High-performance Flexible Piezoelectric Yarn for Mechanical Energy Harvesting

摘要

The development and popularity of wearable electronics increase demand for wearable energy harvester that can scavenge energy from environment or human body movements.In this paper,we present a novel yarn as wearable piezoelectric nanogenerator(PNG)consisting of a layer of electrospun poly(vinylidene fluoride)(PVDF)nanofibers integrated with PVDF film around a silver deposited nylon filament acting as inner electrode.The resultant unique yarn produced an average peak voltage of 0.52V,peak current of 18.76nA,and power density of 5.54iiW/cm3 under a cyclic compression of 0.02MPa at 1.85Hz,which is significantly higher than the energy output of a yarn with only a PVDF elelctrospun nanofibrous layer.More importantly,the high performance was retained after 50,000 cycles of compression.The flexible yarn-based piezoelectric nanogenerator(PNG)device with good energy output and durability demonstrated its great potential to be used as wearable energy harvester.