02

Current Density (nWarf)

Fig. 4 Voltage losses in the fuel cell showing the large magnitude of the cathode loss

Cathode Properties

The interface resistances of several cathode materials measured by impedance spectroscopy using reference electrodes are shown in fig. 5. Single phase porous cathodes (Lao.6Sro.4Mno.8Cooo03.s and LSCF) performed better for materials with an increasing ability to lose oxygen from its lattice when compared to the Lai.xSrJlMnC>3.5 (not shown in figure) cathode used with zirconia-based fuel cells. This presumably stems from an increased ionic conductivity or diffusion while still maintaining electronic conductivity high enough for a cathode.

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