Abstract
A Solid Oxide Fuel Cell (SOFC) with flat-tubular structure was successfully fabricated by ceramic wet processing. The SOFCs had 3 channels or 4 channels for fuel gas flow inside and were supported by the fuel-electrode. The SOFCs were composed of 8 mol Y2O3-ZrO2 (YSZ) electrolyte, Ni-YSZ fuel-electrode and La0.8 Sr0.2 MnO3 air-electrode. The SOFCs had a feature that fuel gas was homogeneously supplied to fuel-electrodes with fuel gas pipes made of heat-resistant alloy. The SOFC of 50 cm2 active area was operated to achieve maximum power density of 0.23 W/cm2 at1000°C. The effect of the fuel gas pipe on the cell performance was recognized, because the performance was two times as high as that of SOFC without the fuel gas pipe. The performance of the SOFC with 4 channels for fuel gas was slightly higher than that with 3 channels. It also appeared that the performance of SOFC with 3 channels was decreased rapidly with increasing fuel utilization.
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