Study On Improving The Performance Of Triboelectric Nanogenerator By Doping Modification

With the rapid development of mobile electronic devices,miniaturization and portability have become the future trends.Therefore,the research focus is on providing continuous power supply without the need for replacement of energy storage devices.Among various energy harvesting and conversion devices that have been developed,the triboelectric nanogenerator(TENG)has received much attention due to its high output power,broad selection of assembly materials,environmentally friendly manufacturing process,and low cost.Recent research has successfully improved the output performance of TENGs through various doping and modification methods to increase the surface charge density of materials.For example,preparing friction composite materials and altering the nanoscale morphology of the friction material surface are among many methods.In this paper,we improved the properties of the friction material through doping modification and prepared solid-solid and solid-liquid TENG devices to increase the surface charge density of the friction layer,and investigated the reasons for the increase in surface charge density.In the first work,different sizes,densities,and shapes of nano-copper grains were grown on the surface of copper by electrodeposition,and a solid-solid TENG device based on nano-copper grains was prepared.It was found that the output performance of TENG could be significantly improved within a reasonable range of grain distribution density and size.The simulation analysis of grain shape using COMSOL revealed that rectangular nano-grains had the best output performance.In the second work,the performance of a superhydrophobic coating solid-liquid contact triboelectric nanogenerator was studied.By spraying water droplets on the surface of a PTFE film and a superhydrophobic coating,effective separation was achieved,which significantly increased the output performance of the triboelectric nanogenerator,with the highest increase being 102%.The output performance of the TENG showed a positive correlation with the contact angle.However,the thick superhydrophobic coating was prone to losing its hydrophobic properties and being infiltrated,resulting in a sharp decrease in TENG output performance,exceeding 57%.In the third work,the performance of a PDMS/GO composite film triboelectric nanogenerator was studied.The TENG output performance of the composite film doped with different fractions of GO was improved,and the TENG output performance of the film doped with 0.5 volume % PDMS was increased by 44%.As the pressure increased from 1N to 5N,the output performance increased by 46%.The TENG output performance of the composite film gradually increased with the acceleration of the pressing frequency,with the output performance at a pressing frequency of 5Hz being 19%higher than that at a pressing frequency of 1Hz.These experiments provide reference for future related research.