On-line measurement of cell impedance during charging and discharging process

Ślepski, Paweł; Darowicki, Kazimierz; Andrearczyk, Karolina

doi:10.1016/j.jelechem.2009.05.002

Cited by 25 publications

(11 citation statements)

References 25 publications

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“…Electrochemical processes that occur within single cells trigger the corresponding voltage changes for both the dc and ac components. Also, according to the Nyquist principle, appropriate detection of the ac component requires that the voltage signals from individual cells be registered with the speed that is at least double that of the highest component of the excitation frequency [17].…”

Section: Methodsmentioning

confidence: 99%

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Impedance monitoring of fuel cell stacks

Ślepski

Janicka

Darowicki

et al. 2014

J Solid State Electrochem

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This paper presents an innovative, electrochemical impedance method for monitoring of electrochemical behaviour of a multi-cell, direct methanol fuel cell (DMFC) device. This method not only provides classical voltage changes at successive cells but also allows their detailed impedance behaviour to be presented. Impedance characteristics of individual cells within a fuel cell stack (depending on actual operating conditions) are obtained via numerous electrochemical tasks, including simultaneous determination of each cell's impedances, performance optimization of the fuel cell stack and effective detection of faulty cells within the stack. The above concerns in situ conditions. The effectiveness of the present method was studied here on a seven-cell, commercially made DMFC stack. In order to effectively detect faulty cells, selected experiments were carried out with insufficient amount of oxygen supplied to a cathode input (ca. 25 % of optimal oxidant dose was used).

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Section: Methodsmentioning

confidence: 99%

“…System control and analysis of online signals were performed through the software application developed for LabView environment. Other details of this method were discussed by Slepski et al elsewhere [17].…”

Section: Methodsmentioning

confidence: 99%

Impedance monitoring of fuel cell stacks

Ślepski

Janicka

Darowicki

et al. 2014

J Solid State Electrochem

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“…The measurement of impedance in a galvanostatic manner was performed using the system based on potentiostat/galvanostat Autolab pgstat30 and data acquisition card National Instruments PXI6120 which was described in detail previously [46,47]. Its original configuration involved a two-electrode system, i.e., the current flow which was a multisinusoidal signal was passed throughout the entire system (Fig.…”

Section: Methodsmentioning

confidence: 99%

A complete impedance analysis of electrochemical cells used as energy sources

Ślepski

Darowicki

Janicka

et al. 2012

J Solid State Electrochem

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A comprehensive description of impedance of electrochemical systems has been presented, along with the assumptions of the method used. In this method, a multisinusoidal current excitation signal is used. The changes of potential of both the electrodes and the potential difference between these electrodes are all registered simultaneously as a function of time. The proposed method offers the possibility of separately determining the instantaneous value of impedance of each electrode as well as the impedance of a twoelectrode system. The short-time Fourier transform of time registers allow the determination of changes in the measured impedance values over time. The method has been successfully verified with an electrical equivalent circuit simulating a non-stationary two-electrode system. The values of the impedance of particular components during operation of the fuel cell under a changing load have been obtained.

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“…The measurement's set-up and exact procedure of applying the perturbation signal, amplitude, phase shift, frequencies, resultant signal and further analysis are presented in [31]. For measurement system control, as well as further analysis, LabView applications were used.…”

Section: Methodsmentioning

confidence: 99%

“…The advantage of this technique over FRA is the possibility to analyze non-stationary systems and simultaneously perform impedance measurements and other techniques [29,30]. Detailed information about applying this new method in examination of electrochemical cells has been recently presented by Slepski et al [31].…”

Section: Introductionmentioning

confidence: 99%