent electrical properties similar to those of carbon nanotubes, and has great development potential in the field of energy conversion application. In 2011, graphene was also demonstrated to be able to obtain voltage from flowing ionic solutions, i.e., to enable the conversion of fluid kinetic energy into electrical energy.

Disclosure of Invention

In order to solve the defects in the prior art, the invention mainly aims to provide a fluid energy conversion power generation device with a piezoelectric polymer film substrate enhanced single-layer graphene coulomb drag effect.

The invention also aims to provide a preparation method of the fluid energy conversion power generation device with the piezoelectric polymer film substrate enhanced single-layer graphene coulomb drag effect.

The invention further aims to provide application of the fluid energy conversion power generation device with the piezoelectric polymer film substrate enhanced single-layer graphene coulomb drag effect.

The purpose of the invention is realized by the following technical scheme:

the invention provides a piezoelectric polymer film substrate enhanced single-layer graphene coulomb drag effect fluid energy conversion power generation device, which mainly comprises the following components: the piezoelectric polymer film comprises a piezoelectric polymer film substrate, a single atomic layer graphene functional layer, a silver colloid electrode and an electrode isolation package. The functional layer of the component is a high-quality P-type graphene layer with an atomic thickness, and the graphene layer is obtained from Gr/Cu/Gr copper foil prepared by a CVD method through a traditional wet transfer method. The piezoelectric high-resolution film substrate of the component uses polyvinylidene fluoride (PVDF) which is generally accepted to be good in comprehensive performance at present, the PVDF is dissolved in an NMP solvent and then coated on a Gr/Cu/Gr copper foil, and a PVDF/Gr/Cu/Gr sample is obtained after heating and curing. And etching away the copper foil by wet transfer to obtain a PVDF/Gr film sample. Different from the method of obtaining the loaded single-layer graphene by using the substrate to fish, the method of directly coating the substrate film enables the graphene layer and the PVDF piezoelectric substrate to form a seamless load, and the PVDF and the graphene can form hydrogen bond combination, so that the binding force of the graphene and the PVDF piezoelectric substrate is enhanced, the toughness of the graphene functional layer is greatly improved, and the substrate film has the characteristics of being folded and bent without cracking. The electrode design is obtained by coating high-conductivity silver colloid on two ends of a graphene loading surface of the PVDF/Gr film and leading out the high-conductivity silver colloid through two leads. This is due to the linear band structure that graphene exhibits near the dirac point, and the density of electronic states at this location is low. The Fermi level of the graphene is relatively adjustable in a certain range, namely ohmic contact is easily formed, so that an electrode in ohmic contact can be obtained by simply coating conductive silver colloid. And finally, coating and packaging the surface of the electrode by using a hydrophobic polymer material, such as PDMS, PS, PVA and the like, so as to complete the preparation of the component.

The specific power generation principle is as follows: the ionic charge centers in solution are fixed, i.e. the carriers of the ions themselves cannot pass to the graphene layer. In addition, the graphene is applied to a hydrophobic material, and the aqueous solution can roll on the surface of the graphene without being wetted and adsorbed. When the liquid drop of the ionic solution flows on the surface of the single-layer graphene layer, the negative electric ions in the solution and the P-type single-layer graphene generate a friction coupling effect, so that the graphene obtains induced hole carriers at the position of the liquid drop and moves along with the movement of the liquid drop. Graphene hole carriers caused by the movement of the ionic solution droplets move along with the ionic solution droplets to show a coulomb drag effect, so that the graphene obtains a micro-current in the movement direction of the ionic solution droplets. In order to balance micro current formed by the movement of hole carriers in the graphene layer, the graphene generates a reverse electric field through a Faraday-like electromagnetic induction effect, and two electrodes of the graphene in the flowing direction of the ionic solution obtain a tiny voltage, so that the conversion of fluid kinetic energy and electric energy is realized. The piezoelectric material is a material capable of obtaining piezoelectric charges through micro pressure deformation, the PVDF piezoelectric material which is generally recognized at present has better comprehensive performance, a flexible PVDF piezoelectric film substrate can be obtained through coating, and the flexible PVDF substrate with a film structure can more easily obtain larger deformation under micro pressure to generate more piezoelectric charges. When the ionic solution flows through the surface of the graphene, the solution with certain mass and momentum enables the flexible PVDF piezoelectric film substrate to form pressure deformation, and therefore piezoelectric charges are generated at the pressure deformation position of the ionic liquid drop/graphene interface. As the shielding length of the single-layer graphene is only about 0.6nm, and the distribution range of the piezoelectric charges is far larger than that of the graphene, the piezoelectric charges of the unshielded part penetrate through the graphene functional layer to act on the ionic solution. This causes ions in solution with a charge opposite to the piezoelectric charge to accumulate toward the piezoelectric change center, trying to shield the piezoelectric charge of the PVDF piezoelectric film substrate. However, in the process of the ionic solution moving on the surface of the graphene, the moving speed of carriers in the graphene is several orders of magnitude faster than that of ions in the solution, and the ions in the ionic solution gathered due to piezoelectric charges cause hysteresis due to the movement. The coulomb drag effect of the graphene is further enhanced, so that a larger water flow induced voltage is obtained. In addition, the single-layer graphene is used in the invention, because the multi-layer graphene can enhance the range and strength of electromagnetic shielding and counteract the enhancement effect of piezoelectric charges.

According to the principle explanation, the pressure film substrate reinforced graphene power generation device can convert the energy of ionic fluid in the environment into utilizable electric energy. The method is a novel nano power generation technology different from the conventional cutting magnetic induction line power generation technology. It is known that there are a wide range of ionic fluid resources in nature, such as surge in the sea, flowing water in rivers, raindrops falling down, and running blood in the body. The pressure thin film substrate enhanced graphene power generation device provided by the invention can convert the tiny fluid energy in the environment into electric energy, and in addition, the fluid impact kinetic energy is fully utilized to realize the enhancement effect of the piezoelectric thin film substrate of the device, so that the development potential of the power generation device in miniaturization, scale and amplification is improved. The device can provide continuous power supply for independent energy systems in the ocean, such as ocean buoys, detection equipment and the like; can be used as portable outdoor emergency power supply equipment; the energy can be provided to a body-artificial device, such as a cardiac pacemaker or the like.

Compared with the prior art, the invention has the following beneficial effects:

1. the piezoelectric polymer film substrate-enhanced fluid energy conversion power generation device with the single-layer graphene coulomb drag effect is simple to prepare, has the characteristics of flexibility, toughness and the like, and can be attached to different plane and curved surface base layers.

2. A fluid energy conversion power generation device with a piezoelectric polymer film substrate enhanced single-layer graphene coulomb drag effect uses a flexible piezoelectric film substrate to enhance a graphene functional layer.

3. The fluid energy conversion power generation device with the piezoelectric polymer film substrate enhanced single-layer graphene coulomb drag effect uses the PVDF piezoelectric substrate which is a single-layer graphene composite flexible film, has good light transmission, and is suitable for environments with light transmission requirements.

4. The piezoelectric polymer film substrate-enhanced fluid energy conversion power generation device with the single-layer graphene coulomb drag effect can be suitable for fluid environments of any ionic fluid, such as oceans, rivers, rainwater, human blood and the like.

5. The piezoelectric polymer film substrate enhanced fluid energy conversion power generation device with the single-layer graphene coulomb drag effect can be used as a fluid induction type nanometer power generator, and provides important reference significance for research of biomedical micro-device power generators.

Drawings

Fig. 1 is a schematic structural diagram of a fluid energy conversion power generation device with a piezoelectric polymer film substrate enhanced single-layer graphene coulomb drag effect according to the present invention.

FIG. 2 is a graphene Raman spectrum of a fluid energy conversion power generation device with a piezoelectric polymer film substrate enhanced single-layer graphene coulomb drag effect, and FIG. 1 shows graphene I loaded on a flexible piezoelectric material PVDF film substrate_2D/I_G=2.7, indicating that the loaded graphene is a monolayer, less defective graphene.

Fig. 3 is an experimental field diagram of a fluid energy conversion power generation device with a piezoelectric polymer film substrate enhanced single-layer graphene coulomb drag effect.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

The following are specific examples:

as shown in fig. 1, the main components of the fluid energy conversion power generation device with the single-layer graphene coulomb drag effect enhanced by the piezoelectric polymer film substrate provided by the invention include: the piezoelectric polymer film comprises a piezoelectric polymer film substrate 1, a single atomic layer graphene functional layer 2, a silver colloid electrode 3 and an electrode isolation package. The functional layer of the component is a high-quality P-type graphene layer with an atomic thickness, and the graphene layer is obtained from Gr/Cu/Gr copper foil prepared by a CVD method through a traditional wet transfer method.

Example 1

The invention provides a preparation method of a piezoelectric polymer film substrate enhanced single-layer graphene coulomb drag effect fluid energy conversion power generation device, which comprises the following specific steps:

(1) growing single-layer and high-quality graphene on a copper foil by a CVD (chemical vapor deposition) method to obtain a single-layer graphene/copper foil/single-layer graphene (Gr/Cu/Gr) sample, wherein the specific preparation process comprises the following steps:

and S1, sequentially cleaning the copper foil by using dilute hydrochloric acid and absolute ethyl alcohol, and finally blowing the copper foil by using nitrogen flow to remove burrs and dust on the surface of the copper foil.

S2, fixing the cleaned copper foil in a graphite sample holder and transferring the graphite sample holder to a cold wall CVD furnace;

s3, Ar and H₂The flow rate is 100sccm and 10sccm respectively, the ventilation time is 10min, and the rough pumping mechanical pump is opened for gas washing;

s4, after the gas washing is finished, closing the gas path, and pumping the cold wall CVD furnace to 5 x 10^-2After mbar, the rough pumping mechanical pump is closed, the molecular pump is opened to pump the furnace chamber pressure vacuum degree to 5 x 10^-5mbar, which aims to evacuate the air inside the oven cavity.

S5, opening the gas path, and controlling Ar and H₂Flow rate distributionRespectively 100sccm and 10sccm, and after the gas flow is stabilized, the temperature of the furnace chamber is increased to 920 ℃ at a temperature increasing rate of 5 ℃/min, which is a temperature increasing stage of the furnace chamber.

S6, keeping the gas flow unchanged after the temperature of the furnace chamber reaches 920 ℃, and preserving the heat for 30min, so as to stabilize the temperature of the cavity at 920 ℃.

S7, opening an ethylene gas circuit and controlling C₂H₄The gas flow rate was 100sccm and nucleation growth was performed on the copper foil for 10 min.

S8, adjusting C after finishing nucleation growth₂H₄The gas flow rate was 230sccm, and film formation growth was performed on the copper foil for 30 min.

And S9, after the film forming growth is finished, stopping heating until the temperature of the cavity reaches normal temperature, and obtaining a copper foil sample (Gr/Cu/Gr) with double-sided growth single-layer graphene.

(2) A Gr/Cu/Gr copper foil sample is cut into a single sample of 10cm by using a paper cutter, and the copper foil needs to be flat in the cutting process so as to ensure that graphene on the surface of the copper foil is not damaged due to folds.

Both the step (1) and the step (2) are to prepare the graphene functional layer 1 of the monoatomic layer on the copper foil.

(3) Attaching the single-piece sample obtained in the step (2) to a smooth glass sheet by using a PI adhesive tape, wherein the edge position attached by the PI adhesive tape needs to be pressed tightly, so that the solution cannot penetrate into the bottom of the copper foil in the coating process, and the difficulty brought to the subsequent etching work is avoided; meanwhile, the sample is not directly attached to a spin coating disc of a coating machine or a flexible substrate is not selected for attachment, so that the Gr/Cu/Gr copper foil sample is still kept smooth in the coating process, and the subsequent etching work is facilitated.

(4) And (3) sticking the attached sample obtained in the step (3) on a spin coating disc of a coating machine by using a double-sided adhesive tape, wherein the glass substrate needs to be symmetrically placed in the attaching process so as to prevent the substrate from being thrown away due to asymmetric torque in the coating process.

(5) And (4) dripping a proper amount of absolute ethyl alcohol into the sample in the step (4), and then rotating for 5s at a low speed of 1000r/s and rotating for 20s at a high speed of 3000 r/s. The method aims to remove dust particles naturally adsorbed on the surface of a Gr/Cu/Gr copper foil sample.

(6) PVDF-900 PVDF powder is dissolved in NMP solution and is stirred at high speed to obtain PVDF precursor solution with the mass fraction of 6%. The mass fraction of the PVDF precursor solution prepared in the step needs to be less than or equal to 8 percent, otherwise, the PVDF precursor solution causes difficulty in coating work due to overhigh viscosity.

(7) And (3) dropwise adding an appropriate amount of the PVDF precursor solution obtained in the step (6) on the surface of the Gr/Cu/Gr copper foil sample obtained in the step (5), performing spin coating treatment for 20s at the rotating speed of 800r/s to uniformly coat the PVDF precursor solution on the surface of the Gr/Cu/Gr copper foil sample, and performing secondary coating after 5 minutes for 3 times.

(8) After the coating treatment is finished, the glass substrate is taken down from the rotating disc and is placed on a heating platform at 70 ℃ for heat curing treatment for 10min, and a cured PVDF/Gr/Cu/Gr sample is obtained. The curing temperature is set to be not lower than 50 ℃ and not higher than 100 ℃, and the excessive high temperature and the excessive low temperature are not beneficial to curing the PVDF.

The steps (3) to (8) are to prepare the piezoelectric polymer film substrate 1, and PVDF is preferable for the piezoelectric polymer film substrate 1, and polar polymer materials such as polyvinylidene fluoride, polyvinyl fluoride, nylon, and the like can also be selected.

(9) The PI tapes were carefully peeled off from the samples of step (8) using tweezers, and the PVDF/Gr/Cu/Gr samples were smoothly transferred to a container containing 2/3 volume volumes of FeCI at a concentration of 1mol/L using flat-headed plastic tweezers₃When the PVDF/Gr/Cu/Gr sample is transferred to an etching solution in a glass culture dish (D =18cm, h =3 cm) of the etching solution, one side of the sample is firstly contacted with the etching solution, and then the sample is slowly and smoothly paved on the surface of the etching solution so as to ensure that the etched surface of the sample is completely contacted with the etching solution and no air bubbles remain on the bottom surface of the sample.

(10) In a dust-free, noise-free, vibration-free environment, the copper foil of the sample of step (9) was completely etched and a PVDF/Gr film sample was obtained. In the etching process, the etching solution is required to be ensured to have no vibration influence as much as possible so as not to damage Gr on the upper surfaceIn addition, in the etching process, FeCI can be added in a proper amount according to the color of the solution₃And etching the solution.

(11) And (10) after the copper foil is etched to be invisible to naked eyes (the film is transparent), continuously etching for 30min to ensure that no small-particle-size copper particles remain on the graphene load surface of the PVDF/Gr film, then replacing the etching solution with deionized water by using a plastic high-capacity (not less than 50 ml) injection agent, and rinsing.

(12) After rinsing, two clean glass rods are used for fishing the PVDF/Gr film to the dust-free paper, the PVDF/Gr film is dried through natural air drying or a heating platform at 60 ℃, a flexible and transparent PVDF/Gr film can be obtained, in addition, in order to solve the Gr quality on the film, Raman characterization is used, and a Raman spectrum (shown in figure 2) shows that I_2D/I_G=2.7, i.e. graphene on the surface PVDF/Gr surface is a high quality single layer graphene.

The steps (9) to (12) are to transfer the graphene functional layer 2 into the piezoelectric polymer thin film substrate 1, and to prepare the electrode 3 on the graphene functional layer 2.

(13) The PVDF/Gr film obtained in step (12) is clamped between two weighing sheets of paper and cut into strips of about 5cm by 10cm using a paper cutter and applied to a glass sheet having a certain roughness using PI tape. The step uses a single glass with certain roughness as a supporting substrate, and aims to obtain ideal pressure deformation of the PVDF piezoelectric film when an ionic solution flows through the surface of the PVDF/Gr film, so that more piezoelectric charges can be obtained.

(14) Conductive fast-curing silver paste is used for coating a layer of 5cm wide silver paste on two ends of a 5cm x 10cm strip-shaped PVDF/Gr film to be used as electrodes, and two leads are respectively connected.

(15) The fluid energy conversion power generation device with the single-layer graphene coulomb dragging effect enhanced by the piezoelectric polymer film substrate can be obtained by carrying out hydrophobic packaging treatment on the electrodes by using materials such as PVA, PVDF and PDMS.

(16) And (3) inclining the sample obtained in the step (15) by an angle of 30 degrees, connecting the two electrodes by using an multimeter to build a test circuit, taking 0.01mol/L NaCI solution with a certain volume by using a rubber head dropper, sliding down from the bottom of the glass support substrate, and obtaining 12mV voltage response by using the multimeter. The inclination angle of the step can not be less than 10 degrees and can not be more than 80 degrees, because the inclination angle is too low, the flow velocity of the ionic solution is too low, the response voltage of the graphene functional layer is too low, and when the inclination angle is too high, the component force (pressure) of the gravity of the ionic solution on the surface vertical to the PVDF/Gr film is too small, and the reinforcing effect of the piezoelectric substrate is weakened.

(17) In order to verify the enhancement effect of the PVDF film substrate made of the piezoelectric material on the graphene Gr, when a brush pen soaked with 0.01mol/L of NaCI solution fluff is used for scratching the surface of the PVDF/Gr film which is horizontally placed, the response voltage gradually rises with the increase of pressure, and the maximum response voltage can reach 85 mV.

Example 2

This example differs from example 1 in that DMF was used instead of 0.01mol/L of NaCI ion solution in example 1, respectively, and the other steps were not changed. The purpose is to verify the influence of the non-ionic fluid on the response voltage, and the result shows that no voltage response exists when DMF liquid drops flow through the surface of the PVDF/Gr film. The coulomb drag effect cannot be formed by the nonionic solution and the graphene functional layer.

Example 3

This example differs from example 2 in that deionized water was used instead of the DMF solution in example 2, and the other steps were not changed. The purpose is to verify the influence of the polarity of the solution on the response voltage, and the result shows that a tiny voltage response (about 1 mV) is found when the deionized liquid drops flow across the surface of the PVDF/Gr film, which indicates that the polar solution can form a coulomb drag effect with the graphene functional layer.

Example 4

This example differs from example 3 in that tap water was used instead of the deionized water solution in example 3, and the other steps were not changed. The purpose is to verify the influence of the ion concentration of the solution on the response voltage, and the result shows that when deionized liquid drops flow across the surface of the PVDF/Gr film, a voltage response of about 5mV is found, which indicates that the ion concentration of the solution is one of the key factors for limiting the response voltage.

Example 5

This example is different from example 1 in that the influence of the inclination angle on the voltage response is made different from 20 ℃ by adjusting the inclination angle in step (16) in example 1 within the range of 20 ° to 80 ° with a gradient of 10 °. The objective was to find the optimum angle between the ionic solution flow rate and the pressure on the PVDF/Gr film, to find that the response voltage shows a tendency to increase and decrease first, and to obtain a large response voltage at an inclination angle of 30 deg..

Example 6

This embodiment is different from embodiment 4 in that the influence of the inclination angle on the voltage response is made different from 20 ℃ by adjusting the inclination angle in step (16) in embodiment 4 within the range of 20 ° to 80 ° with a gradient of 10 °. The objective was to find the optimum angle between the ionic solution flow rate and the pressure on the PVDF/Gr film, to find that the response voltage shows a tendency to increase and decrease first, and to obtain a large response voltage at an inclination angle of 30 deg..

Analysis of the above embodiment shows that the factors influencing the voltage mainly include the flow rate of the ionic fluid and the pressure of the ionic fluid on the piezoelectric polymer thin film substrate. Referring to example 5, and example 6, when the inclination angle is larger, the flow velocity of the ionic fluid is larger, and the dragging benefit on the graphene is more obvious. However, when the inclination angle is 0 to 45 °, the pressure of the ionic fluid on the piezoelectric polymer film substrate becomes gradually smaller with the increase of the angle, and when the inclination angle is 45 °, the pressure approaches half of the gravity, the deformation of the piezoelectric polymer film substrate is smaller, the strengthening effect is not obvious, and the piezoelectric charge is also reduced, so that the best point for coulomb drag power generation is before 45 °, experimental verification of examples 5 and 6 shows that the maximum response voltage is obtained when the inclination angle is 30 ° by changing the voltage generated by the inclination angle test with the inclination angle of 10 ° as the gradient within the range of 20 ° to 80 °.

Example 1 above, the present invention is not limited to the above examples, and any other changes, modifications, substitutions, combinations and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents and are included in the scope of the present invention.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The utility model provides a graphite alkene power generation device of piezoelectric film substrate reinforcing which characterized in that: comprises that

The graphene functional layer is a single-atomic-layer graphene;

a piezoelectric substrate layer serving as a carrier of the graphene functional layer is selected from a piezoelectric polymer film as a material for preparing the piezoelectric substrate layer, so that the coulomb dragging effect of the graphene functional layer is enhanced;

and the electrode is arranged on the surface of the piezoelectric substrate loaded with the graphene functional layer.

2. A piezoelectric thin film substrate-enhanced graphene power generating device according to claim 2, wherein: and the surface of the electrode is provided with an electrode isolation package.

3. The method for manufacturing a piezoelectric thin film substrate-enhanced graphene power generation device according to any one of claims 1 or 2, wherein: comprises the following steps

1) Growing single-layer graphene on a copper foil by adopting a CVD (chemical vapor deposition) method to obtain the copper foil with the upper surface and the lower surface both growing the single-layer graphene;

2) under the condition that the copper foil is flat and free of wrinkles, a PVDF precursor solution is coated on any surface of the copper foil where single-layer graphene grows;

3) carrying out thermosetting treatment on the copper foil coated with the PVDF precursor solution on the surface to form a PVDF layer, namely the piezoelectric substrate layer; at the moment, one surface of the graphene functional layer is combined with the piezoelectric substrate layer through a hydrogen bond, and the other surface of the graphene functional layer is combined with the copper foil;

4) etching the copper foil through wet transfer to obtain a film with a structure of PVDF/single-layer graphene;

5) coating silver colloid used as an electrode on the surface of the film loaded with the single-layer graphene obtained in the step 4) to obtain the piezoelectric film substrate enhanced graphene power generation device.

4. The method for preparing a piezoelectric thin film substrate-enhanced graphene power generation device according to claim 3, wherein: before the step 2), the copper foil obtained in the step 1) is required to be cut to prepare a copper foil with required specification; the cut copper foil is kept flat and free of wrinkles, and the monoatomic layer graphene on the surface of the copper foil is not damaged.

5. The method for preparing a piezoelectric thin film substrate-enhanced graphene power generation device according to claim 3, wherein: before any surface of the copper foil on which the single-layer graphene grows is coated with the PVDF precursor solution, the coated surface of the copper foil is cleaned, and the other surface of the copper foil is shielded, so that the PVDF precursor solution cannot penetrate into the other surface of the copper foil.

6. The method for preparing a piezoelectric thin film substrate-enhanced graphene power generation device according to claim 3, wherein: the preparation method of the PVDF precursor solution comprises the steps of dissolving PVDF-900 powder in an NMP solution, stirring at a high speed, and obtaining the PVDF precursor solution with the mass fraction of less than or equal to 8%.

7. The method for preparing a piezoelectric thin film substrate-enhanced graphene power generation device according to claim 3, wherein: and the curing temperature of the copper foil coated with the PVDF precursor solution is controlled to be 50-100 ℃ in the thermal curing treatment step.

8. The method for preparing a piezoelectric thin film substrate-enhanced graphene power generation device according to claim 3, wherein: in the step 4), FeCl is selected as the etching solution₃Solution, ensuring the bottom surface of the copper foil and FeCl in the etching step₃The solution was in full contact without any residual bubbles.

9. The method for preparing a piezoelectric thin film substrate-enhanced graphene power generation device according to claim 3, wherein: the silver adhesive is fast-curing silver adhesive, and a lead is connected to the silver adhesive.

10. The application of the graphene power generation device enhanced by the piezoelectric film substrate is characterized in that: graphene power generation device obtained according to any one of claims 1 to 9, placed in a moving ionic fluid, and converting the ionic fluid energy into electrical energy by means of the coulomb drag effect.