Enhancement of Volumetric Capacitance of Binder-Free Single-Walled Carbon Nanotube Film via Fluorination

Enhancement of Volumetric Capacitance of Binder-Free Single-Walled Carbon Nanotube Film via Fluorination Full article

Journal

Nanomaterials
ISSN: 2079-4991

Output data

Year: 2021, Article number : 1135, Pages count : 15 DOI: 10.3390/nano11051135

Tags

single-walled carbon nanotubes; 1,2-dichlorobenzene; fluorination; binder-free film; 1M H2SO4 electrolyte; electrochemical capacitors

Authors

Gurova O.A. ¹ , Sysoev V.I. ¹ , Lobiak E.V. ¹ , Makarova A.A. ² , Asanov I.P. ¹ , Okotrub A.V. ¹ , Kulik L.V. ³ , Bulusheva L.G. ¹

Affiliations

1	Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, Russia
2	Physical Chemistry, Institute of Chemistry and Biochemistry, Free University of Berlin
3	V.V. Voevodsky Institute of Chemical Kinetics and Combustion, Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, Russia

Robust electrode materials without the addition of binders allow increasing efficiency of electrical storage devices. We demonstrate the fabrication of binder-free electrodes from modified single-walled carbon nanotubes (SWCNTs) for electrochemical double-layer capacitors (EDLCs). Modification of SWCNTs included a sonication in 1,2-dichlorobenzene and/or fluorination with gaseous BrF3 at room temperature. The sonication caused the shortening of SWCNTs and the splitting of their bundles. As a result, the film prepared from such SWCNTs had a higher density and attached a larger amount of fluorine as compared to the film from non-sonicated SWCNTs. In EDLCs with 1M H2SO4 electrolyte, the fluorinated films were gradually defluorinated, which lead to an increase of the specific capacitance by 2.5–4 times in comparison with the initial values. Although the highest gravimetric capacitance (29 F g−1 at 100 mV s−1) was observed for the binder-free film from non-modified SWCNT, the fluorinated film from the sonicated SWCNTs had an enhanced volumetric capacitance (44 F cm−3 at 100 mV s−1). Initial SWCNT films and defluorinated films showed stable work in EDLCs during several thousand cycles.

Gurova O.A. , Sysoev V.I. , Lobiak E.V. , Makarova A.A. , Asanov I.P. , Okotrub A.V. , Kulik L.V. , Bulusheva L.G.
Enhancement of Volumetric Capacitance of Binder-Free Single-Walled Carbon Nanotube Film via Fluorination
Nanomaterials. 2021. 1135 :1-15. DOI: 10.3390/nano11051135 WOS Scopus РИНЦ OpenAlex

Web of science:	WOS:000657050500001
Scopus:	2-s2.0-85104722678
Elibrary:	46049252
OpenAlex:	W3157580118

DB	Citing
OpenAlex	7
Web of science	7
Scopus	8
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