Synthesis and assessment of La0.8Sr0.2ScyMn1−yO3−δ as cathodes for solid-oxide fuel cells on scandium-stabilized zirconia electrolyte
Synthesis and assessment of La0.8Sr0.2ScyMn1−yO3−δ as cathodes for solid-oxide fuel cells on scandium-stabilized zirconia electrolyte
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DOI：
10.1016/j.jpowsour.2008.05.053
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发表时间：
2008-09
影响因子：
9.2
通讯作者：
Hongxia Gu;Yao Zheng;R. Ran;Zongping Shao;W. Jin;N. Xu;J. Ahn
中科院分区：
文献类型：
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作者：
Hongxia Gu;Yao Zheng;R. Ran;Zongping Shao;W. Jin;N. Xu;J. Ahn
合成了钙钛矿型La0.8Sr0.2ScyMn1− yO 3 −δ氧化物（LSSMy，y=0.0-0.2），并将其用作含有稳定氧化锆电解质的固体氧化物燃料电池（SOFC）的阴极。在La0.8Sr0.2MnO3−δ（LSM）的B位引入Sc 3+导致氧化物的热膨胀系数和电导率降低。在所测试的各种LSSMy氧化物中，LSSM0.05具有最小的面积比阴极极化电阻，这是由于Sc 3+对表面SrO偏析的抑制作用和表面氧空位浓度的优化。在850°C下，400 mAcm − 2电流通过30 min后，其电阻仅为0.094Ω cm 2，明显低于LSM的电阻（0.25Ω cm 2）。使用LSSM 0.05阴极的阳极支撑电池在850°C时的峰值功率密度为1300 mWcm − 2。在相同条件下，具有LSM阴极的电池的相应值为450 mWcm − 2。LSSM 0.05氧化物可能是一种很好的阴极材料，用于含有掺杂氧化锆电解质的IT-SOFC。
Perovskite-type La0.8Sr0.2ScyMn1−yO3−δoxides (LSSMy, y=0.0–0.2) were synthesized and investigated as cathodes for solid-oxide fuel cells (SOFCs) containing a stabilized zirconia electrolyte. The introduction of Sc3+into the B-site of La0.8Sr0.2MnO3−δ(LSM) led to a decrease in the oxides’ thermal expansion coefficients and electrical conductivities. Among the various LSSMy oxides tested, LSSM0.05 possessed the smallest area-specific cathodic polarization resistance, as a result of the suppressive effect of Sc3+on surface SrO segregation and the optimization of the concentration of surface oxygen vacancies. At 850°C, it was only ∼0.094Ωcm2after a current passage of 400mAcm−2for 30min, significantly lower than that of LSM (∼0.25Ωcm2). An anode-supported cell with a LSSM0.05 cathode demonstrated a peak power density of 1300mWcm−2at 850°C. The corresponding value for the cell with LSM cathode was 450mWcm−2under the same conditions. The LSSM0.05 oxide may potentially be a good cathode material for IT-SOFCs containing doped zirconia electrolytes.