Isotope Effects of Hydrogen Ion Transport in SrCeO_3(+Y_2O_3) and its Applications

SrCeO_3(Y_2O_3)中氢离子输运的同位素效应及其应用

• 批准号: 63550490
• 负责人: FUKATSU Norihiko
• 金额: $ 1.54万
• 依托单位: Nagoya Institute of Technology, Faculty of Engineering
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63550490/
• 关键词: solid electrolyte; proton conductor; solid electrochemistry; isotope effect; heavy water; isotope separation; high temperature water electrolysis

A research on the isotope effects in transport of hydrogen through the solid electrolyte SrCe_<0.95>Yb_<0.05>O_<3-6> was performed and the following results were obtained.1. On the measurement of electrical conductivity, an isotope effect was observed in the conditions where the proton conduction is dominant. The ratio of conductivity of proton to deuteron was ROO<2> which is normal difference estimated from the theory of classical kinetics.2. The solubility of hydrogen was measured by Sieverts method. The value was found very large compared to other oxides. The isotope effect in the solubility of hydrogen was not detected.3. The chemical diffusion coefficient was obtained from the solubility measurements. The isotope effect was also not detected. It was considered that the effect was reduced by the mechanism of ambipolar diffusion with oxygen ion vacancy.4. A new mechanism of solution of hydrogen was found in the condition of low oxygen chemical potential with the measurements of thermal desorption analysis.5. The permeation of hydrogen through the thin wall of the sample with and without electrolysis was studied and its phenomena was analyzed based on the model of defects. The ratio of permeated light hydrogen to heavy one was found 1.9 without electrolysis and was found 3.5 with electrolysis. These large isotope effects are not explained from the difference of their mobilities. The difference of the speed of electrode reaction was suggested as the reason of these phenomena.The possibility of this electrolyte as the material of membrane for the separation of isotope of hydrogen was ascertained from above results.

对通过固体电解质SRCE_ <0.95> yb_ <0.05> O_ <3-6>进行氢运输的同位素效应进行了研究，并获得了以下结果。1。在测量电导率时，在质子传导占主导地位的条件下观察到同位素效应。质子与迪特隆的电导率之比为roo <2>，这是从经典动力学理论估计的正常差异。2。通过Sieverts方法测量氢的溶解度。与其他氧化物相比，该值很大。未检测到氢溶解度的同位素效应3。化学扩散系数是从溶解度测量中获得的。也未检测到同位素效应。据认为，通过氧气离子空位的双极扩散机理降低了效果。4。在低氧化学势的条件下发现了一种新的氢溶液机制，并测量了热解吸分析。5。研究了和没有电解的样品，通过样品的薄壁渗透，并根据缺陷模型分析其现象。在没有电解的情况下发现了1.9的渗透光氢与重氢之比，并通过电解3.5。这些大的同位素效应不能从它们的迁移率的差异中解释。电极反应速度的差异被认为是这些现象的原因。从上述结果中确定了该电解质作为膜分离的膜的物质。