Abstract
The development of piezoelectric ceramics with high energy conversion efficiency is of decisive importance for the requirements of the advanced energy harvesting devices toward miniaturization and integration. Lead titanate-zirconate (PZT) piezoceramics are the most widely used energy harvesting (EH) materials due to their excellent piezoelectric properties. However, the presence of more than 60% lead in the PZT composition is a serious threat to human health and the environment. Consequently, greater efforts being made to develop lead-free alternatives to PZT-based materials. Here, we propose the Bi0.5(Na0.8K0.2)0.5TiO3 (BNKT) lead-free piezoceramics as a good candidate for the replacement of toxic lead compounds for energy harvesting applications. For that, we have carried out a systematic study of the voltage generation of BNKT-based piezoceramics for (EH) purposes. Specifically, the obtained piezoelectric charge coefficients (d33 = 129 pC/N and d31 = − 12.8 pC/N) and maximum generated output voltage (19.9 V/g) values reveal the good ferro-piezoelectric properties and potential technological applications for energy harvesting of the BNKT–based lead-free piezoceramics. Finally, we consider that the design of new lead-free piezoceramics with superior property coefficients and functionalities, such as the BNKT-based piezoceramics, should be seriously considered as candidates for the replacement of the current toxic lead-based compounds.
Highlights
Energy harvesting is one of the most promising techniques for a wide variety of selfpowered systems
The attention of many researchers has been focused on mechanical vibration as a potential source of energy, since it is accessible through microelectromechanical systems (MEMS), and it is ubiquitous in applications ranging from small household appliances to large infrastructures [3,4,5,6]
This study presents an advance in the lead-free piezoelectric ceramics field, expanding their applications for energy harvesting devices
Summary
Energy harvesting is one of the most promising techniques for a wide variety of selfpowered systems. Our results reveal that the BNKT–based lead-free piezoceramics show adequated effective capacitance and output energy due to more effective performance with a piezoelectric charge coefficient and a maximum generated output voltage as high as 12.8 pC/N and 19.9 V, respectively.
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