| Ba1.03Ce0.8Dy0.2O3-α固体电解质的合成及其离子导电性 |
| Preparation of Ba1.03Ce0.8Dy0.2O3-α Solid Electrolyte and its Ionic Conductivity |
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| 摘要: 用高温固相反应法首次合成了非化学计量组成的Ba1.03Ce0.8Dy0.2O3-α固体电解质样品,对其进行了X-射线衍射晶体结构测定,该样品为钙钛矿型斜方晶单相结构。分别用气体浓差电池方法和氢泵(氢的电化学透过)方法研究了它在600～1000℃下的质子和氧离子导电特性,并与化学计量组成的BaCe0.8Dy0.2O3-α固体电解质样品进行了比较。实验结果表明,Ba1.03Ce0.8Dy0.2O3-α的质子导电性优于BaCe0.8Dy0.2O3-α。Ba1.03Ce0.8Dy0.2O3-α在600～1000℃下氢气氛中的质子迁移数约为1,几乎是一个纯质子导体,而BaCe0.8Dy0.2O3-α在氢气氛中600～800℃下是一个纯质子导体,在高于800℃时是一个质子与电子的混合导体。这两个样品在氧气氛中均是氧离子与电子空穴的混合导体,具有几乎相同的氧离子迁移数。 |
| 关键词: Ba1.03Ce0.8Dy0.2O3-α BaCe0.8Dy0.2O3-α 铈酸钡 气体浓差电池 非化学计量性 |
| 基金项目: |
| Abstract: Ba1.03Ce0.8Dy0.2O3-α solid electrolyte with nonstoichiometric composition has been synthesized for the first time by high temperature solid-state reaction. The crystal structure was determined by X-ray diffraction. The sample was a single-phase structure of perovskite-type orthorhombic system. Its conduction properties of proton and oxide-ion were investigated in the temperature range of 600～1000℃ by means of gas concentration cells and hydrogen pumping (electrochemical hydrogen permeation), respectively, and compared them with those of the stoichiometric composition of BaCe0.8Dy0.2O3-α solid electrolyte. The experimental results indicate that Ba1.03Ce0.8Dy0.2O3-α is superior to BaCe0.8Dy0.2O3-α in the protonic conduction. Ba1.03Ce0.8Dy0.2O3-α is almost a pure proton conductor (proton transport number is about equal 1) over the temperature range of 600～1000℃, whereas BaCe0.8Dy0.2O3-α is a pure proton conductor at 600～800℃, however, it becomes a mixed conductor of proton and electron above 800℃ under hydrogen atmosphere. Both the samples are all a mixed conductor of oxide-ion and electron hole with an almost same oxide-ionic transport number under oxygen atmosphere. |
| Keywords: Ba1.03Ce0.8Dy0.2O3-α BaCe0.8Dy0.2O3-α BaCeO3 gas concentration cell nonstoichiometry |
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| 陈蓉,马桂林,李宝宗.Ba1.03Ce0.8Dy0.2O3-α固体电解质的合成及其离子导电性[J].无机化学学报,2002,18(12):1200-1204. |
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