Ce_0.9Gd_0.1O_1.95 supported La_0.6Sr_0.4Co_0.2Fe_0.8O_{3鈭?span style='font-style: italic'>未} cathodes for solid oxide fuel cells

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• 作者：Ju Hee Kim ; Haekyoung Kim ; ^{hkkim@ynu.ac.kr}
• 关键词：Solid oxide fuel cell ; Cathodes ; Anode supported cell ; Mixed ionic electronic conductor ; Supported cathode
• 刊名：Ceramics International
• 出版年：2012
• 期刊代码：13_02728842
• 类别：ms
• 出版时间：August, 2012
• 卷：38
• 期：6
• 页码：4669-4675
• 文件大小：1353 K

摘要

Lanthanum-based iron- and cobalt-containing perovskite has a high potential as a cathode material because of its high electro-catalytic activity at a relatively low operating temperature in solid oxide fuel cells (SOFCs) (600-800). To enhance the electro-catalytic reduction of oxidants on La_0.6Sr_0.4Co_0.2Fe_0.8O_3鈭?em>未 (LSCF), Ga doped ceria (Ce_0.9Gd_0.1O_1.95, GDC) supported LSCF (15LSCF/GDC) is successfully fabricated using an impregnation method with a ratio of 15 wt%LSCF and 85 wt%GDC. The cathodic polarization resistances of 15LSCF/GDC are 0.015 惟 cm², 0.03 惟 cm², 0.11 惟 cm², and 0.37 惟 cm² at 800 掳C, 750 掳C, 700 掳C, and 650 掳C, respectively. The simply mixed composite cathode with LSCF and GDC of the same compositions shows 0.05 惟 cm², 0.2 惟 cm², 0.56 惟 cm², and 1.20 惟 cm² at 800 掳C, 750 掳C, 700 掳C, and 650 掳C, respectively. The fuel cell performance of the SOFC with 15LSCF/GDC shows maximum power densities of 1.45 W cm^鈭?, 1.2 W cm^鈭?, and 0.8 W cm^鈭? at 780 掳C, 730 掳C, and 680 掳C, respectively. GDC supported LSCF (15LSCF/GDC) shows a higher fuel cell performance with small compositions of LSCF due to the extension of triple phase boundaries and effective building of an electronic path.