Measurement Models for Electrochemical Impedance Spectroscopy: I . Demonstration of Applicability

Agarwal, Pankaj; Orazem, Mark E.; García‐Rubio, Luis H.

doi:10.1149/1.2069522

Cited by 321 publications

(242 citation statements)

References 19 publications

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“…In the high frequency region, several overlapping semicircles associated with lithiumion transport through a multilayered passivation film are observed (R SEI ). The multilayer characteristic of the passivation film is represented by multiple R C parallel circuits in series, akin to the Voight model [58]. At medium and low frequencies, the impedance contributions result primarily from the charge-transfer resistance (R CT ) and double-layer capacitance (C DL ) at the electrode/electrolyte interface, as well as solid-state diffusion through the active electrode materials (Warburg element) [59,60].…”

Section: Resultsmentioning

confidence: 99%

Graft copolymer-based lithium-ion battery for high-temperature operation

Osswald

Daniel

et al. 2011

Journal of Power Sources

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Section: Resultsmentioning

confidence: 99%

Graft copolymer-based lithium-ion battery for high-temperature operation

Osswald

Daniel

et al. 2011

Journal of Power Sources

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“…A cylindrical Plexiglass tube was fixed on top of the coated sample, exposing a surface area of 5 the Kramers-Kronig relations, the measurement model analysis described by Agarwal et al [12][13][14] was used. Typically data obtained at frequencies greater than 10 mHz were found to satisfy the Kramers-Kronig relations.…”

Section: Electrochemical Impedance Measurementsmentioning

confidence: 99%

Impedance analysis of the distributed resistivity of coatings in dry and wet conditions

Nguyen

Musiani

Orazem

et al. 2015

Electrochimica Acta

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A commercial coating (epoxy-polyaminoamide waterborne paint) deposited on a 2024 aluminium alloy was characterized by impedance measurements, first in dry conditions and then as a function of the immersion time in NaCl solutions (wet conditions). The behaviour of the dry coating was close to that of an ideal capacitor and could be accurately modelled with the power-law model corresponding to a constant phase element (CPE) behaviour. Upon immersion in NaCl solutions, the behaviour of the wet coating became progressively less ideal, i.e. farther from a capacitive behaviour. This result provided support to the hypothesis that an inhomogeneous uptake of the electrolyte solution was the cause of the often observed non-ideal responses of wet coatings. The experimental EIS data recorded for immersion times up to 504 hours were compared with models assuming either a power-law or an exponential variation of the coating resistivity along its thickness, respectively implying a phase angle independent of frequency or slightly dependent on it.

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“…7. For accurate simulation of the corrosion process the number of capacitive loops (time constants) were identified by Voight circuits according to the procedure proposed by Agarwal et al [24]. As was determined, the measured impedance spectra of pure Cr and as-deposited Cr + ZrO 2 coatings exhibit one capacitive loop in the medium frequencies range ∼ (1-10 kHz) and one capacitive loop in the low frequency domain.…”

Section: Tests Of Electrochemical Impedance Spectramentioning

confidence: 99%

Characterization of Cr–ZrO2 composite coatings electrodeposited from Cr(III) bath

Bikulčius¹,

Češūnienė²,

Selskienė³

et al. 2018

chemija

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The aim of this work was to incorporate ZrO 2 particles into a Cr matrix within the research work aimed at obtaining metal matrix composite coatings (CrZrO 2 ) under direct current and to evaluate their protective properties. A CrZrO 2 composite coating was deposited from an electrolyte based on trivalent chromium sulphate with formate-urea as a complexing agent containing various concentrations of ZrO 2 . Cross-section investigations have revealed that ZrO 2 particles incorporated into the Cr coating are uniformly distributed. The results indicate that ZrO 2 particles influence the microhardness, morphology and corrosion behaviour of Cr-ZrO 2 composite coatings obtained from the Cr(III) bath. Keywords: zirconium, electrodeposited films, SEM, XPS, EIS, interfaces INTRODUCTIONHard chromium electrodeposition is extensively used in modern industry as it provides good corrosion and wear resistances of the coatings obtained. Commonly, chromium coatings are deposited from hazardous hexavalent chromium baths. In view of a very high toxicity of Cr(VI) compounds, the development of an alternative hexavalent chromium plating process is urgently needed. According to the EU Regulation (EC) No. 1907/2006 the use of chromium trioxide baths for functional and decorative chromium plating will be forbidden or severely limited after 1 September 2017.Among many potential alternatives, trivalent chromium (Cr(III)) plating is considered as a very promising technology to replace conventional hexavalent Cr plating. Inasmuch as Cr coatings deposited in Cr(III) baths do not feature such good properties as Cr coatings deposited in Cr(VI) baths, efforts have been made to improve them by various methods.Electrochemical codeposition of inert particles in a metal matrix is a suitable technique to produce composite materials with new exploitation properties. Different hard dispersion phases distinguish themselves for different electrical conductivity and surface charge, therefore, to incorporate one or another hard disperse phase into a metallic matrix, specific deposition conditions are required [1].One of popular ceramic particles is ZrO 2 . It is known [2,3] that ZrO 2 has many superior properties, such as high G. Bikulčius, A. Češūnienė, A. Selskienė, A. Grigucevičienė, V. Jasulaitienė The aim of this work was to form a Cr(III)-ZrO 2 composite in an environment-friendly Cr(III) bath under the conditions of constant current and to study the incorporation of ZrO 2 disperse particles into the Cr matrix, the elemental composition of the Cr-ZrO 2 composite, surface microhardness (HV), surface morphology (SEM, XPS) and corrosion resistance (OCP, Tafel and EIS). EXPERIMENTALCr-ZrO 2 composite coatings were deposited from the Cr(III) bath containing Cr 2 (SO 4 ) 3 6H 2 O (150 g l -1 ), H 3 BO 3 (30 g l -1 ), Na 2 SO 4 (60 g l -1 ), Al 2 (SO4) 3 18H 2 O (120 g l -1 ), NaF (20 g l -1 ), HCOONa (27 g l -1 ), NH 2 COONH 2 (g l -1 ) under a 30 l h -1 agitation flow of compressed air with a direct current density of 0.2 A cm -2 and pH 2.0 at 20°C. This...

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Measurement Models for Electrochemical Impedance Spectroscopy: I . Demonstration of Applicability

Cited by 321 publications

References 19 publications

Graft copolymer-based lithium-ion battery for high-temperature operation

Graft copolymer-based lithium-ion battery for high-temperature operation

Impedance analysis of the distributed resistivity of coatings in dry and wet conditions

Characterization of Cr–ZrO2 composite coatings electrodeposited from Cr(III) bath

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