Preparation and characterization of Ag-Bi_(1.5)Y_(0.3)Sm_(0 2)O_3 composite cathode

摘要

The electrochemical performance of Ag mixed with B_(1.5) Y_0._3Sm_(0.2)O_3 or Y_(0.5)Bi_(1.5)O_3 composite cathodes on a Ce_(0.78)Gd_(0.2)Sr_(0.02)O_(2 δ) (GDCS) electrolyte was estimated through electrochemical impedance spectroscopy. The cathode mixtures consisting of Ag-Bi_(1.5)Y_(0.3)Sm_(0.2)O_3 or Ag Y_(0.5)Bi_(1.5)O_3 exhibited lower overpotentials and higher exchange current densities than commercial Ag paste and perovskite cathodes. Favorable oxygen reduction reaction properties and low activation energies were observed when the cell was operated at temperatures near 600 °C, which is the ideal operating temperature for the energy integration of solid oxide fuel cells as part of in next-generation triple combined cycle power plants.