Energy applications of ionic liquids

Wishart, James F.

doi:10.1039/b906273d

Cited by 464 publications

(366 citation statements)

References 96 publications

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“…Unfortunately, the operating voltage range of these devices barely exceeds 1 V, making them non-functional for many applications. Unlike water-based electrolytes, ionic liquids (ILs) provide an attractive alternative to these conventional electrolytes owing to their wide electrochemical window and high ionic conductivity, as well as good thermal stability and non-volatility 29 . These interesting properties of ILs can be hybridized with another solid component (for example, polymer, silica, and so on) to form gel-like electrolytes called ionogels 30 .…”

Section: Fabrication Of Laser-scribed Graphene Micro-supercapacitorsmentioning

confidence: 99%

Scalable fabrication of high-power graphene micro-supercapacitors for flexible and on-chip energy storage

2013

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The rapid development of miniaturized electronic devices has increased the demand for compact on-chip energy storage. Microscale supercapacitors have great potential to complement or replace batteries and electrolytic capacitors in a variety of applications. However, conventional micro-fabrication techniques have proven to be cumbersome in building cost-effective micro-devices, thus limiting their widespread application. Here we demonstrate a scalable fabrication of graphene micro-supercapacitors over large areas by direct laser writing on graphite oxide films using a standard LightScribe DVD burner. More than 100 micro-supercapacitors can be produced on a single disc in 30 min or less. The devices are built on flexible substrates for flexible electronics and on-chip uses that can be integrated with MEMS or CMOS in a single chip. Remarkably, miniaturizing the devices to the microscale results in enhanced charge-storage capacity and rate capability. These microsupercapacitors demonstrate a power density of B200 W cm À 3 , which is among the highest values achieved for any supercapacitor.

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Section: Fabrication Of Laser-scribed Graphene Micro-supercapacitorsmentioning

confidence: 99%

Scalable fabrication of high-power graphene micro-supercapacitors for flexible and on-chip energy storage

2013

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“…It is also an excellent electrode material that can be used for the conversion of light energy into electrical energy because of its semiconductor properties. Its wide applications such as supercapacitors, dye-sensitized solar cells, quantum-dot-sensitized solar cells, lithium ion batteries, photoelectrolysis, water splitting, biosensors, photochromic devices, self-cleaning, and extremely thin absorber (ETA) solar cells have already been explored [8][9][10][11][12][13][14][15][16][17] . TiO 2 films can be synthesized by many chemical and physical deposition techniques, such as chemical vapor deposition, spin coating or spin casting, atomic layer deposition, molecular beam epitaxy, sputtering, cathodic arc deposition, electrospray deposition, sol-gel process 18 .…”

Section: Introductionmentioning

confidence: 99%

Investigations on the Synthesis, Optical and Electrical Properties of TiO2 Thin Films by Chemical Bath Deposition (CBD) method

2016

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Titanium dioxide (TiO 2 ) thin films were prepared by Chemical Bath Deposition (CBD) method. The X-ray diffraction (XRD) analysis was used to examine the structure and to determine the crystallite size of TiO 2 thin film. The surface morphology of the film was studied using Scanning Electron Microscopy (SEM).The optical properties were studied using the UV-Visible and photoluminescence (PL) spectrum. Optical constants such as band gap, refractive index, extinction coefficient and electric susceptibility were determined. The FT-IR spectrum revealed the strong presence of TiO 2 . The dielectric properties of TiO 2 thin films were studied for different frequencies and different temperatures. The AC electrical conductivity test revealed that the conduction depended both on the frequency and the temperature. Photoconductivity study was carried out in order to ascertain the positive photoconductivity of the TiO 2 thin films.

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“…Theoretically (i.e., excluding the ion-pairing question 22 ) the upper limit of 'concentrated electrolytes' pertains to molten salts, which about room temperature are also being referred to as ionic liquids (IL), 5,6 i.e., solvent-free electrolytes. Besides the multiple applications, IL either with or without dilution also pose several physicochemical properties that extend the phenomenology of concentrated electrolytes: (i ) multiple timescales, 17,32 (ii ) self-assembly, [33][34][35] and (iii ) non-monotonic variation (exhibiting qualitatively three distinct regions) of EDL with concentration, 15,36 a.k.a., the phenomenon of under-screening.…”

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confidence: 99%

“…[5][6][7] The optimized design of these devices requires the mechanistic spatiotemporal understanding of ionic arrangement and charge transport in electrolytes. Although the physicochemical aspects of electrolyte solutions have been extensively studied, a series of recent experimental and computational results [8][9][10][11][12][13][14][15][16][17][18][19] reflects knowledge gaps even in the context of basic science.…”

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confidence: 99%

From Solvent-Free to Dilute Electrolytes: Essential Components for a Continuum Theory

Gavish

Elad

Yochelis

2017

J. Phys. Chem. Lett.

106

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The increasing number of experimental observations on highly concentrated electrolytes and ionic liquids show qualitative features that are distinct from dilute or moderately concentrated electrolytes, such as self-assembly, multiple-time relaxation, and under-screening, which all impact the emergence of fluid/solid interfaces, and transport in these systems. Since these phenomena are not captured by existing mean field models of electrolytes, there is a paramount need for a continuum framework for highly concentrated electrolytes and ionic liquids. In this work, we present a self-consistent spatiotemporal framework for a ternary composition that comprises ions and solvent employing free energy that consists of short and long range interactions, together with a dissipation mechanism via Onsagers' relations. We show that the model can describe multiple bulk and interfacial morphologies at steady-state. Thus, the dynamic processes in the emergence of distinct morphologies become equally as important as 1

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Energy applications of ionic liquids

Cited by 464 publications

References 96 publications

Scalable fabrication of high-power graphene micro-supercapacitors for flexible and on-chip energy storage

Scalable fabrication of high-power graphene micro-supercapacitors for flexible and on-chip energy storage

Investigations on the Synthesis, Optical and Electrical Properties of TiO2 Thin Films by Chemical Bath Deposition (CBD) method

From Solvent-Free to Dilute Electrolytes: Essential Components for a Continuum Theory

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