DFRTtoEIS: An easy approach to verify the consistency of a DFRT generated from an impedance spectrum. (10th January 2021)

• Record Type: Journal Article
• Authors: Melo, B.M.G.; Loureiro, Francisco J.A.; Fagg, Duncan P.; Costa, L.C.; Graça, M.P.F.
• Is Part Of: Electrochimica acta. Volume 366(2021)
• Publication Date: 2021-01-10
• Subjects: Electrochemical impedance spectroscopy -- Dielectric relaxation -- Equivalent circuits -- Distribution function of relaxation times -- DFRT; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2020.137429
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: Reconstruction of an impedance spectrum from the generated DFRT. An easy approach to check the consistency of a DFRT in several representations. Reconstruction of Z*/M* data of each electrochemical process or multiple processes. Calculation of the resistance, capacitance and time constant of each relaxation. Extrapolation of the impedance data beyond the experimental range. Abstract: Electrochemical Impedance Spectroscopy (EIS) is a leading tool for the characterization of electrochemical processes in a wide class of materials. The combined analysis of EIS with the estimation of Distribution Function of Relaxation Times (DFRT) can help to differentiate overlapped polarizations in the frequency domain and to provide a greater understanding of a suitable electrical circuit to model the impedance data. To ensure that the calculated DFRT agrees with the experimental impedance, a practical procedure is to reconstruct the impedance from the DFRT. In this work, we present a user-friendly, free to use, graphical interface that allows the transformation of DFRT data into a synthetic impedance spectrum that can be compared with the original experimental data. Besides the validation test of the DFRT, our solution allows the adjustment of the DFRT peaks to automatically estimate the resistance, time constants and capacitances of each response. Graphical abstract: Image, graphical abstract