Publication date: 15th December 2025
In this study, the microstructure of carbon-wrapped core–shell Cu@Cu₂O nanowires was investigated for potential applications in CO₂ reduction. The morphology, structure, and composition were characterized by scanning and transmission electron microscopy (S/TEM), complemented by electron diffraction and chemical mapping. The system was further analyzed at identical locations before and after an electrochemical stability experiment to identify morphological and structural changes occurring during cycling. It was found that when the carbon coating breaks, the material undergoes accelerated degradation, leading to nanowire modification and reduced material stability. In a second study, the microstructure of Cu dendrites formed during pulsed operation under a specific electrochemical protocol [1] was examined to identify the most common surface planes present in the exposed fractal morphology. The dendrites consist of multiple grains with some exhibiting planar defects. High-index facets were observed at the surface, followed by the growth of a Cu₂O layer. These findings provide insight into how nanostructural modifications influence catalyst performance, which is critical for improving CO₂ reduction processes.
Authors would like to thank the European Research Council (ERC) Starting Grant 123STABLE (Grant agreement ID: 852208) and the funding for Marie Skłodowska-Curie Actions, Individual Fellowships Project CO2-CAT-ALOG (grant reference no. 897866) the EU commission for Horizon 2020 Framework Program.
