Identification of reaction mechanism for anodic dissolution of metals using Electrochemical Impedance Spectroscopy

Maddala, Jeevan; Sambath, Krishnaraj; Kumar, Vinod; Ramanathan, Surash

doi:10.1016/j.jelechem.2009.11.021

Cited by 28 publications

(28 citation statements)

References 27 publications

(42 reference statements)

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“…Besides, the frequency of each capacitive peak in the diagram is representative of a faradaic adsorption reaction in particular. This means that the species involved in the reaction and the reaction mechanism did not change with the temperature increase [18].…”

Section: Effect Of the Temperaturementioning

confidence: 97%

Impedance spectra of anodic dissolution of iron in distillery vinasse

Marriaga-Cabrales¹,

Martínez²

2014

Electrochimica Acta

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Section: Effect Of the Temperaturementioning

confidence: 97%

Impedance spectra of anodic dissolution of iron in distillery vinasse

Marriaga-Cabrales¹,

Martínez²

2014

Electrochimica Acta

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“…Two capacitance loops are observed for all the combinations of R sol and V ac0 . It is known that for a reaction with a single adsorbed intermediate species, the Faradaic process will lead to an arc at low frequencies, while the double layer capacitance would lead to a capacitive arc at high frequencies [34,35]. Since the value of the exponent b 1 is greater than b 2 , two capacitive loops are seen.…”

Section: Reaction With Adsorbed Intermediatementioning

confidence: 99%

Numerical investigations of solution resistance effects on nonlinear electrochemical impedance spectra

Santhanam

Ramani

Ramanathan

2011

J Solid State Electrochem

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The effect of solution resistance on the nonlinear electrochemical impedance spectra under quasi-potentiostatic conditions was investigated by numerical simulations. An electron transfer reaction, a reaction with an adsorbed intermediate and a reaction exhibiting negative resistance were chosen as the candidates and large amplitude perturbations were employed. The potential across the interface drifts initially and stabilizes after a certain time, which depends on the solution resistance and the kinetic parameter values. The fraction of the applied potential drop occurring across the metal-solution interface depends on the frequency and the amplitude of the perturbation as well as the value of solution resistance. This in turn leads to the possibility that, for a given conditions, a part of the spectrum may be acquired in the linear regime while the remaining part may be acquired in the nonlinear regime. The sensitivity of the Kramers Kronig transform (KKT) to identify these cases is evaluated. The results show that although the spectra are distorted by poorly conducting solution, the sensitivity of KKT to identify the nonlinear effects is not enhanced by the introduction of significant solution resistance.

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“…Thus simple dissolution always gives rise to a single semicircle as impedance pattern (23). Hence the simple direct dissolution model is ruled out.…”

Section: Reaction Mechanism Analysismentioning

confidence: 99%

“…According to the earlier studies systems showing three time constants can be successfully modeled by the models with two adsorbed intermediates (23). Catalytic mechanisms have been considered for the analysis of copper dissolution in acidic medium (11,24).…”

Section: Reaction Mechanism Analysismentioning

confidence: 99%

Analysis of Copper Dissolution in Glutamic Acid and Hydrogen Peroxide Using EIS

Ramanathan

Selvam

2011

ECS Trans.

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The dissolution of copper in solutions containing Glutamic acid and hydrogen peroxide is analyzed using EIS. Potentiodynamic polarization studies show that there is no strong passivating layer formed on the copper surface in solutions containing 0.5 wt% Glu and 0.1 vol% hydrogen peroxide. Electrochemical impedance spectra of copper in this solution at various overpotential were acquired and modeled using electrical equivalent circuit and reaction mechanism analysis. The results show that the reaction involves at least two adsorbed intermediates.

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Identification of reaction mechanism for anodic dissolution of metals using Electrochemical Impedance Spectroscopy

Cited by 28 publications

References 27 publications

Impedance spectra of anodic dissolution of iron in distillery vinasse

Impedance spectra of anodic dissolution of iron in distillery vinasse

Numerical investigations of solution resistance effects on nonlinear electrochemical impedance spectra

Analysis of Copper Dissolution in Glutamic Acid and Hydrogen Peroxide Using EIS

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