Characterization of layered perovskite oxides NdBa_{1鈭?span style='font-style: italic'>x}Sr_xCo₂O_5+未 (x聽=聽0 and 0.5) as cathode materials for IT-SOFC

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• 作者：Jung Hyun Kim^a ; ^{jhkim2011@hanbat.ac.kr} ; John T.S. Irvine^b
• 关键词：Layered perovskite ; Intermediate temperature-operating solid oxide fuel cell (IT-SOFC) ; Cathode ; Area specific resistance (ASR) ; Cathodic polarization
• 刊名：International Journal of Hydrogen Energy
• 出版年：2012
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：April, 2012
• 卷：37
• 期：7
• 页码：5920-5929
• 文件大小：1208 K

摘要

The crystal structure, thermal expansion, and electrochemical properties of the layered perovskite series NdBa_1鈭?em>xSr_xCo₂O_5+未 (x聽=聽0 and 0.5) were investigated to study the effects of substituting Sr for Ba on a layered perovskite oxide.

A tetragonal layered perovskite structure was observed in NdBaCo₂O_5+未 (NBCO), and a tetragonal structure was also observed in NdBa_0.5Sr_0.5Co₂O_5+未 (NBSCO) when Sr was substituted into NBCO. The thermal expansion coefficients (TECs) of NBSCO and NBCO were both bigger than 22聽脳聽10^鈭?聽K^鈭? at 530聽掳C. However, the TEC values for 50聽wt%of NBSCO and 50聽wt%of Ce_0.9Gd_0.1O_{2鈭捨?/sub> (CGO91) (NBSCO:50) were 13.2聽脳聽10^鈭?聽K^鈭? at 600聽掳C and 13.7聽脳聽10^鈭?聽K^鈭? at 700聽掳C; for 50聽wt%of NBCO and 50聽wt%of CGO91 (NBCO:50) they were 12.4聽脳聽10^鈭?聽K^鈭? at 600聽掳C and 12.5聽脳聽10^鈭?聽K^鈭? at 700聽掳C. The cathode polarizations (Rp) of NBSCO and NBCO on a CGO91 electrolyte were observed to be 0.25 and 0.11聽惟cm², respectively, at 700聽掳C. The Rps of composite cathodes in NBSCO:50 and NBCO:50 were 0.061 and 0.038聽惟cm², respectively, at 700聽掳C.}