Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : July 26, 2021 - July 27, 2021
In porous anodes of solid oxide fuel cells (SOFCs) fabricated by adding a pore former, correlation between bimodal pore structure and its permeability is investigated. The pore structures of the anodes were analyzed in 3D using the focused ion beam and scanning electron microscopy (FIB-SEM). The quantified microstructural parameters indicate that increasing the amount and size of the pore former increases the porosity and mean pore size, reducing the complexity of the pore structure. From the analysis of the pore-size distribution, the pore structure in the porous anodes consists of two types of structures; one is formed at sintering and reduction and has fine pores around 1 μm (Pore_REF), and the other is formed by the pore former and has relatively large pores around 2-5 μm (Pore_PF). Permeability of the porous anode is evaluated in experiment on the basis of the Darcy’s law. The results indicate that decreasing the complexity of the pore structure increases the permeability. From the correlation between the pore-size distribution and the permeability, it is found that the permeation flow rate is limited by the structure with Pore_REF when the main flow paths formed by Pore_PF are connected only by Pore_REF.
