TY - JOUR
T1 - Improved reoxidation tolerance of Ni-Fe metal support for LaGaO 3 thin film electrolyte cell
AU - Ju, Young Wan
AU - Ida, Shintaro
AU - Inagaki, Toru
AU - Ishihara, Tatsumi
PY - 2012/5/28
Y1 - 2012/5/28
N2 - Effects of reoxidation and reduction treatment of a Ni-Fe metallic anode substrate were investigated as a function of reoxidation period and temperature. The NiFe 2O 4 composite anode substrate was highly dense before the reduction treatment. However, after reduction for 2 h in H 2 atmosphere, the dense oxide composite substrate was changed to a porous metal substrate consisting of a Ni-Fe alloy. The metallic substrate was then reoxidized in 100% O 2. When the reoxidation treatment was performed, the porous substrate regained its original density. However, XRD patterns of the reoxidized substrate still exhibited strong Ni base alloy peaks. Moreover, SEM-EDX analysis showed that a large part of the reoxidized substrate was porous and a dense iron base oxide layer formed at the surface of the substrate. In addition, after reduction for 2 h with hydrogen gas, the substrate returned to a porous metal substrate again. Therefore, in spite of slightly increased anodic IR loss and a small fuel-leakage, which was observed after the reoxidation and reduction cycles, the Ni-Fe metal supported cell showed an excellent reoxidation tolerance at 973 K.
AB - Effects of reoxidation and reduction treatment of a Ni-Fe metallic anode substrate were investigated as a function of reoxidation period and temperature. The NiFe 2O 4 composite anode substrate was highly dense before the reduction treatment. However, after reduction for 2 h in H 2 atmosphere, the dense oxide composite substrate was changed to a porous metal substrate consisting of a Ni-Fe alloy. The metallic substrate was then reoxidized in 100% O 2. When the reoxidation treatment was performed, the porous substrate regained its original density. However, XRD patterns of the reoxidized substrate still exhibited strong Ni base alloy peaks. Moreover, SEM-EDX analysis showed that a large part of the reoxidized substrate was porous and a dense iron base oxide layer formed at the surface of the substrate. In addition, after reduction for 2 h with hydrogen gas, the substrate returned to a porous metal substrate again. Therefore, in spite of slightly increased anodic IR loss and a small fuel-leakage, which was observed after the reoxidation and reduction cycles, the Ni-Fe metal supported cell showed an excellent reoxidation tolerance at 973 K.
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U2 - 10.1016/j.ssi.2012.01.024
DO - 10.1016/j.ssi.2012.01.024
M3 - Article
AN - SCOPUS:84861093050
SN - 0167-2738
VL - 216
SP - 58
EP - 63
JO - Solid State Ionics
JF - Solid State Ionics
ER -