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Figure 7-17 Cell Performance at 1,000 °C with Pure Oxygen (o) and Air (∆) Both at 25 percent Utilization (Fuel (67 percent H2/22 percent CO/11 percent H2O) Utilization is 85 percent) Based on the Nernst equation, the theoretical voltage gain due to a change in oxidant utilization at T = 1,000 °C is ∆ VCathode = 63 log (PO2 )2 (7-14) (PO2 )1 where PO2 is the average partial pressure of O2 in the system. Data (43) suggest that a more accurate correlation of voltage gain is described by ∆ VCathode = 92 log (PO2 )2 (7-15) (PO2 )1 Fuel: The influence of fuel gas composition on the theoretical open circuit potential of SOFCs is illustrated in Figure 7-18, following the discussion by Sverdrup, et al. (39). The oxygen/carbon (O/C) atom ratio and hydrogen/carbon (H/C) atom ratio, which define the fuel composition, are plotted as a function of the theoretical open circuit potential at 1,000 °C. If hydrogen is absent from the fuel gas, H/C = 0. For pure CO, O/C = 1; for pure CO2, O/C = 2. The data in the figure show that the theoretical potential decreases from about 1 V to about 0.6 V as the amount of O2 increases and the fuel gas composition changes from CO to CO2. The presence of hydrogen in the fuel produces two results: (1) the potential is higher, and (2) the O/C ratio corresponding to complete oxidation extends to higher values. These effects occur 7-26PDF Image | Fuel Cell Handbook (Seventh Edition)
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