Calculation of the impedance of noncylindrical pores Part II: Experimental verification on pores drilled into stainless steel

Eloot, Katrien; Debuyck, F.; Moors, M.; Peteghem, A.P. Van

doi:10.1007/bf00249651

Cited by 36 publications

(11 citation statements)

References 6 publications

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“…In the case of bispherical pores, the effects of each sphere can be observed at different frequencies; at high frequencies, the ac signal penetrates only to the first sphere, and at lower frequencies it penetrates up to the second (deeper) sphere displaying two overlapping semicircles. Impedance of other arbitrary noncylindrical pores was also simulated using division into small cylinders and matrix calculations [417,418].…”

Section: Other Pore Geometry With Ohmic Drop In Solution Onlymentioning

confidence: 99%

Electrochemical Impedance Spectroscopy and its Applications

Lasia¹

2014

683

504

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Section: Other Pore Geometry With Ohmic Drop In Solution Onlymentioning

confidence: 99%

Electrochemical Impedance Spectroscopy and its Applications

Lasia¹

2014

683

504

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“…Usually the charging/discharging process of porous electrode is a ected by the distribution of pore sizes, length, shape, and roughness of the surface. Also, by adopting the TL model, various modifications, including charge transfer reactions, resistance of electrode material, potential, and concentration gradient inside pore and morphological features, namely, pore shapes, − length, sizes, and distributions, , pore with fractal structures (in micro-, meso-, and macropore), − bimodal pores, and for hierarchical nanostructures are developed. However, the application of TL model and its variants to understand the impedance spectra of hierarchical porous electrode still remains unclear as there is no clear relation of ion transport in micro-, meso-, and macroscales.…”

Section: Introductionmentioning

confidence: 99%

Theory of the Electrochemical Impedance of Mesostructured Electrodes Embedded with Heterogeneous Micropores

Kant

Singh

2017

J. Phys. Chem. C

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We develop a phenomenological theory of electric double layer (EDL) dynamics at complex bimodal electrode morphology, viz. arbitrary shaped mesostructures with embedded heterogeneous micropores. The dynamics of the diffuse layer at mesoscale is described through the Debye-Falkenhagen (DF) model of EDL relaxation and dynamics at micropores is described by employing the de Levie’s transmission line (TL) model. The influence of mesostructure on the diffuse layer dynamics is incorporated elegantly, employing a Green’s function (obtained through multiple scattering formalism) expressing the local admittance of arbitrary shaped mesostructure in surface mean and Gaussian curvatures of electrode. The model also incorporates the finiteness of the molecular Stern layer through correction in surface curvatures and generalizes the EDL response for arbitrary shaped mesostructured electrodes. The contribution of morphological parameters, namely, micropore depth, mesostructure size, bimodal (micro- and meso-) structure combination, and surface heterogeneity to impedance spectrum is discussed. In particular, at low frequencies the surface heterogeneity causes distribution of relaxation times resulting in constant phase element (CPE) behavior. At intermediate frequencies, a significant influence of micropore length is found to cause a slow rate of charge storage, which competes with the mesostructured geometry, shape, and size causing the faster high frequency diffuse layer dynamics. In general, the bimodal convex mesostructure has a faster EDL reorganization than the concave mesostructure. We conclude from the study that mesostructured morphology coupled with heterogeneous microporous geometry can effectively increase or decrease the charging dynamics of porous electrodes.

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“…The electrochemical porosimetry detects the microstructure that a used electrolyte actually probes, covering pore radii of several Å to at least several tenth of cm [13]. The electrochemical porosimetry detects the microstructure that a used electrolyte actually probes, covering pore radii of several Å to at least several tenth of cm [13].…”

Section: Discussionmentioning

confidence: 99%

Electrochemical Porosimetry

Song

Lee

2001

MRS Proc.

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We have developed the electrochemical porosimetry analyzing microstructures of porous electrodes, which can give geometric information most meaningful in electrochemical systems. The methodology is based on the transmission line model with pore size distribution (TLM-PSD) that relates electrochemical impedance data with microstructural information. Pore length (l p ), as well as pore size distribution, can be obtained by fitting the TLM-PSD to the experimental impedance data of a porous electrode. This geometric information was validated for the microporous, mesoporous and macroporous samples by comparing with the data obtained from conventional porosimetry. It was also shown that the electrochemical porosimetry could be used as a nondestructive probe to investigate the construction of electrochemical devices.

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Calculation of the impedance of noncylindrical pores Part II: Experimental verification on pores drilled into stainless steel

Cited by 36 publications

References 6 publications

Electrochemical Impedance Spectroscopy and its Applications

Electrochemical Impedance Spectroscopy and its Applications

Theory of the Electrochemical Impedance of Mesostructured Electrodes Embedded with Heterogeneous Micropores

Electrochemical Porosimetry

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