Van Marum Colloquium: Impedance analysis of electrochemical system: recent advances on the study of capacitive systems
- Monday 12 June 2023
2333 CC Leiden
Electrochemical impedance spectroscopy has become a routine technique to study many systems such as energy storage systems, corrosion... However, despite its simplicity of implementation, the analysis of the results often remains very superficial. Our group has been working a lot in the last few years on the development of analytical methods for impedance spectroscopy based on various experimental examples. In this presentation, we will show that the different electrochemical techniques (cyclic voltammetry, chronoamperometry, impedance spectroscopy etc.) contain the same information that is more or less easy to extract depending on the systems studied. In a second part, a particular attention will be paid to the analysis of capacitive systems in general and supercapacitors in particular.[3, 4] Finally, we will focus on an original impedance technique, the double modulation of the interfacial capacitance, which allows to probe the reorganization of ions at the metal/solution interface.
- M. Sluytersrehbach, Impedances of Electrochemical Systems - Terminology, Nomenclature and Representation .1. Cells with Metal-Electrodes and Liquid Solutions (Iupac Recommendations 1994), Pure and Applied Chemistry, 66 (1994) 1831-1891.
- V. Vivier, M.E. Orazem, Impedance Analysis of Electrochemical Systems, Chem Rev, 122 (2022) 11131-11168.
- A. Allagui, T.J. Freeborn, A.S. Elwakil, B.J. Maundy, Reevaluation of Performance of Electric Double-layer Capacitors from Constant-current Charge/Discharge and Cyclic Voltammetry, Sci Rep, 6 (2016) 38568.
- S.M. Gateman, O. Gharbi, H. Gomes de Melo, K. Ngo, M. Turmine, V. Vivier, On the use of a constant phase element (CPE) in electrochemistry, Current Opinion in Electrochemistry, 36 (2022).