Micro tubular SOFCs under 1 mm diam. have been successfully fabricated using doped ceria electrolyte and Ni cermet as an anode tubular electrode. The performance has been evaluated at an operating temperature of 600 deg C. In this study, effect of processing parameters on the structure of the micro tubular cell, and the effect of tube length on the performance of the cell was investigated. The results showed that determination of the length of single tubular cell was crucial especially when tube length became more than 1 cm due to an increase of the anode tube resistance as a current collector. New cube-type stack design was also proposed using the micro tubular SOFC bundles prepared from cathode porous matrices.
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