文摘
Cobalt-free oxide Sr0.7Y0.3CuO2+未 (SYCu) with one-dimensional structure has been investigated as potential cathode material for intermediate temperature solid oxide fuel cell (IT-SOFC) applications. The crystal structure, chemical compatibility, thermal expansion and electrochemical performance were examined by X-ray diffraction technique, electrochemical workstation and thermal dilatometer. One-dimensional structure Sr1鈭?em>xYxCuO2+未 and Sr2鈭?em>xYxCuO3+未 phases appeared as the main parts after calcination above 900聽掳C. The copper based oxide SYCu showed a thermal expansion coefficient (TEC) about 11.1聽脳聽10鈭?/掳C at 25-800聽掳C, exhibiting good physical compatibility with samarium doped cerium (SDC) electrolyte. High electro-catalytic performance was obtained for SYCu cathode in a symmetrical cell with a polarization resistance (Rp) of 0.029聽惟聽cm2 and an overpotential of 4.9聽mV at 100聽mA/cm2 at 800聽掳C, showing great promising use as cathode materials for IT-SOFCs. In addition, the polarization resistance of SYCu cathode remain constant after operation at 800聽掳C for 100聽h, showing excellent long-term stability at operation temperature.