Result And Discussion

Variation of cell exhaust gas composition

Fig.4 shows characteristics of hydrogen concentration deviation at the fuel outlet with three temperature distributions of cooling plate. In easel with uniform temperature distribution of cooling plate, a minimum value of hydrogen concentration appeared near the air inlet area. It suggests that current density is large at the area where is high oxygen concentration. When temperature at the air outlet area of cooling plate is lower than easel, the hydrogen concentration near the air inlet position decrease (case2). On the other hand, when temperature near the air inlet area is lower, the hydrogen concentration near the air inlet position increase (case3). These results suggest that the temperature distribution of cooling plate influences temperature distribution of cell, and it causes variation of current

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