Flexible polymer-based nanodielectrics reinforced with electrospun composite nanofibers for capacitive energy storage
Flexible polymer-based nanodielectrics reinforced with electrospun composite nanofibers for capacitive energy storage
Nanocomposite materials based on polydimethylsiloxane (PDMS) reinforced by electrospun poly(vinylidene fluoride) (PVDF) nanofibers and barium titanate (BTO) nanoparticles were fabricated and tested as dielectric materials for capacitive energy storage applications. Two types of BTO nanoparticles were examined, prior and after ball milling, to investigate the effect of interfacial area and size on the dielectric properties. The morphology of the produced PVDF nanofibers was evaluated via scanning electron microscopy (SEM) to ensure the optimum electrospinning conditions and verify the incorporation of BTO nanoparticles. The composite systems were analyzed by dielectric spectroscopy, and three dielectric processes were revealed: the dynamic glass-to-rubber transition processes of PDMS and PVDF and an interfacial polarization process. It was observed that the dynamic glass-to-rubber transition process of the PVDF nanofibers strongly depends on the size of the BTO nanoparticles that introduce confinement effects and affect thus the temperature dependence of the relaxation. In addition, as verified by ac conductivity, ball milling reduced the conduction of the nanocomposites by 80%, indicating the increase of the charge carrier trapping area around the BTO nanoparticles. Finally, the developed nanocomposites were tested as dielectric materials for capacitor applications at room temperature conducting charge/discharge measurements under the influence of a dc electric field, and their discharge performance and efficiency were examined at various dc voltages (50–300 V) and cycle life. Here, experimental evidence regarding the importance of interfacial area on the energy storage performance in nanodielectrics is presented that will aid the development of more efficient energy materials.
PDMS, electrospinning, energy storage, nanocomposites, nanodielectrics
8203-8215
Drakopoulos, Stavros X.
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Yang, Jing
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Vryonis, Orestis
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Williams, Leah
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Psarras, Georgios C.
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Mele, Elisa
cb22ed24-3d8c-4ad0-bf47-0d998761d0de
11 November 2022
Drakopoulos, Stavros X.
7bbdf434-78b0-4224-9cc0-ed57ad0f5f37
Yang, Jing
0e9fd4eb-c2dd-4e3a-88c5-84318dcb95ea
Vryonis, Orestis
4affde05-88f2-436f-b036-dceedf31ea9c
Williams, Leah
f42397bc-e213-4171-b0c6-d130cb6aa5d6
Psarras, Georgios C.
488c3089-e396-4e10-8f12-62c9d0bda2b0
Mele, Elisa
cb22ed24-3d8c-4ad0-bf47-0d998761d0de
Drakopoulos, Stavros X., Yang, Jing, Vryonis, Orestis, Williams, Leah, Psarras, Georgios C. and Mele, Elisa
(2022)
Flexible polymer-based nanodielectrics reinforced with electrospun composite nanofibers for capacitive energy storage.
ACS Applied Polymer Materials, 4 (11), .
(doi:10.1021/acsapm.2c01162).
Abstract
Nanocomposite materials based on polydimethylsiloxane (PDMS) reinforced by electrospun poly(vinylidene fluoride) (PVDF) nanofibers and barium titanate (BTO) nanoparticles were fabricated and tested as dielectric materials for capacitive energy storage applications. Two types of BTO nanoparticles were examined, prior and after ball milling, to investigate the effect of interfacial area and size on the dielectric properties. The morphology of the produced PVDF nanofibers was evaluated via scanning electron microscopy (SEM) to ensure the optimum electrospinning conditions and verify the incorporation of BTO nanoparticles. The composite systems were analyzed by dielectric spectroscopy, and three dielectric processes were revealed: the dynamic glass-to-rubber transition processes of PDMS and PVDF and an interfacial polarization process. It was observed that the dynamic glass-to-rubber transition process of the PVDF nanofibers strongly depends on the size of the BTO nanoparticles that introduce confinement effects and affect thus the temperature dependence of the relaxation. In addition, as verified by ac conductivity, ball milling reduced the conduction of the nanocomposites by 80%, indicating the increase of the charge carrier trapping area around the BTO nanoparticles. Finally, the developed nanocomposites were tested as dielectric materials for capacitor applications at room temperature conducting charge/discharge measurements under the influence of a dc electric field, and their discharge performance and efficiency were examined at various dc voltages (50–300 V) and cycle life. Here, experimental evidence regarding the importance of interfacial area on the energy storage performance in nanodielectrics is presented that will aid the development of more efficient energy materials.
Text
acsapm.2c01162
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Accepted/In Press date: 9 October 2022
e-pub ahead of print date: 18 October 2022
Published date: 11 November 2022
Keywords:
PDMS, electrospinning, energy storage, nanocomposites, nanodielectrics
Identifiers
Local EPrints ID: 474489
URI: http://eprints.soton.ac.uk/id/eprint/474489
ISSN: 2637-6105
PURE UUID: 6ef506f3-cfd2-458a-a500-4e3ee5ff69a2
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Date deposited: 22 Feb 2023 23:46
Last modified: 17 Mar 2024 03:40
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Contributors
Author:
Stavros X. Drakopoulos
Author:
Jing Yang
Author:
Orestis Vryonis
Author:
Leah Williams
Author:
Georgios C. Psarras
Author:
Elisa Mele
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