Ultra-Fine Gold Nanoparticles Enabled Au-BST NF/PVTC Composites to Have Excellent Energy Storage Performance

Abstract

Composites composed of a polymer matrix and inorganic fillers have attracted tremendous attention owing to their promising application in flexible dielectric film capacitors. However, boosting the energy density while ensuring a high charging-discharging efficiency is still a huge challenge. In this work, Ba0.6Sr0.4TiO3 nanofibers (BST NFs) doped with different contents of ultra-fine Au nanoparticles are precisely prepared by one-step electrospinning, and P­(VDF-TrFE-CFE) (PVTC)-based composites incorporated with various nanofibers are further prepared via a solution-casting process. A superior discharged energy density of 14.2 J/cm3 and an excellent energy storage efficiency of 71.3% have been achieved in such monolayer composites by optimizing the doping content and distribution of ultra-fine Au nanoparticles in BST NFs, which are induced by enhanced electric displacement and ensure suppressed energy loss and improved electric breakdown strength. Hence, doping moderate ultra-fine metal nanoparticles in one-dimensional inorganic nanofillers is a feasible strategy for designing polymer-based composites with outstanding performance.

Flexible PVDF–TrFE Nanocomposites with Ag-decorated BCZT Heterostructures for Piezoelectric Nanogenerator Applications

“…A two-parameter statistical Weibull distribution was used to evaluate the breakdown strength, as shown in Figure 7c. This distribution can be described by the following equation: 51 Ä where FoM 33 is a piezoelectric energy harvesting figure of merit, d 33 is the piezoelectric charge coefficient, ε 0 is the permittivity of free space, and ε 33 T is the relative permittivity at constant stress. It can be seen from Figure 7f that the FoM 33 increased from 3.82 × 10 −12 to 5.68 × 10 −12 m 2 /N with increasing Ag nanoparticle loading content and then begins to decrease, where the highest value is achieved by the sample of 0.04Ag-BCZT NWs/PVDF−TrFE composite film; this value is 49% higher than that of pure BCZT NWs/PVDF−TrFE composite film.…”

“…A two-parameter statistical Weibull distribution was used to evaluate the breakdown strength, as shown in Figure c. This distribution can be described by the following equation: P ( E ) = 1 − [ − ( E E b ) β ] where P ( E ) is the cumulative probability of electric failure, E is the measured electric breakdown strength, E b represents the characteristic breakdown strength when P ( E ) is 0.632, and β is the shape parameter. The electric breakdown strength E b and shape parameter β of Ag-BCZT NWs/PVDF–TrFE composite films are summarized in Figure d.…”

Interesting Influence of Different Inorganic Particles on the Energy Storage Performance of a Polyethersulfone-Based Dielectric Composite

“…For comparison, the η and E b values of some representative polymer matrix dielectric composites studied in the past 2 years are shown in Figure . ,− It should also be noted that in this work, we achieved a good E b and an excellent η and also systematically studied the application of PESU in the field of energy storage. Hopefully, this novel research might open up a new road to obtain dielectric nanocomposites with excellent performances for mass production.…”

Vertical Cylinder-to-Lamella Transition in Thin Block Copolymer Films Induced by In-Plane Electric Field

“…We know that the chloroform vapor treatment is enough to observe morphological transformations in the film, however, it is not surprising that the standing cylinders cannot be fully replaced with lamellas even at long annealing times. Adding 5% of Au nanoparticles increases the static polymer permittivity about 1.5 times [85][86][87]. If the value of ε 1 in the PS-P4VP/AuNR composite attains 6.0, while ε 2 persists at 2.6, then the above morphology transformation increases the electrostatic term in the free energy by 9% only.…”

“…Doping by Au nanoparticles was reported to markedly increase the low-frequency dielectric permittivity of poly(vinylidene fluoride) [85], vinylidene fluoride-trifluoroethylenechlorofluoroethylene terpolymer [86], and SU-8 epoxy novolac resin [87], being attributed to the polarization of conductive particle interfaces within the dielectric polymer matrix, known as the Maxwell-Wagner-Sillars effect [88]. Since in our case the AuNRs are selective to the P4VP blocks [80,81], they increase the permittivity of the corresponding domains thus making the dielectric contrast with PS domains even higher.…”