Characterization of cation-ordered perovskite oxide LaBaCo₂O_5+未 as cathode of intermediate-temperature solid oxide fuel cells

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• 作者：Shengli Pang^a ; Xuening Jiang^a ; ^{xnjiang@dlut.edu.cn} ; Xiangnan Li^a ; Zhixian Su^a ; Hongxia Xu^a ; Qiuli Xu^a ; Chonglin Chen^b
• 关键词：Cation-ordered perovskite ; Cathode ; Structure ; 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：April, 2012
• 卷：37
• 期：8
• 页码：6836-6843
• 文件大小：794 K

摘要

A-site cation-ordered perovskite oxide LaBaCo₂O_5+未 (LBCO) was synthesized and evaluated as a cathode material of intermediate-temperature solid oxide fuel cells (IT-SOFCs). LBCO was structurally stable when calcined at 850聽掳C in air but transformed into cation-disordered structure at 1050聽掳C. LBCO showed chemical compatibility with Gd_0.1Ce_0.9O_1.95 (GDC) electrolyte at 850聽掳C and 1000聽掳C in air. Conductivity of LBCO firstly increased slightly with higher temperature to a maximum of 470聽S聽cm^鈭? at 鈭?50聽掳C and then decreased gradually with further increase in temperature. Electrochemical impedance spectra of the LBCO/GDC/LBCO symmetric cell were measured, and electrode reaction mechanism for the LBCO cathode was analyzed. The electrode polarization resistance of LBCO was mainly contributed by oxygen ionic transfer across the cathode/electrolyte interface and oxygen atom diffusion-electronic charge transfer process. Low area-specific resistances with values ranging from 0.15聽惟聽cm² at 650聽掳C to 0.0086聽惟聽cm² at 800聽掳C were obtained. These results have demonstrated that the A-site cation-ordered perovskite oxide LBCO is a promising cathode material for IT-SOFCs.