High Performance (La,Sr)(Co,Fe)O3 Cathodes with Improved Adherence for Metal-Supported Fuel Cells

Tuesday, 25 July 2017: 09:20
Grand Ballroom West (The Diplomat Beach Resort)
M. Bram (CD-Lab. "Interfaces in MSCs", Forschungszentrum Jülich GmbH, IEK-1), D. Udomsilp (CD-Lab. "Interfaces in MSCs", Forschungszentrum Jülich GmbH - IEK-1), D. Roehrens (Forschungszentrum Jülich GmbH, IEK-1, CD-Lab. "Interfaces in MSCs"), N. H. Menzler (Forschungszentrum Jülich GmbH, IEK-1), A. K. Opitz (TU Wien, CD-Lab. "Interfaces in MSCs"), L. G. J. de Haart (Forschungszentrum Jülich GmbH, IEK-9), and O. Guillon (Forschungszentrum Jülich GmbH, IEK-1, Jülich Aachen Research Alliance, JARA-Energy)
A novel sintering approach was developed in order to overcome the issue of insufficient adherence of (La,Sr)(Co,Fe)O3 type cathodes in metal-supported solid oxide fuel cells (MSCs). Investigation of the phase stability of the perovskite structure at high temperature in various atmospheres with low oxygen partial pressures provided the basis for the development of a sintering procedure applicable to full-cells. By investigating the layer adherence, time dependent mechanical integrity and reversibility of phase transformations, metal-supported cells with sintered cathodes could be produced reliably and were electrochemically characterized in single cell measurements. The novel sintering approach of such cathodes resulted in a significantly enhanced mechanical stability of the cathode layers. Extensive spallation of the cathode was prevented, which is a substantial improvement in comparison with state-of-the-art MSCs. Furthermore, the electrochemical measurements revealed a beneficial effect regarding the cell performance. Post-test characterization is assumed to provide further information regarding the quality of bonding between cathode and electrolyte. Further investigations cover the implementation of alternative high-performance cathode materials like LSC as well as the combination with optimized anode structures/compositions.