A simple model of ac hopping surface conductivity in ionic liquids

Raicopol, Matei; Dascalu, C.; Devan, C.; Alexe-Ionescu, A.L.; Barbero, Giovanni

doi:10.1016/j.elecom.2019.01.010

Cited by 5 publications

(7 citation statements)

References 20 publications

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“…Our model contains, intrinsically, a frequency dependence of the phenomenological parameter describing the surface exchange of electric charge on the frequency of the external field. We would expect that this random-walk model for the charge exchange on the electrodes depends on a DC bias applied between the electrodes, due to modifications on the energy barriers on them, not considered in ref . It is our aim also to verify this hypothesis.…”

Section: Introductionmentioning

confidence: 91%

“…This fact suggests that the behavior of the ions in the vicinity of the electrodes depends on the frequency and that a different mechanism of interaction between ions and electrodes has to be considered. In a recent paper, 8 the boundary conditions proposed to describe the charge exchange occurring in an ionic liquid in contact with nonblocking electrodes have been reconsidered in a dynamic situation for an ionic liquid. The model presented in ref 8 is based on the assumption that the current related to the charge exchange is proportional to the variation of the bulk density of ions with respect to the value of equilibrium.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…In a recent paper, the boundary conditions proposed to describe the charge exchange occurring in an ionic liquid in contact with nonblocking electrodes have been reconsidered in a dynamic situation for an ionic liquid. The model presented in ref is based on the assumption that the current related to the charge exchange is proportional to the variation of the bulk density of ions with respect to the value of equilibrium. The analysis has been done in the framework of the linear analysis of a system characterized by a distribution of relaxation times. , The theoretical predictions of the model are in good agreement with the experimental result reported in ref , where cells of ionic liquid crystals limited by fluorine-doped tin oxide electrodes have been investigated.…”

Section: Introductionmentioning

confidence: 99%

“…In the present paper, we apply the model developed in ref to an electrolytic cell of water and KCl, in the shape of a slab, limited by gold electrodes subjected to an AC external electric field. Our model contains, intrinsically, a frequency dependence of the phenomenological parameter describing the surface exchange of electric charge on the frequency of the external field.…”

Section: Introductionmentioning

confidence: 99%

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Random Energy Barrier Model for AC Electrode Conductivity

2019

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We investigate the electric response of an electrolytic cell of water and KCl, limited by gold electrodes, to derive information on the role of the electrodes in the spectra of the real and imaginary parts of the electric impedance of the cell. Our experimental data can be interpreted by means of the Poisson–Nernst–Planck model with Ohmic boundary conditions for the electrodes, where the surface conductivity is consistent with that derived by a random-walk model for the charge exchange on the electrodes. By using a best-fit procedure, the direct current (DC) conductivity and the hopping time are determined. The measurements have been performed in the absence and presence of a DC bias. In the absence of DC bias, the agreement between the theoretical predictions and the experimental data is good over the full explored frequency range. On the contrary, in the presence of the DC bias, the theoretical predictions in the low-frequency range do not describe the experimental results very well and the agreement decreases, increasing the value of the bias. This result indicates that the hopping phenomenon describing the conduction across the electrodes has peculiar characteristics different from those of the bulk. The dependence of the hopping time and of the DC conductivity on the electric field is reasonably well described by the existing models proposed for the hopping conduction in the bulk.

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Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Random Energy Barrier Model for AC Electrode Conductivity

2019

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Solvation‐Involved Nanoionics: New Opportunities from 2D Nanomaterial Laminar Membranes

et al. 2019

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Nanoporous laminar membranes composed of multilayered 2D nanomaterials (2D‐NLMs) are increasingly being exploited as a unique material platform for understanding solvated ion transport under nanoconfinement and exploring novel nanoionics‐related applications, such as ion sieving, energy storage and harvesting, and in other new ionic devices. Here, the fundamentals of solvation‐involved nanoionics in terms of ionic interactions and their effect on ionic transport behaviors are discussed. This is followed by a summary of key requirements for materials that are being used for solvation‐involved nanoionics research, culminating in a demonstration of unique features of 2D‐NLMs. Selected examples of using 2D‐NLMs to address the key scientific problems related to nanoconfined ion transport and storage are then presented to demonstrate their enormous potential and capabilities for nanoionics research and applications. To conclude, a personal perspective on the challenges and opportunities in this emerging field is presented.

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