摘要
为了提高质子-电子混合导电膜的电子导电性,采用浸渍法对SrCe0.9Y0.1O3-δ粉体进行Pt修饰,制备出含Pt的SrCe0.9Y0.1O3-δ质子导电膜(Pt/SCY膜),并对其致密性、物相、微结构、电子导电性进行了研究。研究结果表明,在1450℃保温3h,得到的Pt含量≤0.2%(质量分数)的Pt/SCY膜具有正交钙钛矿结构,且相对密度达98%。当保温时间延长或Pt掺入量增加时,Pt/SCY膜中出现SrY2O4和Y2O3相。Pt/SCY膜在H2还原前后具有不同的微观结构,通过对膜在空气中的交流阻抗谱测试,发现Pt修饰改变了400℃以下电子的传导机制,显著地提高了低温区电子导电率。
SrCe0.9Y0.1O3-δ membranes containing Pt （Pt/SCY membranes） were prepared from SrCe0.9Y0.1O3-δ powder impregnated with H2PtC16 solution, in order to improve the electronic conductivity of the membranes. The density, phase, microstructure and electronic conductivity of Pt/SCY membranes were investigated. The results indicate that Pt/SCY membranes containing≤0.2wt% Pt, sintered at 1450℃ for 3h, have a perovskite structure, and the relative density of these membranes reaches 98 %. When Pt/SCY membranes were sintered at 1450℃ for longer period or impregnated with higher amount of Pt, SrY2O4 and Y2O3 phases appeared in the membranes. The microstructure of Pt/SCY membrane reduced in H2 is different from that not reduced in H2. It is found that the electronic conducting mechanism of SrCe0.9 Y0.1O3-δ membranes below 400℃ is changed by Pt modification, and the electronic conductivity increases obviously at low temperatures.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2007年第2期217-220,共4页
Journal of Functional Materials
基金
国家自然科学基金资助项目(50272007)
