Study On The Preparation And Performance Of The Triboelectric Nanogenerator Based On The Nanofiber Membranes

Triboelectric nanogenerator(TENG)can effectively harvest mechanical energy from the ambient environment,which is attracting the attention of the researchers from all over the world,and has become an important emerging force in the field of self-powered wearable electronics.In this paper,the flexible nanofiber membranes that prepared by the electrospinning method were used to design and develop two types of nanofiber-based TENG,which based on the crumpled graphene structure and the vapor polymerization of the conductive polymer poly(3,4-ethylenedioxythiophene)(PEDOT).1.A flexible and stretchable single-electrode TENG based on the crumpled nanofiber membrane was presented.The reduced graphene oxide(RGO)was serviced as the electrode material due to its outstanding electrical conductivity and mechanical flexibility.The poly(vinylidene fluoride-co-hexafluoropropylene)(PVDF-HFP)nanofiber was used as the triboelectric material due to its strong electronegativity and ultra-high specific surface area.Its output voltage and current could achieve at 80 V and 1.67 ?A with the real contact area of 3 cm × 3 cm.The whole device was demonstrated to be a dependable power source,which could be utilized to light up 30 connected in series green LEDs.In addition,it could also be used as a wearable sensor to realize a real-time monitoring of the human motion status.Moreover,creatively introducing crumpled structure onto the TENG results in excellent stretchability for the entire device.The output voltage and current could achieve at 300 V and 7 ?A under the tensile strain of 150%.Particularly,the crumpled structure could firmly grasp the PVDF-HFP nanofiber membrane and stably attach it onto the graphene electrode.It is overcoming the deficiency that nanofiber membrane has a tendency to be delaminated during long-term operation,which ensuring the durability of the entire crumpled nanofiber-based TENG.2.A flexible and breathable vertical contact-separation TENG based on the Janus conductive nanofiber film was presented.The polylactic acid(PLA)and PVDF-HFP were used as positive and negative triboelectric materials due to their electronegativity,porous structure,and ultra-high specific surface.The vapor-phase polymerized PEDOT-coated conductive nanofiber films were used as the electrode material.Its output voltage and current could achieve at 140 V and 3.67 ?A with the real contact area of 2 cm × 2 cm.The whole device was demonstrated to be a dependable power source,which could be utilized to light up 60 connected in series green LEDs and drive a calculator runs normally.In addition,it could also be used as an ultralight and breathable wearable sensor to realize a real-time monitoring of the human motion status.Moreover,compared to the dense membrane that used in the traditional TENG,this flexible Janus conductive nanofiber film is ultralight and porous with a rough surface topography.It has great application potential in the field of flexible wearable self-powered devices.