Structural characterization of Double-doped Cerium Oxides for Solid Oxide Fuel Cells

Double-doped cerium oxide (CeO₂) is a promising material for catalysis, solid oxide fuel cells, and sensors due to its redox activity and oxygen ion conductivity. This proposal focuses on the electronic and structural properties of CeO₂ doped with Gd and transition metals (Cu, Fe, Mn, Co, Ni), investigated through XAS at the Ce L₃, Gd L₃, and metal K edges. Particular attention is given to the temperature and reduction time dependencies, especially regarding the exsolution of transition metal nanoparticles from the oxide matrix. Probing the Ce L₃ edge will reveal the Ce³⁺/Ce⁴⁺ ratio and oxygen vacancy behavior, while the Gd L₃ edge will clarify dopant environments. Transition metal K-edge studies will uncover oxidation states, coordination environments, and nanoparticle formation mechanisms. This research will enhance our understanding of dopant interactions within the material and reduction conditions, optimizing the material’s performance for energy conversion applications.