Transient Relaxations of Ionic Conductance during Growth of Porous Anodic Alumina Films: Electrochemical Impedance Spectroscopy and Current Step Experiments

Ide, Shinsuke; Mishra, Pratyush; Hebert, Kurt R.

doi:10.1016/j.electacta.2016.11.019

Cited by 7 publications

(7 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the low-frequency range (from 1 to 10 2 Hz), there is an induction loop that arises from linearization of non-linear behaviour of the system. This phenomenon can be referred to the defects relaxation in the barrier layer 26 or to the passage of charged particles against electric field gradient. 25 In the high-frequency range (from 10 2 to 10 5 Hz), a semicircle was observed.…”

Section: Resultsmentioning

confidence: 99%

“…25 In the high-frequency range (from 10 2 to 10 5 Hz), a semicircle was observed. As a result, the equivalent circuit also complicates: 26 a resistor (R P ) and an in-series combination of a resistor (R L ) and an inductor (L) are connected in parallel to the capacitor (С i ) (see inset in Fig. 2).…”

Section: Resultsmentioning

confidence: 99%

“…However, the published data on in situ measurements in acidic electrolytes are scarce. [24][25][26][27] Articles [24][25][26] are mainly focused on the study of the electronic properties of the barrier layer and the growth mechanism of AAO pours films. To the best of our knowledge, the barrier layer properties during (in situ) and after (ex situ) the anodizing process has been compared only in the case of anodizing of aluminium alloys, 27 and the results are uncertain.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Probing Barrier Oxide Layer of Porous Anodic Alumina by In Situ Electrochemical Impedance Spectroscopy

Leontiev

Napolskii

2021

J. Electrochem. Soc.

View full text Add to dashboard Cite

Electrochemical impedance spectroscopy (EIS) is a unique tool for both ex situ and in situ studies of the barrier layer thickness of anodic aluminium oxide (AAO). Here EIS is applied to study porous AAO formed by anodizing of high-purity Al foils in 0.3 M sulphuric acid and 0.3 M oxalic acid electrolytes. It is shown that in the high-frequency range, in situ EIS spectra coincide with the ex situ ones. Thus, the thickness of the barrier layer at the pore bases does not change after the end of the anodic polarization. The barrier layer thickness (h) is governed by the anodizing potential (U) according to the equation h = 1.03(2) nm·V−1·U + 2.2(3) nm. Features of the current transients observed during potentiostatic anodizing are discussed. It has been proved that a local maximum of current at the initial stage of anodizing corresponds to the maximum of the aluminium electroactive surface area arising due to the rearrangement of pores.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Probing Barrier Oxide Layer of Porous Anodic Alumina by In Situ Electrochemical Impedance Spectroscopy

Leontiev

Napolskii

2021

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…In serial connection to

there is another electrical circuit that describes the anodic oxide layer formation through a parallel arrangement of three electrical components: the polarization resistance

, which includes both the resistance of the barrier and the diffusion resistance of the pore channels, the double-layer capacity

, and a serial arrangement of the resistance

as well as the inductor

. According to the literature, the inductive behavior can be explained by the relaxation of charge-carrying defects [ 18 ].…”

Section: Methodsmentioning

confidence: 99%

Simulation-Assisted Process Design and Experimental Verification of Laterally Confined Oxide Areas Generated with Continuous Electrolytic Free Jet on EN AW-7075 Aluminum Alloy

et al. 2023

View full text Add to dashboard Cite

Local anodization with a free electrolyte jet is a suitable solution for locally confined surface functionalization without additionally required preparation of the parts. However, the geometrical formation of the anodic oxide layer in jet-based anodization is not yet sufficiently understood. In this study, numerical calculations based on physical descriptions are used to describe the lateral and vertical oxide formation on aluminum alloy EN AW-7075. The required electrical resistance and capacitance were determined by immersion-based anodization and implemented into the numerical simulation model to evaluate the electrical conductivity of the porous layer. The simulation results showed an electrical conductivity of 2.6 ∙ 10−6 S/m for the porous layer. Subsequently, a model for jet-based anodization was developed and the previous results were implemented to calculate the oxide formation. The simulation results showed decreasing oxide layer thickness at increasing radial distance from the center of the jet, which corresponds to experimental results. The simulation model was validated by varying the current efficiency from 5% to 90%, where similar developments of the anodic oxide layer thickness compared with experimental results were determined at 5%.

show abstract

“…Houser et al 33 and Mishra et al 14 developed the quantitative viscous model for oxide growth respectively. According to the equivalent circuit, Ide et al 34 derived Nyquist plot and Alves et al 35 quantify the anodizing process.…”

mentioning

confidence: 99%

A Mathematical Model for the Growth of Anodic TiO₂Nanotubes under Higher Current Density

Zhao

Cui

et al. 2017

J. Electrochem. Soc.

View full text Add to dashboard Cite

The mechanism of titanium anodization is unclear yet. The total current includes ionic and electronic currents. The ionic current drives oxide film growth and the electronic current causes oxygen bubble emission. Based on a former derivation, a mathematical model of voltage-time transient curves during galvanostatic anodizing under higher current densities (>10 mA/cm 2 ) was developed. The high-current model shares the same mechanism of oxide formation with the former low-current model, but the calculation of electric field is different. The results show high accuracy of fitted curves, and prove the linear correlation between nanotube length and ionic current. The two models vary in the applicable ranges, because the relation between ionic currents and electric field is different under high and low field.

show abstract

Transient Relaxations of Ionic Conductance during Growth of Porous Anodic Alumina Films: Electrochemical Impedance Spectroscopy and Current Step Experiments

Cited by 7 publications

References 39 publications

Probing Barrier Oxide Layer of Porous Anodic Alumina by In Situ Electrochemical Impedance Spectroscopy

Probing Barrier Oxide Layer of Porous Anodic Alumina by In Situ Electrochemical Impedance Spectroscopy

Simulation-Assisted Process Design and Experimental Verification of Laterally Confined Oxide Areas Generated with Continuous Electrolytic Free Jet on EN AW-7075 Aluminum Alloy

A Mathematical Model for the Growth of Anodic TiO₂Nanotubes under Higher Current Density

Contact Info

Product

Resources

About

Transient Relaxations of Ionic Conductance during Growth of Porous Anodic Alumina Films: Electrochemical Impedance Spectroscopy and Current Step Experiments

Cited by 7 publications

References 39 publications

Probing Barrier Oxide Layer of Porous Anodic Alumina by In Situ Electrochemical Impedance Spectroscopy

Probing Barrier Oxide Layer of Porous Anodic Alumina by In Situ Electrochemical Impedance Spectroscopy

Simulation-Assisted Process Design and Experimental Verification of Laterally Confined Oxide Areas Generated with Continuous Electrolytic Free Jet on EN AW-7075 Aluminum Alloy

A Mathematical Model for the Growth of Anodic TiO2Nanotubes under Higher Current Density

Contact Info

Product

Resources

About

A Mathematical Model for the Growth of Anodic TiO₂Nanotubes under Higher Current Density