B-Site Dopant Effects on Structural Transformations and Nanoparticle Exsolution in La0.3Sr1.7Fe1.5Mo0.5O6

The European Green Deal drives the need for durable, efficient energy technologies. Solid Oxide Cells (SOCs) are promising but require electrode materials stable in hydrogen-rich environments. The double perovskite Sr₂Fe₁.₅Mo₀.₅O₆−δ shows high conductivity but degrades under hydrogen. Building on prior work showing that La substitution improves stability and transition-metal doping enables nanoparticle exsolution, this project studies La₀.₃Sr₁.₇Fe₁.₅−3/4xMo₀.₅−1/4xMₓO₆ (M = Co, Ni, Cu). Early results indicate Co and Ni enhance exsolution but reduce stability, while Cu suppresses degradation and forms unique surface structures. Advanced spectroscopy will reveal the mechanisms, guiding the design of robust SOC electrodes.