Fuel Cell Handbook (Seventh Edition)

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Fuel Cell Handbook (Seventh Edition) ( fuel-cell-handbook-seventh-edition )

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Figure 6-5 Voltage and Power Output of a 1.0/m2 19 cell MCFC Stack after 960 Hours at 965 °C and 1 atm, Fuel Utilization, 75 percent (50) The remainder of this section will review operating parameters that affect MCFC performance. Supporting data will be presented, as well as equations derived from empirical analysis. 6.2.1 EffectofPressure The dependence of reversible cell potential on pressure is evident from the Nernst equation. For a change in pressure from P1 to P2, the change in reversible potential (∆Vp) is given by RT RT 3/2 ∆Vp= lnP1,a + lnP2,c 2F 2F 3/2 P 2,a P1,c (6-11) where the subscripts a and c refer to the anode and cathode, respectively. In an MCFC with the anode and cathode compartments at the same pressure (i.e., P1=P1,a=P1,c and P2=P2,a=P2,c): RT RT 3/2 RT lnP1 + lnP2 = lnP2 ∆Vp= At 650 °C P2 ⎛ P2⎞ ∆ V p ( m V ) = 2 0 l n = ⎜⎝ 4 6 l o g ⎟⎠ (6-12) ( 6 - 1 3 ) 2F 2F 3/2 4F P2 P1 P1 P1 P1 6-15

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