Erlangen 2026 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 16: Poster Session Plasma Physics
P 16.42: Poster
Donnerstag, 19. März 2026, 13:45–15:45, Redoutensaal
In-vacuo DBD-XPS surface study of Au and Ag electrodes exposed to N2/H2 plasmas — •A.A. Ben Yaala1, R. Antunes1, T. Höschen1, A. Manhard1, A. Hecimovic1, and U. Fantz1,2 — 1Max-Planck-Institut für Plasmaphysik, Boltzmannstraße 2, 85748 Garching, Germany — 2University of Augsburg, 86149 Augsburg, Germany
Dielectric barrier discharge (DBD) reactors are one of the most commonly studied discharges for plasma-assisted ammonia (NH3) synthesis due to their simplicity, low gas temperatures, and compatibility with catalytic materials. However, the limited access to the catalyst’s
surface in conventional DBD designs hinders a detailed fundamental understanding of the plasma-surface chemistry responsible for NH3 formation.
In this work, an in-vacuo planar DBD-XPS (X-Ray Photoelectron Spectroscopy) setup developed to investigate the chemistry of electrode surfaces exposed to N2/H2 plasmas is introduced. The use of noble surfaces such as gold (Au) and silver (Ag) prevents formation of metallic nitrides and enables studying the effect of adsorbed NHx species.
This contribution compares the concentrations of the adsorbates resulting from various plasma conditions with the ammonia synthesis rates determined with mass spectrometry.
Keywords: Plasma; Surface; XPS; DBD; Ammonia