Preferred attachment of fluorine near oxygen-containing groups on the surface of double-walled carbon nanotubes

Fedoseeva, Yu. V.; Bulusheva, L. G.; Koroteev, Victor O.; Mevellec, Jean‐Yves; Senkovskiy, Boris V.; Flahaut, Emmanuel; Окотруб, А. В.

doi:10.1016/j.apsusc.2019.144357

Cited by 23 publications

(13 citation statements)

References 66 publications

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“…S4. The features located between the π* and σ* resonance peaks refer to C atoms bound to O and F; two peaks related to π* C-O (287.5 eV) and π* C-F (287.7 eV) may also be observed [24]. The spectra of the plasma-treated samples between 286 and 289 eV differ from those of the pristine sample.…”

Section: Articles Science China Materialsmentioning

confidence: 93%

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Carbon electrodes with ionophobic characteristics in organic electrolyte for high-performance electric double-layer capacitors

et al. 2021

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Activated carbon (AC) in organic electrolytebased electric double-layer capacitors (EDLCs) usually suffers from low specific capacitance. Most studies on AC focus on improving its surface area and optimizing pore structures to enhance its electrochemical performance in EDLCs. Unfortunately, the interfacial microenvironment, which is composed of nanoporous carbon and the organic electrolyte confined in it, is always ignored. Herein, a simple and powerful strategy to create AC with an ionophobic surface is proposed to address the poor efficiency of the electric doublelayer process. The polar C-F bonds formed in the AC material are characterized through near-edge X-ray absorption fine structure and X-ray photoelectron spectroscopy. The ionophobic characteristic of YP-F60s in an organic electrolyte is extensively studied via contact angle measurements and smallangle X-ray scattering spectroscopy. An EDLC constructed with YP-F60s as the electrode and 1 mol L −1 tetraethylammonium tetrafluoroborate/propylene carbonate as the electrolyte demonstrates high specific capacitance, low internal resistance, and excellent cycling stability. Our results successfully demonstrate the importance of the interfacial microenvironment of AC and its confined electrolyte to the electrochemical performance of EDLCs. Our work also offers new perspectives on the use of the CF 4 plasma technique to fabricate low-cost superior carbon for EDLCs.

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Section: Articles Science China Materialsmentioning

confidence: 93%

“…The F K-edge NEXAFS spectra of the samples are shown in Fig. 2e, which illustrates broad peaks at 686.8 eV (A peak), 689.6 eV (B peak), and 692 eV (C peak) [24][25][26]. These resonances correspond to excitations from the F 1s state to the σ* state due to the covalent interaction between F and C atoms.…”

Section: Articles Science China Materialsmentioning

confidence: 99%

Carbon electrodes with ionophobic characteristics in organic electrolyte for high-performance electric double-layer capacitors

et al. 2021

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“…Another method reported by Fedoseeva et al consists of fluorination of DWCNT containing oxygen at outer surface using BrF 3 at room temperature. Fluorine attachment is shown near the oxygen groups on the nanotube as shown in Figure 14 with double concentration of sidewall fluorine in the oxygenated DWCNTs, which confirms that physical and chemical properties of CNT scan be changed through fluorine and oxygen groups [168].…”

Section: Fluorination Fluorination Is One Of the Methods Authorizing An Efficient Functionalization Of Carbon Nanotubesmentioning

confidence: 52%

Carbon Nanotubes (CNTs) from Synthesis to Functionalized (CNTs) Using Conventional and New Chemical Approaches

Salah

Ouslimani

Bousba

et al. 2021

Journal of Nanomaterials

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Carbon nanotubes (CNTs) have emerged worldwide because of their remarkable properties enlarging their field of applications. Functionalization of CNTs is a convenient strategy to tackle low dispersion and solubilization of CNTs in many solvents or polymers. It can be done by covalent or noncovalent surface functionalization that is briefly discussed regarding the current literature. Endohedral and exohedral are conventional methods based on covalent and van der Waals bonding forces that are created through CNT functionalization by various materials. In this paper, a review of new approaches and mechanisms of functionalization of CNTs is proposed, including amidation, fluorination, bromination, chlorination, hydrogenation, and electrophilic addition. Our analysis is supported by several characterization methods highlighting recent improvements hence extending the range of applicability of CNTs.

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“…This upshift is due to the transfer of electron density from carbon to the fluorine atom. The C 1s spectra of F-SW and F-SW_DC films also show two intense components at 285.7 and 288.4 eV attributed to the carbon neighboring with CF-group (C*-CF) and the carbon covalently bonded with fluorine (C-F), respectively [ 33 , 34 ]. The components at 290.5 and 292.5 eV correspond to the edge CF 2 and CF 3 groups, respectively [ 35 ].…”

Section: Resultsmentioning

confidence: 99%

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

et al. 2021

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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.

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Preferred attachment of fluorine near oxygen-containing groups on the surface of double-walled carbon nanotubes

Cited by 23 publications

References 66 publications

Carbon electrodes with ionophobic characteristics in organic electrolyte for high-performance electric double-layer capacitors

Carbon electrodes with ionophobic characteristics in organic electrolyte for high-performance electric double-layer capacitors

Carbon Nanotubes (CNTs) from Synthesis to Functionalized (CNTs) Using Conventional and New Chemical Approaches

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

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