Enhanced capacitive behaviour of graphene based electrochemical double layer capacitors by etheric substitution on ionic liquids

Siyahjani, Shirin; Öner, Saliha; Diker, Halide; Gültekin, Burak; Varlıklı, Canan

doi:10.1016/j.jpowsour.2020.228353

Cited by 28 publications

(15 citation statements)

References 39 publications

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“…[ 7–13 ] However, it is not easy to develop a microporous carbon structure simultaneously satisfying a large surface area and high electrical conductivity. [ 7–23 ]…”

Section: Introductionmentioning

confidence: 99%

Polyethylene‐Derived Activated Carbon Materials for Commercially Available Supercapacitor in an Organic Electrolyte System

Yang

Mok

Jung

et al. 2022

Macromol. Rapid Commun.

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High‐performance supercapacitors based on activated carbons (AC) derived from polyethylene (PE), which is one of the most abundant plastic materials worldwide, are fabricated. First, PE carbons (PEC) are prepared via sulfonation, which is a reported solution for successful carbonization of innately non‐carbonizable PE. Then, the physico‐electrical changes of PECs upon a chemical activation process are explored. Interestingly, upon the chemical activation, PECs are converted ACs with a large surface area and high crystallinity at the same time. Subsequently, PE‐derived ACs (PEAC) are exploited as electrode materials for supercapacitors. Resultant supercapacitors based on PEACs exhibit impressive performance. When compared to supercapacitors based on YP50f, representative commercial ACs, devices using PEACs presented considerably good capacitance, low resistance, and great rate capability. Specifically, the retention rate of devices using PEACs is significantly higher than that of YP50f‐based devices. At the high rate of charge−discharge situation reaching 7 A g−1, the capacitance of supercapacitors using PEACs is ≈70% higher than that of YP50f‐based devices. It is assumed that the carbon structure accompanying both large surface area and high conductivity endows a great electrochemical performance at the high current operating conditions. Therefore, it is envisioned that PE may be a viable candidate electrode material for commercially available supercapacitors.

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“…[ 7–13 ] However, it is not easy to develop a microporous carbon structure simultaneously satisfying a large surface area and high electrical conductivity. [ 7–23 ]…”

Section: Introductionmentioning

confidence: 99%

Polyethylene‐Derived Activated Carbon Materials for Commercially Available Supercapacitor in an Organic Electrolyte System

Yang

Mok

Jung

et al. 2022

Macromol. Rapid Commun.

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“…Recently, ionic liquid (IL) modified PVDF and its nanocomposites, such as PVDF/graphene 21,22 and PVDF/MWCNT 23,24 blends have been reported by some researchers. IL is a molten salt composed of organic cation and inorganic anion at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Cooperative modification of PVDF electroactive films due to the exfoliated and oriented Na⁺‐MMT with assistance of different cationic chain length ionic liquids

Liu

Zhao

et al. 2022

J of Applied Polymer Sci

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Poly(vinylidene fluoride) (PVDF) based nano dielectric composites have been investigated widely due to their potential application in sensors, actuators, and energy storage fields. To achieve these goals, a novel modification of PVDF electroactive films was prepared due to the exfoliated and oriented Na + -MMT with the assistance of different cationic chain length imidazole-based ionic liquids.The results proved the ion exchange between Na + -MMT and ILs promoted exfoliation and uniform dispersion of Na + -MMT in PVDF matrix efficiently even under a low ILs content (<0.05%). Furthermore, the existence of ILs and shearing force contributed to the oriented dispersion of Na + -MMT. The synergistic effect of Na + -MMT and ILs induced the crystal conformation transition from non-polar α-crystal to electroactive β/γ crystal. The ILs with longer cationic chains behaved much higher inducibility for PVDF electroactive phases. Compared with pure PVDF, PVDF/Na + -MMT/ILs nanocomposites with longer cationic chain ILs showed higher dielectric constant, breakdown strength, and energy density, while kept low-dielectric loss and conductivity. The improved compatibility between PVDF and Na + -MMT due to the ion exchange and decreased crystal size for the polar β/γ crystal enhanced the transparency and elongation at break of PVDF/ Na + -MMT/ILs nanocomposites significantly. The results proved [C16MIM] [Cl] behaved optimum synergistic modification effect for the nanocomposites, and which showed potential applications in dielectric energy storage and microelectronic fields.

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“…3D structures of ILs are strongly effective on formation pi‐pi stacking tendency which increases at smaller cations with less steric effect. Mobilities of aggregates are lower compared to non‐aggregated species exhibiting lower ionic conductivities as a result of higher viscosity [51] …”

Section: Resultsmentioning

confidence: 98%

“…Mobilities of aggregates are lower compared to non-aggregated species exhibiting lower ionic conductivities as a result of higher viscosity. [51] In case of AMEII, D e was calculated as 0.57 × 10 À 7 cm 2 s À 1 , which is slightly larger than AMII with D e = 0.49 × 10 À 7 cm 2 s À 1 although the former cation was much larger than the latter. Correlation between diffusion coefficient and short circuit photo current (J sc ) of DSSC is linear.…”

Section: Electrochemical Propertiesmentioning

confidence: 83%

Influence of Cation Size and Polarity on Charge Transport in Ionic Liquid Based Electrolytes

Aydın

Öner

Zafer

et al. 2022

Israel Journal of Chemistry

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Imidazolium-based ionic liquids (ILs) with allyl and ether side chains were synthesized and characterized. Comprehensive structural and photoelectrochemical characterizations were performed, transport properties of ILs were also examined as electrolyte components in dye sensitized solar cells (DSSCs). The properties of synthesized materials and DSSC performances were compared with 1-propyl-3methyl imidazolium iodide (PMII) and 1-allyl-3-ethyl imidazolium iodide (AEII) as reference ILs. Ionic conductivities, diffusion coefficients and charge transfer resistances of synthesized ionic liquids were investigated on DSSCs by Electrochemical Impedance Spectroscopy (EIS). The diffusion coefficient values of triiodide ions in different ionic liquid-based electrolytes were measured by the means of diffusion limited current density method and found to be 1.75 × 10 À 7 cm 2 s À 1 and 2.05 × 10 À 7 cm 2 s À 1 with corresponding photocurrent densities of 10.38 mAcm À 2 and 12.13 mAcm À 2 for the reference AEII and PMII based electrolytes, respectively. However, for the electrolytes of 1-(2-methoxyethyl)-3allyl imidazolium iodide and 1-allyl-3-methyl imidazolium iodide ionic liquids, these values were found to be 0.86 × 10 À 7 cm 2 s À 1 and 0.57 × 10 À 7 cm 2 s À 1 with photocurrent densities of 9.53 mAcm À 2 and 8.98 mAcm À 2 , respectively. Allyl and ether substituted imidazolium ILs exhibited promising results as potential alternative electrolyte materials for DSSCs.

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Enhanced capacitive behaviour of graphene based electrochemical double layer capacitors by etheric substitution on ionic liquids

Cited by 28 publications

References 39 publications

Polyethylene‐Derived Activated Carbon Materials for Commercially Available Supercapacitor in an Organic Electrolyte System

Polyethylene‐Derived Activated Carbon Materials for Commercially Available Supercapacitor in an Organic Electrolyte System

Cooperative modification of PVDF electroactive films due to the exfoliated and oriented Na⁺‐MMT with assistance of different cationic chain length ionic liquids

Influence of Cation Size and Polarity on Charge Transport in Ionic Liquid Based Electrolytes

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Enhanced capacitive behaviour of graphene based electrochemical double layer capacitors by etheric substitution on ionic liquids

Cited by 28 publications

References 39 publications

Polyethylene‐Derived Activated Carbon Materials for Commercially Available Supercapacitor in an Organic Electrolyte System

Polyethylene‐Derived Activated Carbon Materials for Commercially Available Supercapacitor in an Organic Electrolyte System

Cooperative modification of PVDF electroactive films due to the exfoliated and oriented Na+‐MMT with assistance of different cationic chain length ionic liquids

Influence of Cation Size and Polarity on Charge Transport in Ionic Liquid Based Electrolytes

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Cooperative modification of PVDF electroactive films due to the exfoliated and oriented Na⁺‐MMT with assistance of different cationic chain length ionic liquids