Impedance of solid electrolyte systems

Bukun, N. G.; Ukshe, A. E.

doi:10.1134/s1023193509010030

Cited by 23 publications

(5 citation statements)

References 34 publications

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“…under the condition en i = const) show [22,25] that the capacitance of a heterojunction is an increasing function of time, like in the case of galvanostatic charging. This capacitance behavior agrees with a great number of experimental data reported in the literature (e.g., [10,32,33]). On the other hand, the description of space charge relaxation in terms of the structure-dynamic approach disagrees with the interpretation in [32,33] based on the model of EDL adsorption relaxation and the concept of minor charge carriers.…”

Section: Modeling Of Processes In the Galvanostatic Modesupporting

confidence: 81%

“…This capacitance behavior agrees with a great number of experimental data reported in the literature (e.g., [10,32,33]). On the other hand, the description of space charge relaxation in terms of the structure-dynamic approach disagrees with the interpretation in [32,33] based on the model of EDL adsorption relaxation and the concept of minor charge carriers. According to that model, large adsorption capacitance C ad = const (C ad >> C = const) and Warburg impedance are introduced into equivalent electrical circuits of EC b /AdSIC heterojunctions to fit the calculated and experimental data on the blocking heterojunction response to low-frequency external influence.…”

Section: Modeling Of Processes In the Galvanostatic Modesupporting

confidence: 81%

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Maxwell displacement current and nature of Jonsher’s “universal” dynamic response in nanoionics

Despotuli

Андреева

2014

Ionics

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New notion -Maxwell displacement current on potential barrier -is introduced in the structuredynamic approach of nanoionics for description of collective phenomenon: coupled ion-transport and dielectric-polarization processes occurring during ionic space charge formation and relaxation in non-uniform potential relief. We simulate the processes: (i) in an electronic conductor/advanced superionic conductor (AdSIC) ideally polarizable coherent heterojunction, (ii) in a few strained monolayers of solid electrolyte (SE) located between two AdSICs forming coherent interfaces with SE. We prove the sum of ionic current over any barrier and Maxwell displacement current through the same barrier is equal to the current of current generator.-Universal‖ dynamic response, Re*()   n (n < 1), was found for frequency-dependent conductivity *() for case (ii) with an exponential distribution of potential barrier heights in SE. The nature of phenomenon is revealed. The amplitudes of non-equilibrium ion concentrations (and induced voltages) in space charge region of SE change approximately as   -1 . Amplitudes yield a main linear contribution to Re*(). The deviation from linearity is provided by the cosine of phase shift  between current and voltage in SE-space charge but cos depends relatively slightly on  (near constant loss effect) for coupled ion-transport and dielectric-polarization processes.The canonical physical-mathematical formalism for the description of ion transport in solids [1] is based on the concept of a regular crystalline potential relief, i.e. the heights  of potential barriers are const. As a consequence, ion-transport characteristics (mean-square displacement, diffusion coefficient, mobility, activation energy) have a clear physical meaning only at averaging in the scale much exceeding the length of an elementary ion jump. However, the variation of  with a space coordinate x can be considerable in objects of solid state ionics. For example, local regions with  variation about 1 eV/nm exist in disordered solid electrolytes (SE) [2][3][4] and in crystals of superionic conductors (SIC) [5]. Various degrees of ordering occur near surfaces and in the region of interphase and intercrystalline boundaries [6] where specific ion dynamics can arise on the nanoscale [7] due to a non-uniform potential relief. The interface structure exhibits itself in, e.g., frequency-capacitance characteristics of EC/SIC heterojunctions [8][9][10]. The classification of solid ionic conductors [8-10] distinguishes a class of advanced superionic conductors (AdSIC) among SE and SIC because AdSIC-crystal structure is close to optimal for fast ion transport (FIT). This crystal structure determines the record high level of iontransport characteristics. The FIT structure represents a rigid sub-lattice of immobile ions in which there are the crystallographic positions interconnected with each other by low potential barriers (conduction tunnels) for hopping mobile ions. The number of such positions is several times larger ...

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Section: Modeling Of Processes In the Galvanostatic Modesupporting

confidence: 81%

Section: Modeling Of Processes In the Galvanostatic Modesupporting

confidence: 81%

Maxwell displacement current and nature of Jonsher’s “universal” dynamic response in nanoionics

Despotuli

Андреева

2014

Ionics

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“…Polarization regions can form at these boundaries, which represent potential barriers to the transport of diffusing particles. Since, when using cells with blocking electrodes, one can only talk about the diffusion of silver ions, this simultaneously indicates ionic charge transfer [16,17], which is determined, in particular, by the well-known Nernst-Einstein relation. The frequencies of polarization change in the alternating electric field will depend on the nature of the conjugated phases in the electrochemical cells used.…”

Section: Resultsmentioning

confidence: 99%

Nature of electrotransport and mechanisms of relaxation in an alternating field in silver intercalated hafnium diselenide

V.G.

2022

Physics of the Solid State

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The features of charge transfer in electrochemical cells with electrodes of various types and with an intercalated compound AgxHfSe2 (x=0.1,0.2) as an electrolyte were studied by the method of impedance spectroscopy. Based on the analysis of the obtained data, the presence of mixed electron-ionic conductivity in this compound was shown, and the numbers of ionic and electron transfer in these compounds were determined for the first time. The different nature of relaxation processes in mixed and ionic charge transfer is shown. Keywords: hafnium diselenide, silver, intercalation, impedance, ionic and electronic conductivity.

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“…According to [8][9][10][11][12][13][14][15][16][17][18], an increase in R 1 and a decrease in C 2 can be interpreted as corrosion inhibition. A decrease in the double layer capacitance C 1 indicates that the CIN is adsorbed on the metal, which reduces the fraction of its electrochemically active surface.…”

Section: Resultsmentioning

confidence: 99%

IFKhAN-140, a chamber corrosion inhibitor for brass

2020

Int. J. Corros. Scale Inhib.

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A combination of accelerated electrochemical (potentiodynamic and impedance) and corrosion methods (performed under intense condensation of moisture and neutral salt fog), as well as outdoor tests were used to study the protective aftereffect of adsorption films formed on brass on exposure to a mixture of octadecylamine and benzotriazole (IFKhAN-140) at 100 and 120℃. It was shown that the components of IFKhAN-140 synergistically enhance the protective aftereffect of the adsorption layers. The protective aftereffect of the adsorbed inhibitor films is most pronounced at a chamber treatment temperature of 120℃, although at 100℃ the corrosion inhibition factors are also high. The protective properties of the inhibitor at the chamber treatment temperatures studied increase symbiotically with the treatment duration. However, chamber treatment for more than one hour leads to undesirable metal tarnishing. Using the ellipsometry method, it was found that the thickness of the surface films on brass that provides a significant increase in its corrosion resistance does not exceed 20 nm. The high protective properties of IFKhAN-140 toward steel, copper and brass at once allow it to be regarded as a formulation suitable for the protection of polymetallic products.

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Impedance of solid electrolyte systems

Cited by 23 publications

References 34 publications

Maxwell displacement current and nature of Jonsher’s “universal” dynamic response in nanoionics

Maxwell displacement current and nature of Jonsher’s “universal” dynamic response in nanoionics

Nature of electrotransport and mechanisms of relaxation in an alternating field in silver intercalated hafnium diselenide

IFKhAN-140, a chamber corrosion inhibitor for brass

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