The Structure Design Of Triboelectric Nanogenerator And Its Application In Environmental Energy Harvesting And Self-powered Sensing

Since the invention of triboelectric nanogenerator(TENG),it has attracted worldwide attention due to numerous advantages of simple fabrication,light weight,low cost and high output performance at low frequency.In recent years,the invention of wind-driven triboelectric nanogenerator(WD-TENG)provides a new strategy to harvest wind energy efficiently.But the output performance of existing WD-TENG still has a high room to improve.On the other hand,the main strategy for powering wearable electronics is employing energy storage units such as batteries or supercapacitors.However,because of the limited lifetime,they require usual recharging,displacement and recycling,which can consume numerous resources.Moreover,as people pay more attention to their own health,it is preferable for human to monitor their health status in real time by their electronics.Under this circumstance,designing a novel wearable TENG to scavenge mechanical energy from human motion in order to monitor body moving state has profound implications.Based on literatures,this essay put forward some specific solutions for the above problems,as flows:1.Design angle-shaped triboelectric nanogenerator(AS-TENG)for wind energy harvesting.In this part,An AS-TENG is designed for wind scavenging especially natural weak wind.Based on this device,the middle fluttering film can contact fully and intimately with two electrodes.Compared with the existing parallel-structured WDTENG,the AS-TENG shows and over-whelming output performance and the improved harvesting efficiency.Furthermore,a wedge-shaped wind guide channel is introduced,which can provide a driving force for the flutter and hence lower the start-up wind speed largely.Finally,the AS-TENGs can be facilely integrated into a 360° radical array,exhibiting an enlarged windward area and a high level of integration.2.Based on the AS-TENG,a self-powered active wind speed sensor was designed.The frequency of output current is chosen as the key parameter,and the relationship between wind speed and frequency can be built by analyzing the electrical signals systematically.After C language programming,the visualization of wind speed sensing results can be realized.By comparing with a commercial hot wire anemometer,this device demonstrates the potential of the self-powered sensor for wind speed detection.3.Seesaw structured triboelectric nanogenerator(SS-TENG)with enhanced output performance and its applications in self-powered motion sensing.Thanks to this structure,the relative velocity between two triboelectric layers can be increased,resulting in the improving output performance.Furthermore,the electric signals of the SS-TENG can be tuned by structure modification,which can be utilized to monitor the motion of object and human body.After employing C programming,the output signals can be identified and logically analyzed through computers,enabling visual display of sensing results for practical applications.