TY - JOUR
T1 - Effect of Bi2O3 on the electrochemical performance of LaBaCo2O5+δ cathode for intermediate-temperature solid oxide fuel cells
AU - Li, Ruifeng
AU - Wang, Dalei
AU - Ge, Lin
AU - He, Shoucheng
AU - Chen, Han
AU - Guo, Lucun
PY - 2014/3
Y1 - 2014/3
N2 - The LaBaCo2O5+δ-x wt.% Bi2O 3 (LBCO-xBi2O3, x=10, 20, 30, and 40) were prepared as composite cathodes for intermediate-temperature solid oxide fuel cells (IT-SOFCs) via the conventional mechanical mixing method. The effect of Bi2O3 on polarization resistance, overpotential, and long-term stability of the LBCO cathode was investigated. An effective sintering aid for LBCO cathode, Bi2O3 not only lowers its sintering temperature by ~200 C, but also improves the electrochemical performance within the intermediate temperature range of 600-800 C. Electrochemical impedance spectroscopy measurements showed that the addition of 20 wt% Bi 2O3 to LBCO exhibited the lowest area-specific resistance of 0.020 Ω cm2 at 800 C in air, which was about a seventh of that of the LBCO cathode at the same condition. At a current density of 0.2 A cm-2, the cathodic overpotential of LBCO-20Bi2O 3 was about 12.6 mV at 700 C, while the corresponding value for LBCO was 51.0 mV. Compared to B2O3-Bi2O 3-PbO frit, the addition of Bi2O3 significantly improved the long-term stability of cathode. Therefore, LBCO-20Bi 2O3 can be a promising cathode for IT-SOFCs.
AB - The LaBaCo2O5+δ-x wt.% Bi2O 3 (LBCO-xBi2O3, x=10, 20, 30, and 40) were prepared as composite cathodes for intermediate-temperature solid oxide fuel cells (IT-SOFCs) via the conventional mechanical mixing method. The effect of Bi2O3 on polarization resistance, overpotential, and long-term stability of the LBCO cathode was investigated. An effective sintering aid for LBCO cathode, Bi2O3 not only lowers its sintering temperature by ~200 C, but also improves the electrochemical performance within the intermediate temperature range of 600-800 C. Electrochemical impedance spectroscopy measurements showed that the addition of 20 wt% Bi 2O3 to LBCO exhibited the lowest area-specific resistance of 0.020 Ω cm2 at 800 C in air, which was about a seventh of that of the LBCO cathode at the same condition. At a current density of 0.2 A cm-2, the cathodic overpotential of LBCO-20Bi2O 3 was about 12.6 mV at 700 C, while the corresponding value for LBCO was 51.0 mV. Compared to B2O3-Bi2O 3-PbO frit, the addition of Bi2O3 significantly improved the long-term stability of cathode. Therefore, LBCO-20Bi 2O3 can be a promising cathode for IT-SOFCs.
KW - A. Mixing
KW - B. Microstructure
KW - C. Impedance
KW - E. Fuel cells
UR - http://www.scopus.com/inward/record.url?scp=84889088142&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2013.10.074
DO - 10.1016/j.ceramint.2013.10.074
M3 - 文章
AN - SCOPUS:84889088142
SN - 0272-8842
VL - 40
SP - 2599
EP - 2603
JO - Ceramics International
JF - Ceramics International
IS - 2
ER -