Multi-interface Structure Triboelectric Nanogenerator

With the gradual promotion of 5G technology and the rapid application of Internet of things,the further development of distributed Nanogenerator technology become particularly important.The triboelectric nanogenerator can collect low-frequency mechanical energy in the environment,can be applied to a variety of complex environments,and use the mechanical energy in the environment to power various Micro-Nano devices.Due to its own structural characteristics,TENGs generally have output characteristics of high-voltage and low-current,and their current output capacity is mainly restricted by the maximum charge capacity of the friction layer.Therefore,how to increase the maximum charge carrying capacity has become a hot topic in current TENGs research.During the working process of the Triboelectric Nanogenerator,on the one hand,due to the frictional electrification effect,there is continuous new charge separation and transfer on the surface of the friction layer;on the other hand,due to the electrostatic field formed by the triboelectric charge between the friction layers,there is a small part of the charge in the friction layer which will drift to the back electrode,and the final equilibrium state of the two determines the maximum charge capacity of the friction layer.Therefore,improving the maximum charge capacity can be considered from two aspects:increasing the separation rate of triboelectric charge and reducing the loss of triboelectric charge in the direction of the back electrode.Based on the study of the charge distribution in the friction layer of the interface structure,this paper analyzes the flow of the triboelectric charge in the friction layer through the interface potential well,and the hindering effect of the interface potential well on the friction charge loss.The interface potential well inside the friction layer can provide more storage space for the triboelectric charge,while effectively reducing charge loss and improving the maximum charge capacity of the friction layer.Through theoretical analysis and experimental verification,the influence of the thickness of the sub-layer and the number of interface potential wells on the maximum charge-carrying capacity of the friction layer is discussed.The maximum charge-carrying capacity of a 1.5μm single-layer PVDF friction layer is only 5n C/cm~2,while the maximum charge capacity of a PVDF multi-interface structure friction layer with a total thickness of 1.5μm with 10 interfaces can reach 40n C/cm~2.On this basis,through theoretical analysis,it can be known that the multi-interface structure friction layer can be used in combination with other conventional friction layer charge density enhancement methods to produce a superimposing effect,which further improves the output performance of the triboelectric nanogenerator.In this paper,by improving the friction layer of the multi-interface structure,the surface treatment of the friction layer and the method of reducing the carrier concentration of the friction layer further improved the maximum charge carrying capacity of the friction layer,and the maximum charge carrying capacity of the friction layer reached 162 n C/cm~2.This project provides a new solution to solve the problem of limited current output of friction nanogenerators,and has a certain guiding role in improving the output performance of various TENGs,which is beneficial to accelerate the application of TENGs.