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Table 5-2 Advanced PAFC Performance Average Cell Voltage, V mA/cm2 Current Density Power Density W/cm2 IFC Pressurized: Project Goal Single Cells Full Size Short Stack 11 MW Reference 0.75 to 0.66 0.71 0.75 431 to 645 431 190 0.188 0.323 0.307 0.142 IFC Atmospheric: Single Cells Full Size Short Stack 0.75 0.65 242 215 0.182 0.139 Mitsubishi Electric Atmospheric Single Cells 0.65 300 0.195 Figure 5-3 Advanced Water-Cooled PAFC Performance (16) The atmospheric pressure short stack, consisting of 32 cells, obtained an initial performance of 0.65 volts/cell at 200 A/ft2 (215 mA/cm2) or 0.139 W/cm2. The performance degradation rate was less than 4 mV/1,000 hours during the 4,500 hour test. Single cells, tested at atmospheric conditions, achieved a 500 hour performance of approximately 0.75 volts/cell at 225 A/ft2 (242 mA/cm2) or 0.182 W/cm2. Mitsubishi Electric Corporation investigated alloyed catalysts, processes to produce thinner electrolytes, and increased utilization of the catalyst layer (20). These improvements resulted in an initial atmospheric performance of 0.65 mV at 300 mA/cm2 or 0.195 W/cm2, which was higher than the UTC Fuel Cells' performance mentioned above (presented in Table 5-2 for comparison). Note that this performance was obtained using small 100 cm2 cells and may not yet have been 5-8PDF Image | Fuel Cell Handbook (Seventh Edition)
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