Structural and electrochemical properties of B-site Mg-doped La0.7Sr0.3MnO3−δ perovskite cathodes for intermediate temperature solid oxide fuel cells
Structural and electrochemical properties of B-site Mg-doped La0.7Sr0.3MnO3−δ perovskite cathodes for intermediate temperature solid oxide fuel cells
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DOI：
10.1016/j.jallcom.2015.09.136
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发表时间：
2016-01
影响因子：
6.2
通讯作者：
L. Gan;Q. Zhong;Xiaolu Zhao;Yang Song;Yunfei Bu
中科院分区：
文献类型：
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作者：
L. Gan;Q. Zhong;Xiaolu Zhao;Yang Song;Yunfei Bu
采用edta -柠檬酸复合络合法制备了一系列b位掺杂mg的La0.7Sr0.3Mn3−δ(LSMM,x= 0,0.1, 0.2)系钙钛矿正极材料。研究了在la0.7 sr0.3 mno3的mn位上引入Mg对样品结构特征和电化学性能的影响。在所有样品中，la0.7 sr0.3 mn0.8 mg0.3 2o3−δ(LSMM20)表现出较大的BET表面积（8.72 m2/g），在50-900℃范围内热膨胀系数较低，为~ 10.6 × 10−6K−1，氧空位浓度较高。LSMM20具有良好的电化学性能，具有较低的极化电阻（Rp），在800°C时，电解质负载的单电池的最大功率密度为187 mW cm−2。该研究表明LSMM20具有作为it - sofc正极候选材料的潜力。
A series of La0.7Sr0.3Mn3−δ(LSM)-based perovskite cathode material with B-site Mg-doped composition La0.7Sr0.3Mn1−xMgxO3−δ(LSMM,x= 0, 0.1, 0.2) was successfully synthesized by a combined EDTA-citrate complexing method. The effect of the introduction of Mg into the Mn-site of La0.7Sr0.3MnO3on the structural characteristics and electrochemical properties of the samples was specifically investigated. Among all the samples, La0.7Sr0.3Mn0.8Mg0.2O3−δ(LSMM20) showed larger BET surface areas (8.72 m2/g), a lower thermal expansion coefficient of ∼10.6 × 10−6K−1in a temperature range of 50–900 °C and a higher oxygen vacancy concentration. The good electrochemical performance of LSMM20 was manifested from its lower polarization resistance (Rp), resulting in a maximum power density of 187 mW cm−2for an electrolyte supported single cell at 800 °C. This study indicates the potential of LSMM20 as a cathode candidate material for IT-SOFCs.