Experimental

The sub-scale single cells (manufactured by Mitsubishi Electric Corporation) with 100cm2 active electrode area were used in this study.

In these experiments, simulated reformed gas (SRG), which consists of 80% H2, 19% C02 and 1% CO, was used for the anode gas. Cathode air is supplied from air compressor with test impurity gases.

The cell temperature is controlled at 185 "C with electric heater. Air utilization and fuel utilization is 50% and 80% respectively.. Flow rates of fuel and air were controlled with mass-flow controllers, and adjusted precisely with a gas chromatography. Generated current was controlled with a DC electric load, and maintained at prescribed current density. Operating conditions are listed in Table 1.

RESULTS AND DISCUSSION (1) INFLUENCE OF IMPURITY GASES

Cathode impurity gases, such as N02, NO, S02, CH4 and C7HS (toluene) were introduced in the air, and influences on cell voltage were examined. These results were summarized in Table 2.

Table 1 SUB-SCALE CELL OPERATING CONDITIONS
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