Abstract
Beside the standard manufacturing routes for ESCs and ASCs, the co-firing of an all-ceramic inert supported cell concept makes it possible to increase the marketability of SOFCs. Thereby, the co-firing temperature of 1100°C<T<1300°C is a compromise between the electrolyte requiring high temperatures and low-temperature cathode sintering. This process has an impact on the microstructure, on the number of triple-phase boundaries and the respective performance (cathodic polarization resistance). In the present study, thirteen different cathode materials were examined by SEM, XRD and EIS. These cathode materials range from well-known perovskite materials, e.g. LSCF, to the new Ruddlesden-Popper phases, e.g. La4Ni3O10, displaying a strong influence of the co-firing temperature e.g. cathode decomposition. These findings underline the need for precisely tailoring the cathodic properties to the manufacturing route and therefore lead to a reconsideration of cathodes which are commonly known to display low electrocatalytic activity as they might offer the required thermal stability.
Published Version
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