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P: Fachverband Plasmaphysik

P 3: Plasma Wall Interaction I

P 3.4: Vortrag

Montag, 26. Februar 2024, 15:00–15:15, ELP 6: HS 3

Laser enhanced copper surface oxide generation by plasma generated reactive oxygen species — •Sascha Chur¹, Robin Minke¹, Marc Böke², and Judith Golda¹ — ¹Plasma Interface Physics, Ruhr-University Bochum, D-44801 Bochum, Germany — ²Experimentalphysik II, Ruhr-University Bochum, D-44801 Bochum, Germany

Copper, a promising catalyst for CO₂ electroreduction, faces challenges of poor selectivity and energy efficiency. Copper oxides enhance selectivity, particularly towards C₂₊ products. Surface morphology significantly influences performance, and our study demonstrates that combined laser and plasma treatment fine-tunes these characteristics for effective functionalization. Treatment with a micro atmospheric pressure plasma jet induces Cu(II) oxides on copper by generating reactive oxygen species. Investigation into prevalent reaction partners produced by the plasma jet revealed atomic oxygen density at 10²¹ m⁻³ (two-photon absorption laser-induced fluorescence). Singlet delta oxygen, at 10²⁰ m⁻³ (emission spectroscopy) closely aligned with simulation results, while ozone density, calculated at 10²¹ m⁻³ (absorption spectroscopy), was overestimated by the simulation. X-ray Photoelectron Spectroscopy of treated surfaces demonstrated an increasing Cu(II) oxide ratio with extended treatment. This research provides insights into controlled and precise copper surface modification, applicable in diverse fields requiring tailored material properties. Supported by the DFG within CRC 1316, project B2.

Keywords: Plasma surface interaction; Laser surface interaction; Atmospheric pressure plasma; Copper catalyst