Coplanar electrode shape

In 2009, Wei et al. reported a star-shaped stack comprised of four Ni-YSZIYSZILSM cells [21], This stack generated an OCV of approximately 3.5 V and a peak power output of 421 mW in a methane-air mixture feed at 700 °C. They concluded that the symmetric design can ensure the identical operation of each cell. On the other hand, as described in the previous section, SC-SOFCs allows for a coplanar electrode arrangement, where the two electrodes reside on the same surface of the electrolyte. Also in 2009, Kuhn et al. fabricated cells with one, two, three, four, five and ten pairs of electrodes with a width of 260 pm, thickness of 17 pm, and interelectrode gap of 114 pm [22]. The OCV roughly increased with increasing number of the electrode lines, although the maximum OCV value was as low as 0.8 V. 

Kuhn et al. (2008) tested coplanar SC-SOFCs with different curvilinear microelectrode configurations of arbitrarily complex geometry. It was shown that the performance of the cells depends only on electrode and interelectrode dimensions, not on the electrode s shape. 

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