Towards the Microstructural Optimization of SOFC Electrodes Using Nano Particle Infiltration
Here we focus on electrodes fabricated with nano-particle infiltration technique, where ceramics structure constructs a framework structure called scaffold, to which nickel particles are introduced in the form of nano particles. 3D microstructural analysis using the focused ion beam scanning electron microscopy (FIB-SEM) (e.g. Figure) revealed that the infiltration technique has a greater potential, compared with the conventional powder mixing and sintering approach, to control the electrode microstructure, which is significantly useful to satisfy the requirements for the electrode microstructure, such as transport properties and electrochemical activities. Numerical simulations for the electrochemical and mechanical analyses are also conducted using the acquired 3D microstructures, delivering a guideline to optimize the electrode microstructure.
Figure. 3D reconstructed microstructure of an SOFC anode prepared using infiltration technique. A ceria scaffold (grey), infiltrated nickel particles (green) and extracted triple-phase boundary lines (red).