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Figure 4-9 iR Free Electrode Performance with O2 and Air in 12N KOH at 65 °C. Catalyzed (0.5 mg Pt/cm2 Cathode, 0.5 mg Pt-Rh/cm2 Anode), Carbon-based Porous Electrodes (21). 4.2.5 EffectsofCellLife The UTC Fuel Cells H2/O2 alkaline technology exhibits a degradation of ~25 mV/1,000 hours (13). AFC cell stacks have demonstrated sufficiently stable operation for at least 5,000 hours, with degradation rates of 20 mV per 1,000 hours or less (24). Siemens reported a total of >8,000 operating hours with approximately 20 units (27). For large scale utility applications, economics demand operating times exceeding 40,000 hours, which presents perhaps the most significant obstacle to commercialization of AFC devices for stationary electric power generation. 4.3 Summary of Equations for AFC The preceding sections described parametric performance based on various referenced data at different cell conditions. The following set of equations can be used to predict performance only if no better data or basis for estimate is available. Unfortunately, a noticeable lack of recent, published H2/air data is available to predict performance trends. The equations presented below can be used in conjunction with the measured H2/air performance shown in Figure 4-10 (12) as a basis for predicting performance at various operating conditions. The Space Shuttle Orbiter performance is included in Figure 4-10 as a reference point for H2/O2 performance (8); however, the trend equations should not be used for H2/O2 cells to predict operation at other conditions. 4-14PDF Image | Fuel Cell Handbook (Seventh Edition)
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