Instantaneous impedance spectra of a non-stationary model electrical system

Darowicki, Kazimierz; Orlikowski, Juliusz; Lentka, Grzegorz

doi:10.1016/s0022-0728(00)00111-x

Cited by 93 publications

(39 citation statements)

References 8 publications

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“…However, for the V/H 3 PO 4 system, the characteristics of which ) undergo permanent drift due to rather high rate of vanadium dissolution, even in the region of (partial) passivation, typical impedance measurements supply data of limited reliability. Therefore, we used the novel technique introduced and developed by the group of Darowicki et al [31][32][33][34] in which the impedance spectrum can be collected also for the non-steady state, i.e., in this case drifting, but nonoscillatory state. The essential principle of the method is the following: applied potential is modified with perturbation signal, which is a package of sinusoidal voltage signals with amplitude equal for all components but different frequencies and phase angles.…”

Section: Impedance Characteristics Of the V/h 3 Po 4 Systemmentioning

confidence: 99%

Electrochemical oscillations and bistability during anodic dissolution of vanadium electrode in acidic media—part I. Experiment

Gorzkowski

Wesołowska

Jurczakowski

et al. 2011

J Solid State Electrochem

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Dynamic instabilities, current oscillations and bistability observed during anodic dissolution of both stationary and rotating disk vanadium electrode in acidic phosphoric media, were reported using both dc and ac techniques. The effect of various experimental conditions, concentration of H 3 PO 4 , temperature, disk rotation rate, and external resistance, was analyzed. Systematic studies allowed the construction of bifurcation diagrams, showing the regions of oscillations and bistability, including the complex behaviors like coexistence of both dynamic regimes. Analogous comparative measurements and analyses were performed for other media-sulfuric, nitric, perchloric, and trifluoroacetic acids-also indicating complex dynamic behaviors. These complexities arise not only due to the difficulties with the precise identification of the composition of the passive layer in every acid but are also due to relatively fast dissolution of V electrode, even in the presence of passive layer, which causes permanent drift of the system's characteristics. Due to these experimental difficulties, theoretical modeling seems to be an appropriate method to analyze the essential nonlinear dynamic properties of the studied system.

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Section: Impedance Characteristics Of the V/h 3 Po 4 Systemmentioning

confidence: 99%

Electrochemical oscillations and bistability during anodic dissolution of vanadium electrode in acidic media—part I. Experiment

Gorzkowski

Wesołowska

Jurczakowski

et al. 2011

J Solid State Electrochem

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“…Bu işlemlerden sonra, numunenin yüzeyi saf suyla yıkanarak, asetonla silinip iyice kurutulmuştur. [14] yapılan bir çalışmada bilim dünyasına yeni bir elektrokimyasal yöntem olan Dinamik Elektrokimyasal Empedans Spektroskopisi (DEIS) sunulmuştur. Geliştirilen bu yöntem, başta çukur korozyonunun oluşum mekanizmasını açıklamak [15], organik kaplamalarda zamanla oluşan hasarlarda meydana gelen korozyon mekanizmasını incelemek [16] [24].…”

Section: Korozyon Hücresinin Hazırlanmasıunclassified

TOZ METALURJİSİ İLE ELDE EDİLEN DÜŞÜK KARBON ÇELİĞİNİN %3.5 NaCl ORTAMINDAKİ KOROZYONUNA NİYOBYUM VE VANADYUMUN ETKİSİ

Uygur¹,

Gerengi²,

Yıldız³

et al. 2017

NWSA

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ÖZ THE EFFECT OF NIOBIUM AND VANADIUM ON CORROSION OF LOW CARBON STEEL OBTAINED BY POWDER METALLURGY IN 3.5%NaCl ENVIRONMENT ABSTRACTIn this study, corrosion mechanism of new alloys produced with addition of niobium and vanadium at the ratio of 0.05 wt. % and 0.075 wt. % into chemical composition of reference sample was investigated in 3.5% NaCl environment. The Dynamic Electrochemical Impedance Spectroscopy (DEIS) method allowing instantaneous detection of corrosion mechanism was used for the first time with this study for determining the effect of micro alloy elements on corrosion. Surface morphology of the prepared samples were compared with electrochemical data examined by using optical microscope at the end of 15 hour DEIS experiments. According to experimental results, the increase in amount of niobium and vanadium indicated that produced new alloys decreased corrosion rate occurring in 3.5% NaCl environment. R ct value obtained at the end of experiment show increased averagely at rate of 44-57% with the addition of alloy elements. Obtained DEIS data and optical images support each other. It was observed that there were more corrosion and accordingly deformation on surface of sample without addition of alloy elements.

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“…Smith and coworkers pioneered fast FFT methods [2][3][4][5][6][7][8][9], and others such as Bond [10,11], Osaka [12], Popkirov [13][14][15][16], Rosvall [17,18], Darowicki [19][20][21][22][23], Roy [24][25][26][27][28][29], Ragoisha [30][31][32][33], Hubin [34][35][36][37][38], Itagaki [39] and their coworkers have made advances through newer generations of computer technology and introduction of new algorithms. Smith's early work focused on fast measurements but not the dynamic aspect: the potential was stepped and then the measurement made after a settling time.…”

Section: Introductionmentioning

confidence: 99%

“…Only later was voltammetry incorporated [7], and in only one case was the influence of sweep rate on the measurement considered [9]. Most subsequent workers preferred small potential steps, and continuous sweep FFT methods were popularized later by Darowicki [19][20][21][22][23], Roy [24][25][26][27][28][29] and Bond [11]. Ragoisha's potentiodynamic method introduced wavelets [30][31][32][33], but with 2 mV steps at 2 mV s −1 is strictly a staircase waveform.…”

Section: Introductionmentioning

confidence: 99%

Dynamic electrochemical impedance spectroscopy, for electrocatalytic reactions

Sacci

Seland

Harrington

2014

Electrochimica Acta

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Dynamic electrochemical impedance spectroscopy with the ac signal applied while sweeping the potential is a powerful method to study reaction mechanisms of surface electrochemical reactions. The ability to reliably measure low frequencies while sweeping is key to its successful implementation. Numerical modeling of a simple adsorption reaction is used to decide how fast the potential sweep can be at a given frequency. Careful baseline subtraction is crucial to achieve accurate results. Hardware and software implementing this method are described. With attention to issues of resolution and using the baseline correction algorithm described, accurate results can be obtained down to about 1 Hz under practical conditions. Sample experimental data is validated using the Kramers-Kronig transform and a consistency test involving the voltammogram slope and the low frequency data.

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Instantaneous impedance spectra of a non-stationary model electrical system

Cited by 93 publications

References 8 publications

Electrochemical oscillations and bistability during anodic dissolution of vanadium electrode in acidic media—part I. Experiment

Electrochemical oscillations and bistability during anodic dissolution of vanadium electrode in acidic media—part I. Experiment

TOZ METALURJİSİ İLE ELDE EDİLEN DÜŞÜK KARBON ÇELİĞİNİN %3.5 NaCl ORTAMINDAKİ KOROZYONUNA NİYOBYUM VE VANADYUMUN ETKİSİ

Dynamic electrochemical impedance spectroscopy, for electrocatalytic reactions

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