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1.1 1 0.9 0.8 0.7 0.6 2002 (95oC, 4 atm., immobilized) 2001 (75oC, 1 atm.) 1984 (65oC, 1 atm.) 1978 (110oC, 10 atm.) 1969 (220oC, 4 atm.) 2001 (75oC, 1 atm.) 0 100 200 300 400 500 600 700 Current Density (mA/cm2) Figure 4-3 Evolutionary Changes in the Performance of AFCs (8, 12, & 16) The data described in the following paragraphs pertains to the H2/air cell. Unfortunately, H2/air performance data is rather dated; there has been a noticeable lack of recent H2/air data. 4.2.1 EffectofPressure AFCs experience the typical enhanced performance with an increase in cell operating pressure. Figure 4-4 plots the increase in reversible e.m.f. (electromotive force) of alkaline cells with pressure over a wide range of temperatures (17). The actual increase in cell open circuit voltage is somewhat less than shown because of the greater gas solubility with increasing pressure that produces higher parasitic current. At an operating temperature (T), the change in voltage (∆VP) as a function of pressure (P) can be expressed fairly accurately using the expression: ∆VP (mV) = 0.15T (°K) log(P2/P1) (4-4) over the entire range of pressures and temperatures shown in Fig. 4-4. In this expression, P2 is the desired performance pressure and P1 is the reference pressure at which performance is known. 4-8 Cell Voltage (V)PDF Image | Fuel Cell Handbook (Seventh Edition)
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