Using equivalent circuit models in understanding the performance change of metal supported SOFCs in static and dynamic conditions

Kurzfassung

The current paper attempts to use equivalent circuit diagrams to simulate impedance spectra of metal supported SOFCs. Measured electrical impedance spectroscopy data on full cells was fitted to an equivalent circuit with the aim to evaluate the contribution of each functional layer towards the ASR of the cell separately. Further, the suitability of equivalent circuit diagrams to predict changes in cell behavior due to alteration in electrodes was investigated. For that purpose, two approaches were opted. First one consisted of replacing LSM cathode with LSCF cathode whereas the second comprised of redox cycling of cells provoking degradation in anodes and overall performance of the cells. Not only was the break down of the losses underlined, but also the limiting factors in the performance of metal supported cells were studied.