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The performance of Pt/YSZ and LSM/YSZ composite SOFC electrodes as a function of the electrode composition is investigated experimentally. The qualitative features of the impedance spectra are similar for both cathodes; in particular, in both the electrode performance shows a dome-shaped curve as a function of the electrode composition. Nevertheless, the quantitative aspects are very different; in particular, the electrode performance is much higher for the LSM/YSZ electrode than for Pt/YSZ. Also, the composition which gives the maximum performance and the experimental values of the percolation thresholds are different. The reasons for the discrepancies are analysed and discussed.
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metals in the current collectors and improving the control electronics, even larger hydrogen generation cell structures are needed. These will not only increase the energy available, but also the power density.