Nanosecond and microsecond-pulsed plasma-in-liquid treated copper oxide surfaces

P. Pottkämper; N. Unteregge; S. Weller; A. von Keudell

paper

Nanosecond and microsecond-pulsed plasma-in-liquid treated copper oxide surfaces

arXiv:2505.08003

Abstract

Nanosecond and microsecond plasma-in liquid systems are explored to oxidize or regenerate a copper oxide surface in situ to serve as a catalyst for electrochemical CO $_{2}$ conversion. The plasma excitation generates H $_{2}$ O $_{2}$ in the liquid, which induces the dissolution of Cu into Cu(OH) $_{2}$ and the recrystallization into Cu $_{2}$ O nanocubes at the interface. The plasma performance of the two excitation schemes is analyzed, showing that the H $_{2}$ O $_{2}$ production of nanosecond plasma is more efficient than of microsecond plasmas. The nature of the Cu $_{2}$ O nanocubes is evaluated using electron microscopy and electrochemical characterization.