| The exploration and utilization of energy is the key driving force to promote social development,and the phenomenon of triboelectricity is widespread in our daily life.If the energy generated by triboelectricity can be used,it will be a beneficial supplement to the development of green energy.As an energy conversion device,triboelectric nanogenerators(TENGs)are based on the coupling principle of triboelectric effect and electrostatic induction,with a wide range of materials and low production costs.Compared with electromagnetic induction generators,TENGs have certain advantages in the field of low-frequency energy harvesting.At the same time,the demand for sensors continues to grow,but most of the existing sensors require external power supply,which will cause a certain waste of resources.Based on the above current situation,this paper proposes a freestanding-triboelectric-layer-based rotational triboelectric nanogenerators(FR-TENG).In addition,according to the structure and principle of FR-TENG,a self-powered slip sensor is designed and prepared.The main content and innovation are as follows:(1)Designed and prepared freestanding-triboelectric-layer-based rotational triboelectric nanogenerators(FR-TENG),using silicone rubber(Ecoflex00-30)and aluminum as the dielectric layer material,and the two continuously contact and separate during operation to generate periodic alternating current.a theoretical model is established,and its working principle is analyzed.The COMSOL Multiphsics software is used to simulate the electric potential distribution during the operation of FR-TENG.Compared with the previous freestanding triboelectric-layer-based nanogenerators,FR-TENG based on the belt-wheel structure can collect mechanical energy in the form of rotation and sliding,and its application scenarios are more extensive.(2)The electrical output performance of FR-TENG was tested in both continuous discharge mode and instantaneous discharge mode.When FR-TENG is in continuous discharge mode,the output voltage and output current peak value is about 232 V and 5.2μA at a speed of300 rpm,and its output voltage and output current increase with the increase of speed.When the external load is 50 MΩ,the output power is up to the maximum value is about 0.328 m W.The output voltage and current of FR-TENG will decrease as the failure area of the aluminum electrode increases.When the failure area reaches 30%,the output voltage and current will drop to 180 V and 2.6μA,respectively.The surface microstructure of FR-TENG dielectric layer can improve its output performance.The microstructure of the dielectric layer based on 400#and1200#sandpaper can make FR-TENG’s peak output voltage reach 256 V and 288 V,and the peak output current can reach 6.4μA and 6.8μA,respectively.When FR-TENG is in the instantaneous discharge mode,the output voltage reaches 1260 V,which is much larger than the continuous discharge mode,and the peak value of the output voltage hardly changes with the rotation speed.(3)Based on the structure and principle of FR-TENG,a self-powered slide tactile sensor is designed,and the feasibility of detecting the sliding speed and distance of the object is analyzed.The output voltage peak value of the sensor and the sliding speed of the measured object are approximately linear(R~2=0.998),The sensitivity is 15.59 m V/mm/s,and the sliding distance of the measured object can be obtained according to the number of pulses of the output voltage signal.At the same time,since the sensor generates a voltage signal when the measured object is loaded and unloaded,the influence of the signal generated when the measured object is loaded and unloaded on the slip detection is also analyzed.In addition,a non-contact mode is proposed to further simplify the structure of the sensor. |
PDF Full Text Request