Preparation and evaluation of Ca_{3鈭?span style='font-style: italic'>x}Bi_xCo₄O_{9鈭?span style='font-style: italic'>未} (0<聽x聽鈮ぢ?.5) as novel cathodes for intermediate temperature-solid oxide fuel cells

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• 作者：Jing Zou^a ; Jungdeok Park^a ; Heechul Yoon^a ; Taewook Kim^a ; Jongshik Chung^a ; ^b ; ^{jsc@postech.ac.kr}
• 关键词：Intermediate temperature-solid oxide fuel cell (IT-SOFC) ; Ca3&minus ; xBixCo4O9&minus ; 未 cathode materials ; Oxygen nonstoichiometry ; O2-temperature programmed desorption (O2-TPD) ; Cathode polarization resistance (Rp) ; Electrochemical performance
• 刊名：International Journal of Hydrogen Energy
• 出版年：2012
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：May, 2012
• 卷：37
• 期：10
• 页码：8592-8602
• 文件大小：2133 K

摘要

The misfit compounds Ca_3鈭?em>xBi_xCo₄O_9鈭?em>未 (x聽=聽0.1-0.5) were successfully synthesized via conventional solid state reaction and evaluated as cathode materials for intermediate temperature-solid oxide fuel cells. The powders were characterized by X-ray diffraction, scanning emission microscopy, X-ray photoelectron spectroscopy, thermogravimetry analysis and oxygen-temperature programmed desorption. The monoclinic Ca_3鈭?em>xBi_xCo₄O_9鈭?em>未 powders exhibit good thermal stability and chemical compatibility with Ce_0.8Sm_0.2O_2鈭?em>纬 electrolyte. Among the investigated single-phase samples, Ca_2.9Bi_0.1Co₄O_9鈭?em>未 shows the maximal conductivity of 655.9聽S聽cm^鈭? and higher catalytic activity compared with other Ca_3鈭?em>xBi_xCo₄O_9鈭?em>未 compositions. Ca_2.9Bi_0.1Co₄O_9鈭?em>未 also shows the best cathodic performance and its cathode polarization resistance can be further decreased by incorporating 30聽wt.%Ce_0.8Sm_0.2O_2鈭?em>纬. The maximal power densities of the NiO/Ce_0.8Sm_0.2O_2鈭?em>纬 anode-supported button cells fabricated with the Ce_0.8Sm_0.2O_2鈭?em>纬 electrolyte and Ca_2.9Bi_0.1Co₄O_9鈭?em>未聽+聽30聽wt.%Ce_0.8Sm_0.2O_2鈭?em>纬 cathode reach 430 and 320聽mW聽cm^鈭? at 700 and 650聽掳C respectively.