High-temperature workable flexible piezoelectric energy harvester comprising thermally stable (K,Na)NbO3-based ceramic and polyimide composites

Energy harvesting of fully-flexible magnetoelectric composites using a piezoelectric P(VDF-TrFE) and magnetostrictive CoFe2O4 nanofiber

“…Each solution was spin-coated three times onto a 2 × 4 cm 2 sized pre-cleaned glass using a spin-coater (ACE-200, Dong Ah Trade Corp.) at 1200 rpm for 15 s, and thermally imidized in the furnace according to the PI heat treatment procedure. After complex heat treatments at 80 °C for 30 min, 200 °C for 10 min, and 450 °C for 10 min, 35 the final magnetostrictive CFO-incorporated PI film (CFO/PI film) with a uniform thickness of approximately 38 μm was peeled off from the glass. A pure PI film was also prepared using the same procedure.…”

Temperature-dependent vibration energy harvesting performance of polyimide/(Na,K)NbO3 piezoelectric composites

“…On the other hand, the energy harvesting properties of the PVDF/NKN Here, Table I shows the thermal property of the PI-based piezoelectric composites and vibration type for the vibration energy harvesting measurement. 11,24,32) From this table, the flexible composite, which is composed of PI matrix and high T c piezoelectric particles, have been attracted as temperaturestable materials. In order to compare the energy harvesting properties with the PI-based composites, types of vibration and their frequency can be important factors, as well as temperature stability range, for the application of vibration energy harvester.…”

“…Numerous studies have selected various lead-free piezoelectric fillers; e.g. BaTiO 3 , 7,8) Ba(Ti,Zr)O 3 , 9) (Ba,Ca)(Ti,Zr)O 3 , (BCTZ), 10) (Na,K)NbO 3 , 11,12) and (Li,Na,K)NbO 3 . 13) Environmental vibration sources can be potentially used for vibration energy harvesting techniques.…”

“…[25][26][27][28] Recently, polyimide/(Na,K)NbO 3 (PI/NKN) composites have been reported owing to their heat and mechanical stability. 11) We have reported the behavior of vibration energy harvesting from the PI/NKN. 29) In this research, the output voltage was experimentally measured, and electric potential and macroscopic electromechanical coupling coefficients were calculated via a finite element method.…”

Diffuse multiphase coexistence renders temperature-insensitive lead-free energy-harvesting piezoceramics

“…In response to the call for accelerating the transformation to clean low-carbon energy and building a new renewable energy system, full and reasonable utilization of ecological energy has become a dominant trend at present. 1,2 Based on the principle of the piezoelectric effect, the piezoelectric energy harvester (PEH) can convert the ubiquitous waste of mechanical energy in the environment into electrical energy and enable some low-power, miniaturized devices such as wireless sensor nodes in the Internet of Things to achieve self-powered behavior, attracting wide attention from academia and industry. 3 For PEH applications, the figure of merit (FOM) directly related to power density is a very significant parameter to evaluate the power-generation capacity of piezoceramics, which is expressed as FOM = d 2 / ε (where d denotes the piezoelectric charge coefficient, and ε denotes the dielectric permittivity).…”