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Figure 5-5 Polarization at Cathode (0.52 mg Pt/cm2) as a Function of O2 Utilization, which is Increased by Decreasing the Flow Rate of the Oxidant at Atmospheric Pressure 100 percent H3PO4, 191°C, 300 mA/cm2, 1 atm. (38) ∆ VCathode (mV)=148log(P02 )2 0.04≤ P02 ≤0.20 PTotal (5-8) (P02 )1 ∆ VCathode (mV) = 96 log (P02 )2 0.20 < (P02 )1 P02 PTotal < 1.00 where Ρ O2 is the average partial pressure of O2. The use of two equations over the concentration (5-9) range more accurately correlates actual fuel cell operation. Equation (5-8) will generally apply to fuel cells using air as the oxidant and Equation (5-9) for fuel cells using an O2-enriched oxidant. Fuel: Hydrogen for PAFC power plants will typically be produced from conversion of a wide variety of primary fuels such as CH4 (e.g., natural gas), petroleum products (e.g., naphtha), coal liquids (e.g., CH3OH), or coal gases. Besides H2, CO and CO2 are also produced during conversion of these fuels (unreacted hydrocarbons are also present). These reformed fuels contain low levels of CO (after steam reforming and shift conversion reactions in the fuel processor) that cause anode CO absorption in PAFCs. The CO2 and unreacted hydrocarbons (e.g., CH4) are electrochemically inert and act as diluents. Because the anode reaction is nearly reversible, the fuel composition and hydrogen utilization generally do not strongly influence cell performance. The voltage change due to a change in the partial pressure of hydrogen (which can result from a change in either the fuel composition or utilization) can be described by Equation (5-10) (16, 36, 37): 5-15PDF Image | Fuel Cell Handbook (Seventh Edition)
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