TY - JOUR
T1 - The effects of minor elements in La0.6Sr0.4Co0.2Fe0.8O3-δ cathodes on oxygen reduction reaction
AU - Oishi, Junya
AU - Otomo, Junichiro
AU - Oshima, Yoshito
AU - Koyama, Michihisa
N1 - Funding Information:
Material characterization such as ICP-AES, XRD and SEM was performed at the Institute for Solid State Physics, the University of Tokyo. XPS analysis was supported by the “Nanotechnology Platform” (project No. 12024046 ) of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan . Activities of Inamori Frontier Research Center, Kyushu University are supported by KYOCERA Corporation .
PY - 2015/3/1
Y1 - 2015/3/1
N2 - It is known that the minor elements affect the performance of solid oxide fuel cell (SOFC). In this study, we focus on the influence of minor elements on the SOFC cathode properties. The Ca, Ba, Al, and Si, which originate from raw materials and production processes for SOFC cathodes, are investigated as minor elements that may have effect on the properties of La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) cathode. To examine the effects of minor elements on the cathode properties, Ca, Ba, Al, and Si with a controlled concentration are added to the LSCF reference sample. Conductivity relaxation measurements are conducted to determine the chemical diffusion coefficient (Dchem) and surface exchange coefficient (ktr), which governs the overpotential characteristics of the LSCF cathode. The results show that Al and Si have negative effects on both Dchem and ktr while Ca and Ba do not alter Dchem and show weakly positive effects on ktr. The effects of Ca and Ba for the cathode properties are discussed on the basis of XPS measurements.
AB - It is known that the minor elements affect the performance of solid oxide fuel cell (SOFC). In this study, we focus on the influence of minor elements on the SOFC cathode properties. The Ca, Ba, Al, and Si, which originate from raw materials and production processes for SOFC cathodes, are investigated as minor elements that may have effect on the properties of La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) cathode. To examine the effects of minor elements on the cathode properties, Ca, Ba, Al, and Si with a controlled concentration are added to the LSCF reference sample. Conductivity relaxation measurements are conducted to determine the chemical diffusion coefficient (Dchem) and surface exchange coefficient (ktr), which governs the overpotential characteristics of the LSCF cathode. The results show that Al and Si have negative effects on both Dchem and ktr while Ca and Ba do not alter Dchem and show weakly positive effects on ktr. The effects of Ca and Ba for the cathode properties are discussed on the basis of XPS measurements.
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U2 - 10.1016/j.jpowsour.2014.12.001
DO - 10.1016/j.jpowsour.2014.12.001
M3 - Article
AN - SCOPUS:84919761052
VL - 277
SP - 44
EP - 51
JO - Journal of Power Sources
JF - Journal of Power Sources
SN - 0378-7753
ER -