Abstract
Hollow polymer spheres were successfully introduced to form porous electrode layers for SOFC unit cell fabrication. In the presence of extreme differences in size and density between pore precursor and ceramic particles, hindered settling and bimodal packing behavior were actively utilized in order to produce homogeneous green tapes. There were two prominent transitions. The one was close-to-open pore transition near 40~50 vol% pore precursor addition while the other was formation of continuous network by pore precursor particles at 60~70 vol% addition. By properly manipulating pore precursor/ceramic powder ratio and by carefully preparing slurry, bi- and tri-layer composite cells were successfully fabricated without evident defects using tape casting/lamination/co-firing techniques.
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