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 CO2 conversion. The plasma excitation generates H2O2 in the liquid, which induces the dissolution of Cu into Cu(OH)2 and the recrystallization into Cu2O nanocubes at the interface. The plasma performance of the two excitation schemes is analyzed, showing that the H2O2 production of nanosecond plasma is more efficient than of microsecond plasmas. The nature of the Cu2O nanocubes is evaluated using electron microscopy and electrochemical characterization.
@article{arxiv.2505.08003,
title = {Nanosecond and microsecond-pulsed plasma-in-liquid treated copper oxide surfaces},
author = {P. Pottkämper and N. Unteregge and S. Weller and A. von Keudell},
journal= {arXiv preprint arXiv:2505.08003},
year = {2025}
}