Influence of Various Physiochemical Parameters of AFeO₃ (A = Bi, Er, Ga, La, Sm, Y) Fillers on the Dielectric, Ferroelectric, Energy Storage, and Mechanical Energy Harvesting Performance of PVDF

Abstract

Different filler particles are very often used by researchers all over the world to tune the dielectric, ferroelectric, piezoelectric, energy storage, and energy harvesting properties of poly(vinylidene fluoride) (PVDF). In the present work, different perovskite ferrites, AFeO 3 (A = Bi, Er, Ga, La, Sm, and Y), are included into PVDF matrix separately. The roles of different parameters like, particle size, dielectric permittivity, ferroelectric polarization, crystal structure, etc. of the fillers in tuning the performance of respective PVDF-based composites are comprehensively and simultaneously studied here. Non-centrosymmetric fillers are found to improve the output performances of PVDF more effectively compared to that of centrosymmetric fillers. 5 wt% BiFeO 3 -loaded PVDF film (5BF) shows the best performance in all aspects. Upon repeated human finger tapping, the maximum instantaneous output power density and instantaneous current across a 10 MΩ resistor connected across the 5BF film are found to be ≈3 μW cm −2 and 1.25 μA, respectively. The rectified voltage from 5BF nanogenerator is used to charge a 10 μF commercial capacitor up to ≈2.8 V and lights up some LEDs as a part of its real life applicability. The fabricated nanogenerator also shows good vibration and pressure sensing ability.

Tuning the Electromechanical Response of P(VDF-TrFE)/ZnSnO3-Based Binary Piezoelectric Composites for Biomechanical Energy-Harvesting and Self-Powered Mechanosensing

“…On the other hand, the dielectric permittivity renders a negative effect on the piezoelectric energy-harvesting performance of a PENG. The output voltage ( V Out ) of a PENG can be presented by eq as given below V out = prefix∫ d 33 ε 0 ε normalr ε ( l ) E · normald l …”

Electroactive properties and piezo-tribo hybrid energy harvesting performances of PVDF-AlFeO3 composites: role of crystal symmetry and agglomeration of fillers

“…Then it was dried at 90 °C for ∼16 h. The dried precipitate was then calcined at 700 °C for 1 h in order to obtain rhombohedral AlFeO 3 (AFRH). On the other hand, in order to obtain orthorhombic AlFeO 3 (AFOR), another citrate-gel synthesized dried gel 31 was calcined at 1350 °C for 2 h.…”

“…Moreover, there are a few reports where GaFeO 3 has been used as a filler in PVDF. [29][30][31] On the other hand, AlFeO 3 has been comparatively less studied. Moreover, except for one recent report of a PDMS-based piezoelectric nanogenerator, 32 the use of AlFeO 3 in the PVDF matrix has been very rarely explored.…”

Supersonically Sprayed Cobalt Titanate and PVDF for Flexible Piezoelectric Nanogenerators

“…In contrast, a smaller number of low dielectric constant fillers are appropriate for the PVDF matrix to fabricate PENGs [28]. Moreover, fillers with a high dielectric constant are more susceptible to electrical breakdown; hence, the use of fillers with a low dielectric constant in PVDF has attracted considerable attention from the research community [28,29].…”

“…In contrast, a smaller number of low dielectric constant fillers are appropriate for the PVDF matrix to fabricate PENGs [28]. Moreover, fillers with a high dielectric constant are more susceptible to electrical breakdown; hence, the use of fillers with a low dielectric constant in PVDF has attracted considerable attention from the research community [28,29]. Recently, transition metal (M) titanates (where M = Fe, Mn, Ni, or Co) as fillers in PVDF have gained attention for improving PENG performance in terms of higher piezocurrent and power.…”