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Simultaneous enhancement of specific capacitance and potential window of graphene-based electric double-layer capacitors using ferroelectric polymers

Despite their high power density, aqueous-based electric double-layer capacitors (EDLCs) possess relatively low energy density due to the limitation of potential window (~1.0 V) and low specific capacitance of active materials. To increase the energy density without sacrificing the power density, it...

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Main Authors:	Viet ThongLe, HanjunRyu, Sang A.Han, HaoVan Bui, Viet HuongNguyen, NguyenVan Hieu, Ju-HyuckLee, Sang-WooKim, Young HeeLee
Format:	Bài trích
Language:	eng
Published:	Journal of Power Sources 2021
Subjects:	Potential window widening Capacitance enhancement Graphene
Online Access:	https://www.sciencedirect.com/science/article/abs/pii/S0378775321007874?via%3Dihub#! https://dlib.phenikaa-uni.edu.vn/handle/PNK/2864 https://doi.org/10.1016/j.jpowsour.2021.230268Get
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spelling	oai:localhost:PNK-28642022-08-17T05:54:49Z Simultaneous enhancement of specific capacitance and potential window of graphene-based electric double-layer capacitors using ferroelectric polymers Viet ThongLe HanjunRyu Sang A.Han HaoVan Bui Viet HuongNguyen NguyenVan Hieu Ju-HyuckLee Sang-WooKim Young HeeLee Potential window widening Capacitance enhancement Graphene Despite their high power density, aqueous-based electric double-layer capacitors (EDLCs) possess relatively low energy density due to the limitation of potential window (~1.0 V) and low specific capacitance of active materials. To increase the energy density without sacrificing the power density, it is highly desired to achieve a simultaneous improvement of both specific capacitance and potential window of EDLCs. However, this remains a major challenge that is not been solved up to date. This work demonstrates that by inserting a polarized-polyvinylidene fluoride (PVDF) ferroelectric layer underneath the graphene, a simultaneous enhancement of both areal capacitance and potential window is achieved, in which the areal capacitance increases from 5.5 to 7.5 μF/cm2 (i.e., 36%) (or 55 F/cm3 to 75 F/cm3 in terms of volumetric capacitance), and the potential window expands from 1.0 V to 1.5 V. This results in a threefold increase in the areal energy density of the capacitor. The enhancement in capacitance can be explained by the Gouy–Chapman–Stern model. The widening of potential window is due to the shift of the Fermi level of graphene caused by the doping effect of the polarized-PVDF layer. 2021-09-14T07:14:55Z 2021-09-14T07:14:55Z 2021 Bài trích https://www.sciencedirect.com/science/article/abs/pii/S0378775321007874?via%3Dihub#! https://dlib.phenikaa-uni.edu.vn/handle/PNK/2864 https://doi.org/10.1016/j.jpowsour.2021.230268Get eng Journal of Power Sources
institution	Digital Phenikaa
collection	Digital Phenikaa
language	eng
topic	Potential window widening Capacitance enhancement Graphene
spellingShingle	Potential window widening Capacitance enhancement Graphene Viet ThongLe HanjunRyu Sang A.Han HaoVan Bui Viet HuongNguyen NguyenVan Hieu Ju-HyuckLee Sang-WooKim Young HeeLee Simultaneous enhancement of specific capacitance and potential window of graphene-based electric double-layer capacitors using ferroelectric polymers
description	Despite their high power density, aqueous-based electric double-layer capacitors (EDLCs) possess relatively low energy density due to the limitation of potential window (~1.0 V) and low specific capacitance of active materials. To increase the energy density without sacrificing the power density, it is highly desired to achieve a simultaneous improvement of both specific capacitance and potential window of EDLCs. However, this remains a major challenge that is not been solved up to date. This work demonstrates that by inserting a polarized-polyvinylidene fluoride (PVDF) ferroelectric layer underneath the graphene, a simultaneous enhancement of both areal capacitance and potential window is achieved, in which the areal capacitance increases from 5.5 to 7.5 μF/cm2 (i.e., 36%) (or 55 F/cm3 to 75 F/cm3 in terms of volumetric capacitance), and the potential window expands from 1.0 V to 1.5 V. This results in a threefold increase in the areal energy density of the capacitor. The enhancement in capacitance can be explained by the Gouy–Chapman–Stern model. The widening of potential window is due to the shift of the Fermi level of graphene caused by the doping effect of the polarized-PVDF layer.
format	Bài trích
author	Viet ThongLe HanjunRyu Sang A.Han HaoVan Bui Viet HuongNguyen NguyenVan Hieu Ju-HyuckLee Sang-WooKim Young HeeLee
author_facet	Viet ThongLe HanjunRyu Sang A.Han HaoVan Bui Viet HuongNguyen NguyenVan Hieu Ju-HyuckLee Sang-WooKim Young HeeLee
author_sort	Viet ThongLe
title	Simultaneous enhancement of specific capacitance and potential window of graphene-based electric double-layer capacitors using ferroelectric polymers
title_short	Simultaneous enhancement of specific capacitance and potential window of graphene-based electric double-layer capacitors using ferroelectric polymers
title_full	Simultaneous enhancement of specific capacitance and potential window of graphene-based electric double-layer capacitors using ferroelectric polymers
title_fullStr	Simultaneous enhancement of specific capacitance and potential window of graphene-based electric double-layer capacitors using ferroelectric polymers
title_full_unstemmed	Simultaneous enhancement of specific capacitance and potential window of graphene-based electric double-layer capacitors using ferroelectric polymers
title_sort	simultaneous enhancement of specific capacitance and potential window of graphene-based electric double-layer capacitors using ferroelectric polymers
publisher	Journal of Power Sources
publishDate	2021
url	https://www.sciencedirect.com/science/article/abs/pii/S0378775321007874?via%3Dihub#! https://dlib.phenikaa-uni.edu.vn/handle/PNK/2864 https://doi.org/10.1016/j.jpowsour.2021.230268Get
_version_	1751856304160243712
score	8.887836

Simultaneous enhancement of specific capacitance and potential window of graphene-based electric double-layer capacitors using ferroelectric polymers

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