A graphene film for power generation on the hull of an ocean-going vessel

Abstract

The application discloses a graphene film for power generation of a ship body of an ocean-going ship and relates to the ship plating film technical field; the PET / PE / nGr-PVDF attached to the ship body can make the ship body have higher heat dissipation efficiency; because the heat conductivity coefficient of the graphene film is about 5000 W / m*K, the heat conductivity coefficient of stainless steel is 50-60 W / m*K, and the ship sails in the open sea, the rapid transmission of excessive heat can make the ship have a more stable running state. Furthermore, the PET / PE / nGr-PVDF covering the stainless steel structure of the ship body can not only prevent the corrosion of the stainless steel but also can continuously generate power, thereby improving the endurance of the ship, and because the graphene film is a super-hydrophobic layer, the rapid separation of the washed seawater can reduce the adhesion of pollutants.

Description

Technical Field

[0001] This invention discloses a graphene film for power generation on the hull of ocean-going vessels, relating to the field of ship coating technology. Background Technology

[0002] Research on nano-energy conversion technology has begun. It is a new type of energy conversion technology that differs from the traditional method of obtaining electrical energy by cutting magnetic field lines. It mainly obtains displacement current through the Coulomb drag effect to generate output electrical energy.

[0003] Graphene film materials have a high specific surface area, approximately 2640 m². 2 The photovoltaic (PV) mechanism involves the formation of an electrical double layer when a water droplet comes into contact with the surface of a graphene nanowall. As the water droplet flows, charge migration occurs between the droplet and the graphene double layer, generating an electric potential. This potential is then transferred through the highly conductive graphene to collect electrical energy. However, due to the high inertness of the graphene surface, it is difficult to increase the charge density of the double layer during PV using chemical grafting while maintaining its high conductivity (a prerequisite for charge migration). Therefore, simultaneously increasing the charge density in the double layer and accelerating its migration is crucial for improving the efficiency of graphene thin-film PV power generation.

[0004] Currently, most ship coatings are done by painting or other methods. Chinese patent CN 105305884B discloses a sliding power generation device assembled by dripping seawater and NaCl salt water onto the surface of a reduced graphene oxide film. This device utilizes graphene's sensitivity to external stimuli, conductivity, and adsorption properties to generate voltage and current signals by sliding seawater and NaCl salt water droplets onto the reduced graphene oxide film surface. However, the existing technology utilizing graphene's hydroelectric power generation function has not significantly improved the operational benefits for ships.

[0005] Content of this invention

[0006] The purpose of this invention is to provide a graphene film for generating electricity on the hull of ocean-going vessels.

[0007] To achieve the above-mentioned technical objectives and effects, the invention is implemented through the following technical solution:

[0008] A graphene film for power generation on the hull of ocean-going vessels, which covers the stainless steel structure of the hull with PET / PE / nGr-PVDF.

[0009] Furthermore, a method for preparing graphene films for power generation on the hull of ocean-going vessels includes the following steps:

[0010] S1. Multilayer graphene films were grown on copper foil using chemical vapor deposition (CVD) to obtain sample nGr / Cu.

[0011] S2. nGr / Cu is laminated with PE / PET to obtain a PET / PE / nGr / Cu sample;

[0012] S3. The PET / PE / nGr / Cu sample rolls are hot-pressed together to assist in peeling, resulting in two types of samples: Cu and PET / PE / nGr.

[0013] S4. Use a mold to hot press and reshape PET / PE / nGr, reshaping the planar structure into different types of non-planar three-dimensional structures;

[0014] S5. Add a layer of piezoelectric material PVDF to the back of the mold of the non-planar three-dimensional PET / PE / nGr that has been re-hot-pressed and deformed.

[0015] Furthermore, in S3, a constant pressure and temperature are applied to the sample, so that the bonding force between PE and nGr is greater than the bonding force between nGr and Cu.

[0016] Beneficial effects:

[0017] The present invention attaches a layer of PET / PE / nGr-PVDF to the hull, which will make the hull heat dissipation efficiency higher. This is because the thermal conductivity of graphene film is ~5000W / m·K, while that of stainless steel is 50~60W / m·K. When sailing in the open sea, the rapid transfer of excess heat can enable the ship to achieve a more stable operating state.

[0018] In the technical solution provided by this invention, PET / PE / nGr-PVDF covering the stainless steel structure of the ship not only prevents the stainless steel from corroding but also enables continuous power generation, improving the ship's endurance. Furthermore, because the graphene film is a superhydrophobic layer, the seawater washed away can quickly detach, reducing the adhesion of pollutants.

[0019] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0020] Figure 1 This is a diagram of multilayer graphene transferred onto a Si / SiO2 substrate in an embodiment of the present invention;

[0021] Figure 2 These are the Raman spectra at the corresponding positions in the embodiments of the present invention;

[0022] Figure 3 This is a flowchart illustrating the implementation in an embodiment of the present invention;

[0023] Figure 4 These are photographs of roll-to-roll transfer objects from embodiments of the present invention.

[0024] Figure 5 These are actual photos of PET / PE / nGr objects from embodiments of the present invention;

[0025] Figure 6 These are photographs of PET / PE / nGr resistance measurements in embodiments of the present invention;

[0026] Figure 7 This is a schematic diagram of PET / PE / nGr hot pressing and shaping in an embodiment of the present invention;

[0027] Figure 8 This is a schematic diagram of the power generation structure in an embodiment of the present invention. Detailed Implementation

[0028] In the prior art, patent CN 113904589 A proposes a fluid energy conversion power generation device based on a piezoelectric polymer thin film substrate and a single-atom-layer graphene Coulomb drag effect. The main components include four parts: a piezoelectric polymer thin film substrate, a single-atom-layer graphene functional layer, silver paste electrodes, and electrode isolation encapsulation. The functional layer of this device is a high-quality p-type graphene layer with a thickness of one atom, obtained from Gr / Cu / Gr copper foil prepared by CVD using a traditional wet transfer method. The piezoelectric polymer thin film substrate of this device uses polyvinylidene fluoride (PVDF), which is currently recognized as having good overall performance. PVDF is dissolved in NMP solvent and coated onto Gr / Cu / Gr copper foil, then cured by heating to obtain a PVDF / Gr / Cu / Gr sample.

[0029] Unlike monolayer graphene loaded by using a substrate, the method of directly coating a substrate film allows the graphene layer to form a seamless load with the PVDF piezoelectric substrate. Furthermore, PVDF and graphene can form hydrogen bonds, which enhances the bonding force between graphene and the PVDF piezoelectric substrate and greatly improves the toughness of the graphene functional layer, giving it the characteristics of being wrinkled, bent, and unbreakable.

[0030] Based on this, the corresponding solution is implemented in the present invention through the following embodiments:

[0031] 1. Multilayer graphene films were grown on copper foil using chemical vapor deposition (CVD) to obtain the sample nGr / Cu, such as... Figure 1 As shown; 2. nGr / Cu is laminated with PE / PET to obtain a PET / PE / nGr / Cu sample, where PE is polyethylene and PET is polyethylene terephthalate; as shown Figure 3 As shown, the PET / PE / nGr / Cu sample rolls were hot-pressed together for assisted peeling (a certain pressure and temperature were applied to the sample so that the bonding force between PE and nGr was greater than the bonding force between nGr and Cu), as shown. Figure 4 As shown, two types of samples were obtained: Cu and PET / PE / nGr. The electrical measurements of the samples are as follows. Figure 5As shown in Figure 6; 3. PET / PE / nGr is reshaped by hot pressing using a mold, reshaping the planar structure into different types of non-planar three-dimensional structures, such as... Figure 7 As shown, this is used to increase the graphene coverage per unit area on the hull. 4. A layer of piezoelectric material PVDF is added to the back of the mold of the re-hot-pressed, non-planar three-dimensional PET / PE / nGr. Finally, the PET / PE / nGr-PVDF is attached and fixed to the stainless steel of the hull, as shown. Figure 8 As shown.

[0032] The final working process is as follows: During the ship's voyage, seawater continuously washes over the non-planar three-dimensional PET / PE / nGr-PVDF structure on the hull. The washed seawater flows along the A-side of the graphene film in the PET / PE / nGr, generating an electric double layer. As the seawater flows, charge migration occurs between the seawater and the electric double layer on the graphene surface, generating an electric potential. Finally, the energy is collected through the highly conductive graphene. The B-side of the graphene film in the PET / PE / nGr, which has not been exposed to seawater, is covered with a layer of PVDF piezoelectric material. The seawater flowing over the A-side causes deformation of the PVDF on the B-side. The deformed PVDF tends to exhibit a capacitive effect with charging and discharging capabilities, and the graphene on the B-side, with its coverage, induces more charge (similar to the working principle of complementary metal-oxide-semiconductor CMOS devices in transistors). This increases the carrier concentration, reduces the resistance of the graphene film, and is more conducive to the transmission of electricity generated by the seawater and the graphene film.

[0033] The final result is an increase in the amount of graphene coverage per unit area on the ship's hull, and an increase in the conductivity of the graphene film, both of which are beneficial for increasing the power generation of seawater and graphene films.

[0034] Among them, PET / PE / nGr is achieved by roll-to-roll hot pressing assisted transfer, which is simple, efficient and conducive to industrialization, and avoids the pollution of copper etching. The transferred copper foil can be recycled, and the price per square meter is reduced by nearly 54 yuan.

[0035] Graphene power generation devices are long-life devices. Because they do not involve chemical reactions, the loss of active materials during power generation is avoided. As a result, the power generation device in this invention will not reduce its power output due to the reduction of active materials during use. Therefore, its performance degradation is very small, allowing it to be used for a long time and avoiding frequent maintenance.

[0036] The hot-pressed, reshaped non-planar three-dimensional structure of PET / PE / nGr-PVDF not only increases the graphene coverage per unit area on the ship's hull, but also enhances the conductivity of the graphene film due to the piezoelectric material on the B-side. Both of these factors contribute to increasing the power generation of seawater and the graphene film. For example, by setting the height and width of the non-planar three-dimensional structure to be the same, the graphene film coverage per unit area can be doubled. Figure 7 The A structure in it.

[0037] The above are merely some of the embodiments of this application and are not intended to limit the application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments shall still fall within the scope of protection of the technical solution of this application.

Claims

1. A method for preparing a graphene film for power generation on the hull of an ocean-going vessel, characterized in that, Includes the following steps: S1. Multilayer graphene films were grown on copper foil using chemical vapor deposition (CVD) to obtain sample nGr / Cu. S2. nGr / Cu is laminated with PE / PET to obtain a PET / PE / nGr / Cu sample; S3. The PET / PE / nGr / Cu sample rolls are hot-pressed together to assist in peeling, resulting in two types of samples: Cu and PET / PE / nGr. S4. Use a mold to hot press and reshape PET / PE / nGr, reshaping the planar structure into different types of non-planar three-dimensional structures; S5. Add a layer of piezoelectric material PVDF to the back of the mold of the non-planar three-dimensional PET / PE / nGr that has been re-hot-pressed and deformed to obtain PET / PE / nGr-PVDF graphene film.

2. The method for preparing graphene films for power generation on the hull of ocean-going vessels according to claim 1, characterized in that, In step S3, a constant pressure and temperature are applied to the sample, such that the bonding force between PE and nGr is greater than the bonding force between nGr and Cu.

3. The PET / PE / nGr-PVDF graphene film prepared by the method for preparing graphene film for power generation in the hull of ocean-going vessels according to any one of claims 1-2 is applied to the stainless steel structure of the hull.

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