Performance And Application Of Triboelectric Nanogenerators Based On Polymer Melt Blowing

The shortage of traditional fossil energy has caused widespread concern in today's society.It is a common concern of all countries in the world to find and develop sustainable and renewable energy.As a kind of renewable energy,mechanical energy is abundantly available in our daily surroundings,therefore converting mechanical energy in the environment into electricity is considered to be a promising renewable energy conversion technology.The triboelectric nanogenerator(TENG)is a new energy conversion method based on the principles of triboelectric and electrostatics to effectively convert the mechanical energy in the environment into electrical energy.In order to enhance the contact intimacy of triboelectric layers,sophisticated techniques have been employed.While fine TENG devices could be fabricated,unfortunately,it is still a challenge to fabricate low-cost,durable and large-area TENG by a facile,continuous and environmentally friendly method for further applications.Therefore,fabrication strategies with aforementioned features are urgently developed.As well known,melt blowing,a common technique for fabricating non-woven fabrics with high specific area,possesses many advantages.For example,it can realize solvent-free,large-scale and recyclable production at low cost.In this paper,via melt blowing technique enabling solvent-free,large-scale and recyclable production at low cost,we assembled a fabric-based TENG(FB-TENG)which enables effective energy harvesting and self-powered sensing.The main research and results are as follows:(1)In this paper,the low-cost and easy-to-process polypropylene(PP)is used as the raw material,and the solvent free and feasible melt blowing technique is adopted to realize the large area and continuous fabrication of PP non-woven fabrics with different fabric weight.FB-TENG was constructed in conjunction with PA-66 fabrics and conductive fabrics which all have been industrialized.The effect of the fabric weight of PP non-woven fabrics on FB-TENG output performance was investigated,and FB-TENG containing PP-NWF with fabric weight of 60 g/m~2 shows the optimal electrical output performance.The friction cycle test indicates that the optimal FB-TENG show excellent stability.Moreover,the absolute output performance of FB-TENG increases monotonously with the increase in the area of triboelectric layer,while the larger triboelectric layer leads to lower current and charge density.The output voltage,current density and power density under different external resistance of 10~3-10~9?at a force with frequency of 6 Hz is also investigated.With the increase of connected external resistance,the output current decreases but the output voltage increases.And the maximum output power density of 901.7 m W/m~2 occurs at an external resistance of 70M?.In addition,as the external force frequency increased from 1 Hz to 6 Hz,the open circuit voltage and short circuit transfer charge of FB-TENG almost remain unchanged at 210 V and 100 n C respectively,while the short circuit current of FB-TENG gradually increase from 8?A to 28?A.Finally,the effect of humidity on FB-TENG output performance is investigated.The results show that with the relative humidity of air increaseing from 45%to 75%,the output performance of FB-TENG show a significant decreasing trend.(2)The application of FB-TENG in nano-energy field is investigated.On the one hand,the FB-TENG has a good charging capacity for the capacitor.On the other hand,FB-TENG can not only light up light-emitting diodes(LEDs),but also drive electronic watch.Moreover,thanks to the large area continuous preparation of PP non-woven fabrics,a large-area FB-TENG for pedestrian volume collecting and large area energy collection is constructed,and the wireless synchronous display of the collected signals on mobile terminals such as mobile phones is also realized with the help of the network.It is found that the FB-TENG based self-powered pedestrian volume collector system has extremely short response time(44.4 ms)and recovery time(84.5 ms).Moreover,the self-powered pedestrian volume collector system achieve a long period of continuous collection.Furthermore,the FB-TENG based pedestrian volume collector can not only collect pedestrian volume but also harvest mechanical energy.In addition,thanks to the flexibility of FB-TENG,a flexible FB-TENG that can be applied to the surface of props for boxing training monitoring is constructed.The self-powered pugilism training monitor realize the wireless synchronous display of collected signals on mobile terminals such as mobile phones.FB-TENG in this state had shorter response time(13.4 ms)and recovery time(12.3 ms).Moreover,the training monitoring system has a fast response to the external pressure,and can accurately identify the strength,speed and the quantity of punch.