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首页> 外文会议>International Conference on Rare Earth Research and Application; 20060625-30; Beijing(CN) >Preparation and Characterization of La_(0.8)Sr_(0.2)MnO_(3-δ) Cathode for SOFCs Fabricated Using Azeotropic Distillation Method
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Preparation and Characterization of La_(0.8)Sr_(0.2)MnO_(3-δ) Cathode for SOFCs Fabricated Using Azeotropic Distillation Method

机译：共沸蒸馏法制备SOFCs用La_（0.8）Sr_（0.2）MnO_（3-δ）阴极的制备与表征

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摘要

Strontium doped lanthanum manganite (LSM) powders were synthesized by three different routes: azeotropic 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 (R_p) are 0.35 Ω·cm~2 for the cathode synthesized by azeotropic distillation route, which is much lower than sol-gel (1.5 Ω·cm~2) and solid state reaction (2.3 Ω·cm~2) at 800 ℃.
机译：通过共沸蒸馏，溶胶-凝胶和固相反应这三种不同的途径合成了掺锶锰酸镧（LSM）粉末。共沸蒸馏和溶胶-凝胶法制备的LSM样品在1000℃下焙烧6h，固相反应法制备的LSM样品在1400℃下烧结18h。通过XRD，TEC，SEM，EIS和极化性能分析对样品进行表征。结果表明，采用不同方法制备的所有样品均具有纯正交晶的LSM相，但具有不同的微观结构和电化学特性，这与不同的合成方法有关。与共沸蒸馏和溶胶-凝胶法相比，固态反应法生产的样品粒径更大。与通过溶胶-凝胶法制备的粉末相比，通过共沸蒸馏法制备的粉末具有较少的附聚颗粒，因为前者的前体在烧结前分散在正丁醇中。共沸蒸馏法制得的粉末的极化电流密度是溶胶-凝胶法制得的极化电流密度的两倍，而固态反应法制得的极化电流密度的四倍。通过共沸蒸馏法合成的阴极的极化电阻（R_p）值为0.35Ω·cm〜2，远低于溶胶-凝胶（1.5Ω·cm〜2）和固态反应（2.3Ω·cm〜）。 2）在800℃下。

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