A wood-based hydro-floating power generation device and a preparation method thereof and a hydro-floating power generation system
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- UNIV OF ELECTRONICS SCI & TECH OF CHINA
- Filing Date
- 2025-09-15
- Publication Date
- 2026-08-07
AI Technical Summary
[0003]然而，现有的水伏发电装置仍存在诸多不足：一方面，其结构多依赖人工设计与构筑蒸发通道，制备过程复杂，往往需要额外模板或多步加工；另一方面，常用的聚合物、碳基或无机膜材料不可降解，不符合绿色可持续发展需求
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Figure CN122533448A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of water evaporation power generation (water photovoltaic power generation) technology, and relates to water photovoltaic power generation devices and preparation methods, as well as water photovoltaic power generation systems. Background Technology
[0002] In recent years, water evaporation power generation has attracted widespread attention as an emerging clean energy source. This technology utilizes the ion migration and uneven charge distribution caused by water rising along a porous structure and evaporating at the interface to generate a flow potential and achieve electrical output. It offers advantages such as requiring no external energy source and providing continuous and stable output. Especially in regions with abundant water resources and ample sunshine, interfacial evaporation combined with photothermal enhancement structures has become a core strategy for improving evaporation efficiency and power generation capacity, providing a theoretical and practical foundation for developing new green energy systems.
[0003] However, existing hydro-voltaic power generation devices still have many shortcomings: on the one hand, their structures mostly rely on artificial design and construction of evaporation channels, making the preparation process complex and often requiring additional templates or multiple processing steps; on the other hand, commonly used polymer, carbon-based, or inorganic membrane materials are non-degradable, failing to meet the requirements of green and sustainable development. Meanwhile, gel-based substrates are prone to softening or decomposition at high temperatures, and while carbon-based materials possess excellent photothermal properties, their high thermal conductivity leads to rapid heat loss, limiting the improvement of evaporation efficiency; furthermore, current hydro-voltaic power generation devices generally suffer from insufficient open-circuit voltage, rendering them impractical for application. Overall, existing devices generally suffer from insufficient structural stability, poor environmental friendliness, and inadequate comprehensive performance, making it difficult to simultaneously meet multiple requirements such as efficient water conduction, enhanced photothermal performance, structural stability, and green degradation. The actual power generation performance (open-circuit voltage) needs further improvement.
[0004] Wood-based materials, as naturally derived porous structures, possess high specific surface area and excellent capillary water transport capacity, making them ideal for interfacial evaporation and water-evaporation power generation systems. Their three-dimensional channel network, composed of longitudinal vascular bundles, facilitates continuous water transport and directional heat regulation. Furthermore, wood itself is lightweight, biodegradable, and abundant, aligning with sustainable development strategies. Through functional modification, wood can be endowed with various functions such as interfacial charge regulation, photothermal conversion, and energy harvesting, making it an ideal foundational material for constructing multifunctional energy devices. Summary of the Invention
[0005] This invention aims to overcome the shortcomings of existing technologies and provide a wood-based hydro-voltaic power generation device, its preparation method, and a hydro-voltaic power generation system. The provided wood-based hydro-voltaic power generation device has a simple structure, fully utilizing the porous water-conducting structure and natural modifiability of wood. A Janus structure with an upper hydrophobic layer and a lower hydrophilic layer is creatively constructed on the device surface, integrating a water evaporation-driven potential generation mechanism with solar-assisted photothermal enhancement, achieving continuous and efficient energy conversion and effectively improving the power generation efficiency of the hydro-voltaic power generation device. The provided preparation method for the wood-based hydro-voltaic power generation device is low-cost and easy to implement.
[0006] The technical solution of this invention is as follows.
[0007] This invention provides a wood-based hydrovoltaic power generation device, comprising a wood-based block, one end face of which has a Janus structure with a hydrophilic lower layer and a hydrophobic upper layer; the end face with the Janus structure is selected as the end face of the wood-based block that is perpendicular to the capillary water delivery channel; The Janus structure with a hydrophilic lower layer and a hydrophobic upper layer is obtained by the following two-step process: first, the surface of the wood-based block is modified to be hydrophilic, and hydrophilic ionic groups are introduced; then, one end face of the hydrophilic modified block is pressed into a conical array structure using a molding printing process to form a hydrophobic structure that mimics the surface of a lotus leaf.
[0008] Furthermore, the surface of the Janus structure, which has a hydrophilic lower layer and a hydrophobic upper layer, is coated with fluorinated graphene.
[0009] This invention also provides a wood-based hydroelectric power generation system, comprising N wood-based hydroelectric power generation devices. Each wood-based hydroelectric power generation device uses an electrode clamp to hold upper and lower mesh platinum electrodes, so that the upper and lower mesh platinum electrodes are in close contact with the upper and lower surfaces of the wood-based hydroelectric power generation device. Windows are opened in the middle area of the upper and lower electrodes to facilitate water absorption and evaporation. The N wood-based hydroelectric power generation devices are connected in series; where N is a positive integer. The wood-based hydrovoltaic power generation device includes a wood-based block, one end face of which has a Janus structure with a hydrophilic lower layer and a hydrophobic upper layer; the end face with the Janus structure is selected as the end face of the wood-based block that is perpendicular to the capillary water delivery channel. The Janus structure with a hydrophilic lower layer and a hydrophobic upper layer is obtained by the following two-step process: first, the surface of the wood-based block is modified to be hydrophilic, and hydrophilic ionic groups are introduced; then, one end face of the hydrophilic modified block is pressed into a conical array structure using a molding printing process to form a hydrophobic structure that mimics the surface of a lotus leaf.
[0010] Furthermore, the surface of the Janus structure, which has a hydrophilic lower layer and a hydrophobic upper layer, is coated with fluorinated graphene.
[0011] This invention also provides a method for preparing a wood-based hydroelectric power generation device, comprising the following steps: Step 1: Select wood that grows in tropical or subtropical regions, and cut the wood into uniform geometric dimensions to obtain wood-based blocks; Step 2: Immerse the wood-based blocks obtained in Step 1 in a glutaraldehyde solution to allow the hydroxyl or carboxyl groups on the surface of the wood-based blocks to undergo a cross-linking reaction with glutaraldehyde, providing sufficient reaction sites for subsequent hydrophilic modification of the wood-based block surface. Step 3: Wash the wood-based blocks soaked in the glutaraldehyde solution from Step 2 with distilled water to remove excess glutaraldehyde and byproducts in the solution, and to keep the pores in the wood-based blocks unobstructed to prevent blockage and ensure that the subsequent modification solution can penetrate deeply. Step 4: Soak the wood-based blocks washed in Step 3 in a polystyrene sulfonic acid solution, so that a large number of sulfonate ions in the polystyrene sulfonic acid solution attach to the reaction sites obtained in Step 2, thereby improving the hydrophilicity of the wood-based blocks. Step 5: Take out the wood-based blocks after the surface hydrophilic treatment in Step 4 and dry them to obtain wood-based blocks with surface hydrophilic modification treatment. Step Six: Press the wood-based block obtained in Step Five using an aluminum alloy template with a conical array structure on its surface. Transfer the conical array structure on the surface of the aluminum alloy template to one end face of the wood-based block. The end face is selected as the end face of the wood-based block that is perpendicular to the capillary water transport pipe, thereby forming a Janus structure with a hydrophilic lower layer and a hydrophobic upper layer on the selected end face of the wood-based block, ultimately resulting in a wood-based hydrovoltaic power generation device.
[0012] Furthermore, in step six, after forming a Janus structure with a hydrophilic lower layer and a hydrophobic upper layer on the end face of the selected wood-based block, fluorinated graphene is coated on the surface of the Janus structure.
[0013] Preferably, the geometric dimensions of the wooden block in step one are 2×2×1 cm.
[0014] Preferably, the glutaraldehyde solution in step two is a glutaraldehyde solution with a mass fraction of 4-6%, the soaking time is 2-2.5 hours, and a magnetic rotor is used for stirring during the soaking process; the polystyrene sulfonic acid solution in step four is a polystyrene sulfonic acid solution with a mass fraction of 4-6%, the soaking time is 2-2.5 hours, and a magnetic rotor is used for stirring during the soaking process.
[0015] Preferably, the height of the conical array structure in step six is 0.9-1.1 mm, and the radius of the base is 240-250 μm.
[0016] Preferably, the specific coating method for the fluorinated graphene is as follows: coating with a fluorinated graphene solution of 9-11 mg / ml, and then drying at 50-60°C for 1-2 hours.
[0017] The wood-based hydrovoltaic power generation device prepared by this invention uses natural biomass materials as the matrix, and has the advantages of simple structure, green environmental protection, low cost, and easy processing. Wood has natural longitudinal vessels and sieves, suitable for capillary transport and continuous evaporation of water. The modification process of introducing hydrophilic and ionic functional groups onto the wood surface involves only conventional solution soaking, coating, drying, and imprinting steps, which is simple to operate, low in energy consumption, and does not require expensive equipment, thus possessing good scalability and process compatibility.
[0018] To further enhance water evaporation efficiency and solar energy utilization, this invention creatively constructs a Janus structure with a hydrophobic upper layer and a hydrophilic lower layer on the surface of a wood-based hydrovoltaic power generation device. This structure integrates the potential generation mechanism driven by water evaporation with the solar-assisted photothermal enhancement effect, achieving continuous and efficient energy conversion and effectively improving the power generation efficiency of the hydrovoltaic power generation device. In the Janus structure, the lower layer is a hydrophilic layer modified with polystyrene sulfonic acid solution. Due to the attachment of a large number of hydrophilic ionic groups, it can greatly improve the water evaporation performance of the device, thereby improving its power generation performance and efficiency. The upper layer is a hydrophobic layer with a biomimetic lotus leaf surface structure, incorporating a high-density micro-cone array to form a well-structured and highly repeatable microstructure interface resembling a biomimetic lotus leaf surface. This conical array simulates the micro-nano structure of the natural lotus leaf surface, effectively increasing surface roughness and contact area. During evaporation, it forms a multi-level evaporation interface, meaning that the evaporation process is no longer limited to a single planar interface but occurs simultaneously between structures of multiple scales. The micron-sized cones and nano-sized pores, along with the nanoscale microstructures on the cone surface, allow liquids to spread and coat along these three-dimensional structures, creating more evaporation paths and thus promoting the efficiency of the liquid-gas phase transition, compared to a flat surface. Simultaneously, this structure possesses strong light-harvesting capabilities, enhancing the scattering, absorption, and localized focusing effects of solar radiation, increasing heat input density, and significantly boosting interfacial evaporation intensity and potential generation capacity. Furthermore, its hydrophobic surface properties mimic the self-cleaning effect of a lotus leaf, preventing contaminants, salts, and microorganisms from clogging the wood's capillary channels or causing photothermal degradation during long-term operation, thereby significantly improving the system's operational stability and lifespan.
[0019] In further functionalization of the microstructure surface, this invention coats the wood surface with a fluorinated graphene solution, allowing the fluorinated graphene to adhere to the device surface. Fluorinated graphene possesses both excellent photothermal conversion capabilities and hydrophobicity; under illumination, it can efficiently absorb solar energy and rapidly convert it into heat energy, enhancing the interfacial evaporation rate of water.
[0020] The wood-based solar photovoltaic power generation device constructed in this invention can achieve stable power generation without external power supply and has good energy conversion performance. Actual measurements show that a 2×2×1cm power generation unit can generate an open-circuit voltage of approximately 290mV under normal lighting conditions, demonstrating good electrical output capability.
[0021] Wood-based evaporative electricity technology, leveraging the porous capillary structure and renewable properties of natural wood, has demonstrated superior electrical output performance compared to natural wood after material modification and structural optimization. It also possesses the potential to further overcome voltage and current bottlenecks. In the future, this technology is expected to be applied in low-power IoT, wearable electronics, smart agriculture, and distributed energy, providing continuous energy for environmental monitoring sensors, health monitoring equipment, or farmland irrigation systems. Due to the wide availability, low cost, and biodegradability of wood, wood-based evaporative electricity aligns perfectly with the development trends of green energy and carbon neutrality. With deeper interdisciplinary integration, it is expected to achieve large-scale manufacturing, long-term stable operation, and multi-scenario adaptability, becoming an important supplement to the future clean energy system. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of a wood-based hydroelectric power generation device provided by the present invention.
[0023] Figure 2 A schematic diagram of the fabrication process of the wood-based hydroelectric power generation device provided by the present invention.
[0024] Figure 3 This is a surface SEM image of a wood-based hydrovoltaic power generation device prepared according to Example 1 of the present invention.
[0025] Figure 4 The image shows the contact angle test result of the wood-based hydrovoltaic power generation device prepared in Example 1 of this invention.
[0026] Figure 5 This is a schematic diagram of the testing device for the wood-based hydroelectric power generation device (including electrodes and fixtures) prepared in Embodiment 1 of the present invention.
[0027] Figure 6 The output voltage curve of the wood-based hydrovoltaic power generation device prepared in Example 1 of the present invention is shown.
[0028] Explanation of reference numerals in the attached diagram: 1-Upper test clamp, 2-Metal mesh electrode, 3-Wood-based hydroelectric generator, 4-Lower metal mesh electrode, 5-Lower test clamp. Detailed Implementation
[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0030] Example 1.
[0031] like Figure 1 As shown, a wood-based hydrovoltaic power generation device includes a wood-based block, one end face of which has a Janus structure with a hydrophilic lower layer and a hydrophobic upper layer; the end face with the Janus structure is selected as the end face of the wood-based block that is perpendicular to the capillary water delivery channel. The Janus structure with a hydrophilic lower layer and a hydrophobic upper layer is obtained by the following two-step process: first, the surface of the wood-based block is modified to be hydrophilic, and hydrophilic ionic groups are introduced; then, one end face of the hydrophilic modified block is pressed into a conical array structure using a molding printing process to form a hydrophobic structure that mimics the surface of a lotus leaf.
[0032] Furthermore, the surface of the Janus structure, which has a hydrophilic lower layer and a hydrophobic upper layer, is coated with fluorinated graphene.
[0033] like Figure 2 As shown, balsa wood was selected and cut into 2×2×1 cm cubes. These cubes were then soaked in a 4-6% glutaraldehyde solution at 70-80℃ for 2-2.5 hours, with stirring using a magnetic rotor while heating. The balsa wood cubes were then removed from the glutaraldehyde solution and washed with distilled water at 70-80℃. After washing, the balsa wood cubes were then chemically treated by soaking in a 4-6% polystyrene sulfonic acid solution at 75-85℃ for 2-2.5 hours, with stirring using a magnetic rotor while heating. Finally, the chemically treated balsa wood cubes were removed from the polystyrene sulfonic acid solution and... Modified balsa wood blocks are obtained by drying at 50-60℃ for 1-2 hours. Then, an aluminum alloy plate is selected, and its surface is cut using computer numerical control (CNC) to introduce a conical array of a certain size onto the surface. The cut aluminum alloy plate is then fixed onto the surface of the modified balsa wood block, and the conical array is transferred to the surface of the modified balsa wood block using an embossing transfer method, resulting in a modified balsa wood block with a microstructured surface. Finally, a 9-11 mg / ml fluorinated graphene solution is coated on one side of the modified balsa wood block with a microstructured surface, and then dried at 50-60℃ for 1-2 hours to obtain a wood-based hydrovoltaic power generation device with a Janus structure on the surface.
[0034] It should be noted that in the above preparation process: 1. The essence of this invention is to use natural porous balsa wood as a matrix, perform surface modification and biomimetic surface structure construction, and obtain a wood-based hydrovoltaic power generation device using the principle of water evaporation power generation; 2. The role of soaking balsa wood blocks in glutaraldehyde solution is that natural polymer materials (such as lignin / cellulose-based materials) are rich in hydroxyl / carboxyl groups on the surface. Glutaraldehyde reacts with these groups to achieve cross-linking, providing reaction sites for subsequent PSS adsorption / fixation; 3. The function of washing with distilled water is to remove excess glutaraldehyde, rinse away by-products in the solution, avoid pore blockage, and ensure that the subsequent modification solution can penetrate deeply; 4. The role of soaking in polystyrene sulfonic acid solution is that polystyrene sulfonic acid solution contains a large number of sulfonate groups, forming a functional coating, improving surface hydrophilicity, promoting rapid spread of water on the surface, increasing the zeta potential of the wood-based material surface, thereby releasing hydrogen ions. The hydrogen ions evaporate upward with the water flow, which can further increase the output voltage; 5. The height of the conical array is 0.9-1.1 mm, and the base radius is 240-250 mm. μm, with the cone apex pointing inward, enables the wood block surface to acquire a biomimetic lotus leaf surface structure, giving it good hydrophobic properties while effectively improving surface roughness and contact area. During evaporation, it forms a multi-level evaporation interface, promoting the efficiency of liquid-gas phase change. This structure also has a strong light-harvesting ability, which can enhance the scattering, absorption and local light-concentrating effect of solar radiation, increase the heat energy input density, thereby significantly enhancing the interfacial evaporation intensity and improving the potential generation ability. 6. The surface is coated with fluorinated graphene, which can efficiently absorb solar energy and quickly convert it into heat energy under light conditions, enhancing the water interfacial evaporation rate.
[0035] The wood-based hydroelectric power generation device prepared in this embodiment has the following shape: Figure 1 As shown; the surface microstructure photographed under an electron microscope is as follows Figure 3 As shown, the surface of the generator has a distinct biomimetic lotus leaf protrusion array structure. Figure 4 This is a contact angle test diagram of a wood-based hydrovoltaic power generation device prepared in Example 1; according to Figure 4 The contact angle test diagram shown demonstrates that the upper surface of the Janus structure in this invention has strong hydrophobicity. Figure 5 This is a model diagram of the clamping device for the generator. The clamping device consists of upper and lower parts, each with a 2×2 cm opening at the center to facilitate water absorption and evaporation. Mesh platinum electrodes are fixed at the openings to collect the evaporating charge. The biomimetic lotus leaf-inspired wood-based solar water-voltaic generator is placed between the upper and lower clamps, ensuring close contact between the mesh electrodes and the generator's upper and lower surfaces. The entire device is then placed on the water surface to collect the evaporating voltage. The output voltage versus time curve is shown below. Figure 6 As shown, its output voltage can reach 290mV and can remain stable for a long time.
[0036] Without special explanation, those skilled in the art can fully utilize the wood-based hydroelectric power generation device provided by this invention to construct a wood-based hydroelectric power generation system. The system includes N wood-based hydroelectric power generation devices. Each wood-based hydroelectric power generation device uses an electrode clamp to hold the upper and lower mesh platinum electrodes, so that the upper and lower mesh platinum electrodes are in close contact with the upper and lower surfaces of the wood-based hydroelectric power generation device. Windows are opened in the middle area of the upper and lower electrodes to facilitate water absorption and evaporation. The N wood-based hydroelectric power generation devices are connected in series. Where N is a positive integer.
[0037] Example 2
[0038] Pine wood was used as the natural wood substrate, and the biomimetic lotus leaf-inspired wood-based solar photovoltaic generator was processed and prepared using the same method as in Example 1. The difference lies in the wood substrate material; the corresponding pore size of the longitudinally arranged vascular bundles and sieves inside the substrate is also altered. Under the same testing conditions, the output voltage of this generator was 141 mV.
[0039] Example 3 The wooden substrate is made of paulownia wood as the natural wood, and the biomimetic lotus leaf-shaped wood-based solar photovoltaic generator is processed and prepared using the same method as in Example 1. The difference lies in the wood substrate material; the corresponding pore size of the longitudinally arranged vascular bundles and sieves inside the substrate is also altered. Under the same testing conditions, the output voltage of this device is 187 mV.
[0040] Current research on wood-based evaporative electricity mainly focuses on material modification and structural optimization. Different research teams employ various technical approaches, such as carbonization to enhance conductivity, modification with polymers or inorganic materials to improve surface charge density and ion selectivity, delignification and porosimetry to optimize water transport efficiency, and photothermal composite structures to improve evaporation rates and environmental adaptability. These methods all exhibit differences in electrical output. The following table summarizes typical research results and their performance indicators for cross-sectional comparison: paper Modification methods Output performance Paper 1 Natural balsa wood, without any modification treatment. Open circuit voltage approximately 5 mV Paper 2 Wood-based materials undergo carbonization treatment to enrich them with hydroxyl groups. Open circuit voltage approximately 96 mV Paper 3 Wood-based materials are combined with reduced graphene oxide (rGO). Open circuit voltage is approximately 22.6 mV Paper 4 Composite photothermal material (Ag / PPy) modified lignin-free wood-based materials. Open circuit voltage is approximately 27.5 mV Technical solution of the present invention Wood-based materials were modified with polystyrene sulfonic acid solution, and a micron-scale conical array was introduced on the surface and coated with fluorinated graphene solution to form a Janus structure. Open circuit voltage approximately 290 mV Wood-based evaporative electricity technology, leveraging the porous capillary structure and renewable properties of natural wood, has demonstrated superior electrical output performance compared to natural wood after material modification and structural optimization. It also possesses the potential to further overcome voltage and current bottlenecks. In the future, this technology is expected to be applied in low-power IoT, wearable electronics, smart agriculture, and distributed energy, providing continuous energy for environmental monitoring sensors, health monitoring equipment, or farmland irrigation systems. Due to the wide availability, low cost, and biodegradability of wood, wood-based evaporative electricity aligns perfectly with the development trends of green energy and carbon neutrality. With deeper interdisciplinary integration, it is expected to achieve large-scale manufacturing, long-term stable operation, and multi-scenario adaptability, becoming an important supplement to the future clean energy system.
[0041] Note: Paper 1: ZHOU X, ZHANG W, ZHANG C, et al. Harvesting Electricity fromWater Evaporation through Microchannels of Natural Wood [J]. ACS AppliedMaterials&Interfaces, 2020, 12(9): 11232-9 Paper 2: ZHANG Z, ZHENG Y, JIANG N, et al. Electricity generationfrom water evaporation through highly conductive carbonized wood withabundant hydroxyls [J]. Sustainable Energy&Fuels, 2022, 6(9): 2249-55. Paper 3: LI Z, CHEN D, GAO H, et al. Reduced graphene oxide compositenanowood for solar-driven interfacial evaporation and electricity generation[J]. Applied Thermal Engineering, 2023, 223: 119985. Paper 4: LU W, JIANG D, WANG Z, et al. Simultaneous efficientevaporation and stable electricity generation enabled by a wooden evaporatorbased on composite photothermal effect [J]. Chemical Engineering Journal,2024, 496: 154361。
Claims
1. A wood-based hydrovoltaic power generation device, comprising a wood-based block, wherein one end face of the wood-based block has a Janus structure with a hydrophilic lower layer and a hydrophobic upper layer; the end face with the Janus structure is selected as the end face of the wood-based block perpendicular to the capillary water delivery channel; The Janus structure with a hydrophilic lower layer and a hydrophobic upper layer is obtained by the following two-step process: first, the surface of the wood-based block is modified to be hydrophilic, and hydrophilic ionic groups are introduced; then, one end face of the hydrophilic modified block is pressed into a conical array structure using a molding printing process to form a hydrophobic structure that mimics the surface of a lotus leaf.
2. The wood-based hydroelectric device according to claim 1, characterized in that, The Janus structure, with a hydrophilic lower layer and a hydrophobic upper layer, is coated with fluorinated graphene.
3. A wood-based hydroelectric power generation system, comprising N wood-based hydroelectric power generation devices, each wood-based hydroelectric power generation device using an electrode clamp to hold upper and lower mesh platinum electrodes, so that the upper and lower mesh platinum electrodes are in close contact with the upper and lower surfaces of the wood-based hydroelectric power generation device, and windows are opened in the middle area of the upper and lower electrodes to facilitate water absorption and evaporation; the N wood-based hydroelectric power generation devices are connected in series; where N is a positive integer; The wood-based hydrovoltaic power generation device includes a wood-based block, one end face of which has a Janus structure with a hydrophilic lower layer and a hydrophobic upper layer; the end face with the Janus structure is selected as the end face of the wood-based block that is perpendicular to the capillary water delivery channel. The Janus structure with a hydrophilic lower layer and a hydrophobic upper layer is obtained by the following two-step process: first, the surface of the wood-based block is modified to be hydrophilic, and hydrophilic ionic groups are introduced; then, one end face of the hydrophilic modified block is pressed into a conical array structure using a molding printing process to form a hydrophobic structure that mimics the surface of a lotus leaf.
4. The wood-based hydroelectric power generation system according to claim 3, characterized in that, The Janus structure, with a hydrophilic lower layer and a hydrophobic upper layer, is coated with fluorinated graphene.
5. A method for preparing a wood-based hydroelectric power generation device, comprising the following steps: Step 1: Select wood that grows in tropical or subtropical regions, and cut the wood into uniform geometric dimensions to obtain wood-based blocks; Step 2: Immerse the wood-based blocks obtained in Step 1 in a glutaraldehyde solution to allow the hydroxyl or carboxyl groups on the surface of the wood-based blocks to undergo a cross-linking reaction with glutaraldehyde, providing sufficient reaction sites for subsequent hydrophilic modification of the wood-based block surface. Step 3: Wash the wood-based blocks soaked in the glutaraldehyde solution from Step 2 with distilled water to remove excess glutaraldehyde and byproducts in the solution, and to keep the pores in the wood-based blocks unobstructed to prevent blockage and ensure that the subsequent modification solution can penetrate deeply. Step 4: Soak the wood-based blocks washed in Step 3 in a polystyrene sulfonic acid solution, so that a large number of sulfonate ions in the polystyrene sulfonic acid solution attach to the reaction sites obtained in Step 2, thereby improving the hydrophilicity of the wood-based blocks. Step 5: Take out the wood-based blocks after the surface hydrophilic treatment in Step 4 and dry them to obtain wood-based blocks with surface hydrophilic modification treatment. Step Six: Press the wood-based block obtained in Step Five using an aluminum alloy template with a conical array structure on its surface. Transfer the conical array structure on the surface of the aluminum alloy template to one end face of the wood-based block. The end face is selected as the end face of the wood-based block that is perpendicular to the capillary water transport pipe, thereby forming a Janus structure with a hydrophilic lower layer and a hydrophobic upper layer on the selected end face of the wood-based block, ultimately resulting in a wood-based hydrovoltaic power generation device.
6. The method for preparing the wood-based hydroelectric power generation device according to claim 5, characterized in that, Step 6: After forming a Janus structure with a hydrophilic lower layer and a hydrophobic upper layer on the end face of the selected wood-based block, fluorinated graphene is coated on the surface of the Janus structure.
7. The method for preparing the wood-based hydroelectric power generation device according to claim 5, characterized in that, The geometric dimensions are 2×2×1 cm.
8. The method for preparing the wood-based hydroelectric power generation device according to claim 5, characterized in that, The glutaraldehyde solution mentioned in step two is a glutaraldehyde solution with a mass fraction of 4-6%, and the soaking time is 2-2.5 hours. During the soaking process, a magnetic rotor is used for stirring. The polystyrene sulfonic acid solution mentioned in step four is a polystyrene sulfonic acid solution with a mass fraction of 4-6%, and the soaking time is 2-2.5 hours. During the soaking process, a magnetic rotor is used for stirring.
9. The method for preparing the wood-based hydroelectric power generation device according to claim 5, characterized in that, The cone array structure described in step six has a cone array height of 0.9-1.1 mm and a base radius of 240-250 μm.
10. The method for preparing the wood-based hydroelectric power generation device according to claim 6, characterized in that, The specific coating method for the fluorinated graphene is as follows: coating with a fluorinated graphene solution of 9-11 mg / ml, and then drying at 50-60℃ for 1-2 hours.