Hydrothermal preparation of fluorinated graphene hydrogel for high-performance supercapacitors

An, Haoran; Liu, Yu; Peng, Long; Gao, Yi; Qin, Chengqun; Chen, Cao; Feng, Yiyu; Feng, Wei

doi:10.1016/j.jpowsour.2016.02.057

Cited by 154 publications

(81 citation statements)

References 88 publications

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“…The spectrum from the FMX24 sample shows only two peaks that are related to Ti−O−F bonds and covalently bonded F with a high surface coverage. With higher fluorination times it is confirmed that the samples start to be dominated by two types of F, the Ti−O−F bond and densely packed covalently bonded F (F HD −C) …”

Section: Resultsmentioning

confidence: 67%

Fluorination of MXene by Elemental F₂ as Electrode Material for Lithium‐Ion Batteries

et al. 2019

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What prompted you to investigate this topic/problem? Lithium-ion batteries (LIBs), due to the inherentl imitations of traditional electrode materials, have relatively low energy and power density which hinders their application for electric vehicles. In order to tackle this problem, different engineering routes are being developed to increase their performance. Therefore, we have developed ad irect-fluorination process for the formation of oxyfluorides with the aim of also improving the cost effectiveness and practicality.D irect fluorination by elemental fluorine is one of the best solutions to obtain highly pure oxyfluoride materials, whicho ur group is using for research on electrode materials. With this approach, we have demonstrated for the first time the formation of 2D-titanium oxyfluoride (TiOF 2 )v ia low temperature directfluorination.

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Section: Resultsmentioning

confidence: 67%

Fluorination of MXene by Elemental F₂ as Electrode Material for Lithium‐Ion Batteries

et al. 2019

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“…The integrated area under the peaks result in fluorine content of 10.2 at% where 8.02 at% and 2.17 at% correspond to the fluorine atoms having semi‐ionic and ionic C—F bond, respectively. The emergence of the C—F bond in high–resolution C1s and F1s spectra verify that fluorine atoms are functionalized in the VC matrix successfully …”

Section: Resultsmentioning

confidence: 76%

“…Raman spectra of VC and F‐VC are shown in Figure . The fluorination of carbon is expected to create disorder and defects in sp 2 ‐hybridized carbon and thus increase the defect density in the graphitic carbon . The signature D band and G band of graphitic carbon are observed in the spectra of both samples.…”

Section: Resultsmentioning

confidence: 99%

“…An unusual peak shift towards higher wavenumber is observed in F–VC with respect to peaks in VC spectrum. This can be associated with the functionalization of the graphitic skeleton by fluorine and F‐TEDA moiety . The intensity ratio ( I D / I G ) of corresponding D and G bands is calculated to quantitatively analyze the defects in VC and F‐VC.…”

Section: Resultsmentioning

confidence: 99%

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Electrophilic Fluorination of Graphitic Carbon for Enhancement in Electric Double‐Layer Capacitance

et al. 2019

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Graphitic carbon is the ultimate source of carbon electrodes for practical application in energy storage devices as it is commercially available at a much lower cost in contrast to other forms of nanostructured carbon. Recently, fluorinated carbon with improved electrical conductivity and wettability has been found to possess better and efficient electrochemical storage properties. However, the development of a simple fluorination process is still a challenge. Herein, Selectfluor (F‐TEDA) is explored as a fluorinating agent for Vulcan carbon. Fluorination of carbon material results in the formation of semi‐ionic C—F (F = 8.02 at%) and ionic C—F (F = 2.71 at%) bonds as observed in X‐ray photoelectron spectroscopy analysis along with an increase in defect density (ID/IG) by 33.4%. Symmetric two‐electrode supercapacitor cells are assembled in Swagelok‐type geometry, and the specific capacitance of fluorinated carbon is found to increase by ≈15 times in contrast to pristine carbon due to induced surface polarization despite the decrease in specific surface area by ≈34%, which is remarkable. The fabricated device is stable with ≈96% capacitance retention over 10 000 cycles, resulting in enhanced supercapacitive performance.

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“…Figure 5a shows the CV curves recorded in the potential window from 0t o1 .0 Vatd ifferent scan rates from 0.1 to 4.0 Ag À1 .T he shape of the CV curvess lightly deviates from the ideal rectangular shape and is ascribed to pseudo-capacitancea ssociated with the N-doping. [57][58][59][60][61] Furthermore, the two-electrode symmetrical supercapacitorr etained 84.40 %c apacitance after 5000 cycles of operation at ac urrent density of 2Ag À1 (Figure 5e). [58] The specific capacitance was as high as 132 Fg À1 at the current density of 0.1 Ag À1 ,a nd preserved at 104 Fg À1 when the current density increased to 4Ag À1 (Figure5c).…”

Section: Resultsmentioning

confidence: 97%

Synthesis of Mesoporous ZIF‐8 Nanoribbons and their Conversion into Carbon Nanoribbons for High‐Performance Supercapacitors

Yang

Chen

Bian

et al. 2018

Chemistry A European J

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ZIF-8 nanoribbons, with tunable morphology and pore structure, were synthesized by using the tri-block co-polymer Pluronic F127 as a soft template. The as-synthesized ZIF-8 nanoribbons were converted into carbon nanoribbons by thermal transformation with largely preserved morphology and porosity. The resulting carbon nanoribbons feature both micro- and meso-pores with high surface areas of over 1000 m g . In addition, nitrogen-doping in the carbon nanoribbons was achieved, as confirmed by XPS and EELS measurements. The hybrid carbon nanoribbons provide pseudo-capacitance that promotes electrochemical performance, rendering a high specific capacitance of up to 297 F g at a current density of 0.5 A g in a three-electrode system. A long cycle life was also demonstrated by recording a 90.26 % preservation of capacitance after 10 000 cycles of charge-discharge at a current density of 4.0 A g . Furthermore, a symmetrical supercapacitor is fabricated by employing the carbon nanoribbons, which shows good electrochemical performance with respect to energy, power and cycle life.

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Hydrothermal preparation of fluorinated graphene hydrogel for high-performance supercapacitors

Cited by 154 publications

References 88 publications

Fluorination of MXene by Elemental F₂ as Electrode Material for Lithium‐Ion Batteries

Fluorination of MXene by Elemental F₂ as Electrode Material for Lithium‐Ion Batteries

Electrophilic Fluorination of Graphitic Carbon for Enhancement in Electric Double‐Layer Capacitance

Synthesis of Mesoporous ZIF‐8 Nanoribbons and their Conversion into Carbon Nanoribbons for High‐Performance Supercapacitors

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Hydrothermal preparation of fluorinated graphene hydrogel for high-performance supercapacitors

Cited by 154 publications

References 88 publications

Fluorination of MXene by Elemental F2 as Electrode Material for Lithium‐Ion Batteries

Fluorination of MXene by Elemental F2 as Electrode Material for Lithium‐Ion Batteries

Electrophilic Fluorination of Graphitic Carbon for Enhancement in Electric Double‐Layer Capacitance

Synthesis of Mesoporous ZIF‐8 Nanoribbons and their Conversion into Carbon Nanoribbons for High‐Performance Supercapacitors

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Fluorination of MXene by Elemental F₂ as Electrode Material for Lithium‐Ion Batteries

Fluorination of MXene by Elemental F₂ as Electrode Material for Lithium‐Ion Batteries