Investigation of solid oxide fuel cell sealing behavior under stack relevant conditions at Forschungszentrum Jülich

Effects of the first heat up procedure on mechanical properties of solid oxide fuel cell sealing materials

“…The only component of these that can offer a significant amount of deformability is the seal, which needs to compensate for manufacturing and assembly tolerances of other components in a stack. Understanding mechanical properties of sealing materials is important as improper seal design can lead to poor electrical contact, gas leakages and cause additional mechanical stresses to the stack [1,2,3,4]. A stack designer needs to know the mechanical properties of the seals not only at room temperature or at operating temperature but throughout the whole operating region.…”

Oxidation studies of anodes layer microstructures in metal supported solid oxide fuel cells

“…The interest in solid oxide fuel cell based systems for stationary and mobile applications has increased in recent years [1,2]. Detailed post-test analysis of operated stacks permitted improvements in materials and stack design [3,4].…”

Residual Stress Assessment for Thin 8YSZ Electrolytes Using Focused Ion Beam Milling and Digital Image Correlation

“…Operation temperatures are usually above 700°C to warrant the necessary catalytic activity and ionic conductivity of the ceramic electrolyte [2]. Lowering the operating temperature of SOFCs brings many advantages with respect to cost reduction, a simplified sealing and in addition a high power density at a particular temperature which reduces the number of cells in a system for a fixed power output [3].…”

“…However, in addition to the high demands on long-term chemical stability, the SOFCs are also exposed to stresses induced by differences in thermal expansion during thermocycling or in-plane temperature gradients [2,8]. With respect to reliability, the mechanical stability of the substrate material [9,10] and the residual stress state of the cell are of main importance to assess the failure probability [11] and re-oxidation stability [12], both being of strong relevance for the operation of SOFC systems.…”