The electrochemical interface of Ag(111) in 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ionic liquid—A combined in-situ scanning probe microscopy and impedance study

Li, Mian-Gang; Chen, Li; Zhong, Yunxin; Chen, Zhaobin; Yan, Jiawei; Mao, Bing‐Wei

doi:10.1016/j.electacta.2015.12.227

Cited by 42 publications

(39 citation statements)

References 63 publications

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“…However, by fitting Cole-Cole functions to the frequency normalized admittances of the electrodes instead of the interfaces, the electrolyte resistance blurred the determined capacitances. The same applies also for other impedance measurements from the same group [9] and to the measurements of Li et al [10] for Ag(111) electrode in EMITFSI. 5.…”

Section: Metal/ionic Liquid Interfacesmentioning

confidence: 81%

Electrochemical impedance spectroscopy in interfacial studies

Pajkossy

Jurczakowski

2017

Current Opinion in Electrochemistry

128

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An important role of the electrochemical impedance spectroscopy (EIS) is the characterization of the electrical double layer formed at the electrode/electrolyte interfaces. The phenomenological double layer studies with an aqueous and ionic liquid electrolytes are reviewed with a conclusion that the double layer capacitance is frequency dependent as the rule rather than the exception. We discuss the impedance consequences of the nonuniform current distribution along the electrochemical interface, which also contributes to the apparent frequency dependence of the capacitance. Finally we show recent articles on nonconventional EIS techniques with high lateral resolution or enabling fast measurements.

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Section: Metal/ionic Liquid Interfacesmentioning

confidence: 81%

Electrochemical impedance spectroscopy in interfacial studies

Pajkossy

Jurczakowski

2017

Current Opinion in Electrochemistry

128

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“…Introduction of overscreening into the theory [8] leads to a complicated set of equations, but its effect on capacitance is tricky: although it broadens somewhat the capacitance curve, alone, without the introduction of the compact layer, it does not substantially reduce the 1 Their existence has also been detected directly by X-ray [6,[45][46][47][48][49] and indirectly by scanning nano-probe techniques [50][51][52][53][54][55][56]. Generally, oscillating profiles and overscreening in dense ionic solutions have a long history.…”

Section: Introductionmentioning

confidence: 99%

“…The authors of Refs. 72-74 studied the effects of short-range correla-2 Experimental verifications of oscillating structures in the double layer of ionic liquids [6,[45][46][47][48][49][50][51][52][53][54][55][56] have all been detected near ideally atomically flat surfaces, and we are not aware of any systematic investigations of how they may be perturbed or eliminated by the atomic roughness of the surface [56]. However, computer simulations have specially studied step-edge defects in carbon electrodes [65,66] and surface roughness on a similar scale to molecular dimensions [5,67], which have demonstrated that the resonance effect could be damped.…”

Section: Introductionmentioning

confidence: 99%

Mean-Field Theory of Electrical Double Layer In Ionic Liquids with Account of Short-Range Correlations

Goodwin

Feng

Kornyshev

2017

Electrochimica Acta

149

190

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We develop the theory of the electrical double layer in ionic liquids as proposed earlier by Kornyshev (2007). In the free energy function we keep the so called 'short-range correlation terms' which were omitted there. With some simplifying assumptions, we arrive at a modified expression for differential capacitance, which makes differential capacitance curves less sharply depending on electrode potential and having smaller values at extrema than in the previous theory. This brings the results closer to typical experimental observations, and makes it appealing to use this formalism for treatment of experimental data. Implications on Debye length and the extent of ion paring in ionic liquids are then briefly discussed.

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“…Roling et al [47,48,[50][51][52] suggested the slow process on the time scale of second may be related to structural reconstructions of the metal electrode surface and/or ion redistributions in the strongly bound ion-layer, which has been demonstrated by in-situ scanning tunneling microscopy (STM) [53,54]. Anderson et al [55] attributed the slow process to the adsorption capacitance of the ions, while Pajkossy et al [56] attributed the slow process to the dynamics of anions/cations replacement in the com- [57] revealed that the EDL was formed by three charged interior layered structures, while strong adsorption was absent in the interface. Meanwhile, an electric equivalent circuit involving different capacitance processes of different time scales was proposed, and the slow process may be due to the hindrance of reorientation and/or redistribution of ions in the more ordered and robust inner layer region.…”

Section: Electric Double Layer and Differential Capacitancementioning

confidence: 99%

Ionic liquid electrolytes in electric double layer capacitors

et al. 2019

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Electric double layer capacitors (EDLCs), which store free charges on the electrode surface via non-Faradaic process, balanced by the electric double layer on the electrolyte side, exhibit excellent cycle stability and high power density. Though EDLCs are considered as promising energy storage devices, the charges stored on the electrode surface in EDLCs are much lower than those in batteries. Ionic liquids (ILs), as a new type of electrolytes in EDLCs, are capable to deliver high energy density, due to their excellent physicochemical properties and wide electrochemical window. In this review, we focus on the widely studied IL electrolytes for EDLCs, including pure ILs, IL/IL binary electrolytes, IL/organic solvent mixtures, as well as functionalized ILs, with attention on the relationship between the structures of different IL-based electrolytes and the energy storage properties in EDLCs. For imidazolium-and ammonium-based IL electrolytes which are most widely studied in EDLCs, the former generally have higher gravimetric specific capacitance, while the latter exhibit wider electrochemical window. The modifications of functional group substituted can be an effective strategy to enhance the gravimetric specific capacitance of the latter and thus improve the energy density of EDLCs.

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The electrochemical interface of Ag(111) in 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ionic liquid—A combined in-situ scanning probe microscopy and impedance study

Cited by 42 publications

References 63 publications

Electrochemical impedance spectroscopy in interfacial studies

Electrochemical impedance spectroscopy in interfacial studies

Mean-Field Theory of Electrical Double Layer In Ionic Liquids with Account of Short-Range Correlations

Ionic liquid electrolytes in electric double layer capacitors

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