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

Title
Simultaneous enhancement of specific capacitance and potential window of graphene-based electric double-layer capacitors using ferroelectric polymers
Authors
Viet Thong LeRyu, HanjunHan, Sang A.Hao Van BuiViet Huong NguyenNguyen Van HieuLee, Ju-HyuckKim, Sang-WooLee, Young Hee
DGIST Authors
Viet Thong Le; Ryu, Hanjun; Han, Sang A.; Hao Van Bui; Viet Huong Nguyen; Nguyen Van Hieu; Lee, Ju-Hyuck; Kim, Sang-Woo; Lee, Young Hee
Issue Date
2021-09
Citation
Journal of Power Sources, 507, 230268
Type
Article
Author Keywords
Capacitance enhancementEDLCElectrochemical capacitorsGraphenePolarized PVDFPotential window widening
Keywords
ELECTROLYTEPERFORMANCEPORESUPERCAPACITORSCHALLENGES
ISSN
0378-7753
Abstract
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 Elsevier B.V.
URI
http://hdl.handle.net/20.500.11750/15324
DOI
10.1016/j.jpowsour.2021.230268
Publisher
Elsevier BV
Related Researcher
  • Author Lee, Ju-Hyuck Energy Conversion Materials Engineering Laboratory
  • Research Interests Energy Harvesting; Synthesis of Various Nano/Microstructured Energy Materials; Piezoelectric Generator; Triboelectric Generator; Bio-Compatible Energy Materials and Generator; Biomimetic Biomolecule based Energy Materials and Devices
Files:
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Collection:
Department of Energy Science and EngineeringEnergy Conversion Materials Engineering Laboratory1. Journal Articles


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