高等学校化学学报 ›› 2001, Vol. 22 ›› Issue (8): 1283.

• 研究论文 • 上一篇    下一篇

PrGa1-xMgxO3作为燃料电池固体电解质的研究

刘志国1, 黄喜强1, 刘巍1, 吕纪喆1, 裴力1, 贺天民1, 苏文辉1   

  1. 1. 吉林大学物理系, 吉林大学无机合成与制备化学国家重点实验室, 长春 130023;
    2. 中国科学院国际材料物理中心, 沈阳 110015
  • 收稿日期:2000-06-27 出版日期:2001-08-24 发布日期:2001-08-24
  • 通讯作者: 苏文辉(1936年出生),男,教授,博士生导师,从事稀土固态科学和无机高压合成研究.
  • 基金资助:

    国家计划委员会和吉林省计划委员会重点攻关项目(批准号:85-715-21-02

A Study of PrGa1-xMgxO3 as the Electrolytes of SOFCs

LIU Zhi-Guo1, HUANG Xi-Qiang1, LIU Wei1, Lü Zhe-JI1, Yuan-PEI Li1, HE Tian-Min1, SU Wen-Hui1   

  1. 1. Department of Chemical Engineering, Department of Chemistry, Northwest University, Xi'an 710069, China;
    2. International Center for Mater ials Physics, Academia Sinica, Shenyang 110015, China
  • Received:2000-06-27 Online:2001-08-24 Published:2001-08-24

摘要: 用固相反应法合成了具有正交钙钛矿结构的PrGa1-xMgxO3(x=0,0.05,0.10,0.15,0.20,0.25).通过掺杂,样品的电导率显著提高,活化能降低.所有样品均以离子导电为主,其中PrGa0.9Mg0.1O3的氧离子电导率最高,在800℃达到0.05S/cm,PrGa0.8Mg0.2O3的导电活化能最低,为24.19kJ/mol.随着温度的升高,样品的离子迁移数增加.PrGa0.9Mg0.1O3作为电解质的燃料电池在940℃短路电流密度为0.45A/cm2,最大功率密度达0.131W/cm2,镁掺杂的PrGaO3是一种性能优良的固体电解质.

关键词: PrGaO3, 固体电解质, 氧离子电导, 固体氧化物燃料电池(SOFC)

Abstract: PrGa1-x Mgx O3( x=0, 0.05, 0.10, 0.15, 0.20, 0.25) were synthesized by using a standard solid state technology. XRDresults show that all samples are orthorhombic. Mg-doping increases the oxygen ion conductivity and decreases the activation energy of the samples significantly. The conductivity of the samples is mainly ionic. PrGa0.9 Mg0.1 O3 has the highest conductivity of 0.05 S/cm at 800 ℃, while PrGa0.8 Mg0.2 O3 has the lowest activation energy of 24.19 kJ/moLIn all the samples. The oxygen ion transport number of the samples increases with increasing temperature. SOFCs results show that PrGa0.9 Mg0.1 O3 has the best properties, for which the power density of 0.131 W/cm2 and the short circuit current density of 0.45 A/cm2 were achieved at 940 ℃. This study reveals that Mg doped PrGaO3 is a kind of solid electrolyte with superior properties.

Key words: PrGaO3, Solid electrolyte, Oxygen ion conductivity, Solid oxide fuel cell

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