Research On Wave Energy Acquisition System Based On Triboelectric Nanogenerator

The energy industry has always been the cornerstone supporting the existence and progress of human society.Over the past 200 years,fossil fuel-based energy systems have greatly promoted the development and progress of human society.However,the large-scale use of fossil fuels has caused serious environmental problems around the world.Therefore,the research and development and application of new energy is regarded as an important task to solve the energy crisis.Wave energy has the advantages of high energy density and wide distribution,so it is of great significance to develop and utilize this green and lowcarbon energy under the background of "carbon peak and carbon neutrality".Triboelectric nanogenerator is very suitable for energy acquisition in low frequency environment,so the application of triboelectric nanogenerator to wave energy acquisition has become a research hotspot in recent years.The main research contents and conclusions of this paper are as follows:(1)A submersible flexible triboelectric nanogenerator used to collect ocean wave energy is designed,and its overall working principle and factors affecting the generation of triboelectric nanogenerator are theoretically analyzed,and the optimization direction to improve the contact-separation frequency and charge storage of the generating unit is determined.PDMS are selected as the dielectric layer of triboelectric nanogenerator units according to its working environment and motion characteristics.(2)The offshore wave characteristics are studied,and the transient fluid simulation experiment is carried out on the situation of the fixed frame column of the diving flexible triboelectric nanogenerator proposed in this paper in the sea wave.Four kinds of fixed frames with different shapes and circular fixed frames with different arrangement are analyzed.The force and Karman vortex street effect under the wave action of low speed,medium speed and high speed were analyzed.The results show that vortex streets are more likely to be generated in low-velocity sea waves when the fixed frame is a positive quadrilateral prism,while vortex streets are more stable when the fixed frame is in mediumvelocity sea waves and high-velocity sea waves.(3)COMSOL Multiphysics was used to analyze the electric field of the generation unit of the triboelectric nanogenerator designed in this paper.When the distance between the upper and lower plates of the generation unit changed between 0 mm and 1 mm,obvious charge transfer occurred between the electrodes.When the distance is greater than 1 mm,the charge transfer between electrodes decreases sharply with the change of the position of the upper and lower plates.The fluid-solid coupling simulation of the flexible body was carried out to analyze the bending and swinging conditions of the flexible body of different lengths in the waves with low,medium and high velocity,and to determine the appropriate size of the flexible body in different sea conditions.The optimum matching lengths of flexible power generation devices are 150 mm,200 mm and 250 mm respectively for low,medium and high speed waves.(4)The influence law of the incorporation of carbon nanotubes and barium titanate nanoparticles on the performance of PDMS thin film was explored experimentally.By improving the capacitance structure of PDMS thin film and improving the dielectric constant,the PDMS friction layer was optimized,and the electrical output capacity of the triboelectric nanogenerator unit was enhanced.The maximum open-circuit voltage and short-circuit current increased by 83% and 63%,respectively.The submersible flexible triboelectric nanogenerator designed in this paper was prepared and applied in practice.20 LEDs were lit in the Marine environment.