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Improved high temperature performance of La 0.8Sr 0.2MnO 3 cathode by addition of CeO 2

Improved high temperature performance of La 0.8Sr 0.2MnO 3 cathode by addition of CeO 2,10.1016/j.jpowsour.2011.03.102,Lancet,J. P. Wiff,K. Jono,M. Su

Improved high temperature performance of La 0.8Sr 0.2MnO 3 cathode by addition of CeO 2  
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Ceria is proposed as an additive for La0.8Sr0.2MnO3 (LSM) cathodes in order to increase both their thermal stability and electrochemical properties after co-sintering with an yttria-stabilized zirconia (YSZ) electrolyte at 1350°C. Results show that LSM without CeO2 addition is unstable at 1350°C, whereas the thermal stability of LSM is drastically improved after addition of CeO2. In addition, results show a correlation between CeO2 addition and the maximum power density obtained in 300μm thick electrolyte-supported single cells in which the anode and modified cathode have been co-sintered at 1350°C. Single cells with cathodes not containing CeO2 produce only 7mWcm−2 at 800°C, whereas the power density increases to 117mWcm−2 for a CeO2 addition of 12mol%. Preliminary results suggest that CeO2 could increase the power density by at least two mechanisms: (1) incorporation of cerium into the LSM crystal structure, and (2) by modification or reduction of La2Zr2O7 formation at high temperature. This approach permits the highest LSM–YSZ co-sintering temperature so far reported, providing power densities of hundreds of mWcm−2 without the need for a buffer layer between the LSM cathode and YSZ electrolyte. Therefore, this method simplifies the co-sintering of SOFC cells at high temperature and improves their electrochemical performance.
Journal: Lancet , vol. 196, no. 15, pp. 6196-6200, 2011
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