Research On Instantaneous Triboelectric Nanogenerator For Real-time Power Supply Of Sensors

With the further popularization of technologies such as the Internet of Things,big data,and cloud computing,the application scope of mobile wireless electronic products has been expanded,and it has become increasingly important to find suitable power sources for them.As an energy harvesting technology that can convert irregular and dispersed mechanical energy from the human body and surrounding environment into electrical energy,the triboelectric nanogenerator(TENG)provides a new type of environmentally friendly energy for meeting the power supply needs of mobile electronic devices.However,compared with commercial constant voltage power supplies,the TENG,as a power supply for sensors,still faces problems such as low sensor response and unstable output signals,which constrain its application.This paper proposes a new power supply method for an instantaneous triboelectric nanogenerator(i-TENG),which can provide real-time power to sensors without compromising their response performance.Compared with the power supply method of the traditional TENG,this new strategy can improve sensor response performance by 5-7 times,which is equivalent to a commercial constant voltage power supply.The paper theoretically analyzed that the output of the t-TENG is related to the external load,so when it is used as a power supply for resistance-changing sensors,the voltage output of the generator will also change when the sensor resistance changes,resulting in a much lower sensor response performance than that of a constant voltage power supply.Based on a detailed analysis of this problem,an i-TENG is designed.Subsequently,the feasibility of this power supply strategy is verified through dynamic simulations,and it is found that the output voltage of the i-TENG does not change with external load or motion speed.Finally,the sensor response performance supplied by the i-TENG is better than that of the t-TENG.On this basis,the advantage of this i-TENG power supply strategy is verified by experiments.Firstly,the i-TENG and the t-TENG were designed,and then their basic properties were tested.The experimental results show that the output voltage of the iTENG is independent of the external resistance value and the contact separation speed of the plate.At the same time,we tested the charging of different capacitors by two TENGs,and found that the charging efficiency of i-TENG is higher,up to 2.4 times that of t-TENG.In addition to the above experimental tests,more importantly,the performance of the two TENGs to supply power to the sensor was tested.In this paper,the ultraviolet sensor made of a single Zn O microwire is taken as an example,and two TENGs are used to power it respectively.The test results show that the sensing performance of the ultraviolet sensor powered by the i-TENG can reach 90% of the sensor powered by the constant voltage power supply.The performance is 6 times that of the t-TENG.