Study On Flexible Hybrid Nanogenerator Constructing By Organic-Inorganic Composite

The rapid progress of Internet of Things technology accelerates the development of nanogenerators.The energy collection technology of nanogenerator applied to wireless sensors can solve the defect of limited sensor battery life.Piezoelectric Nanogenerator Energy Harvesting(PEH)and Triboelectric Nanogenerator Energy Harvesting(TEH)can transform all forms of mechanical energy into electric energy,and have great applications in the fields of Internet of Things,sensors,electronic information,and medical treatment.However,the nanogenerator has poor output stability and low output power,which is difficult to be applied.Therefore,it is necessary to continue to improve the nanogenerator on the basis of the existing research,which can make the electrical performance output of the nanogenerator higher,more stable,and more conducive to integration and practical application through reasonable structural design.For example,Hybrid Nanogenerator Energy Harvesting(HEH)is prepared through piezoelectric-friction coupling.This paper uses lead-free piezoelectric ceramic powder and organic polymer to prepare flexible films,and prepares them into PEH or HEH devices,and the influence of preparation process,composite ratio,device packaging methods and different electrode materials on the output performance of the nanogenerator was explored.The main research contents and conclusions are as follows:(1)The effects of different composite processes,powders and composite proportions on the microstructure,morphology structure and output performance of BNT-BT/P(VDF-CTFE)flexible films were systematically studied.The results show that the droplet membrane method is more favorable for the preparation of uniform composite films with excellent flexibility and uniform thickness.The output performance of PEH composed by BNT-BT calcined powder and P(VDF-CTFE)composite flexible film is more stable.When the composite ratio of BNT-BT calcined powder is 15wt%,the output performance of PEH is the best,which can output 2.89 V open-circuit voltage and 889 n A short-circuit current.(2)The effect of different composite proportions on the microstructure and phase structure of BTS/P(VDF-CTFE)flexible composite films,as well as the effects of different encapsulation methods and different forces on the performance of PEH have studied.The results show that the composite film prepared by the drop film method is thin and flexible.BTS/P(VDF-CTFE)flexible composite film prepared by drop film method,and which encapsulated with polyimide film to obtain HEH.The maximum open-circuit voltage and short-circuit current of HEH prepared by 2wt%BTS/P(VDF-CTFE)were 4.16 V and 2.5μA,respectively,which were much higher than the output performance of PEH and TEH prepared by 2wt% BTS/P(VDF-CTFE)flexible composite film.The HEH maintains steady output performance after 800 cycles,and can produce up to 12 V of open circuit voltage when struck by fist.(3)The influence of different electrode materials on the output performance of PEH prepared by BTS/PDMS thin film was studied,and the power generation mechanism characteristics of triboelectrification and piezoelectric coupling were explored.The results show that the open circuit voltage of PEH with ITO/PET and Copper foil tape electrode is 10 V,which is higher than the open circuit voltage of 3V generated by PEH with Ni/Cu conductive fiber electrode.In the packaging process,HEH with ITO/PET,Copper foil tape electrode,Ni/Cu conductive fiber as the bottle electrode and ITO/PET as the top electrode have higher open-circuit voltage and short-circuit current than that of PEH.However,the HEH with Ni/Cu conductive fiber as the bottle electrode and ITO/PET as the top electrode shows more stable output signal and has open-circuit voltage and short-circuit current are 275 V and 1.5μA,respectively.The HEH can convert the mechanical energy generated by the impact into electrical energy and light up two red LED lights through the rectifier without external power.