TY - JOUR
T1 - The effects of minor components in LSCF cathode on oxygen reduction reaction
AU - Oishi, Junya
AU - Otomo, Junichiro
AU - Oshima, Yoshito
AU - Koyama, Michihisa
PY - 2013
Y1 - 2013
N2 - Minor components in a porous electrode of solid oxide fuel cells (SOFCs) can affect the electrode performance. In this study, we focus on minor components derived from raw materials and production processes. Standard polycrystalline dense cathode samples of La0.6Sr0.4Co 0.2Fe0.8O3-δ (LSCF) were prepared using high purity raw materials by Pechini method. To evaluate the effects of the minor components on LSCF performance, minor components such as Ba, Ca, Al and Si were added to the LSCF samples. Chemical diffusion coefficient (Dchem) and surface exchange coefficient (ktr) were obtained as cathode performance factors by the conductivity relaxation measurement. The results showed that Al and Si have mostly negative effects for oxygen reduction reaction on LSCF while Ba and Ca were inert or showed positive effects for the cathode performance. We also discussed the mechanism of positive effect of Ca (Dchem,STD 〈 Dchem,Ca and ktr,STD 〈 ktr,Ca ) using XPS measurement.
AB - Minor components in a porous electrode of solid oxide fuel cells (SOFCs) can affect the electrode performance. In this study, we focus on minor components derived from raw materials and production processes. Standard polycrystalline dense cathode samples of La0.6Sr0.4Co 0.2Fe0.8O3-δ (LSCF) were prepared using high purity raw materials by Pechini method. To evaluate the effects of the minor components on LSCF performance, minor components such as Ba, Ca, Al and Si were added to the LSCF samples. Chemical diffusion coefficient (Dchem) and surface exchange coefficient (ktr) were obtained as cathode performance factors by the conductivity relaxation measurement. The results showed that Al and Si have mostly negative effects for oxygen reduction reaction on LSCF while Ba and Ca were inert or showed positive effects for the cathode performance. We also discussed the mechanism of positive effect of Ca (Dchem,STD 〈 Dchem,Ca and ktr,STD 〈 ktr,Ca ) using XPS measurement.
UR - http://www.scopus.com/inward/record.url?scp=84904968524&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84904968524&partnerID=8YFLogxK
U2 - 10.1149/05701.1909ecst
DO - 10.1149/05701.1909ecst
M3 - Article
AN - SCOPUS:84904968524
SN - 1938-5862
VL - 57
SP - 1909
EP - 1916
JO - ECS Transactions
JF - ECS Transactions
IS - 1
ER -