Fully Flexible Homogeneous Integrated Triboelectric Enhanced Energy Harvester’s Design And Its Performance

With the gradual application of wearable electronic devices in many fields,such as health detection,motion monitoring,military and other fields,energy harvester plays an increasingly critical role.Energy harvester can convert mechanical energy(walking,running,jumping,slapping,etc.)of people into electric energy,and realize long-term reliable and continuous power supply for various wearable monitoring devices,which solves the defects of traditional batteries,such as hard texture,large volume,limited capacity and environmental pollution.In recent years,more and more researchers continue to optimize the structure and innovative materials.However,the functional layer of the vertical contact-separation triboelectric energy harvester is heterogeneous integration,which is easy to be damaged under strong external excitation,so the structural stability needs to be further optimized.In addition,the contact-separation efficiency between the triboelectric materials is limited,which limits the output performance of the final device and needs further improvement.In this paper,starting from optimizing the structure of triboelectric energy harvester,the purpose is to develop a large area,low-cost fiber fabric with high power generation efficiency and stretchability,and a portable energy device with good energy conversion mechanism.High temperature vulcanized silicone rubber with high tensile performance was used as the matrix material.On this basis,conductive particles and negative triboelectric materials were filled to study the preparation process of materials such as colloidal vulcanization and powder dispersion,so as to lay a foundation for the development of high-efficiency energy exchange materials.Through the sandpaper reverse molding process and high temperature vulcanization process,a miniaturized air cavity type flexible triboelectric power generation unit with integrated triboelectric layer and spacer layer and homogeneous integration of each functional layer was prepared,which enhanced the structural stability of the device.Based on the triboelectric power generation unit,the structure design of warp and weft realized the collection of friction electric energy inside,between and outside the layer,improving the triboelectric power generation effect of the device.The electrical performances of the devices were studied by using the test platform.The results show that the output current(peak to peak)and output voltage(peak to peak)of the triboelectric power generation unit(1×1 cm~2)were 1.1μA and 130 V,respectively.The output performance of the device had no obvious attenuation after 10000 cycles,which further ensures the good reliability of the device.Through testing the charging characteristics of the triboelectric power generation unit,human motion energy such as walking,tiptoe,jumping were collected.Under the pressure of 50 N and frequency of 3 Hz,the triboelectric effect enhanced fabric could obtain 16.6μA peak to peak short circuit current and 728 V peak to peak open circuit voltage.When the external load resistance was 10~6Ω,the output power density of 1.77 W/m~2can be obtained.The effects of different excitation frequencies on the voltage and current,durability and capacitor charging response were investigated.The ability of the fabric to collect human motion energy was explored through different ways of human body swing and flapping,and the reliability of the device in the wearable field was verified.