Abstract
We demonstrate the feasibility of using Ultra Small Angle X-ray scattering to study cathode structures in solid oxide fuel cells (SOFC) under operating conditions. Cathode thickness has been optimized and symmetric SOFC test structures have been characterized. We also demonstrate that we can follow the evolution of microstructure on a La0.6Sr0.4Co0.2Fe0.8 infiltrated yttria stablized zirconia backbone structure under annealing, showing the viability of characterizing multi-scale cathode structures in real time.