Charge Separation Balance Control And Performance Improvement Of Triboelectric Nanogenerator

In recent years,with the rapid development of the times and the rapid development of science and technology,the Internet of things(IOT)technology has also developed rapidly,The Internet of things combines all kinds of information using sensor devices with the Internet to form a huge network,realizing the interconnection of people,machines and things anytime and anywhere.As a new type of self-driving energy harvesting device,the triboelectric nanogenerator(TENG)can integrate and collect a large number of disorderly and divergent micro-nano energy sources in life,and supply power for many sensors and small electronic devices in this Internet of things system.The theoretical basis of the triboelectric nanogenerator is Maxwell’s displacement current,and the charge density of the triboelectric layer directly determines the output performance of the triboelectric nanogenerator.The more static charges exist in the triboelectric layer,the more external circuit charges are induced.When the triboelectric layer undergoes a period of contact electrification process,the triboelectric charge separation rate gradually decreases.In this process,the charge accumulated on the surface of the triboelectric layer will eventually reach saturation,and no new charge transfer will occur between the triboelectric layers after saturation.At this time,the charge separation of triboelectric nanogenerator is in dynamic equilibrium,and the output power reaches the maximum.Therefore,in order to further improve the output performance of the triboelectric nanogenerator,it is necessary to further increase the triboelectric charge separation rate,or slow down the decay rate of the charge separation rate,so that the triboelectric layer can obtain more triboelectric charge,thereby increasing the output of the generator.This is the most fundamental way to improve the performance of triboelectric nanogenerator.In this work,we first developed a new type of friction nanogenerator with gap structure,The structure produces discharge phenomenon during the operation of the generator,and uses the discharge effect to continuously consume the surface charge of the friction layer,breaking the dynamic balance of charge separation between Al and PVDF as the triboelectric layer in the process of contact electrification,Improve the space and ability of the PVDF triboelectric layer to continue to obtain triboelectric charge,thereby increasing the output charge rate of the generator.In addition,the influence of gap distance,gap mode,strength,PVDF fiber-based material,double-layer structure on the discharge effect under this structure was also explored.The experiment finally increased the charge output by about 10 times.After that,we explored the influence of the external electric field on the charge separation balance during the contact electrification of the triboelectric nanogenerator.When a positive electric field is applied to the triboelectric layer,the triboelectric charge separation rate is regulated during the contact electrification process.The electrons will accelerate the transfer to the PVDF side,resulting in an increase in electron transfer in a short time,and the triboelectric charge carried in the triboelectric layer increases,thereby increasing the charge output of the external circuit.The experiment verified the "forward" and "reverse" regulation effects of the external electric field on the contact electrification process,and the piezoelectric electric field was used to realize the intermittent autonomous regulation of the friction nanogenerator,thereby improving the output performance.The in-depth study and discussion of the triboelectric charge separation rate in this work will help to further improve the output performance of the triboelectric nanogenerator,and has important guiding significance for the theoretical research of the triboelectric nanogenerator.