纳米复合阴极的低温制备及电化学性能

摘要固体氧化物燃料电池（SOFC）是一种通过电化学过程将储存在燃料中的化学能直接转化为电能的装置。本论文以LSCF+SDC纳米结构复合阴极为研究对象，围绕下述几个部分开展研究：SDC粉体的制备、丝网印刷制备骨架、离子浸渍法制备电极以及LSCF+SDC纳米结构复合阴极的低温制备及电化学性能研究。通过X射线衍射（XRD）、扫描电镜（SEM）和电化学阻抗谱等，对其相组成、微观结构、烧结性能、极化电阻及电化学性能进行表征，研究结果表明：离子浸渍法可以获得LSCF+SDC纳米离子的多孔结构，LSCF纳米颗粒均匀分布于SDC的多孔骨架中，两者之间没有中间反应物产生。采用离子浸渍技术制备的LSCF+SDC复合阴极，在900℃温度下煅烧，均已经形成了比较单一均匀的结构。LSCF+SDC纳米结构复合阴极在工作温度为700℃时阻抗值为0.316Ωcm2，约为未浸渍电池阻抗值（0.446Ωcm2）的71%，工作温度为750℃时阻抗值为0.181Ωcm2，约为未浸渍电池阻抗值（0.263Ωcm2）的69%。复合阴极的极化电阻低于单纯的LSCF电极的极化电阻。适合做中温固体氧化物电池材料。10280
关键词固体氧化物燃料电池; 复合阴极; 离子浸渍法;
Title   Low temperature preparation and electrochemical properties of nano-structured composite cathode
Abstract
Solid oxide cells (SOFC) is an energy conversion device converting chemical energy to electrical energy. In this paper, nano-structured LSCF + SDC composite cathode is studied, Researches include the following sections: the preparation of SDC powder, preparing frame by screen printing, the preparation of electrodes by Ion impregnation and the low temperature preparation with electrochemical properties of nano-structured LSCF + SDC composite cathode. Its phase composition, microstructure, sintering properties, the polarization resistance and electrochemical properties are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and electrochemical impedance spectroscopy. The results show that: ion impregnation method can get LSCF + SDC porous structure of nano-ions. The nano-particles LSCF distributed in the porous skeleton of the SDC, there has no reactants produced between them. Once the LSCF + SDC composite cathode prepared by ion impregnation technology calcined at 900 ℃, it can form a relatively simple uniform structure. The polarization resistance of nano-structured LSCF+SDC composite cathode at 700 ℃ and 750 ℃ are 0.316Ωcm2 and 0.181Ωcm2. The polarization resistance of composite cathode is lower than pure LSCF electrode. There for, it’s suitable for intermediate temperature solid oxide battery materials.
Keywords： solid oxide fuel cell(SOFC)；composite cathode；Ion impregnation method
目   次
1 引言   1
1.1 燃料电池的阴极材料   1
1.2 复合阴极材料的反应机理   2
1.3复合阴极材料的分类   2
1.3.1传统复合阴极   2
1.3.2纳米结构复合阴极   5
1.4 电池的极化损失   6
1.4.1 欧姆极化   6
1.4.2 浓差极化   6
1.4.3 活化极化   6
1.5 论文研究的意义   7
2 实验部分   8
2.1 实验原料   8
2.2 实验仪器与设备   8
2.3复合阴极制备工艺流程   9
2.3.1溶液浸渍法   9
2.3.2制备工艺流程   9
2.4表征方法   11
2.4.1 X-射线衍射   11
2.4.2 扫描电镜   12
    2.4.3交流阻抗性能测试   12
3结果与讨论   13 纳米复合阴极的低温制备及电化学性能:http://www.youerw.com/cailiao/lunwen_9295.html