| Ba0.9La0.1Ce0.9Nd0.1O3-α陶瓷的离子导电性 |
| Ionic Conduction in Ba0.9La0.1Ce0.9Nd0.1O3-α Ceramic |
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| 摘要: 用高温固相反应法制备了Ba0.9La0.1Ce0.9Nd0.1O3-α质子导电性陶瓷, 粉末X-射线衍射(XRD)分析表明, 该陶瓷为单一钙钛矿型斜方晶结构。在500~900℃温度范围内, 分别用气体浓差电池方法和交流阻抗谱技术研究了材料在不同气体气氛中的离子导电性, 并与Ba0.9Ca0.1Ce0.9Nd0.1O3-α材料的离子导电性进行了比较。结果表明, 在500~900℃温度范围内、湿润氢气中, Ba0.9La0.1Ce0.9Nd0.1O3-α材料的质子迁移数为1, 是一个纯的质子导体。在干燥空气中, 该材料是一个氧离子和电子空穴的混合导体, 氧离子迁移数为0.295~0.081, 氧离子电导率高于Ba0.9Ca0.1Ce0.9Nd0.1O3-α。在湿润空气中, 该材料是一个质子、氧离子和电子空穴的混合导体, 质子迁移数为0.151~0.009, 氧离子迁移数为0.300~0.107, 质子电导率低于Ba0.9Ca0.1Ce0.9Nd0.1O3-α材料。在氢-空气燃料电池条件下, Ba0.9La0.1Ce0.9Nd0.1O3-α材料是一个质子、氧离子和电子的混合导体, 离子迁移数为0.964~0.853, 离子电导率与Ba0.9Ca0.1Ce0.9Nd0.1O3-α材料相近。 |
| 关键词: Ba0.9La0.1Ce0.9Nd0.1O3-α 气体浓差电池 阻抗谱 离子导电性 |
| 基金项目: 江苏省高校“青蓝工程”和江苏省高校自然科学基金(No.07KJB150126)资助项目。 |
| Abstract: Proton-conducting Ba0.9La0.1Ce0.9Nd0.1O3-α ceramic was prepared by high temperature solid-state reaction. X-ray powder diffraction pattern (XRD) shows that the material is of a single orthorhombic phase of perovskite-type BaCeO3. Ionic conduction in the material under different gas atmospheres was studied by using gas concentration cell and ac impendence spectroscopy methods in the temperature range of 500~900℃, respectively, and compared with that of Ba0.9Ca0.1Ce0.9Nd0.1O3-α. The results indicate that Ba0.9La0.1Ce0.9Nd0.1O3-α is a pure protonic conductor with the protonic transport number of 1 in wet hydrogen in the range 500~900℃. In dry air, Ba0.9La0.1Ce0.9Nd0.1O3-α is a mixed conductor of oxide ion and electronic hole. The oxide ionic transport numbers are 0.295~0.081. The oxide ionic conductivity of the material is higher than that of Ba0.9Ca0.1Ce0.9Nd0.1O3-α. In wet air, Ba0.9La0.1Ce0.9Nd0.1O3-α is a mixed conductor of proton, oxide ion and electronic hole. The protonic transport numbers are 0.151~0.009, and the oxide ionic transport numbers are 0.300~0.107. The protonic conductivity of the material is lower than that of Ba0.9Ca0.1Ce0.9Nd0.1O3-α. In hydrogen-air fuel cell, Ba0.9La0.1Ce0.9Nd0.1O3-α is a mixed conductor of proton, oxide ion and electron. The ionic transport numbers are 0.964~0.853. The ionic conductivity of the material is close to that of Ba0.9Ca0.1Ce0.9Nd0.1O3-α. |
| Keywords: Ba0.9La0.1Ce0.9Nd0.1O3-α gas concentration cell ac impedance ionic conduction |
| 投稿时间：2012-10-20 修订日期：2012-11-19 |
| 摘要点击次数: 1639 |
| 全文下载次数: 1895 |
| 仇立干,王茂元,孙玉凤.Ba0.9La0.1Ce0.9Nd0.1O3-α陶瓷的离子导电性[J].无机化学学报,2013,29(4):838-844. |
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