Vibration energy harvesting and internal electric potential of (Na,K)NbO₃/polyimide piezoelectric composites

Abstract

A composite structure of piezoelectric particles and soft polymer composite materials is a promising component of vibration energy harvesters. However, the energy harvesting behavior which originates from ceramic particles inside the polymer has not been clarified. In this study, (Na,K)NbO 3 /polyimide composites sheets with NKN fraction of 0-40 vol% were fabricated and open-circuit voltage was measured. The opencircuit voltage was increased nonlinearly from 0.72 to 2.21 V with increasing of the particle fraction (10%-30%) The experimental results were confirmed using a microstructure based finite element method and electric potential and electromechanical coupling coefficients were higher value in the content of 30% NKN particles. Analysis indicates that the internal electric potential inside the matrix under strain could be an important factor for macroscopic piezoelectric constant and electrical output.

Characteristics of small-scale piezoelectric vibration energy harvesting device for rotating structures

“…However, the minimal deformation of silicon substrate under certain loads, owing to its large stiffness, limits its ability to generate significant electrical output for piezoelectric energy harvesting. In contrast, polyimide flexible substrates can adapt to various curved surfaces, making them highly advantageous for specific applications such as wearable electronic devices and biomedical sensors [10] . This flexibility is typically lacking in silicon substrates, which are more brittle.…”

An implicitly coupled finite element-electronic circuit simulator method for efficient system simulations of piezoelectric energy harvesters

“…Often, the finite element method (FEM) is applied for the simulation of PVEHs and allows to solve the full set of 3D piezoelectric equations (Hegendörfer et al, 2022a; Yamamoto et al, 2021). FEM simulations of electromechanical structures are coupled with linear passive electric circuit elements in Wang and Ostergaard (1999), Zhu et al (2009), De Marqui Junior et al (2009), Abdelkefi et al (2014), Akbar and Curiel-Sosa (2019), and Ishihara et al (2021).…”

Young’s modulus and ferroelectric property of BaTiO3 films formed by aerosol deposition in consideration of residual stress and film thickness

“…7,8) For instance, vibration energy harvesting converts ambient vibrations into electrical energy. [9][10][11][12] Using this method, it would be possible to generate electrical energy from minute vibrations caused by water droplets, vehicles, and sound. 13,14) Piezoelectric materials can convert mechanical energy into electrical energy and have the potential to drive sensors despite their small size.…”