TY - JOUR
T1 - New buffer layer material La(Pr)CrO 3 for intermediate temperature solid oxide fuel cell using LaGaO 3-based electrolyte film
AU - Ju, Young Wan
AU - Hong, Jong Eun
AU - Hyodo, Junji
AU - Inagaki, Toru
AU - Ida, Shintaro
AU - Ishihara, Tatsumi
PY - 2012/8/14
Y1 - 2012/8/14
N2 - A metal-supported solid oxide fuel cell (SOFC) using Ce 0.8Sm 0.2O 2 (Sm-doped ceria, SDC) buffer layer and La 0.9Sr 0.1Ga 0.8Mg 0.2O 3 (LSGM) electrolyte films showed a small degradation in the cell performance after a long-term operation because of La migration from the electrolyte to the buffer layer, resulted in a formation of a less conductive phase. Thus, various ceramic materials such as doped ceria and perovskite-related oxides were investigated for an effective buffer layer with respect to fabricating reliable metal-supported SOFCs using a LSGM electrolyte film. In particular, La-doped CeO 2 (LDC) and Pr-doped LaCrO 3 (LPCr) were investigated as buffer layer material since the materials showed chemical compatibility with the LSGM and anode materials. The cell using a LDC buffer layer showed a prior stability during the operation for 100 h at 973 K, while the power density of the cell was slightly low owing to the low electrical conductivity of LDC compared with that of SDC or LPCr. In contrast, the cell using a LPCr buffer layer revealed significantly low open circuit voltage (OCV) and power density, which were attributed to Pr decomposition in the LPCr caused by the reactivity with water vapor. However, the metal-supported cell with a multilayer electrolyte film including LSGM/LPCr/SDC layers showed an almost theoretical OCV and reasonably high power density with no degradation after a long-term operation for 100 h at 973 K, suggesting that the LPCr layer effectively prevented La migration and the SDC layer led to avoid the Pr decomposition. Thus, a LPCr is an effective buffer layer material for reliable metal-supported SOFCs using a LSGM electrolyte thin film.
AB - A metal-supported solid oxide fuel cell (SOFC) using Ce 0.8Sm 0.2O 2 (Sm-doped ceria, SDC) buffer layer and La 0.9Sr 0.1Ga 0.8Mg 0.2O 3 (LSGM) electrolyte films showed a small degradation in the cell performance after a long-term operation because of La migration from the electrolyte to the buffer layer, resulted in a formation of a less conductive phase. Thus, various ceramic materials such as doped ceria and perovskite-related oxides were investigated for an effective buffer layer with respect to fabricating reliable metal-supported SOFCs using a LSGM electrolyte film. In particular, La-doped CeO 2 (LDC) and Pr-doped LaCrO 3 (LPCr) were investigated as buffer layer material since the materials showed chemical compatibility with the LSGM and anode materials. The cell using a LDC buffer layer showed a prior stability during the operation for 100 h at 973 K, while the power density of the cell was slightly low owing to the low electrical conductivity of LDC compared with that of SDC or LPCr. In contrast, the cell using a LPCr buffer layer revealed significantly low open circuit voltage (OCV) and power density, which were attributed to Pr decomposition in the LPCr caused by the reactivity with water vapor. However, the metal-supported cell with a multilayer electrolyte film including LSGM/LPCr/SDC layers showed an almost theoretical OCV and reasonably high power density with no degradation after a long-term operation for 100 h at 973 K, suggesting that the LPCr layer effectively prevented La migration and the SDC layer led to avoid the Pr decomposition. Thus, a LPCr is an effective buffer layer material for reliable metal-supported SOFCs using a LSGM electrolyte thin film.
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U2 - 10.1557/jmr.2012.187
DO - 10.1557/jmr.2012.187
M3 - Article
AN - SCOPUS:84864536205
VL - 27
SP - 1906
EP - 1914
JO - Journal of Materials Research
JF - Journal of Materials Research
SN - 0884-2914
IS - 15
ER -