Distribution of Relaxation Times: Debye Length Distribution vs Electrode Polarization by a Cole−Cole Relaxation Model. Issue 1 (27th January 2022)

• Record Type: Journal Article
• Authors: Compañ, Vicente; Diaz-Calleja, Ricardo; Diaz-Boils, Joaquín; Escorihuela, Jorge
• Is Part Of: Journal of the Electrochemical Society. Volume 169:Issue 1(2022)
• Publication Date: 2022-01-27
• Subjects: Membranes and Separators -- Fuel Cells - PEM -- Mixed Ionic Electronic Conductors -- Physical properties of electronic materials -- Solid-State Ionics -- Electrochemical Engineering; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/1945-7111/ac4bf9
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : Mobility, diffusivity and charge density in polyelectrolytes, are generally determined from electrochemical impedance spectroscopy following the electrode polarization analysis, in which at a given temperature the peaks in tan δ are fitted based on a model. These results can be different depending on the model used in the fitting of the curves. Generally, the models are based on a single Debye model or on the existence of an overlap in relaxation times (Cole–Cole model). In this work, we propose the alternative use of the distribution of the relaxation times by a distribution of the Debye length (LD ), which allows the calculation of parameters such as mobility, diffusivity, and charge density as a function of LD in a more concise approach.