Thermodynamic and kinetic considerations on degradations in solid oxide fuel cell cathodes

Sulfur as Pollutant Species on the Cathode Side of a SOFC System

“…A higher activity of SrO in LSC compared to LSM is reported (17) (15). Moreover, reactants of the basic SrO should be acidic.…”

Strontium Diffusion in Magnetron Sputtered Gadolinia‐Doped Ceria Thin Film Barrier Coatings for Solid Oxide Fuel Cells

“…These findings correspond with earlier reports as grain boundary diffusion of Sr in Gd 0.2 Ce 0.8 O 1.9 has been found to be 10 5 times larger than the bulk diffusion and both calculations and experiments has shown grain boundaries as the dominant route for Sr diffusion. [24,27,28] figure 5b forming in the YSZ-CGO interface at the grain boundaries and spreading out along the interface. In figure 4 the density of these grains over the LSCF substrate is so high that when they elongate along the YSZ-CGO interface they come into contact and form a large continuous layer.…”

Novel Composite Materials for SOFC Cathode-Interconnect Contact

“…A substantially higher amount of Cr was detected in the contact material than in the cathode, indicating that LSCF reacts with the migrating Cr species and effectively traps them within the contact layer. The formation of SrCrO 4 crystals was widely reported in Co-containing perovskites such as (La,Sr)CoO 3 (LSC) and LSCF following exposure to Cr-containing vapors at elevated temperatures [32][33][34], and it is believed that this reaction is the primary mechanism for Cr capture in the Ag-LSCF composite contact materials. The mechanism for Cr reactivity in LSCF differs from that of LSM in that the SrCrO 4 crystals form directly on the surface of LSCF, effectively capturing the Cr and preventing further Cr migration within the cell [35].…”