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La(Sr)FeO 3 SOFC Cathodes with Marginal Copper Doping
Author(s) -
Simner Steven P.,
Anderson Michael D.,
Stevenson Jeffry W.
Publication year - 2004
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2004.01471.x
Subject(s) - materials science , cathode , cubic zirconia , monoclinic crystal system , yttria stabilized zirconia , copper , electrolyte , zirconate , strontium , doping , anode , perovskite (structure) , sintering , analytical chemistry (journal) , mineralogy , metallurgy , inorganic chemistry , electrode , crystallography , crystal structure , chemistry , ceramic , titanate , optoelectronics , organic chemistry , chromatography
(La 0.8 Sr 0.2 ) 0.98 Fe 0.98 Cu 0.02 O 3−δ can be sintered directly onto YSZ (without the need for a protective ceria interlayer). Though subject to an extended “burn‐in” period (∼200 h), anode‐supported YSZ cells using the Cu‐doped LSF achieve power densities ranging from 1.3 to 1.7 W/cm 2 at 750°C and 0.7 V. These cells have also demonstrated 500 h of stable performance. The results are somewhat surprising given that XRD indicates an interaction between (La 0.8 Sr 0.2 ) 0.98 Fe 0.98 ‐Cu 0.02 O 3−δ and YSZ resulting in the formation of strontium zirconate and/or monoclinic zirconia. The amount and type of reaction product was found to be dependent on cathode and electrolyte powder precalcination temperatures.