Development of Ultra High-Temperature Oxide Proton Conductive Solid Electrolyte

超高温氧化物质子导电固体电解质的研制

基本信息

批准号：
09450278
负责人：
FUKATSU Norihiko
金额：
$ 8.7万
依托单位：
Nagoya Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09450278/
关键词：
alumina hydrogen solubility proton conduction solid electrolyte IR absorption isotope effect hydrogen sensor electrical conductivity 酸化物スピネルプロトン電導

项目摘要

The defect structure of the conventional proton conductor CaZrO3(+In) in the high temperature region was studied in detail at first. According to the results, a new method to compensate the effect of the oxide ion conduction, which become remarkable in higher temperature range, was developed. The prototype hydrogen sensor system designed adopting this method was made and tested in the laboratory and the practical plant. The high performance of the system as the monitoring tool for the metal melting process was confirmed.In order to find the proton conductor usable in higher temperatures, the behavior of hydrogen in the single crystal of magnesium aluminate spinel was studied. From the existence of OH stretching vibration observed in the IR absorption spectrum, the dissolution of hydrogen into the alumina-rich spinel as the type of proton was ascertained. The chemical diffusion coefficient of hydrogen determined from the dissolution rate was found far smaller than those of conventional … More perobskite-type proton conductors. As the H/D isotope effect in the electrical conductivity was not observed, it was confirmed that the contribution of the movement of the dissolved proton to the electrical conduction was very small.From the consideration on the curious phenomena observed concerning the extra high hydrogen solubility of molten aluminum, the possibility of alumina-base proton.conductor was suggested. Therefore, the hydrogen dissolution into the single crystal of Mg-doped alpha alumina was studied extensively. From the result of IR absorption, hydrogen was confirmed to dissolve as a movable proton. A clear H/D isotope effect was observed in the electrical conductivity measurement. And the predominancy of the proton conduction was ascertained. Using Mg doped sintered polycrystalline alumina, the proton transport number was determined by EMF method. The determined value in hydrogen atmosphere was more than 0.5 even at the temperature l473K.It was found that Mg-doped alpha alumina was the best material as a proton conducting solid electrolyte for high temperature use. The performance of the hydrogen sensor using this electrolyte was also tested and good results were obtained. Less

首先研究了高温区域中常规质子导体Cazro3（+in）的缺陷结构。根据结果，开发了一种补偿氧化离子传导效果的新方法，在较高的温度范围内变得显着。设计采用此方法的原型氢传感器系统在实验室和实用工厂中进行了测试。确认了系统作为金属熔化过程的监测工具的高性能。为了找到在较高温度下可用的质子导体，研究了氢在铝氧化铝蜘蛛三镁单晶中的行为。从在IR抽象谱中观察到的OH拉伸振动的存在中，由于确定了质子的类型，氢溶解到富含氧化铝的尖晶石中。发现从溶解速率确定的氢的化学扩散系数远小于常规的……更多的perobskite型质子导体。由于未观察到H/D同位素在电导率中的同位素效应，因此可以证实，溶解质子对电导的运动的贡献很小。从观察到的关于熔融铝的高氢溶解度的考虑因素，这些铝的高氢溶解度，是铝碱基碱基质子蛋白质的可能性。因此，对氢氧化铝氧化铝的单晶溶体进行了广泛的研究。从IR滥用的结果中，确认氢可以溶解为可移动质子。在电导率测量中观察到明显的H/D同位素效应。并确定了质子传导的主要率。使用MG掺杂的烧结多晶氧化铝，通过EMF方法确定质子的传输数。即使在温度为L473K的温度下，氢气大气中确定的值也超过0.5。它发现MG掺杂的α氧化铝是最佳材料，作为用于高温使用的固体电解质的质子。还测试了使用该电解质的氢传感器的性能，并获得了良好的结果。较少的