Studies of Hydrogen-pumping Function of Proton-conducting Ceramics and Their Applications

质子传导陶瓷的抽氢功能研究及其应用

• 批准号: 10305048
• 负责人: IWAHARA Hiroyasu
• 金额: $ 23.04万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A).
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10305048/
• 关键词: Proton-conducting ceramics; Hydrogen pump; Hydrogen pressure regulator; Electrochemical dehumidifier; hydrogen sensor; Electrode reaction; Denitration equipment; Hydrogen industry; プロトン; セラミックス; 水素ガス電極; 薄膜; プロトンの移動度; 分極

The objectives of this study are to clarify the function of electrochemical hydrogen pump of proton-conducting ceramics and to establish the guiding principles for applying the hydrogen pump to industrial process and scientific instruments. Also, the creation of new proton conducting ceramics suitable for the hydrogen pump is one of the aims of our study.Hydrogen gas electrode reaction and the electrode behavior of anode and cathode of the hydrogen pump using a proton-conducting ceramic were investigated in detail from the experimental results. The microstructure of electrode material, the content of water vapor and the operation temperature that would enable to enhance the pumping capacity could be clarified in this work. Based on these results, we succeeded in constructing a high performance hydrogen pump which could electrochemically pump the hydrogen gas at higher current density than 1Acm^<-2>.Combining the hydrogen-pumping function with the hydrogen-sensing function of proton-conducting ceramic, the regulator of hydrogen partial pressure in the gas mixture was devised and it was confirmed to work well. Hydrogen pumps were successfully applied to an electrochemical dehumidifier for closed vessels and the hydrogen sensors which need no hydrogen standard material. This kind of a pump showed the possibility of applying to denitration equipment for exhaust gas from internal combustion engines.Furthermore, several kinds of proton-conducting solid oxide based on Sr_2YTaO_6, LaSrAlO_4, La_<5.8>WO_<11.7>, La_3NbO_7, LaScO_3, SrZrO_3 etc.were newly synthesized.

本研究的目的是阐明质子传导陶瓷电化学氢泵的功能，并建立氢泵在工业过程和科学仪器中应用的指导原则。此外，创造适用于氢泵的新型质子传导陶瓷也是我们研究的目标之一。使用质子传导陶瓷对氢气电极反应以及氢泵阳极和阴极的电极行为进行了详细研究实验结果。这项工作可以阐明电极材料的微观结构、水蒸气的含量和能够提高泵送能力的操作温度。基于这些结果，我们成功构建了一种高性能氢泵，它可以在高于1Acm^<-2>的电流密度下电化学泵送氢气。将氢泵送功能与质子传导陶瓷的氢传感功能相结合设计了气体混合物中氢气分压的调节器，并证实其效果良好。氢气泵成功应用于密闭容器电化学除湿器和无需氢标准材料的氢气传感器。该泵展示了应用于内燃机废气脱硝设备的可能性。此外，还研究了几种基于Sr_2YTaO_6、LaSrAlO_4、La_<5.8>WO_<11.7>、La_3NbO_7、LaScO_3、新合成了SrZrO_3等。