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Combustion Synthesis of Alternative Cu‐GCO Anodes for SOFCs, and Cofiring of Electrolyte‐Anode Bilayers at Reduced Temperatures
Author(s) -
Mather G.C.,
Fagg D.P.,
Ringuedé A.,
Frade J.R.
Publication year - 2001
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/1615-6854(200112)1:3/4<233::aid-fuce233>3.0.co;2-1
Subject(s) - cermet , materials science , electrolyte , anode , cofiring , chemical engineering , sintering , combustion , cobalt , ceramic , metallurgy , chemistry , electrode , organic chemistry , engineering
CuO‐GCO powders have been prepared by combustion synthesis, co‐pressed onto a green GCO layer, co‐sintered, and then reduced to obtain Cu‐GCO cermet anodes for SOFCs. Cermets with Cu contents from 20 to 50 vol.% were synthesised. The anode precursor powder obtained by combustion synthesis is a composite of CuO and GCO, with a nanoscaled GCO grain size. The green GCO substrate (Gd 0.2 Ce 0.8 O 2–δ ) was prepared from commercial powders, with a sintering additive added as cobalt nitrate solution, to be able to sinter the bilayered samples at 1000 °C or lower. On reduction in 10%H 2 –90%N 2 in a temperature range of 600–800 °C, the anode is reduced to porous Cu‐GCO cermet with good adherence to the dense GCO electrolyte layer. Van der Pauw d.c. conductivity measurements on Cu‐GCO cermets with varying Cu contents indicate that a Cu content of 40vol.% is beyond the percolation limit for metallic conductivity.