Room temperature synthesis of fluorinated graphite intercalation compounds with low fluorine loading of host matrix

Chekhova, G. N.; Pinakov, D. V.; Shubin, Yu. V.; Fadeeva, V. P.; Тихова, В. Д.; Окотруб, А. В.; Bulusheva, L. G.

doi:10.1016/j.jfluchem.2020.109482

Cited by 8 publications

(8 citation statements)

References 44 publications

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“…Generally, graphite consists of many sp 2 hybridized carbon layers with a certain interlayer distance (0.336 nm). Appropriate guest species like ions, atoms, and molecules can diffuse into the interlayer and form the intercalation compounds, whose physico‐chemical properties can be tuned by the guest species and concentrations 20‐22 …”

Section: Graphitic Carbon For Potassium‐ion Batteriesmentioning

confidence: 99%

Carbon‐based anode materials for potassium‐ion batteries: From material, mechanism to performance

Zhou

Guo

2021

SmartMat

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Potassium‐ion batteries (PIBs) show great potential in the application of large‐scale energy storage devices due to the comparable high operating voltage with lithium‐ion batteries and lower cost. Carbon‐based materials are promising candidates as anodes for PIBs, for their low cost, high abundance, nontoxicity, environmental benignity, and sustainability. In this review, we will first discuss the potassium storage mechanisms of graphitic and defective carbon materials and carbon‐based composites with various compositions and microstructures to comprehensively understand the potassium storage behavior. Then, several strategies based on heteroatoms doping, unique nanostructure design, and introduction of the conductive matrix to form composites are proposed to optimize the carbon‐based materials and achieve high performance for PIBs. Finally, we conclude the existing challenges and perspectives for further development of carbon‐based materials, which is believed to promote the practical application of PIBs in the future.

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Section: Graphitic Carbon For Potassium‐ion Batteriesmentioning

confidence: 99%

Carbon‐based anode materials for potassium‐ion batteries: From material, mechanism to performance

Zhou

Guo

2021

SmartMat

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“…The content of carbon, fluorine, bromine, and nitrogen in the samples was determined from the analysis of products of high-temperature destruction of samples in an oxygen atmosphere [19]. According to the obtained data, the composition of the yellow sample (49 days with 13.89 wt% BrF 3 in Br 2 ) can be represented as CF 0.5 Br 0.005 0.070CH 3 CN and the green-brown sample (87 days with 5.04 wt% BrF 3 in Br 2 ) as CF 0.3 Br 0.005 0.054CH 3 CN.…”

Section: Methodsmentioning

confidence: 99%

“…The interlayer space of fluorinated graphite CF x (x ≤ 0.5) is easily occupied by acetonitrile [18,19]. This molecule contains an element (nitrogen) that is absent in CF x and therefore is a convenient probe for studying host-guest interactions under illumination.…”

Section: Introductionmentioning

confidence: 99%

Photolysis of Fluorinated Graphites with Embedded Acetonitrile Using a White-Beam Synchrotron Radiation

et al. 2022

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Fluorinated graphitic layers with good mechanical and chemical stability, polar C–F bonds, and tunable bandgap are attractive for a variety of applications. In this work, we investigated the photolysis of fluorinated graphites with interlayer embedded acetonitrile, which is the simplest representative of the acetonitrile-containing photosensitizing family. The samples were continuously illuminated in situ with high-brightness non-monochromatized synchrotron radiation. Changes in the compositions of the samples were monitored using X-ray photoelectron spectroscopy and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy. The NEXAFS N K-edge spectra showed that acetonitrile dissociates to form HCN and N2 molecules after exposure to the white beam for 2 s, and the latter molecules completely disappear after exposure for 200 s. The original composition of fluorinated matrices CF0.3 and CF0.5 is changed to CF0.10 and GF0.17, respectively. The highly fluorinated layers lose fluorine atoms together with carbon neighbors, creating atomic vacancies. The edges of vacancies are terminated with the nitrogen atoms and form pyridinic and pyrrolic units. Our in situ studies show that the photolysis products of acetonitrile depend on the photon irradiation duration and composition of the initial CFx matrix. The obtained results evaluate the radiation damage of the acetonitrile-intercalated fluorinated graphites and the opportunities to synthesize nitrogen-doped graphene materials.

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“…The fluorine content in the product was tuned by changing the concentration (C) of BrF 3 diluted by Br 2 and the reaction time (t). The details of the synthesis procedure are described elsewhere [29,30]. Three samples with different fluorine content were used in this study.…”

Section: Methodsmentioning

confidence: 99%

Chemiresistive Properties of Imprinted Fluorinated Graphene Films

et al. 2020

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The electrical conductivity of graphene materials is strongly sensitive to the surface adsorbates, which makes them an excellent platform for the development of gas sensor devices. Functionalization of the surface of graphene opens up the possibility of adjusting the sensor to a target molecule. Here, we investigated the sensor properties of fluorinated graphene films towards exposure to low concentrations of nitrogen dioxide NO2. The films were produced by liquid-phase exfoliation of fluorinated graphite samples with a composition of CF0.08, CF0.23, and CF0.33. Fluorination of graphite using a BrF3/Br2 mixture at room temperature resulted in the covalent attachment of fluorine to basal carbon atoms, which was confirmed by X-ray photoelectron and Raman spectroscopies. Depending on the fluorination degree, the graphite powders had a different dispersion ability in toluene, which affected an average lateral size and thickness of the flakes. The films obtained from fluorinated graphite CF0.33 showed the highest relative response ca. 43% towards 100 ppm NO2 and the best recovery ca. 37% at room temperature.

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Room temperature synthesis of fluorinated graphite intercalation compounds with low fluorine loading of host matrix

Cited by 8 publications

References 44 publications

Carbon‐based anode materials for potassium‐ion batteries: From material, mechanism to performance

Carbon‐based anode materials for potassium‐ion batteries: From material, mechanism to performance

Photolysis of Fluorinated Graphites with Embedded Acetonitrile Using a White-Beam Synchrotron Radiation

Chemiresistive Properties of Imprinted Fluorinated Graphene Films

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