A位缺陷及B位掺杂对La掺杂的SrTiO3固体氧化物燃料电池阳极材料性能的影响机理

项目名称： A位缺陷及B位掺杂对La掺杂的SrTiO3固体氧化物燃料电池阳极材料性能的影响机理

项目编号： No.51302033

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 一般工业技术

项目作者： 陈刚

作者单位： 东北大学

项目金额： 25万元

中文摘要： La掺杂的SrTiO3(LST)固体氧化物燃料电池阳极材料由于其较高的电子电导率、良好的氧化还原稳定性、和电解质材料间相近的热膨胀系数和良好的抗硫中毒等优点，近年来受到广泛研究。而低氧离子电导率﹑较差的催化活性﹑和锆基电解质之间的界面反应等问题使得LST阳极的发电性能还比较差。为解决以上问题，本课题提出通过在La和Sr所在的A位引入缺陷的方式来降低LST中La的反应活性，抑制界面反应发生；通过在Ti所在的B位掺杂低价或变价金属，使材料结构中产生氧空位，来增加材料的氧离子电导率；另外，在B位掺杂高催化活性的金属也有可能会提高LST阳极材料在燃料中的催化活性。与此同时，在A位引入缺陷和对B位进行掺杂是否会对LST其他电化学特性产生影响也需要深入研究。因此，本课题的主要目的就是弄清楚A位缺陷和B位掺杂分别和同时对LST材料一系列特性的影响机理，找出各方面特性都最优异的LST阳极材料。

中文关键词： 固体氧化物燃料电池；阳极；La掺杂SrTiO3；A位缺陷；B位掺杂

英文摘要： La-substituted SrTiO3 (LST) has attracted more and more attention as one of potential anode material for solid oxide fuel cell (SOFC) because of its high electrical conductivity, match thermal expansion to zirconia electrolyte,good sulfur resistance and good chemical and physical stability under oxidation and reduction atmosphere respectively. However,the cell with LST anode still shows very poor electrochemical performance due to the low oxygen ionic conductivity and poor catalytic activity of LST and the interfacial reaction between LST anode and zirconia electrolyte(formation of La2Zr2O7).In this subject, introducing deficientcy in A-site of LST is expected to reduce the reactivity of La in LST and eventually suppress the interfacial reaction between LST anode and zirconia electrolyte. Doping in the Ti site of LST with some low valence metal is expected to improve the ionic conductivity of LST .On the other hand,the dopant in B-site with high catalytic activity also has possibility to improve the catalytic of LST.In addition,it is necessary to clarify if the A-site deficiency and B-site doping have effect on other characteristies of LST anode material.Thus,the main purpose of this subject is to clarify the effect mechanism of A site deficiency and B site doping on the electrochemical performance of LST anode

英文关键词： Solid oxide fuel cell；Anode；La substituted SrTiO3；A-site deficient；B-site doping