A hybrid piezoelectric nanogenerator comprising of KNN/ZnO nanorods incorporated PVDF electrospun nanocomposite webs

Abstract

A unique potassium sodium niobate (KNN)/zinc oxide (ZnO) incorporated Poly(vinylidene fluoride) (PVDF) polymer-based hybrid piezoelectric nanogenerator has been developed by using electrospinning process.Electrospinning method has been used due to its remarkable role in improving the piezoelectric performance of the nanocomposite based nanogenerator by providing mechanical stretching and in situ poling of both the polymer as well as filler at the same time. The PVDF/KNN/ZnO electrospun nanocompositebased piezoelectric nanogenerator exhibits the maximum output voltage as compared to PVDF/KNN and PVDF/ZnO based nanogenerator. The output voltage and current for the PVDF/KNN/ZnO based nanogenerator are 25 V and 1.81 μA (when pressure is applied by the finger tapping mode) and 8.31 V and 5 μA (when pressure is applied by standard sewing machine). The synergistic effect of KNN and ZnO nanorods into PVDF polymer matrix significantly improves the resultant piezoelectric performance of the PVDF/KNN/ZnO based nanogenerator by which it has been possible to glow an LED, power density of 11.31 μW/cm 2 (finger tapping) and 10.38 μW/cm 2 (pressure applied by sewing machine). Finally, the practical applicability of the produced nanogenerator has been checked by attaching it on elbow and wrist of a human hand, which shows 90 mV (for elbow), 400 mV (front side of wrist), and 225 mV (back side of wrist) output voltage by bending and moving of the same. K E Y W O R D Sbeta nucleation, in situ poling, nanofibrous web, nanorods, piezoelectric, PVDF/KNN/ZnO hybrid structure

Eggshell membrane and expanded polytetrafluoroethylene piezoelectric‐enhanced triboelectric bio‐nanogenerators for energy harvesting

“…To resolve this problem, the triboelectric nanogenerator (TENG) was first proposed in 2012 by Zhonglin Wang 1 . TENGs have the ability to harvest natural mechanical energies, 2,3 such as wind energy, 4,5 water wave energy, 6 human body motions, 7‐9 traffic noises, etc., and convert them into electricity. Human itself is not only a rich source of mechanical energy, such as walking, running, joint motion, blood flow, and heart beats, but also the application terminal of wearable electronics; it is an ideal scheme to collect human energy and supply power for wearable electronics.…”

Flexible piezoelectric cum‐ electromagnetic ‐absorbing multifunctional nanocomposites based on electrospun poly (vinylidene fluoride) incorporated with synthesized porous core‐shell nanoparticles

“…27 The phases α and ε are non-polar and β, γ, δ are polar. [28][29][30] Thermodynamically, the α phase is the most common crystalline structure of PVDF at room temperature and pressure. 31 However, the β phase has gained increasing attention due to its higher dipole moment and hence improved piezoelectric properties.…”

“…PVDF is generally found in five crystal forms: α, β, γ, δ (or Polar α) and ε 27 . The phases α and ε are non‐polar and β, γ, δ are polar 28‐30 . Thermodynamically, the α phase is the most common crystalline structure of PVDF at room temperature and pressure 31 .…”

An investigation into size‐dependent dynamic thermo‐electromechanical response of piezoelectric‐laminated sandwich smart nanocomposites

“…Inspired by the booming development of smart materials and electronic technologies, piezoelectric laminated sandwich smart nanocomposites have been widely used as the high-efficient nano-electromechanical devices, such as graphene/piezoelectric sandwich films, 1 sandwich nanoplates with two piezoelectric face sheets, 2 and TiO 2 TiO2/ZnO/TiO2 sandwich multi-layer films. 3 Ever since the advent of the ultralong belt-like nanobelts made of semiconducting oxides (eg, zinc, indium, tin, gallium, and cadmium), 4 there have been great achievements of smart piezoelectric nanocomposites in the energy generator/harvester system, such as micro-generator, [5][6][7] such as nano-generator, voltage booster, and storage element. Nanoenergy harvesting stands as a new technique, which can be used to convert ambient energy into useful electricity.…”