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Hydrogen Absorption and Desorption Characteristics of Proton Conductor Litium Compounds

质子导体锂化合物的吸放氢特性

基本信息

批准号：
05680432
负责人：
YAMANAKA Shinsuke
金额：
$ 1.34万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

项目摘要

Hydrogen behavior in oxides is closely related to research and development of engineering materials such as fission and fusion reactor materials, high-corrosion resistance materials and fuel cell materials. There is limited information about hydrogen behavior in oxides. In the present study, Li_2O,Li_2ZrO_3 and SrCe_<0.95>Yb_<0.05>O_3 have been selected as candidates of proton conductors, and the hydrogen absorption and desorption behavior were examined. The electrical conductivities of Li_2O and Li_2ZrO_3 were measured in vacuum, oxygen and in O_2/H_2O atmospheres (P_<H20> of 0,100Pa, 400Pa and 872Pa) in the temperature range of 300-1000ﾟC by a impedance spectroscopy. The temperature dependence of conductivity multiplied by temperature (sigmaT) followed the relation sigmaT=Aexp (-E/RT). These results indicate that both samples are ionic conductors. The conductivities increased with increasing water vapor pressure in the oxygen atmosphere. The activation energies of conductivities of Li_2O and Li_2ZrO_3 were 64-68 kJ/mol and 97-101 kJ/mol, respectively. The hydrogen dissolution behavior of Li_2O and SrSrCe_<0.95>Yb_<0,05>O_3 was measured in the O_2/H_2O atmosphere by thermal desorption method. The hydrogen solubility was found to decrease with the temperatrue and to increase with the water vapor pressure. The equilibria between the atmosphere and oxides was discussed in terms of thermochemical reaction.

氢在氧化物中的行为与裂变与聚变反应堆材料、高耐腐蚀材料、燃料电池材料等工程材料的研究和开发密切相关。关于氢在氧化物中的行为的信息有限。本论文选择Li_2O，Li_2ZrO_3和SrCe_<0.95>Yb_<0.05>O_3作为质子导体的候选材料，研究了它们的吸放氢行为。用交流阻抗法测量了Li_2O和Li_2ZrO_3在真空、氧气和O_2/H_2O气氛（P_<H20>（0，100，400，872）Pa）中300-1000 ℃温度范围内的电导率。电导率乘以温度（σ T）的温度依赖性遵循关系式σ T =Aexp（-E/RT）。这些结果表明，两种样品都是离子导体。在氧气气氛中，电导率随着水蒸气压的增加而增加。Li_2O和Li_2ZrO_3的电导率活化能分别为64-68 kJ/mol和97-101 kJ/mol。用<0.95>热脱附法研究了Li_2O和SrSrCe_ Yb_（0，05）O_3在O_2/H_2O气氛中的氢溶解行为。氢的溶解度随温度的升高而减小，随水蒸气压的升高而增大。从热化学反应的角度讨论了气氛与氧化物之间的平衡。