The microstructure of negative electrocaloric Polyvinylidene fluoride-hexafluoropropylene copolymer on graphene loading for eco-friendly cooling technology

Salea, Ahamad; Chaipo, Suphita; Permana, Ardian Agus; Jehlaeh, Kunthisa; Putson, Chatchai

doi:10.1016/j.jclepro.2019.119730

Cited by 13 publications

(2 citation statements)

References 46 publications

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“…Polarization hysteresis loops in the ferroelectric state should be at least with well-expressed saturation of polarization, while in the nonpolar phase, they should have low contribution of dielectric losses. Ignoring these requirements yields disputable results, such as negative ECE, sometimes obtained in Na 1/2 Bi 1/2 TiO 3 -based compositions [22,23,35,36], or physically unrealistically high values of ∆T [37].…”

Section: Introductionmentioning

confidence: 99%

Electrocaloric Effect in (1−x)(0.8Na0.5Bi0.5TiO3-0.2BaTiO3)−xCaTiO3 Solid Solutions at High Electric Fields

et al. 2022

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Recently, promising results were obtained in studies of the electrocaloric effect in thin films. Therefore, research into this effect at high applied electric field values in bulk ferroelectrics is an important task for those scoping out materials that could be appropriate for cooling devices based on the electrocaloric effect. The present study addresses electrocaloric effect in (1−x)(0.8Na1/2Bi1/2TiO3-0.2BaTiO3)−xCaTiO3 solid solutions by the direct method in electric fields ranging from 0 up to 100 kV/cm and at temperatures of up to 150 °C. The choice of 0.8Na1/2Bi1/2TiO3-0.2BaTiO3 as the starting composition is motivated by high spontaneous polarization within the studied range of electric fields, while CaTiO3 is added to reduce depolarization temperature at, and below, room temperature. In the studied temperature range, the maximal value of electrocaloric effect with temperature change of ΔT = 1.0 °C was found in the composition with x = 0.050 at 100 °C, having significant contribution from the entropy jump at the first-order phase transition induced by an electric field. At increasing CaTiO3 concentration, the attainable ΔT decreases. Measurements of polarization current, which were taken simultaneously with ΔT measurements, allowed us to study differences between ΔT obtained by the direct and the indirect methods.

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Section: Introductionmentioning

confidence: 99%

Electrocaloric Effect in (1−x)(0.8Na0.5Bi0.5TiO3-0.2BaTiO3)−xCaTiO3 Solid Solutions at High Electric Fields

et al. 2022

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“…It was chosen due to its benefit to apply in wide area. For the example, the work related to GNPs on modifying electrocaloric effect for the cooling system is currently reported by our prior work [21]. For the other applications, their unique characteristics make them one of the most promising candidates for nanocomposite storage, batteries and supercapacitors [1].…”

Section: Introductionmentioning

confidence: 99%

Electron-Beam Irradiation for Boosting Storage Energy Density of Tuned Poly(vinylidene fluoride-hexafluoropropylene)/Graphene Nanoplatelet Polymer Composites

2020

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In current, the energy storage materials based on electrets and ferroelectric polymers are urgently demanded for electric power supply and renewable energy applications. The high energy storage density can be enhanced by conducting or inorganic fillers to ferroelectric polymer matrix. However, agglomeration, phase separation of fillers, interfacial phase regions and crystallinity of matrix remain the main factors for the improvement of energy storage density in those composites. Poly(vinylidene fluoride-hexafluoropropylene) was modified with graphene nanoplatelets for enhanced the dielectric properties and energy storage density, which combines the irradiated by electron beam. Tuning effect of the crystalline regions and polar phases with graphene nanoplatelets and electron irradiation on its surface, structure, electrical and energy storage properties were observed. The film homogeneity was increased by reducing the pores, along with the improvement of surface roughness and hydrophobicity, which related with the dielectric properties and energy storage density. The β-phase fraction and crystallinity improvement significantly affect electrical properties by improving polarization and dielectric constant. As a core, electron beam dramatically reduce the crystals size by two times. Hence, energy storage density of composites was enhanced, while energy loss was reduced under operating conditions. Results on the improvement of energy efficiency were from 68.11 to 74.66% for neat poly(vinylidene fluoride-hexafluoropropylene) (P(VDF-HFP)), much higher than previously reported of 58%, and doubled for P(VDF-HFP)/GNPs composites which will be discussed and evaluated for the practical energy storage materials.

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Effect of rare earth Er and Dy on the Curie temperature and interfacial charge mobility of electrocaloric PVDF-HFP composites

Salea

Jehlaeh

Zhang

et al. 2020

J Mater Sci: Mater Electron

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The microstructure of negative electrocaloric Polyvinylidene fluoride-hexafluoropropylene copolymer on graphene loading for eco-friendly cooling technology

Cited by 13 publications

References 46 publications

Electrocaloric Effect in (1−x)(0.8Na0.5Bi0.5TiO3-0.2BaTiO3)−xCaTiO3 Solid Solutions at High Electric Fields

Electrocaloric Effect in (1−x)(0.8Na0.5Bi0.5TiO3-0.2BaTiO3)−xCaTiO3 Solid Solutions at High Electric Fields

Electron-Beam Irradiation for Boosting Storage Energy Density of Tuned Poly(vinylidene fluoride-hexafluoropropylene)/Graphene Nanoplatelet Polymer Composites

Effect of rare earth Er and Dy on the Curie temperature and interfacial charge mobility of electrocaloric PVDF-HFP composites

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