Electric double-layer capacitance between an ionic liquid and few-layer graphene

Uesugi, Eri; Goto, Hidenori; Eguchi, Ritsuko; Fujiwara, Akihiko; Kubozono, Yoshihiro

doi:10.1038/srep01595

Cited by 147 publications

(162 citation statements)

References 39 publications

(54 reference statements)

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“…In Figure 7a, According to double-layer theory (Eq. 1), when C Q is small (as is known to be the case for graphene 6,12 ) the only way to observe such a significant change in C DL is through an increase in C Q . Using Eq.…”

Section: Fgs Structure/chemistry and Electrochemical Performancementioning

confidence: 96%

“…6,12 However, as a porous supercapacitor electrode, graphene will be exposed to the electrolyte on both sides and must share the available DOS, N 0 between each of the electrode/electrolyte interfaces formed. According to Gerischer C Q ∝ (N 0 ) 0.5 ; and, thus it is expected that C Q , in this situation, would be reduced by a factor of √2.…”

Section: Introductionmentioning

confidence: 99%

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Four-Fold Increase in the Intrinsic Capacitance of Graphene through Functionalization and Lattice Disorder

Pope

Aksay

2015

J. Phys. Chem. C

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Graphene has been heralded as a promising electrode material for high energy and power density electrochemical supercapacitors. This is in spite of recent work confirming the low double-layer capacitance (C DL ) of the graphene/electrolyte interface limited by graphene's low quantum capacitance (C Q ), an effect known for the basal-plane of graphite for over four decades. Consistent with this limit, much of the supercapacitor research implies the use of pristine graphene but, in contrast, uses a functionalized and defective graphene formed through the reduction of graphene oxide, without clarifying why reduced graphene oxide is needed to achieve high capacitance. Herein, we show that an optimal level of functionalization and lattice disorder in reduced graphene oxide yields a four-fold increase in C DL over that of pristine graphene, suggesting graphene-based materials can indeed be tailored to engineer electrodes with significantly higher gravimetric capacitance limits exceeding 450 F/g than what has been achieved (~ 274 F/g) thus far, even in non-aqueous electrolytes capable of high voltage operation. TOC GRAPHICS

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Section: Fgs Structure/chemistry and Electrochemical Performancementioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Four-Fold Increase in the Intrinsic Capacitance of Graphene through Functionalization and Lattice Disorder

Pope

Aksay

2015

J. Phys. Chem. C

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“…Indeed, earlier work [75,203] reported the C dl of a clean graphite surface as $20 mF/cm 2 , typical to any other thin film (Section 2.3.1) providing a benchmark for what may be experimentally observed. Moreover, multiple graphene sheets/few layer graphenes (FLGs), have been shown to have relatively higher capacitance [204,205]. Consideration of intermolecular forces between the atomic-scale sheets [199] operate through two redox systems, through oxidation (/reduction) of the water at the left (/right) electrode to O 2 (/H 2 ).…”

Section: Nanostructured Carbonsmentioning

confidence: 99%

Charge transfer and storage in nanostructures

Bandaru

Yamada

Narayanan

et al. 2015

Materials Science and Engineering: R: Reports

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“…However, reported experiments have failed to show direct evidence of superconducting behaviour in exfoliated graphene, leaving out the archetypal material from studies of 2D superconductivity15.…”

mentioning

confidence: 99%

Enhanced superconductivity in atomically thin TaS2

et al. 2016

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The ability to exfoliate layered materials down to the single layer limit has presented the opportunity to understand how a gradual reduction in dimensionality affects the properties of bulk materials. Here we use this top–down approach to address the problem of superconductivity in the two-dimensional limit. The transport properties of electronic devices based on 2H tantalum disulfide flakes of different thicknesses are presented. We observe that superconductivity persists down to the thinnest layer investigated (3.5 nm), and interestingly, we find a pronounced enhancement in the critical temperature from 0.5 to 2.2 K as the layers are thinned down. In addition, we propose a tight-binding model, which allows us to attribute this phenomenon to an enhancement of the effective electron–phonon coupling constant. This work provides evidence that reducing the dimensionality can strengthen superconductivity as opposed to the weakening effect that has been reported in other 2D materials so far.

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Electric double-layer capacitance between an ionic liquid and few-layer graphene

Cited by 147 publications

References 39 publications

Four-Fold Increase in the Intrinsic Capacitance of Graphene through Functionalization and Lattice Disorder

Four-Fold Increase in the Intrinsic Capacitance of Graphene through Functionalization and Lattice Disorder

Charge transfer and storage in nanostructures

Enhanced superconductivity in atomically thin TaS2

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