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We investigated an appropriate preparation condition for anode‐supported SOFCs: (La,Sr)MnO3/cathode functional layer/YSZ/Ni‐YSZ were fabricated with and without a Ni‐YSZ anode functional layer (AFL) via the tape‐casting method, where the AFL thicknesses were controlled from approximately 20 to 80 μm. The warpage depended on the co‐sintering temperature of the electrolyte/AFL/anode‐support half‐cells, indicating that similar shrinkage of the electrolyte/AFL/anode support is significant for lower warpages. The electrical properties of SOFCs with AFLs were compared to those of SOFCs without AFLs. In this regard, the use of an AFL decreased the ohmic and activation polarization resistances due to both the decrease in contact resistance between the electrolyte and the AFL and the increase in three‐phase boundaries. However, the polarization diffusion increased when an AFL was employed, because AFL layers are denser than the anode support. The maximum power densities of samples with AFL were higher than those of SOFCs without AFLs, indicating that the decrease in both ohmic and activation‐polarization resistances is more significant for improving the power densities, as compared to the concentration polarization resistance.

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The Solid Oxide Fuel Cell (SOFC) power generation system has much advantage in efficiency, which reaches over 6 0 % , and is environmental benign. The SOFC is expected to be a new fossil fueled electricity generation system in near future, when environmental regulation becomes severer. For the practical use, SOFC is suitable for both large-scale utility power generation system and on-site cogeneration system. Mitsubishi Heavy Industries, Ltd. (MHI) has been developing SOFC technology for 8 years. MHI's R & D efforts have been pointed to many phases of SOFC development:fundamental study, improvement of a single cell-stack, modularizing technology and feasibility study of practical system. MHI has been trying to develop two types of SOFC, which are tubular type and planar type. In this paper, MHI introduces its activities and results on the tubular type SOFC and feasibility study.