Cathodic behavior of La0.8Sr0.2Co1-xMnxO3-delta perovskite oxide on YSZ electrolyte for intermediate temperature-operating solid oxide fuel cells

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A study of the cathode properties of an intermediate temperature-operating solid oxide fuel cell (IT-SOFC) was carried out using La0.8Sr0.2Co1-x MnxO3-delta (LSCM). LSCM-8246 had the lowest impedance on the 8 mol% yttria-stabilized zirconia (YSZ) electrolyte among the various compositions investigated in this study. A Ce0.9Gd0.1O2-delta (CGO) interlayer between LSCM and YSZ was introduced to inhibit the fori-nation of resistive phases. Cathode impedance was decreased by approximately three times compared to that shown with non-interlayer samples. Investigation of the oxygen partial pressure dependence of LSCM-8246 on CGO-layered YSZ showed that the adsorbed oxygen ionization is the rate-determining step of the cathode reaction. The cathode material and structure can be applied to IT-SOFC at 700 degrees C because the area-specific resistance is sufficiently low, leading to a cell power density higher than 0.5 W/cm(2) at 0.7 V. (C) 2008 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2008-09
Language
English
Article Type
Article; Proceedings Paper
Keywords

ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY; YTTRIA-STABILIZED ZIRCONIA; LA1-XSRXMN1-YCOYO3+/-DELTA PEROVSKITES; LANTHANUM MANGANITE; COMPOSITE CATHODES; OXYGEN-TRANSPORT; SOFC; PERFORMANCE; DIFFUSION; EXPANSION

Citation

SOLID STATE IONICS, v.179, no.27-32, pp.1465 - 1469

ISSN
0167-2738
URI
http://hdl.handle.net/10203/12237
Appears in Collection
ME-Journal Papers(저널논문)
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