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Microstructure and Electrochemical Behavior of La0.8Sr0.2MnO3 Deposited by Solution Precursor Plasma Spraying
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Microstructure and Electrochemical Behavior of La0.8Sr0.2MnO3 Deposited by Solution Precursor Plasma Spraying
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National High Technology Research and Development Program of China (2007AA05Z135); National Natural Science Funds for Distinguished Young Scholar (50727101)

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    摘要:

    采用液料等离子喷涂方法 (SPPS)制备固体氧化物燃料电池多孔La0.8Sr0.2MnO3 (LSM)阴极。用SEM观察LSM的微结构,用XRD研究其相结构。考察了喷涂距离和热处理温度对LSM微结构的影响规律。结果表明,SPPS LSM 在1050 ℃热处理2 h后形成连续的具有微纳介孔结构的涂层,且LSM具有单一的钙钛矿结构。利用电化学交流阻抗谱方法研究了LSM极化行为。微结构对极化性能有显著影响,1000 ℃时,LSM在喷涂距离为60 mm时具有最佳的电化学性能,阴极极化电阻约为0.3 Ω·cm2。通过工艺的控制,SPPS可以实现SOFC阴极相和微结构的优化

    Abstract:

    Solution precursor plasma spraying (SPPS) was employed to prepare porous La0.8Sr0.2MnO3 (LSM) cathode for solid oxide fuel cell (SOFC). The surface morphology and microstructure of the LSM deposits were characterized by SEM. The phase structure of LSM was analyzed by XRD. The electrochemical behavior was investigated through the impedance spectroscopy. The effect of spray distance and annealing treatment on SPPS LSM microstructure was examined. Annealing at 1050 oC for 2 h in air, the coherent porous films of the perovskite phase with a fine microstructure were presented. The results show that the microstructure of SPPS LSM cathode exhibits a significant influence on the cathode polarization. The lowest specific surface resistance of 0.3 Ω·cm2 is obtained at 1000 oC for SPPS LSM cathode deposited at a spray distance of 60 mm. SPPS is a promising process to fabricate SOFC cathode with tailoring of the desired phase and microstructure

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王晓明,李成新,李长久,田立辉,杨冠军. Microstructure and Electrochemical Behavior of La0.8Sr0.2MnO3 Deposited by Solution Precursor Plasma Spraying[J].稀有金属材料与工程,2011,40(11):1881~1886.[Wang Xiaoming, Li Chengxin, Li Changjiu, Tian Lihui, Yang Guanjun. Microstructure and Electrochemical Behavior of La0.8Sr0.2MnO3 Deposited by Solution Precursor Plasma Spraying[J]. Rare Metal Materials and Engineering,2011,40(11):1881~1886.]
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  • 收稿日期:2010-11-11
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