Electrochemical impedance spectroscopic investigations of porous and gas diffusion electrodes for various applications

Kurzfassung

Electrochemical impedance spectroscopy (EIS) is a powerful tool for investigating electrochemical systems. Based on De Levie's pore model, several new models (impedance models) and approaches to describe porous electrodes are presented. These highly structured electrodes, thanks to their high electrochemical active surface area, are mostly used in electrochemical systems for energy generation and storage. The following electrochemical applications are presented as examples of EIS investigation of gas diffusion electrodes (GDE): oxygen reduction in the Zn-air battery and oxygen depolarizing cathode (ODC) in the chlorine alkali electrolysis, Lithium-Sulfur battery and CO2-reduction.