Abstract
The development of a tailored microstructure is considered essential for the development of anode‐supported intermediate temperature‐solid oxide fuel cells (IT‐SOFCs) as it is expected to enhance kinetics at the triple phase boundary. In this study, the application of an in situ foaming technique for the preparation of Ni‐yttria‐stabilized zirconia (YSZ) cellular solids as an anode support for IT‐SOFCs is presented. The cermet microstructure is dependent on the preparative route followed. The presence of contaminants in the commercial template precursor was found to be detrimental for electrical properties. A high‐purity polyurethane was then formulated, and tailored Ni–YSZ foams were obtained with 87% porosity. The foam microstructure is characterized by a hierarchical architecture, with interconnected networks of Ni and YSZ particles, large pores related to the open cell structure, and a submicron porosity of the structural trabecular network, with a conductivity value of 80 S/cm at 700°C.
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