Sim, Yelyn, Surendran, Subramani ORCID: 0000-0003-0750-3199, Cha, Hamchorom, Choi, Hyeonuk, Je, Minyeong, Yoo, Seungryul, Seok, Dong Chan, Jung, Yong Ho, Jeon, Cheolho, Kim, Dong Jin, Han, Mi-Kyung, Choi, Heechae ORCID: 0000-0002-9390-6607, Sim, Uk and Moon, Joonhee (2022). Fluorine-doped graphene oxide prepared by direct plasma treatment for supercapacitor application. Chem. Eng. J., 428. LAUSANNE: ELSEVIER SCIENCE SA. ISSN 1873-3212

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Abstract

Charge storage in supercapacitors is strongly related to the bond characteristics and electronic structure of electrode materials. Graphene-based materials are widely used in a supercapacitor due to the easily tunable properties and high surface/volume ratios. However, we claim that the typical covalent bond characteristics of 2D carbon materials originating from this 2p pi orbital is not very suitable to the application in supercapacitor. Here, we suggest an efficient way to improve the supercapacitor performance by tuning the covalency of bonding between the graphene-based electrode and potassium ion. We, for the first time, also introduce a simple solventfree scale-up doping technique to prepare fluorine-doped graphene oxide (FGO) by direct plasma treatment on graphene oxide (GO) powder at ambient pressure. The FGO enabled fast electrochemical charge transfer and provided a large number of active sites for redox reactions during supercapacitor operation, and those mechanisms were thoroughly studied by various electrochemical analyses. As a result, the fabricated symmetric supercapacitor using FGO electrodes exhibited a maximum power density (-3200 W/kg) and energy density (-25.87 Wh/kg) with superior cycle stability (20000 cycles) without capacitance loss. Furthermore, the computational calculation results clarified the roles of semi-ionic C-F bonding of FGO: huge charge accumulation on the electrodes and superior electrical conductivity. Thus, our study demonstrates a facile strategy to develop promising functionalized materials, which can enhance the viability of supercapacitor for the next generation of energy storage systems.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Sim, YelynUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Surendran, SubramaniUNSPECIFIEDorcid.org/0000-0003-0750-3199UNSPECIFIED
Cha, HamchoromUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Choi, HyeonukUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Je, MinyeongUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yoo, SeungryulUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Seok, Dong ChanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jung, Yong HoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jeon, CheolhoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kim, Dong JinUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Han, Mi-KyungUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Choi, HeechaeUNSPECIFIEDorcid.org/0000-0002-9390-6607UNSPECIFIED
Sim, UkUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Moon, JoonheeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-589489
DOI: 10.1016/j.cej.2021.132086
Journal or Publication Title: Chem. Eng. J.
Volume: 428
Date: 2022
Publisher: ELSEVIER SCIENCE SA
Place of Publication: LAUSANNE
ISSN: 1873-3212
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
GENERALIZED GRADIENT APPROXIMATION; TOTAL-ENERGY CALCULATIONS; POROUS CARBON NANOFIBERS; DOUBLE-LAYER; ACTIVATED CARBON; ELECTRODE MATERIALS; AQUEOUS SUPERCAPACITORS; MESOPOROUS CARBON; FACILE SYNTHESIS; HIGH-CAPACITYMultiple languages
Engineering, Environmental; Engineering, ChemicalMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/58948

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