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Figure 7-23 Representative State-of-the-Art Button Cell Performance of Anode-Supported SOFC (1) To reduce resistivity of the electrolyte, development has focused on reducing its thickness from 150 μm to about 10 μm. Wang, et al. (71), at the University of Pennsylvania, fabricated thin- film YSZ electrolytes between 3 and 10 μm. Wang reported significant improvement in cell performance with mixed conducting-doped YSZ electrodes; Tb- and Ti-doped YSZs increased power densities between 15 to 20 percent. Other examples of this approach are also available in the literature (72, 73,74 ,75 ,76). Ball and Stevens (74) report that gadolinium-doped ceria is a good candidate for use as an alternative electrolyte when compared to zirconia, due to its higher conductivity at lower temperatures. However, doped ceria has a number of disadvantages, such as electronic conductivity and reduced strength. Results indicate that an increase in strength can be produced in the ceria by addition of zirconia particles that is dependent on the particle size and heat treatment. Research at the University of Texas at Austin (72) sought to develop electrolytes that have higher conductivity than YSZ. Goodenough and Huang (77) identified a system of LaSrGaMgO (LSGM) as a superior oxide-ion electrolyte with performance at 800 °C comparable to YSZ at 1,000 °C. LSGM lacks the toughness of YSZ, which makes it more difficult to fabricate as an ultra-thin film, but its superior ionic conductivity allows thicker films to be used. Figure 7-24 illustrates the performance of a single cell based on LSGM electrolyte. 7-37PDF Image | Fuel Cell Handbook (Seventh Edition)
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