Mixed conducting components of solid oxide fuel cell anodes
authors Tsipis, EV; Kharton, VV; Frade, JR
nationality International
journal JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
author keywords composites; electrical properties; ionic conductivity; fuel cells; cermet anode
keywords IONIC-CONDUCTIVITY; DIRECT OXIDATION
abstract Developments of intermediate-temperature solid oxide fuel cells (IT SOFCs) require novel anode materials with high electrochemical activity at 800-1070 K. In order to assess the role of oxide components of Ni- and Cu-containing cermets, a series of electrodes containing 8% yttria-stabilized zirconia (Y8SZ), Ce0.8Gd0.2O2-delta (CGO) and TbZrO4-delta with fluorite-related structure, zircon-type Ce0.8Ca0.2VO4+delta, pyrochlore Gd1.86Ca0.14Ti2O7-delta (GCTO), and La0.9Sr0.1Al0.65Mg0.15Fe0.20O3-delta perovskite, were studied in contact with (La0.9Sr0.1)(0.98)Ga0.8Mg0.2O3-delta (LSGM) electrolyte. The best performance was found for anodes comprising a stable ion-conducting component, such as Y8SZ or GCTO, and one Ce-containing phase, such as CGO or cerium vanadate. Anode performance is less dependent on the ionic conductivity of oxide components than on redox stability or interaction between different cell materials. Surface modification with ceria substantially reduces overpotentials of all cermet anodes. For Ni-CGO and Cu-CGO, such activation of yields about 100-115 mV at 1073 K and 200 mA/cm(2) in 10% H-2-90% N-2 for both anodes. (c) 2005 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0955-2219
year published 2005
volume 25
issue 12
beginning page 2623
ending page 2626
digital object identifier (doi) 10.1016/j.jeurceramsoc.2005.03.114
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000230569300134
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journal impact factor 3.794
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