Studies On The Structure Design And Performances Of PTFE Based Triboelectric Nanogenerator Based On Environmental Wind Energy And Acoustic Energy Harvesting

With the rapid development of the Internet of Things,small electronic products play an increasingly important role in people’s lives.Nowadays,the small electronic products involved in the Internet of Things are still generally based on the traditional battery power supply.Battery power supply will bring many problems such as inconvenient replacement and environmental pollution,which has caused certain problems for people’s daily life.Therefore,it is urgent to develop new clean energy.The emergence of triboelectric nanogenerator(TENG)brings new dawn to solve the above problems.It is a potential technical solution for the sustainable development of society to convert the abundant mechanical energy in wind energy and acoustic wave environment into electrical energy,TENG has obvious advantage in harvesting environmental mechanical energy.However,the technology of effectively harvesting wind and acoustic energy needs to be improved.In the first work of this thesis,a kind of hybridized TENG driven by windmill is designed,which can capture wind energy and acoustic energy effectively at the same time.The sound driven TENG(S-TENG)is composed of two conductive fabric layers and electrospun P(VDF-Tr FE)nanofibers sandwiched in the middle.One of the conductive fabric electrodes is shared by the wind driven TENG(W-TENG)and S-TENG.The unique structure design enables W-TENG to improve the voltage output of S-TENG.The fast fourier transform(FFT)of electrical signal is analyzed and verified.The output performance of the hybridized TENG under the action of wind and sound wave is systematically studied.When the wind speed is 10 m/s,the maximum open circuit voltage of W-TENG is 530 V,the short-circuit current is 10.5 μA,and the optimal instantaneous output power is 1.5 m W.At the sound frequency of 180 Hz and sound pressure of 115 d B,the corresponding electrical output of S-TENG is 80 V,19 μA and 0.5 m W,respectively.Besides,a special power management circuit is designed to reduce matching impedance and improve energy utilization efficiency.Two digital temperature-humidity meters are successfully driven by the hybridized TENG which is managed by power management circuit.This work not only provides a simple and easy way to obtain the energy of wind energy and acoustic environment,but also can effectively improve the energy output and make it develop towards the direction of sustainable and clean energy practical application.Breeze is ubiquitous in people’s living environment and the energy is easily ignored.However,previous studies mainly focused on harvesting wind energy with high wind speed,thus,it has great practical significance to design a device with reasonable structure to harvest wind with low speed.In the second work of this paper,a kind of TENG based on flutter-effect is fabricated,which polytetrafluoroethylene(PTFE)as flutter plate can effectively make silicon ball quiver in wind.When the wind speed is 5 m/s,the open circuit voltage,short circuit current and the optimal instantaneous output power of the TENG driven by silicon ball are 200 V,10 μA and 0.4 m W,respectively.The device can effectively harvest the energy in the breeze,and has a simple structure and beautiful shape,which have potential applications in Internet of Things and sensors.