Research On Seaweed Structure Like Triboelectric Nanogenerator For Water Wave Energy Harvesting

With the development of exploitation of ocean resources,the strategic position of the ocean is extremely important to every country.Underwater wireless sensor network is an important means of ocean resources development,ocean scientific research and ocean environmental monitoring,which is of great significance to the construction of maritime power.The current way of underwater sensor node power supply is commonly conductor directly connected or carrying the battery.But with the increase of long-term observation,the quantity of sensor nodes,and the expansion of distribution,this way of energy supply will be unable to meet demand.Wave energy as a new energy exhibits higher energy density,less environmental impact and the average available time is long.So,the development of ocean wave energy is to be of great practical significance for solving underwater sensor node power supply.However,traditional wave power generation technology is mainly aimed at high power generation,and does not focus on the power supply of a single sensor.Therefore,designing a reasonable energy harvesting system and power conversion device,improving the utilization of wave energy and reducing the cost of water wave energy generation are important research directions of wave energy generation technology.The working principle of TENG is based on the coupling of triboelectrification and electrostatic induction,and the theoretical source is Maxwell's displacement current.Currently,various types of TENGs have been developed for harvesting water wave energy.Compared to traditional electromagnetic generator,TENG has higher output efficiency for harvesting low-frequency(<5Hz)wave energy,so that it has unique applications prospect for capturing wave energy.Seaweed is flexible so it has well adaptability for different amplitude and frequency of wave motion.Here,we designed a seaweed structure like triboelectric nanogenerator(SS-TENG)for harvesting wave energy.The main research contents are as follows:(1)The paper designed the structure of seaweed structure like TENG based on the contact-separation TENG model.Analyzing the working mechanism,establishing the V-Q-x relationship equation,and variation is simulated by finite element method.(2)To efficiency capture water wave energy,the structural design is a key factor to meet the complexity of ocean wave motion.So,SS-TENG composed of PTFE film as the hermetic package,FEP film and printing ink as the triboelectric material and electrodes.Its flexible characteristics can adapt to different amplitude and frequency of wave conditions.(3)We studied the output characteristics of seaweed structure like triboelectric nanogenerator(SS-TENG)from two aspects,structure size(width and length of dielectric material)and swing condition(amplitude and swing frequency).The results showed that with the increase of width and length of FEP film,the open circuit voltage and transferred charge will increase.With the increase of amplitude,the open circuit voltage and transferred charge will increase and if the frequency increase,the output performance will be better.(4)In order to study its working performance,whether it can be used in the power supply of ocean sensors,the SS-TENG is connected to the working circuit for power experiment and charging experiment.With the increase of resistor,the output power of SS-TENG firstly and next decrease.In the best conditions,when external resistance is 50M?,the maximum output power is 2.04 m W/m2.The device will charge 10min with a capacitance of 10?F,the charging voltage of capacitance reaching 3V.Seaweed structure like TENG shows great performance in water wave energy harvesting,and it has important development value of ocean wireless sensor network power supply.