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摘要随着能源的紧缺，燃料电池应运而生，其中固体燃料电池(SOFCS)有着很好的前景，为了实现中温化，主要研究较高催化性能的阴极材料以及其复合阴极。本文以溶胶-凝胶法制备了La0.8Sr0.2Co0.5Fe0.5O3-δ(LSCF)和Ce0.8Sm0.2O2(SDC)粉体，在致密度较高的SDC支撑片上刷上LSCF骨架，利用离子浸渍法浸渍硝酸盐溶液获得SDC纳米粒子附着的阴极。通过X射线衍射（XRD）、扫描电镜（SEM）、电化学阻抗谱和热膨胀测试等，对其相组成、微观结构、烧结性能及电化学性能进行表征。研究结果表明900℃下煅烧形成LSCF阴极骨架，采用离子浸渍技术，在900~1000℃下煅烧，在LSCF骨架上获得了SDC纳米粒子。950℃时烧结电池的激活能为68.53kJ/mol，具有较低的阻抗和能垒。在800℃时，浸渍电极的极化电阻仅为0.16Ωcm2，为同等温度下未浸渍片的77%，浸渍阴极具有更小的极化电阻。浸渍阴极的TEC为15.3×10-6 K-1，虽然比LSCF的16.2×10-6 K-1下降了，但是和SDC的12.2×10-6 K-1差距任较大，这是此类以阴极为骨架的复合阴极有待解决的问题。68272
毕业论文关键词 固体氧化物燃料电池 复合阴极 离子浸渍法
Title Research of Nanoparticle Modified LSCF cathode materials
Abstract
With the shortage of energy, fuel cells have emerged, including solid oxide fuel cells (SOFCS) has good prospects, in order to achieve the temperature of the main research higher catalytic properties of the cathode material and its composite cathodes.In this paper, the sol-gel method La0.8Sr0.2Co0.5Fe0.5O3-δ(LSCF) and Ce0.8Sm0.2O2(SDC) powders at high density on-chip brush on SDC support LSCF skeleton, use nitrate ion impregnation solution impregnation method to obtain nanoparticles adhered SDC cathode.By X-ray diffraction (XRD),scanning electron microscopy (SEM), electrochemical impedance spectroscopy and thermal expansion testing its phase composition, microstructure, sintering properties and electrochemical properties were characterized.The results show that calcined at 900 ℃ LSCF cathode frame is formed by ion-impregnation technique, in 900 ~ 1000 ℃ calcined, obtained on the LSCF skeleton SDC nanoparticles.Sintered at 950 ℃ for activation of the battery 68.53kJ/mol, with a low impedance and energy barrier.At 800 ℃, dipping electrode polarization resistance is only 0.16Ωcm2, for the same temperature for 77% of non-impregnated sheet, impregnated cathode has a smaller polarization resistance. Impregnated cathode TEC is 15.3 × 10-6 K-1, although the ratio LSCF of 16.2 × 10-6 K-1 declined, however, and the SDC 12.2 × 10-6 K-1 disparity of any larger, which is such a in the cathode composite cathodes for the skeleton to be solved.
Keywords： solid oxide fuel cell(SOFC) composite cathode Ion impregnation- method
目录
1 引言 1
1.1固体氧化物燃料电池及其工作原理 1
1.2复合阴极的分类及研究近况 4
1.3浸渍法制备阴极 7
1.4论文研究的意义 9
2 实验部分 10
2.1实验原料 10
2.2实验仪器与设备 10
2.3复合阴极制备工艺流程 11
2.4表征方法 13
3结果与讨论 15
3.1 XRD图谱分析 15
3.2微观形貌分析 17