Study On Charge-excitation Triboelectric Nanogenerator Based On Carbon Silicon Gel Electrode And Its Output Performance

With the rapid development of science and technology,the world is stepping into the era of artificial intelligence and big data.In modern society,advanced mobile electronic devices and wireless electronic sensing systems are ubiquitous in our everyday life.To ensure proper working of these electronic sensing systems,chemical batteries and capacitors have been used as power sources to power these electronic devices and sensors.However,these conventional energy storage devices have some serious flaws.Such as,environmental pollution,cost issues,service life,safety risk issues,etc.Therefore,we need to find an effective technology to solve the problem of distributed energy supply of wireless sensor networks.In 2012,triboelectric nanogenerators were invented by Wang's team based on tribo-electrification and electrostatic induction and aim to provide distributed energy supplies by harvesting mechanical energy from ambience.TENGs have the advantages of high energy conversion efficiency,low cost,strong structural flexibility,rich material selection.They can convert blue energy,wind energy,vibration energy and water drop energy into electrical energy.It can effectively solve the distributed energy supply problem.In addition to being an energy supply device,TENGs can also be used as multifunctional sensors.In order to further improve the output performance of TENGs and expand its application range,we need to continuously increase the output charge density.The previously invented charge excitation TENG provides a most effective method to achieve the maximum charge output of TENG devices.Based on the charge excitation TENG,this work adopts a novel design to further improve the output charge density of TENGs.The main research work is as follows:In this work,we designed a vapor deposition electrode that can quantify the actual contact area of the contact-separation TENG.With this method,the contact efficiency of the contact-separation TENG with different structures can be effectively determined.Secondly,we established the air breakdown model of charge excitation TENG.Through the air breakdown model,we have determined the key factors to increase the output charge density of charge excitation TENG.Again,using silicone gel and carbon nanoparticles,we made the flexible carbon gel electrode.Under the same conditions,the flexible electrode can increase the effective contact area of TENG.Using 4?m PEI film and homemade carbon silicone gel electrode,in an ambient atmosphere with a relative humidity of 5%,we can obtain a high charge density as high as 2.38 m C m^-2.The external excitation TENG with flexible electrodes can directly light up 456 LEDs.The device can continuously drive the thermometer and hygrometer at a working frequency of 5 Hz.This work also reveals the actual charge density(over 4.0 m C m^-2)in a TENG electrode based on quantified surface micro-contact efficiency and provides a prospective technical approach to improve the charge density,which could push the output performance of TENG to a new horizon.