Moisture-enhanced friction power generation device and preparation method and application thereof
By using a combination of asymmetric graphene oxide layer and conductive sliders in friction power generation devices, the problem of output and stability reduction in high humidity environment is solved, and high-stable electrical energy output in humidity environment is achieved.
Patent Information
- Application Number
- CN202411727181.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-28
- Publication Date
- 2025-03-11
AI Technical Summary
Existing friction power generation devices have reduced output and stability in high humidity environments, making it difficult to maintain high output performance in harsh environments.
Using a moisture-enhanced friction power generation device based on an asymmetric graphene oxide layer, a non-symmetric graphene oxide layer is formed by mixing PVDF powder and graphene oxide powder, and covering it with conductive sliders is covered to achieve mechanical friction output electrical energy in a humidity environment.
This device can stably output electric energy in a humidity environment, improve output performance, solve the problem of output drop in a humidity environment, and has flexible application potential.
Smart Images
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Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of new energy power generation, in particular to a moisture enhanced friction power generation device and a preparation method and application thereof. Background Art
[0002] As the overuse of fossil energy has triggered energy crises and global warming, finding sustainable and green energy has become a major challenge facing human civilization. Although renewable energy sources such as wind, solar and geothermal energy have expanded energy supply and reduced environmental pressure, they still face problems such as dependence on specific climate or geographical environments, the need for large and expensive equipment and low conversion efficiency. As a recyclable resource, water is not only essential to life, but also one of the largest energy carriers on Earth. Effectively harvesting this energy means that even a small portion of water contains enough energy to meet current global energy needs.
[0003] Moisture-generated electricity (MEG) devices can convert the chemical energy in water into electrical energy. Under ambient conditions, liquid water continues to evaporate and electrical energy is generated through the migration of ions in the water vapor, a process driven by the ion concentration gradient caused by molecular flow or ion imbalance caused by moisture absorption on the solid surface. However, the power density of wet gas power generation is relatively low and highly dependent on the moisture adsorption capacity of hygroscopic materials. When exposed to a humid environment for a long time, the electrical output of MEG is usually hindered by the complete wetting of the hygroscopic active layer.
[0004] The nano-friction generator is a new energy harvesting technology that converts various mechanical energies in the environment into electrical energy. However, the diversity and variability of the application environment further require the nano-friction generator to be highly adaptable to the working environment, especially in some harsh environments, such as high humidity conditions. Moisture in the atmosphere is easily adsorbed on the surface of the friction layer of the nano-friction generator to form a layer of free water, which accelerates the transmission and dissipation process of the friction charge on the friction surface, resulting in a serious decrease in the output and stability of the nano-friction generator. Therefore, how to achieve a nano-friction generator with high output performance in a high humidity environment is still a big problem. Summary of the invention
[0005] The purpose of the present invention is to provide a moisture-enhanced triboelectric power generation device and a preparation method and application thereof, so as to solve the problem that the current triboelectric power generation technology has strict requirements on environmental conditions during use.
[0006] The present invention is achieved in that:
[0007] The moisture-enhanced triboelectric device provided by the present invention is a moisture-enhanced triboelectric device based on an asymmetric graphene oxide layer. The specific preparation method of the device is: PVDF powder is added to a stirred hydrophilic solvent to prepare a suspension, GO powder is mixed into a PVDF solution, and then coated on an aluminum foil substrate and dried to form an asymmetric graphene oxide layer, and finally a conductive slider is covered on the asymmetric graphene oxide layer. The obtained device can stably output electrical energy by mechanical friction under a certain humidity environment.
[0008] The preparation method of the moisture enhanced triboelectric power generation device provided by the present invention is specifically as follows:
[0009] (1) Aluminum foil substrate treatment: Use sandpaper to polish the surface of the aluminum foil, then use an air gun to blow away the powder formed by polishing, then ultrasonically clean the aluminum foil, then blow dry with nitrogen, and finally perform plasma argon cleaning;
[0010] (2) Preparation of an asymmetric graphene oxide dispersion: adding polyvinylidene fluoride powder to a stirred hydrophilic solvent to obtain a polyvinylidene fluoride solution; mixing the graphene oxide powder into the polyvinylidene fluoride solution to obtain an asymmetric graphene oxide dispersion;
[0011] (3) Preparation of an asymmetric graphene oxide layer: coating the asymmetric graphene oxide dispersion obtained in step (2) on the surface of the aluminum foil obtained in step (1), and then quickly placing it in a preheated oven for drying and ozone treatment to obtain an asymmetric graphene oxide layer;
[0012] (4) Covering the asymmetric graphene oxide layer with a conductive slider.
[0013] Preferably, in the above scheme, the power of plasma argon cleaning in step (1) is 50-150W and the gas pressure is 1-5Pa.
[0014] Preferably, in the above scheme, in step (2), the hydrophilic solvent is any one or more of water, N-dimethylformamide, dimethyl sulfoxide, N-methylpyrrolidone, dimethylacetamide and acetone.
[0015] Preferably, in the above scheme, in step (2), the hydrophilic solvent is formed by stirring at a water bath temperature of 5-35° C. for 5-20 minutes.
[0016] Preferably, in the above scheme, in step (2), the polyvinylidene fluoride solution is formed by stirring at a water bath temperature of 10-45° C. for 4-8 hours; and the mass fraction of the polyvinylidene fluoride solution is 1-20%.
[0017] Preferably, in the above scheme, in step (2), the mass ratio of graphene oxide powder to polyvinylidene fluoride is 1:0.3-1:2; the graphene oxide powder is added to the polyvinylidene fluoride solution and stirred for 6-24 hours to obtain an asymmetric graphene oxide dispersion.
[0018] Preferably, in the above scheme, in step (3), the coating is any one or more of drip coating, spin coating, spray coating, printing, and dipping, the oven is used for 30-60 minutes, and the ozone treatment time is 10-60 minutes.
[0019] Preferably, in the above scheme, in step (3), the conductive slider is any one of aluminum, metal, carbon material, and conductive polymer material.
[0020] The moisture-enhanced friction power generation device of the present invention can use a linear motor to perform mechanical friction at a set mechanical friction frequency and pressure in a humid environment, thereby outputting stable electrical energy.
[0021] Preferably, in the above scheme, the humidity environment refers to an environment with a relative humidity of 5%-90%, and the set mechanical friction frequency and pressure are 0.5-5Hz and 0.1-5N respectively.
[0022] The beneficial effects of the present invention compared with the prior art are as follows: the asymmetric graphene oxide film contacts the surface aluminum to form a Schottky electric field. When friction occurs, surface electron-hole pairs are excited and separated by absorbing the vibration energy of the surface lattice generated by the friction between the aluminum and the film surface. When the Schottky junction is exposed to moisture, a moisture electric field is formed inside the film, which inhibits the recombination of electrons and holes excited by the friction of the Schottky interface, increases the number of electrons and holes that can flow through the Schottky interface, and thus improves the output performance. The device has high output power and stable performance, and has great application potential in the fields of green energy collection, energy supply for electronic equipment, etc.
[0023] Compared with the conventional friction device of graphene oxide layer, the moisture-enhanced triboelectric device of the asymmetric graphene oxide layer of the present invention is more flexible to use, and does not need to consider the influence of high humidity environment on the power generation effect, and is more sensitive to the moisture in the air. In addition, the use of asymmetric graphene oxide as a material for moisture power generation facilitates different surface modifications, can adjust its composition and the types of functional groups, and has good flexibility. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 Schematic diagram of the mechanical friction test platform.
[0025] Figure 2These are SEM images of the samples in Example 1 of the present invention; wherein, (a) is a SEM image of the GO surface; (b) is a SEM image of the PVDF surface; (c) is a SEM image of the surface of a GO / PVDF mixed film (mass ratio is 1:0.3); (d) is a SEM image of a cross section of a GO / PVDF mixed film (mass ratio is 1:0.3).
[0026] Figure 3 This is the EDS oxygen element distribution spectrum of the GO / PVDF mixed film (mass ratio is 1:0.3) in Example 1 of the present invention.
[0027] Figure 4 1 is the IV characteristic curve of aluminum / asymmetric graphene oxide layer / aluminum in Example 1 of the present invention.
[0028] Figure 5 These are stable voltage output curves of the samples in Examples 1, 2 and 3 of the present invention (GO and PVDF mass ratios are 1:0.3, 1:1 and 1:2) at different humidity levels.
[0029] Figure 6 This is the friction voltage output curve of the sample in Example 4 of the present invention at different frequencies and different pressures. DETAILED DESCRIPTION
[0030] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments, but is not limited thereto. Any modification or equivalent replacement of the technical solution of the present invention that does not depart from the spirit and scope of the technical solution of the present invention should be included in the protection scope of the present invention.
[0031] The moisture-enhanced triboelectric device provided by the present invention is a moisture-enhanced triboelectric device based on an asymmetric graphene oxide layer. The specific preparation method of the device is: polyvinylidene fluoride (PVDF) powder is added to a stirred hydrophilic solvent to prepare a suspension, and then the graphene oxide powder is mixed into the PVDF suspension, and then coated on a pure aluminum foil substrate and dried to form an asymmetric graphene oxide layer, and finally the upper layer is covered with a conductive slider. The prepared device has a highly stable output under mechanical friction in a certain humidity environment, which solves the problem of reduced output and stability of existing triboelectric devices under humidity environments. The present invention is described in detail below with specific embodiments.
[0032] Example 1
[0033] The method for preparing the moisture enhanced triboelectric power generation device provided in this embodiment comprises the following steps:
[0034] (1) The aluminum foil was polished with 500-grit sandpaper, and the powder was blown off with an air gun, followed by ultrasonic cleaning, followed by nitrogen drying, and finally plasma argon cleaning. The power of plasma argon cleaning was 100 W and the gas pressure was 2 Pa.
[0035] (2) A certain volume of N-N-dimethylformamide and acetone is mixed in a 6:4 volume ratio and placed in a centrifuge tube. After adding a magnet, it is placed in a water bath and stirred at 25°C for 15 minutes until the mixture is evenly mixed. Then a certain mass of polyvinylidene fluoride (PVDF) powder is weighed and slowly added to the stirring centrifuge tube to prepare a PVDF solution with a mass fraction of 10%. Cover the bottle cap, set to 45°C, and continuously stir magnetically for 4 hours to completely dissolve until a transparent and bubble-free solution is obtained. The desired PVDF solution is obtained. Finally, graphene oxide (GO) powder is mixed into the PVDF solution and magnetically stirred at room temperature for 12 hours to obtain a mass ratio (m GO :m PVDF ) is a mixed solution of 1:0.3.
[0036] (3) Apply the mixed solution to the surface of aluminum foil, then quickly place it in a preheated oven for heat treatment at 110°C for 30 minutes, and then perform surface ozone treatment for 20 minutes. Figure 1 After completion, the upper layer was covered with a conductive aluminum slider, and mechanical friction of the sample was performed using a linear motor at a mechanical friction frequency and pressure of 1.5 Hz and 2 N, respectively, under a relative humidity of 17%.
[0037] The graphene oxide, PVDF and polymer film (GO / PVDF) in this embodiment were tested by SEM, and the results are as follows: Figure 2 The polymer film in this embodiment was subjected to EDS testing, and the results are shown in Figure 3 As shown. Figure 2 , Figure 3 It can be seen that the cross-sectional scanning electron microscopy image of the GO / PVDF mixed film (mass ratio of 1:0.3) shows that the prepared GO / PVDF polymer film has an asymmetric graphene oxide layer, and EDS proves that the oxygen content at the top is higher than that at the bottom. The current-voltage (IV) characteristic test of the aluminum / asymmetric graphene oxide layer / aluminum structure in this embodiment is as follows Figure 4 shown. Figure 4 The IV curve exhibits an S-shape, which indicates that a heterostructure with a Schottky barrier is formed in the Al / asymmetric GO layer / Al.
[0038] Example 2
[0039] Compared with Example 1, the mass ratio of GO and PVDF (m GO :m PVDF) is 1:1, and other processes are the same as in Example 1.
[0040] Example 3
[0041] Compared with Example 1, the mass ratio of GO and PVDF (m GO :m PVDF ) is 1:2, and other processes are the same as in Example 1.
[0042] Example 1, Example 2 and Example 3 were subjected to GO :m PVDF The effect of humidity change on stable voltage under 1:2, 1:1, and 1:0.3 conditions was tested. The results are as follows Figure 5 As shown. Figure 5 It can be seen that the stable voltage increases first and then decreases with the increase of humidity, but the maximum stable voltage and humidity under different mass ratios are different. GO :m PVDF When the ratio of m to 1:0.3 is 1:0.3, the device obtains a maximum stable voltage of 0.62V at 80% RH. GO :m PVDF When the ratio of m to 1:1 is 1:1, the device obtains a maximum stable voltage of 0.64 V at 70% RH, showing an upward trend. GO :m PVDF When the ratio of GO to PVDF is 1:2, the device only obtains a maximum stable voltage of 0.56 V at 80% RH. The significant change in voltage performance can be attributed to the good humidity response of graphene oxide, and the appropriate GO / PVDF mixed film mass ratio mixed doping can effectively improve ion diffusion and the stable voltage of the device in moisture.
[0043] Example 4
[0044] The method for preparing the moisture enhanced triboelectric power generation device provided in this embodiment comprises the following steps:
[0045] (1) The aluminum foil was polished with 500-grit sandpaper, and the powder was blown off with an air gun, followed by ultrasonic cleaning, followed by nitrogen drying, and finally plasma argon cleaning. The power of plasma argon cleaning was 100 W and the gas pressure was 2 Pa.
[0046] (2) A certain volume of N-N-dimethylformamide and acetone is mixed in a 6:4 volume ratio and placed in a centrifuge tube. After adding a magnet, it is placed in a water bath at 25°C and stirred for 15 minutes until it is evenly mixed. Then a certain mass of PVDF powder is weighed and slowly added to the stirring centrifuge tube to prepare a PVDF solution with a mass fraction of 10%. Cover the bottle cap, set to 45°C, and continuously stir magnetically for 4 hours to completely dissolve until a transparent and bubble-free solution is obtained. The desired PVDF solution is obtained. Finally, the graphene oxide powder is mixed into the PVDF solution and magnetically stirred at room temperature for 12 hours to obtain a mass ratio (m GO :m PVDF ) is a 1:1 mixed solution.
[0047] (3) The mixed solution was coated on the surface of the aluminum foil, and then quickly placed in a preheated oven for heat treatment at 110°C, drying time was 30 minutes, and then surface ozone treatment was performed for 20 minutes. After completion, the upper layer was covered with a conductive aluminum slider, and mechanical friction of the sample was performed using a linear motor at a certain mechanical friction frequency and pressure of 0.5 Hz, 1 Hz, and 1.5 Hz, respectively, with pressures of 0.1 N, 0.2 N, 0.5 N, 1 N, and 2 N applied to the friction point of the sample. The results are shown in FIG. Figure 6 shown.
[0048] Depend on Figure 6 It can be seen that when the mechanical friction frequency is constant, the output voltage shows an obvious increasing trend with the increase of friction pressure. When the friction frequency is 0.5Hz, as the friction pressure increases from 0.1N to 2N, the maximum output voltage increases from 4.3V to 5.5V; when the friction frequency is 1Hz, as the friction pressure increases from 0.1N to 2N, the maximum output voltage increases from 4.8V to 7V; when the friction frequency is 1.5Hz, as the friction pressure increases from 0.1N to 2N, the maximum output voltage increases from 5V to 7.3V. It can be concluded that the increase of mechanical friction frequency and friction pressure can increase the friction voltage output, which will be beneficial to the application prospects of devices in different friction environments.
Claims
1. A moisture-enhanced triboelectric device, characterized in that: The device structure comprises an aluminum foil, an asymmetric graphene oxide layer and a conductive slider in sequence; the asymmetric graphene oxide layer is prepared by coating the mixed graphene oxide and polyvinylidene fluoride in a hydrophilic solvent on the aluminum foil.
2. A method for preparing a moisture-enhanced triboelectric power generation device according to claim 1, characterized in that: The steps include: (1) Aluminum foil substrate treatment: Use sandpaper to polish the surface of the aluminum foil, then use an air gun to blow away the powder formed by polishing, then ultrasonically clean the aluminum foil, then blow dry with nitrogen, and finally use plasma argon cleaning; (2) Preparation of an asymmetric graphene oxide dispersion: adding polyvinylidene fluoride powder to a stirred hydrophilic solvent to obtain a polyvinylidene fluoride solution; mixing the graphene oxide powder into the polyvinylidene fluoride solution to obtain an asymmetric graphene oxide dispersion; (3) Preparation of an asymmetric graphene oxide layer: coating the asymmetric graphene oxide dispersion obtained in step (2) on the surface of the aluminum foil obtained in step (1), and then quickly placing it in a preheated oven for drying and ozone treatment to obtain an asymmetric graphene oxide layer; (4) Covering the asymmetric graphene oxide layer with a conductive slider.
3. The method for preparing a moisture-enhanced triboelectric power generation device according to claim 2, characterized in that: In step (1), the power of plasma argon cleaning is 50-150W and the gas pressure is 1-5Pa.
4. The method for preparing a moisture-enhanced triboelectric power generation device according to claim 2, characterized in that: In step (2), the hydrophilic solvent is any one or more of water, N-dimethylformamide, dimethyl sulfoxide, N-methylpyrrolidone, dimethylacetamide and acetone.
5. The method for preparing a moisture-enhanced triboelectric power generation device according to claim 2, characterized in that: In step (2), the polyvinylidene fluoride solution is formed by stirring at a water bath temperature of 10-45° C. for 4-8 hours; the mass fraction of the polyvinylidene fluoride solution is 1-20%.
6. The method for preparing a moisture-enhanced triboelectric power generation device according to claim 2, characterized in that: In step (2), the mass ratio of graphene oxide powder to polyvinylidene fluoride is 1:0.3-1:2; the graphene oxide powder is added to the polyvinylidene fluoride solution and stirred for 6-24 hours to obtain an asymmetric graphene oxide dispersion.
7. The method for preparing a moisture-enhanced triboelectric power generation device according to claim 2, characterized in that: In step (3), the coating is any one or more of drip coating, spin coating, spray coating, printing, and dipping, the oven is used for 30-60 minutes, and the ozone treatment time is 10-60 minutes.
8. The method for preparing a moisture-enhanced triboelectric power generation device according to claim 2, characterized in that: In step (3), the conductive slider is any one of aluminum, metal, carbon material, and conductive polymer material.
9. The moisture-enhanced triboelectric power generation device according to claim 1 and the use of the moisture-enhanced triboelectric power generation device prepared by the method according to any one of claims 2 to 8, characterized in that: In a humid environment, the device uses a linear motor to perform mechanical friction at a set mechanical friction frequency and pressure, thereby outputting stable electrical energy.
10. The use according to claim 9, characterized in that: The humidity environment refers to an environment with a relative humidity of 5%-90%, and the set mechanical friction frequency and pressure are 0.5-5Hz and 0.1-5N respectively.