Dresden 2026 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 19: Poster Session

MM 19.18: Poster

Dienstag, 10. März 2026, 18:00–20:00, P5

Experimental Determination of Site Energy Spectrum of Hydrogen in Metal Thin Films — •Magdalena Seiler, Stefan Wagner, and Astrid Pundt — Karlsruhe Institute of Technology (KIT), Institute of Applied Materials (IAM-WK), Engelbert- Arnold-Straße 4, 76131 Karlsruhe, Germany

Metal-hydrogen interactions affect the mechanical properties of structural materials and the performance of solid-state hydrogen storage. Hydrogen occupies the metal lattices interstitial sites or different defects, whose site energy distribution characterizes the metal-hydrogen interaction. The site energy can be affected by the stress state, as suggested by theoretical calculations [1]. In this presentation, the constraints of a thin film adhered to a rigid substrate serve as a model 2D stress state. We experimentally determine the chemical potential of hydrogen in respective metal thin films during electrochemical hydrogen loading, and simultaneously measure the stress resulting in the hydrogen-absorbing, 1D expanding thin film. The result is compared to a Distribution of Site Energies (DOSE) model [2], in which Fermi-Dirac statistics are used to describe the hydrogen occupancy of the density of sites. Thereby, we obtain a site energy spectrum and quantify defect fractions.

[1] A. Dyck, T. Böhlke, A. Pundt, S. Wagner, Scripta Materialia 247 (2024) 116117.

[2] S. Wagner, A. Pundt, AIMS Materials Science 7 (2020) 399-419.

Keywords: Thin film; Electrochemical hydrogen loading; Metal-hydrogen interaction