Piezoelectric device operating as sensor and harvester to drive switching circuit in LED shoes

Piezoelectric Energy Harvesting Based on Multiaxial Ferroelectrics by Precise Molecular Design

“…[1][2][3][4][5] The spontaneous polarization and piezoelectric effects of ferroelectrics have promoted the development of many optoelectronic devices in the field of light-emitting diodes, solar cells, nanorobots, and self-powered systems. [6][7][8][9][10][11] In particular, Wang et al have reported a series of nano-ZnO-based films, nanowires, and nanorod arrays, whose piezoelectric polarizationinduced built-in electric fields can promote carrier recombination and separation improving quantum efficiency and photocatalytic activity, which can be applied in nanogenerators, photocatalysis technology, flexible electronic skins, etc. [12][13][14][15][16] Furthermore, the spontaneous polarization of ferroelectrics can be switched in response to an external electric field, making them attractive for wide applications of ferroelectric memory, temperature sensing, energy harvesting, and optoelectronic devices.…”

Multimodal Hybrid Piezoelectric-Electromagnetic Insole Energy Harvester Using PVDF Generators

“…Ankle strap/ wrist worn 1.5 3-axis wireless motion tracker, Seizure activity [19] Biomechanical energy harvesting is an increasingly research-attractive interest for achieving autonomy in health monitoring applications, due to the more efficient and conveniently available energy from body kinematics and kinetics [20]. Limb movements and mainly heel strike, which provides mechanical vibrations of considerable acceleration levels and frequency content [21], as summarized in Table 2, can be harvested constantly and ubiquitously as a sustainable power supply, to make wearable electronics self-powered; a challenging task to be solved [22].…”

Analytical and numerical fluid–structure interaction study of a microscale piezoelectric wind energy harvester

“…However, the need for regularly replacing or recharging batteries makes their application costly and cumbersome. Due to these concerns, technologies capable of generating electrical power by harvesting environmental energy have been considered as a promising alternative for batteries, especially for autonomous devices operating for long periods with no human intervention, 3–6 and various types of such technologies have been developed for harvesting energy from different sources like solar power, thermal gradients, mechanical vibrations, and air and water flows 7,8 …”

“…In the first group, flow phenomena such as galloping, 1,13 vortex shedding, 14,15 and flutter 6,16 are used to induce beam vibration. A variety of mechanisms such as piezoelectricity, 4,14 triboelectricity, 11,16 and electromagneticity 6,12,15 have been proposed in the literature to convert mechanical energy from beam vibrations into useful electrical energy. Among these mechanisms, the one based on piezoelectric method is the most appealing candidate, because piezoelectric harvesters are simple, easy to manufacture, economic, and capable of generating greater power density 17 …”