Abstract
The electrochemical performance of Ag–Y0.5Bi1.5O3 cathodes on a Y0.16Zr0.84O1.92 (8YSZ)–coated Ce0.78Gd0.2Sr0.02O2–δ (GDCS) electrolyte was estimated using electrochemical impedance spectroscopy. The microstructures of the porous composite cathodes and sandwich electrolytes with fluorite structures were investigated using scanning electron microscopy and transmission electron microscopy. Silver in the cathode reduced the surface resistance which improved the current collection efficiency of the electrode. The mixtures consisting of 50 vol%–70 vol% Ag exhibited much lower overpotentials and higher exchange current densities than (La, Sr)(Co, Fe)O3–δ (LSCF) perovskite cathodes below 650 °C. The area specific resistance of the Ag–40 vol% Y0.5Bi1.5O3 cathode decreased to 0.14 Ω cm2 at 650 °C. Favorable oxygen reduction reaction properties and lower activation energies were observed when the cell was operated at temperatures above 600 °C.
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