LSCF/GDC (68 wt%) Electrode Slurry for Intermediate Temperature SOFC/SOEC, 100 g/bottle, CITSOFECESLSCFGDC
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In the production of Solid Oxide Fuel Cells (SOFC) and Electrolysis Cells (SOEC), an LSCF/GDC composite slurry is the industry-standard "ink" used to deposit the oxygen electrode. Since LSCF is a Mixed Ionic-Electronic Conductor (MIEC) and GDC is a high-performance ionic conductor, this composite maximizes the surface area available for the electrochemical reaction.
Mixing LSCF (La0.6Sr0.4Co0.2Fe0.8O3-x) with GDC (Ce0.9Gd0.1O1.95) in a slurry provides three critical advantages: (1) 3D Reaction Zone: While pure LSCF can conduct ions, its ionic conductivity is much lower than GDC. Adding GDC particles creates "ionic highways" that extend the reaction site from the electrolyte interface deep into the electrode bulk.
(2) Thermal Expansion Coefficient (TEC) Matching: Pure LSCF has a high TEC (~15 * 10^{-6} K^{-1}). Mixing it with GDC (~12 * 10^{-6} K^{-1}) brings the composite closer to the YSZ electrolyte (~10.5 * 10^{-6} K^{-1}), preventing the electrode from peeling off during thermal cycling. (3) Sintering Control: GDC particles act as "spacers" that prevent LSCF grains from over-sintering and losing porosity at operating temperatures.
A high-performance screen-printing ink typically follows this mass distribution:
When using an LSCF/GDC slurry, it is necessary to apply it over a dense GDC Barrier Layer if the electrolyte is YSZ. (1) Problem: During the 1000°C–1100 °C sintering of the LSCF slurry, Strontium (Sr) will migrate into a YSZ electrolyte and form Strontium Zirconate (SrZrO3), an insulator that significantly increases the cell's ASR (Area Specific Resistance). (2) Solution: A thin (2-}5 um) dense GDC layer acts as a chemical buffer, blocking the Sr migration while allowing oxygen ions to flow.
| Part Number |
CITSOFECESLSCFGDC (C-SOFEC-ES-LSCFGDC) |
| Active Material |
LSCF/GDC (50 wt% : 50wt%) Solid state content: 68 wt% |
| Package Grade |
100 g/bottle (other grades, such as 500 g, and 1000 g or larger can be supplied upon request) |
References:
- M. Izuki, et al., Interfacial stability and cation diffusion across the LSCF/GDC interface, J. Power Sources, 2011, 196, 7232-7236.
- Ӧ. Çelikbilek, et al., Influence of sintering temperature on morphology and electrochemical performance of LSCF/GDC composite films as efficient cathode for SOFC, Electrochimica Acta, 2017, 246, 1248-1258.