Preparation and Characterization of La_(0.8)Sr_(0.2)MnO_(3-δ) Cathode for SOFCs Fabricated Using Azeotropic Distillation Method  

作　　者：朴金花 孙克宁 张乃庆 徐莘 周德瑞 

机构地区：[1]Department of Applied Chemistry,Harbin Institute of Technology [2]Research Station on Material Science and Engineering for Postoral Fellows,Harbin Institute of Technology,Harbin 150001,China

出　　处：《Journal of Rare Earths》2006年第z2期93-97,共5页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (90510006)

摘　　要：Strontium doped lanthanum manganite (LSM) powders were synthesized by three different routes: azeotropie distillation, sol-gel and solid state reaction respectively. The LSM samples, made by azeotropic distillation and sol-gel methods were prepared by firing at 1000℃for 6 h, and the LSM sample, made by solid state reaction method was produced by sintering at 1400℃for 18 h. The samples were characterized by XRD, TEC, SEM, EIS and polarization performance analysis. The results show that all the samples made by different methods have pure orthorhombic LSM phase, however exhibit different micro structure and electrochemical characterization, which relates to the different synthesis methods. The solid state reaction method produces the samples with larger particle size compared with azeotropic distillation and sol-gel methods. The powders made by azeotropic distillation method have less agglomerated particles compared with that made by sol-gel method because the precursor in the former is dispersed in n-butanol before sintering. The polarization current density of powder made by azeotropic distillation method was twice of that made by sol-gel method and four times of that made by solid state reaction method. The values of polarization resistance (Rp) are 0.35Ω·cm for the cathode synthesized by azeotropic distillation route, which is much lower than sol-gel (1.5Ω·cm2) and solid state reaction (2.3Ω·cm2) at 800℃.Strontium doped lanthanum manganite (LSM) powders were synthesized by three different routes: azeotropie distillation, sol-gel and solid state reaction respectively. The LSM samples, made by azeotropic distillation and sol-gel methods were prepared by firing at 1000℃for 6 h, and the LSM sample, made by solid state reaction method was produced by sintering at 1400℃for 18 h. The samples were characterized by XRD, TEC, SEM, EIS and polarization performance analysis. The results show that all the samples made by different methods have pure orthorhombic LSM phase, however exhibit different micro structure and electrochemical characterization, which relates to the different synthesis methods. The solid state reaction method produces the samples with larger particle size compared with azeotropic distillation and sol-gel methods. The powders made by azeotropic distillation method have less agglomerated particles compared with that made by sol-gel method because the precursor in the former is dispersed in n-butanol before sintering. The polarization current density of powder made by azeotropic distillation method was twice of that made by sol-gel method and four times of that made by solid state reaction method. The values of polarization resistance (Rp) are 0.35Ω·cm for the cathode synthesized by azeotropic distillation route, which is much lower than sol-gel (1.5Ω·cm2) and solid state reaction (2.3Ω·cm2) at 800℃.

关 键 词：CATHODE azeotropic distillation solid oxide fuel cell rare earths 

分 类 号：TM911.4[电气工程—电力电子与电力传动]