Electrochemical Performance of LSCF Cathode with GDC lnterlayer on ScSZ Electrolyte

A symmetrical LSCF (La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ )/ScSZ (89ZrO₂-10Sc₂O₃-1CeO₂)/LSCF electrochemical cell with a GDC (Gadolinium-Doped Ceria, 90CeO₂-10Gd₂O₃) interlayer that was inserted between the LSCF cathode and ScSZ electrolyte was fabricated, and the electrochemical performance of these cells was evaluated. The GDC interlayer was deposited on a ScSZ electrolyte using a screen-printing technique. The GDC interlayer prevented the unfavorable solid-state reactions at the LSCF/ScSZ interfaces. The LSCF cathode on the GDC interlayer had excellent electrocatalytic performance even at 650℃. The Area Specific Resistance (ASR) was strongly dependent on the thickness and heat-treatment temperature of the GDC interlayer. The impedance spectra showed that the cell with a 15~27 μm thick GDC interlayer heat-treated at 1200℃ had the lowest ASR.