Representative volume element size for accurate solid oxide fuel cell cathode reconstructions from focused ion beam tomography data

Our corrected reconstruction data set represents a volume of ∼2800 μm3 and contains ∼96 × 106 voxels. This data set is then used for calculating: (i) volume-specific surface area of the LSCF cathode, (ii) volume/porosity fraction, and (iii) tortuosity of LSCF and pores at a constant base area, but for an increasing height of the reconstructed electrode. Moreover, the course of these microstructure parameters is calculated independently for three representative volume elements.