Ce0.9Gd0.1O1.95 supported La0.6Sr0.4Co0.2Fe0.8O3-delta cathodes for solid oxide fuel cells

Title
Ce0.9Gd0.1O1.95 supported La0.6Sr0.4Co0.2Fe0.8O3-delta cathodes for solid oxide fuel cells
Author(s)
김혜경김주희[김주희]
Keywords
YTTRIA-STABILIZED ZIRCONIA; FERRITE-BASED PEROVSKITES; YSZ COMPOSITE CATHODES; INTERMEDIATE TEMPERATURE; ELECTROCHEMICAL PERFORMANCE; SURFACE-AREA; DOPED CERIA; SOFC; MICROSTRUCTURE; CONDUCTIVITY
Issue Date
201208
Publisher
ELSEVIER SCI LTD
Citation
CERAMICS INTERNATIONAL, v.38, no.6, pp.4669 - 4675
Abstract
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 La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF), Ga doped ceria (Ce0.9Gd0.1O1.95, 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 Omega cm(2), 0.03 Omega cm(2), 0.11 Omega cm(2), and 0.37 Omega cm(2) at 800 degrees C, 750 degrees C, 700 degrees C, and 650 degrees C, respectively. The simply mixed composite cathode with LSCF and GDC of the same compositions shows 0.05 Omega cm(2), 0.2 Omega cm(2), 0.56 Omega cm(2), and 1.20 Omega cm(2) at 800 degrees C, 750 degrees C, 700 degrees C, and 650 degrees C, respectively. The fuel cell performance of the SOFC with 15LSCF/GDC shows maximum power densities of 1.45 W cm(-2), 1.2W cm(-2), and 0.8W cm(-2) at 780 degrees C, 730 degrees C, and 680 degrees 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. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/27555http://dx.doi.org/10.1016/j.ceramint.2012.02.049
ISSN
0272-8842
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공과대학 > 신소재공학부 > Articles
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