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Preparation and Protonic Conduction Characterization of SrCe0.95 Yb0.05 O3-α
Fei Jingyin, Xin Wenli, Liang Guozheng, Zhu Guangming, Ma Xiaoyan
Department ofChemical Engineering, Northwestern Polytechnical University, Xi’an 710072
Abstract:
The ytterbium doped perovskite-type strontium cerate(SrCe0.95Yb0.05O3-α)has been prepared by solid-state reactions and it’s structural and electrical characterization has been characterized using X-ray diffraction and AC impedance spectroscopy. X-ray power diffraction analysis shows that SrCe0.95Yb0.05O3-αhas a single phase of orthorhombic perovskite-type structure, and the results suggested thatYb3+substituted the position of Ce4+and formingoxygen vacancy. The electrical conductivitystudies ofSrCe0.95Yb0.05O3-αhave beenmade as a function oftemperature. Attemperature lower than 500 K, the ytterbium doped perovskite-type strontium cerate exhibits p-type conduction and the electric conduction is increasedwith increasingof temperature. However, at elevated temperatures and in hydrogen-containing atmospheres, it exhibits protonic conduction. At 800 K, the total conductivity is dominated by protonic conductivity, reaching a maximumvalue of 4.5 mS/cm. The proton migration mechanism could be proposed as“free”migration mechanism model, in which the proton moves by jumping between stationary host oxygen ions. Membranes based on dense SrCe0.95Yb0.05O3-αthin films can be expect to applied in fuel cells, chemical hydrogen pumps and hydrogen sensors.
Key words:  Protonic conductor, Solid electrolyte, Perovskite
FundProject:
SrCe0.95 Yb0.05 O3-α的制备及其质子导电特性
费敬银*, 辛文利*, 梁国正, 朱光明, 马晓燕
西北工业大学化工系,西安,710072
摘要:
利用固相反应法制备出固态质子导体SrCe0.95Yb0.05O3-α,并使用X射线衍射分析法及低频阻抗测量法对其电子结构和导电特性进行了研究.X射线分析结果表明,该物质为钙钛矿晶体结构,具有p型电子空穴和氧离子空穴.在低温下主要为电子导电,且电子导电率随温度的升高而增大.在含氢气环境中,当温度高于550 K时, SrCe0.95Yb0.05O3-α具有明显的质子导电性,随着温度的升高,质子导电性增强.当温度高于800 K时,质子是导体中的主要载流子,质子电导率可达4.5 mS/cm.
关键词:  质子导体  固体电解质  钙钛矿
DOI:10.1088/1674-0068/16/5/425-428
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