Electrochemical characterization of La<sub>0.6sub>Ca<sub>0.4sub>Fe<sub>0.8sub>Ni<sub>0.2sub>O<sub>3?<span style='font-style: italic'>¦Äsub> perovskite cathode for?IT-SOFC

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• 作者：N. Ortiz-Vitoriano<sup>asup> ; A. Hauch<sup>bsup> ; I. Ruiz de Larramendi<sup>asup> ; C. Bernuy-Ló ; pez<sup>bsup><sup> ; sup><sup>csup> ; R. Knibbe<sup>bsup><sup> ; sup><sup>1sup> ; T. Rojo<sup>asup><sup> ; sup><sup>csup><sup> ; sup><sup>teo.rojo@ehu.essup>
• 关键词：Solid oxide fuel cell ; Cathode ; Electrochemical impedance spectroscopy ; Mixed conductors
• 刊名：Journal of Power Sources
• 出版年：2013
• 出版时间：1 October, 2013
• 年：2013
• 卷：239
• 期：Complete
• 页码：196-200
• 全文大小：1165 K

文摘

Electrolyte supported symmetric cells featuring La<sub>0.6sub>Ca<sub>0.4sub>Fe<sub>0.8sub>Ni<sub>0.2sub>O<sub>3sub> (LCFN) electrodes are studied by electrochemical impedance spectroscopy. The aim is to describe the polarization losses of this mixed ionic electronic conductor electrode at various cell operating conditions for cells sintered at different temperatures. An equivalent circuit describing the cathode polarization resistances was constructed from analyzing impedance spectra recorded at different oxygen partial pressures and temperatures. Favorable oxygen reduction reaction properties are demonstrated for the LCFN cell sintered at 750?¡ãC with a polarization resistance of 0.05?¦¸?cm<sup>2sup> at an operating temperature of 800?¡ãC in pure oxygen.