Preparation And Performance Study Of Wearable-oriented Flexible Energy Harvesting Devices

In recent decades,with the growing energy shortage and the increasing number of mobile electronic devices,research on self-powered,sustainable green energy is imminent.In recent years,the collection of random mechanical energy wasted in daily life into electrical energy has become a major direction of research.Frictional nanogenerators are a new type of energy harvesting device capable of converting various mechanical energies in the surrounding environment into electrical energy,and they have been rapidly developed because of their high efficiency in energy harvesting,low cost and self-powered sensing.Vertical contact-separation mode triboelectric nanogenerators have become one of the most commonly used modes of operation due to their simple design,high instantaneous output power,and easy multilayer integration.So far,triboelectric nanogenerators based on flexible textiles can collect both human motion energy and random mechanical energy due to their good human adaptability,bendability and wear resistance.However,the electrical output performance of most flexible TENGs is not excellent,and there has been a lack in the aspect of growing nanomaterials on textiles to improve the output performance of TENGs.Meanwhile,triboelectric nanogenerators have been designed for a variety of applications,but there is a lack of stochastic energy harvesting for some harsh environments.In this paper,we investigate the preparation and performance of wearable flexible energy harvesting devices,the effect of growing nanomaterials on flexible materials on TENG performance,and the design of energy storage system and TENG combination.It mainly includes.1.a durable and washable textile TENG is demonstrated on textiles by a simple,easily scalable and low-cost method.sandpaper can be used as a template for surface roughness to expand the effective contact area.the TENG shows good performance,with devices having0.05 wt.%MG and 1.0 mm thickness exhibiting the highest electrical output power with V_oc,I_sc and power density values of 200 V,20μA and 1.3 m W（16 N and 5 Hz）,respectively.As an energy harvester,capable of converting mechanical energy from various human activities into electrical energy,it can be applied to flexible and miniature green electronics.2.A stretchable and washable self-charging power system is designed to collect and simultaneously store random mechanical energy from the human body.The energy harvesting unit（FC-TENG）shows excellent energy conversion performance with a maximum power density of 816.7μW·m^-2 at a load resistance of about 10⁷Ω.The fast charging capability and excellent stability of the flexible supercapacitor enable it to be an efficient energy storage unit for TENG.The integrated FC-EHSS can be simply mounted on a shoe insole as a wearable human motion monitor that can accurately display motion status and capture mechanical energy from human motion.