Göttingen 2025 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 10: Poster Session I

P 10.6: Poster

Dienstag, 1. April 2025, 16:15–18:15, ZHG Foyer 1. OG

Nitrogen fixation and H₂O₂ production by an atmospheric pressure plasma jet — •Jannis Kaufmann, Steffen Schüttler, and Judith Golda — Plasma Interface Physics, Ruhr University Bochum, Bochum, Germany

Atmospheric pressure plasmas are widely used for nitration fixation. Atmospheric pressure plasma jets are suitable sources of reactive species delivered into liquids. The addition of H₂O leads, for example, to the production of H₂O₂ as shown by a capillary plasma jet. Adding nitrogen to the humidified feed gas, nitrogen fixation can be performed by the capillary plasma jet investigated in this work [1]. We used various diagnostics for measuring the concentration of different species in plasma-treated liquid: spectrophotometry (hydrogen peroxide, nitrite), fluorometry (ammonia) and amperometry (hydrogen peroxide). We show that a small admixture of nitrogen (between 0.1 and 1 %) already leads to a lower concentration of hydrogen peroxide. Instead, the plasma produced nitrogen-containing species such as nitride and ammonia. Low frequency pulsing of the RF signal can be used to tune plasma chemistry in our system. Given an additional admixture of oxygen to the system, the hydrogen peroxide production can be increased, while no ammonia is generated. Furthermore the production via hydroxyl radicals was shown to be the main production channel for hydrogen peroxide and nitrite.

This work is supported by the DFG within CRC1316 Project B11

[1] S. Schüttler, J. Kaufmann, J. Golda, Plasma Process. Polym. 2024; 21:e2300233. https://doi.org/10.1002/ppap.202300233

Keywords: nitrogen fixation; hydrogen peroxide production; capillary plasma jet; atmospheric pressure plasma; plasma-treated liquid