Evaluation of perovskite oxides LnBaCo2O5+δ (Ln = La, Pr, Nd and Sm) as cathode materials for IT-SOFC
Evaluation of perovskite oxides LnBaCo2O5+δ (Ln = La, Pr, Nd and Sm) as cathode materials for IT-SOFC
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DOI：
10.1016/j.jelechem.2021.115144
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发表时间：
2021-03-21
影响因子：
4.5
通讯作者：
Jiang, Long
中科院分区：
文献类型：
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作者：
Wang, Shenglin;Zan, Jianan;Jiang, Long
系统地研究了用于中温固体氧化物燃料电池的LnBaCo2O5+6 (LnBC) （Ln = La, Pr， Nd和Sm）钙钛矿阴极的结构表征、表面状态和电化学性能。随着离子半径的减小，结构对称性逐渐扭曲。从La到Sm，随着氧空位浓度的增加，电导率降低。x射线光电子能谱分析表明，LnBC样品表面氧活性位点的浓度随着Ln3+半径的缩小而降低。增加的Ln？O键能导致热膨胀系数的减小。LnBC电极的电化学性能随着Ln3+离子半径的减小而降低。这一结果可能与
The structural characterization, surface state and electrochemical performances of LnBaCo2O5+6 (LnBC) (Ln = La, Pr, Nd and Sm) perovskite cathode are systematically investigated for intermediate-temperature solid oxide fuel cells. The structural symmetry gradually distorts with the reduced ionic radius. The electrical conductivity decreases due to the increasing oxygen vacancy concentration from La to Sm. X-ray photoelectron spectroscopy analysis indicates that the concentration of oxygen active sites on the surface of LnBC samples decreases with shrinking Ln3+ radius. The increasing Ln?O bond energy leads to the reduction of the thermal expansion coefficients. The electrochemical performance of LnBC electrode decreases with the decreasing Ln3+ ionic radius. This result may be related to the decreasing.