Research Of Triboelectric Nanogenerator With Bionic Fish-like Structure In Weak Dynamical Water Flow

With the continuous development of social economy and industrialization,the country’s demand for energy continues to increase.Increasing the development and utilization of environmental renewable energy to build a new clean energy system is one of the important ways to achieve the goal of carbon peaking and carbon neutrality.Due to the low frequency,it is difficult to harvst environmental energy effectively.Triboelectric nanogenerators have attracted wide attention,which can effectively convert mechanical energy into electrical energy in the environment.Rivers are rich in energy,and hydropower accounts for the majority of renewable electricity supply,accounting for 15.9% of the world’s electricity generation and 65.1% of the total renewable electricity.However,it is difficult to utilize the energy of weak dynamical water flow in widely distributed low-velocity rivers.Therefore,the triboelectric nanogenerator with bionic fish-like structure is proposed,which can harvest the energy of weak dynamical water flow effectively.The main research contents are as follows:The basic principle and electrical characteristics of triboelectric nanogenerator are explained and the theoretical mechanism of energy conversion is analyzed.Based on the basic theory of triboelectric nanogenerator,the theoretical model of freestanding triboelectric-layer mode is described,and the influencing factors of electrical characteristics are analyzed.The mechanical characteristics of spring connection are analyzed in detail,which provides a theoretical basis for the selection of spring and the structural design of the prototype.Combined with the theory of triboelectric nanogenerator,the structure design of bionic fish-like structured triboelectric nanogenerator is carried out,including bionic shape,bionic fin,power generating unit and connecting unit.According to the different power generation principles of the generating units,two experimental principle prototypes were designed.The bionic shape,connecting unit,electrode structure and overall size of the two principle prototypes were determined.The simplified model of power generation unit is analyzed and simulated,which proves the rationality of structure design.Based on the theoretical analysis and simulation results,the experimental principle prototypes of two kinds of fish-shaped triboelectric nanogenerator are developed.The basic components of the experimental principle prototypes are analyzed in detail,and the processing and manufacturing process is given.Combining experimental testing instruments with experimental testing environment,the basic experimental testing system and water driven experimental testing system are built to provide support for subsequent experimental testing and research.Experimental studies on the output performance of the bionic fish-like structured triboelectric nanogenerator are carried out.The influence of different length and installation position of the bionic fins,and physical parameters such as different motion frequency,motion angle and motion acceleration on the electrical performance was explored.By connecting with the rectifier circuit,the bionic fish-like structured triboelectric nanogenerators can light the LEDs and drive the temperature and humidity sensor,which provides a new idea for water flow energy harvesting in weak dynamical water environment.