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MM: Fachverband Metall- und Materialphysik

MM 9: Poster

MM 9.17: Poster

Montag, 17. März 2025, 18:30–20:30, P1

Electrochemical determination of the diffusion coefficient of intercalating species in host metals - conditions of applicability of potential step chronoamperometry — •Magdalena Seiler, Giorgia Guardi, Stefan Wagner, and Astrid Pundt — KIT, Karlsruhe, Deutschland

The diffusion coefficient is generally used to describe the diffusion of intercalating species such as lithium and hydrogen in host metals. It can be determined by a variety of methods, including electrochemical methods. Among these, permeation methods between front and back side of a sample are widely used. On the contrary, in potential step chronoamperometry only one side of the sample needs to be contacted, which is e.g. beneficial for thin film studies. In this work measurements using both methods are performed for hydrogen in palladium and compared to the literature. It is shown that the application of the potential step chronoamperometry approach gives correct results only under very specific restrictions regarding sample thickness and measurement period.

Keywords: Diffusion of intercalating species; Electrochemical Hydrogenation; Electrochemical Kinetics; Potential Step Chronoamperometry