Dynamic electrochemical impedance spectroscopy of the first order electrode reaction

Darowicki, Kazimierz; Ślepski, Paweł

doi:10.1016/s0022-0728(03)00154-2

Cited by 96 publications

(55 citation statements)

References 11 publications

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“…3a) and cathodic (Fig. 3b) portions of spectra have regular forms [33][34][35]. In particular, the observed lines are iso-frequency lines that change monotonically with the applied potential.…”

Section: Diagnostic Electrochemical Measurementsmentioning

confidence: 83%

“…DEIS measurements were performed in a manner described earlier [33][34][35]. AC perturbation signal was a package of 20, selected sinusoids of different amplitudes, generated by a DXI 6120 National Instruments measurement card.…”

Section: Diagnostic Electrochemical Measurementsmentioning

confidence: 99%

“…To get better insight into the system's ability to propagate charge, the NiHCF films on glassy carbon were further analyzed using recently proposed and developed approach, DEIS [33][34][35]. In the first step, the perturbation signal (being the sum of selected sine waves of set frequencies, phases shifts, and amplitude) was composed in a manner described earlier [33][34][35] and, subsequently, provided to the potential input of a potentiostat.…”

Section: Diagnostic Electrochemical Measurementsmentioning

confidence: 99%

“…In the first step, the perturbation signal (being the sum of selected sine waves of set frequencies, phases shifts, and amplitude) was composed in a manner described earlier [33][34][35] and, subsequently, provided to the potential input of a potentiostat. Later, a short-time Fourier transform analysis was utilized to obtain the impedance spectra for the electrochemical processes.…”

Section: Diagnostic Electrochemical Measurementsmentioning

confidence: 99%

“…In addition to these important dynamic features, utilization of NiHCF in DSSC is also justified in thermodynamic terms because the system's formal potential is more positive in comparison to that of the I 3 − /I − couple (while being still more negative relative to the potential characteristic of the N3 dye's ground energetic state). In this study, we have diagnosed usefulness of NiHCF using conventional electroanalytical approaches, solid-state voltammetric methodology, as well as dynamic electrochemical impedance spectroscopy (DEIS) technique [33][34][35] that permits monitoring of impedance spectra under potentiodynamic conditions.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical characterization of Prussian blue type nickel hexacyanoferrate redox mediator for potential application as charge relay in dye-sensitized solar cells

Rutkowska

Andrearczyk

Żołądek

et al. 2011

J Solid State Electrochem

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A polynuclear electronically/ionically (redox) conducting mixed-valent inorganic material such as nickel (II) hexacyanoferrate(II,III), NiHCF, was considered for potential application as a redox mediator (charge relay) in dye-sensitized solar cell (DSSC). The NiHCF redox reactions were found fast and reversible not only when the system was studied as thin film exposed to an aqueous supporting electrolyte but also as bulk material (pasted powder) in solid state, i.e., in the absence of contact with external liquid electrolyte phase. Usefulness of NiHCF material was diagnosed using conventional electroanalytical approaches, solid-state voltammetric methodology, as well as the dynamic electrochemical impedance spectroscopy technique that permitted monitoring of impedance spectra under potentiodynamic conditions. The material was utilized in a mixed-valent state, i.e., as a mixture of K 4 Ni II [Fe II (CN) 6 ] and K 3 Ni II [Fe III (CN) 6 ] in which iron(II) and iron(III) sites were at the 1:1 ratio. Under such conditions, dynamics of electron-hopping between mixedvalent iron sites was maximized. Our DSSC utilized cisdithiocyanoatobis(4,4′-dicarboxylic acid-2,2′-bipyridine) ruthenium(II) dye (N3) adsorbed onto TiO 2 semiconductor and NiHCF as redox mediator. Although performance of our DSSC was not optimized in terms of the NiHCF film thickness and morphology, as well as lower photocurrents in comparison to those characteristic of the iodine/iodide based DSSC were obtained, our system yielded readily fairly high open-circuit photovoltages on the level of 800 mV. An important issue was that the formal potential of NiHCF was more positive relative to the potential of the iodide/triiodide couple while being still more negative than that equivalent to the ground state of the N3 dye. Thus, NiHCF mediator was able to regenerate the dye.

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Section: Diagnostic Electrochemical Measurementsmentioning

confidence: 83%

Section: Diagnostic Electrochemical Measurementsmentioning

confidence: 99%