నైరూప్య

Energy harvesting based on environmentally-friendly perovskite piezoelectric nanofibers

Mohammad Bagher

Since the first demonstration on nanogenerators using piezoelectric ZnO nanowires for converting mechanical energy into electricity, a great interest has been excited worldwide for developing various approaches for energy harvesting. The key idea of these efforts is the self- powered nanotechnology, aiming at powering nano-devices using the energy harvested from the environment. Compared to the bulk counterpart, the piezoelectric nanofibers have the advantages of lightweight, small-size, high elastic compliance, and high strain tolerance which lead to high sensitivity caused by small and random ambient mechanical movements. Considering the relatively low piezoelectric constant and electromechanical coefficient of ZnO, which potentially hinder the supply of sufficient power for certain applications, energy harvesters based on perovskite piezoelectric materials with high charge constant were suggested. The proposed research aimed at development of energy efficient and environmentally-friendly nanofibers based on emerging lead-free piezoelectric materials. Particular focus was placed on (Bi0.5Na0.5)TiO3 system. BNT is known as one of the most important lead-free and strong ferroelectric materials discovered in 1960, which has an ABO3 distorted perovskite structure. A facile hydrothermal technique was employed and optimized to synthesis the BNT nanofibers. Structural and electrical properties as well as the nanoscale electromechanical response of the nanofibers have been systematically characterized. It is indicated that single crystal BNT nanofibers were synthesized successfully by electrical properties superior and comparable with other one-dimensional piezoelectric materials.

The improvement of inexhaustible and manageable vitality sources dependent on naturally clean materials that can create power by using encompassing copious energies is a significant advance for saving the worldwide condition just as empowering supportable monetary development. The ongoing rise of natural inorganic metal halide perovskite based sunlight based cells has changed photovoltaic innovation with remarkable high paces of intensity transformation e?ciencies. Albeit sunlight based vitality is su?ciently high for the vitality reaping, the unexpected changes in natural conditions including climate changes and time-subordinate variables can signi?cantly a?ect the e?ciency of sun oriented cells. Piezoelectric nanogenerators (PENGs) may not deliver higher energies contrasted with sun based energies, however they have been an ongoing point of convergence of research because of their potential capacity to reap vitality from the encompassing condition through biomechanical development. The fundamental trademark highlights of piezoelectric materials, for example, delicate, lightweight, ?exible, and eco-accommodating nature permit their more extensive pertinence in an assortment of ?exible, wearable and bio-clinical electronic gadgets. These essential highlights force difficulties for inorganic earthenware materials due to their high temperature preparing, weakness and poor mechanical steadiness. Natural inorganic lead halide perovskite materials have as of late got broad consideration for use in different gadgets, for example, photovoltaics, light-discharging diodes (LEDs), and resistive randomaccess memory (ReRAM). Notwithstanding these applications organometal-halide perovskites have as of late been routed to the piezoelectric applications. A far reaching survey on piezoelectric vitality gathering advances was performed by the creators in 2007. In any case, numerous novel methodologies have been created since 2007 so as to improve material properties, transducer designs, electrical interfaces, prescient models, and the application space of piezoelectric vitality gathering gadgets.