600

■ Output voltage □ Anode polarization llllilllliill

■ Output voltage □ Anode polarization

□ Cathode polarization

□ Cathode polarization

I 2 3 4 5 e 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

Cell number

Fig. 2 Analyzed result of each cell performance.

said cell voltage is controlled by parameter A relating to diffusion of super oxide in the electrolyte under this condition. Diffusion of super oxide plays an important roll in the cathode polarization. At lower C02 partial pressure, effect of parameter B relating to C02 diffusion would be larger. The result suggested that thickness of electrolyte film on the cathode of low performance cell is thicker than of high performance cell or that actual effective cell area for cathode reaction of low performance cell is smaller than of high performance cell.

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