| In recent years,due to the severe energy crisis and the increasing demand for wearable smart devices,it is necessary to find new sustainable energy sources.Among various energy harvesting devices,triboelectric nanogenerators(TENGs)with the advantages of light weight,wide range of material options,low cost and high output power has outstanding potential in energy harvesting,sensing and other fields.However,TENG has the disadvantages of limited performance output,poor durability,and immature integrated manufacturing processes.How to obtain high-performance,durable,and high-energy conversion efficiency of TENG is a problem that needs to be solved at present.A material optimization method provided in this paper provides an effective way to improve the output performances of TENG and the durability.The details are as follows:In this paper,the in situ growth of semiconductor ZnO was successfully implemented on the lead-free ferroelectric ZSO nanoparticles with high purity and self-polarization by a facile method.A uniformly dispersed flexible ZSO/ZOZS/PDMS composite film was fabricated and prepared as the negative friction layer of TENG.The TENG fabricated exhibits excellent output performances of Voc 218 V,Isc 14.5μA,Q 60nC,and output power density of 24.625μW/cm~2,respectively.The TENG designed can successfully light up 212 LEDs and charge the electronic devices without any external power supply.The TENG designed showed stable voltage output in repeated contact tests of more than 32,000 cycles,proving that the TENG designed has good output cycle stability.Besides,it can be used as a favorable sensor monitoring device.In addition,a microcapacitive P@B/P-CNT/PDMS flexible composite film was prepared as the tribonegative layer in this paper.Barium titanate(BTO)with high dielectric constant and carboxyl carbon tube(COOH-CNT)with high aspect ratio were doped simultaneously into PDMS as the flexible matrix.By coating the BTO with polydopamine on the surface,the binding force to the matrix interface was enhanced effectively.The surface non-covalent modification of COOH-CNT with polymethylphenylsiloxane(PMPS)was used to effectively improve the dispersion of the filler in PDMS matrix.After BTO coated with polydopamine and CNT non-covalent modified by PMPS,compared with the BTO and CNT modification,the dielectric constant is increased by 13%,the output voltage,output current and transfer charge of composite film-based TENG were 138 V,13μA and 41 nC,respectively,which are 331%,776%and 583%higher than TENG based pure PDMS.By polarizing the composite film containing ferroelectric fillers,the surface charge density of the composite film was increased,and the output voltage,output current and transfer charge of TENG based the composite film were 153 V,16μA and 49 nC,respectively,which were 10.8%,23%and 20%higher than TENG based the composite film unpoled.The TENG designed had excellent durability under different service conditions and had good application prospect in the field of energy harvesting. |
