TY - GEN
T1 - Oxygen nonstoichiometry of perovskite-type La 0.6Sr 0.4Co 1-yFe yO 3-δ (y=0.2, 0.4, 0.5, 0.6, 0.8, 1) SOFC cathode materials
AU - Kuhn, M.
AU - Fukuda, Y.
AU - Hashimoto, S.
AU - Sato, K.
AU - Yashiro, K.
AU - Mizusaki, J.
PY - 2011
Y1 - 2011
N2 - The oxygen nonstoichiometry of La 0.6Sr 0.4Co 1-yFe yO 3-δ (LSCF) mixed-conducting perovskite-oxides can be classified into two groups: the cobalt-rich compounds (y=0, 0.2, 0.4) were previously reported to show a sharp decrease in oxygen content with reducing atmosphere, while the oxygen vacancy concentration increased more smoothly for the iron-rich compounds (y=0.6, 0.8, 1). Here we measured the oxygen content of LSCF with y=0.5 by thermogravimetry and coulometric titration as a function of oxygen partial pressure and temperature. No transitional behavior could be observed for La 0.6Sr 0.4Co 0.5Fe 0.5O 3-δ, the oxygen nonstoichiometry showed the same behavior as for the cobalt-rich compounds. Except for y=1, the thermochemical stability of LSCF was little affected by the iron dopant content; all compounds (y=0-0.8) decomposed at similar oxygen partial pressures.
AB - The oxygen nonstoichiometry of La 0.6Sr 0.4Co 1-yFe yO 3-δ (LSCF) mixed-conducting perovskite-oxides can be classified into two groups: the cobalt-rich compounds (y=0, 0.2, 0.4) were previously reported to show a sharp decrease in oxygen content with reducing atmosphere, while the oxygen vacancy concentration increased more smoothly for the iron-rich compounds (y=0.6, 0.8, 1). Here we measured the oxygen content of LSCF with y=0.5 by thermogravimetry and coulometric titration as a function of oxygen partial pressure and temperature. No transitional behavior could be observed for La 0.6Sr 0.4Co 0.5Fe 0.5O 3-δ, the oxygen nonstoichiometry showed the same behavior as for the cobalt-rich compounds. Except for y=1, the thermochemical stability of LSCF was little affected by the iron dopant content; all compounds (y=0-0.8) decomposed at similar oxygen partial pressures.
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U2 - 10.1149/1.3570177
DO - 10.1149/1.3570177
M3 - Conference contribution
AN - SCOPUS:84863161203
SN - 9781607682363
T3 - ECS Transactions
SP - 1881
EP - 1890
BT - Solid Oxide Fuel Cells 12, SOFC XII
T2 - 12th International Symposium on Solid Oxide Fuel Cells, SOFC-XII - 219th ECS Meeting
Y2 - 1 May 2011 through 6 May 2011
ER -