Cobalt-free Sr_0.7Y_0.3CuO_2+未 as a cathode for intermediate-temperature solid oxide fuel cell

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• 作者：Xifeng Ding ; Xiaojia Gao ; Jingyu Shen ; Jun Wang ; Wenliang Zhu ; Xiong Wang ; Jinguo Jiang
• 关键词：Solid oxide fuel cell ; Cathode ; Cobalt-free oxide ; Electrochemical performance
• 刊名：International Journal of Hydrogen Energy
• 出版年：13 January, 2014
• 年：2014
• 卷：39
• 期：2
• 页码：1030-1038
• 全文大小：1389 K

文摘

Cobalt-free oxide Sr_0.7Y_0.3CuO_2+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 Sr_1鈭?em>xY_xCuO_2+未 and Sr_2鈭?em>xY_xCuO_3+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 (R_p) 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.