The Characterization of Oxygen Deficit Cathode Sm0.5Sr0.5Co(subscript 1-x)Cu(subscript x)O(subscript 3-δ) (x=0~0.3) for Intermediate Temperature-Solid Oxide Fuel Cells (IT-SOFCs)

中溫固態氧化物燃料電池Sm0.5Sr0.5Co(下標 1-x)Cu(下標 x)O(下標 3-δ)陰極材料之特性研究

林忠達(C.T. Lin) ； 洪逸明(I.M. Hung) ； 方冠榮(K.Z. Fung) ； 洪敏雄(M.H. Hon)

《材料科學與工程》 38卷1期 (2006/03) Pp. 11-17

https://doi.org/10.6409/JMSE.200603.0011

摘要

近年來，固態氧化物燃料電池研究方向之一是希望將其操作溫度降低至500~800℃。Sm0.5Sr0.5CoO(下標 3-δ) (SSC)目前已廣泛使用在以釤摻雜氧化鈰爲電解質之中溫固態氧化物燃料電池中作爲陰極材料。本研究利用固相反應法將銅摻雜入SSC中，Sm0.5Sr0.5Co(下標 1-x)Cu(下標 –x) (X=0~0.3) (SSCC)。利用X-ray繞射儀及熱機械儀分析此材料之結構、熱相容性及熱膨脹係數。SSCC之界面極化現象經交流阻抗分析證實較SSC低。Sm0.5Sr0.5Co0.8Cu0.2O(下標 3-δ)在500℃及800℃之導電性分別爲466 S/cm及360 S/cm。

關鍵字

中溫固態氧化物燃料電池 ； 交流阻抗 ； 陰極材料

並列摘要

The recent research of solid oxide fuel cells (SOFCs) is focus on reduces the operating temperature from high temperature to intermediate temperature. Sm0.5Sr0.5CoO(subscript 3-δ) (SSC) was a common mixed ionic and electronic conductor (MIEC) for IT-SOFCs cathode between 500~800℃ based on Samarium-doped ceria (SDC) electrolyte. In this study, new oxygen deficit cathode Copper-doped SSC, Sm0.5Sr0.5Co(subscript 1-x)Cu(subscript x) (X=0~0.3) (SSCC) was prepared by conventional solid state reaction. The structure characterization, thermal compatibility and the thermal expansion coefficients (TECs) were analyzed by X-ray diffraction (XRD) and Thermal mechanical analyzer (TMA). The ionic conductivity of SSCC was expected to be enhanced due to the measurement of ac impedance spectroscopy investigations revealed that an interfacial polarization resistance of Cu-doped SSC was lower than conventional SSC cathode. The electrical conductivity of SSCC decreased while Cu substituting for Co and the Sm0.5Sr0.5Co0.8Cu0.2O(subscript 3-δ) cathode exhibit the maximum conductivity that was 466 S/cm and 360 S/cm at 500℃ and 800℃. However, it was high enough to be IT-SOFCs cathode.

並列關鍵字

GIT-SOFCs ； AC-impedance ； Cathode material