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Figure 4-8 iR-Free Electrode Performance with O2 and Air in 9 N KOH at 55 to 60°C. Catalyzed (0.5 mg Pt/cm2 Cathode, 0.5 mg Pt-Rh/cm2 Anode) Carbon-based Porous Electrodes (22) The results in Figure 4-8 yield the following current density equations for cells operating in 9N KOH at 55 to 60 °C: or ∆VJ (mV) = -0.18∆J for J = 40 to 100 mA/cm2 operating in O2 (4-8) ∆VJ (mV) = -0.31∆J for J = 40 to 100 mA/cm2 operating in air (4-9) where J is in mA/cm2. The performance of a single cell with supported noble metal electro- catalyst (0.5 mg Pt-Rh/cm2 anode, 0.5 mg Pt/cm2 cathode) in 12N KOH at 65 oC is shown in Figure 4-9 (21). These results, reported in 1986, are comparable to those obtained in 1965. The iR-free electrode potentials (vs. RHE) at 100 mA/cm2 in Figure 4-9 are 0.9 V with O2 and 0.85 V with air. One major difference between the early cathodes and the cathodes in current use is that the limiting current for O2 reduction from air has been improved (i.e., 100 to 200 mA/cm2 improved to >250 mA/cm2). These results yield the following equations for cells operating in 12N KOH at 65 oC: or ∆VJ (mV) = -0.25∆J for J = 50 to 200 mA/cm2 operating in O2 ∆VJ (mV) = -0.47∆J for J = 50 to 200 mA/cm2 operating in air. (4-10) (4-11) 4-13PDF Image | Fuel Cell Handbook (Seventh Edition)
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