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2h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.
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 ℃ 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 ℃ 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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