Protonic ceramic fuel cells and electrolysis cells (PCCs) are drawing attention due to their low activation energy for proton diffusion, fuel flexibility, absence of fuel dilution, and potentially lower housing/stacking cost with the low operating temperature (400 -700 ℃). However, one of the major challenges for PCCs is the development of steam electrode materials and structures that exhibit efficient oxygen reduction reaction and water splitting reaction. The objective of the PhD project is to develop a high performing steam tolerant catalyst (electrode) material, which is currently considered the most critical issue for the technology development of proton conduction solid oxide electrolysis cells (PCECs). The approach will rely on developing nano-structured electrodes using a backbone-based oxygen electrode material functionalized via infiltration with nano-powders made by e.g. hydrothermal synthesis.