Michele Del Moro, from the research group ELCAT, presented his work at the 38th Topical Meeting conference in Manchester, UK. Photoelectrochemical devices harnesses solar power to convert carbon dioxide and water into valuable chemicals such as H₂, CO, HCOOH, ethylene and ethanol. The development of novel semiconductors and efficient photoelectrode architectures for that purpose remains critical. Despite years of research, the most studied materials are still Cu₂O-based ones, since it is one of the few native p-type semiconductors that is also known to be active for CO₂ reduction. Among the various activity enhancements strategies found in the literature, nano-structuring Cu₂O with optimal aspect ratio was recently reported to reduce the recombination of charges, therefore resulting in high photocurrents and efficiencies. In this work, we synthesized Cu2O nanowires (NWs) with a length of 2-5 μm and 100-500 nm diameter dfollowing Grätzel et al. The challenges we have encountered during the preparation of these nanowires (e.g. substrate choice, layer thickness, anodization parameter, thermal treatment) will be discussed in order to streamline possible future replication of Cu₂O NWs electrodes. Figure 1b shows that a net photocurrent density as high as 1.6 mA cm^-2 could be obtained during chopped light – linear sweep voltammetry (CL-LSV) measurements. However, since the formation of Cu was observed, the photocurrent was attributed to Cu₂O photoelectrodemical reduction to Cu, rather than to CO₂ reduction. Therefore, an AZO/TiO₂ layer was implemented by atomic layer deposition (ALD) as a protection layer and subsequently covered with Ag as a CO₂ reduction catalyst (Figure 1c). By implementing this protection strategy, the stability of the photoelectrode could be increased. Lastly, the effect of TiO₂ protection layer thickness and Ag loading on photocurrent, stability and CO faradaic efficiency will be discussed.