Research On Wave Energy Harvesting Technology And Applications Based On Triboelectric Nanogenerator

Wave energy has the advantages of high energy flow density,low cost and wide distribution,etc.Under the development background of“carbon peak and carbon neutral”,it is of great significance to develop and utilize this green and low-carbon energy.Compared with the traditional electromagnetic generators,triboelectric nanogenerators have the advantages of lightweight,floatability,high conversion efficiency at low frequency,and strong adaptability to irregular and random mechanical motion.However,the ultra-low vibration frequency and low energy conversion efficiency of ocean wave are the bottleneck of harvesting wave energy.In order to solve this problem,a tumbler style triboelectric nanogenerator（TS-TENG）is designed in this study,which can harvest multi-directional wave energy and the energy conversion efficiency can be greatly improved.The main research contents and conclusions are as follows:（1）A novel tumbler style triboelectric nanogenerator is designed,which can harvest wave energy in any direction at sea level independently based on independent layer mode.By exploring the mechanism of energy conversion,COMSOL Multiphysics software was used to simulate and analyze the potential distribution and potential of TS-TENG in operation,we verify the feasibility of TS-TENG as a wave power generation device and to provide theoretical basis for subsequent experiments.（2）The PDMS/CNT inertial dielectric spheres were prepared by blending carbon nanotube particles（CNT）into PDMS by adjusting the ratio of CNT.The output performance of TS-TENG under different CNT contents was systematically studied.The results show that when CNT doping mass fraction is 3.0 wt%,TS-TENG output performance is optimal with a V_OC of 103 V,I_SC of 11.9μA,and Q_SC of 104 n C.Compared with the output performance of TS-TENG with undoped CNT materials,the V_OC,I_SC and Q_SC of TS-TENG power generation unit were improved by 1.6,2.0 and 1.8 times,respectively,and the potential of TS-TENG power generation unit was stabilized near 110min.（3）The motion mechanism and response law of PDMS/CNT inertia dielectric spheres in TS-TENG power generation unit under the interaction of wind,wave and current are revealed.The dynamic model of TS-TENG device in waves and the fluid-mechanical-electrical coupling model between the internal unit of the device and the external waves were established.The effects of the number,diameter of PDMS/CNT inertia dielectric spheres and wave frequency on TS-TENG output performance were investigated.The experimental results show that when the number of PDMS/CNT inertia dielectric spheres n=3 and the diameter r=1 cm,the TS-TENG output performance reaches the maximum value,and the output performance increases with the increase of frequency.（4）Aiming at the problem of Marine environmental pollution,a self-driven electrochemical system was proposed to combine TS-TENG alternating current and electric flocculation technology,which successfully drove the oil-water separation of emulsified oil in oily water and broadened the application range of triboelectric nanogenerator.The performance of TS-TENG alternating current output and the removal efficiency of oily wastewater were investigated.At the working frequency of 0.1 C power consumption and 0.2 Hz,the removal efficiency of oily wastewater can reach 98.3%,which verifies that the ability of removing oily wastewater of low frequency AC is stronger than that of higher frequency AC.