Development of innovative reaction methodologies for high-density hydrides.

2020 Fiscal Year Final Research Report

• Project/Area Number: 19H02420
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 26020:Inorganic materials and properties-related
• Research Institution: Hokkaido University
• Principal Investigator: Fujioka Masaya 北海道大学, 電子科学研究所, 助教 (40637740)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 水素化物 / 固体電気化学 / 高圧合成 / 第一原理計算

Outline of Final Research Achievements

In this research project, "high-pressure solid-state electrochemical method", that can simultaneously adjust the three different parameters of "pressure", "temperature", and "voltage", have been developed. This method is expected to create a compound containing a large amount of hydrogen. In the perovskite oxide, hydrides were able to replace with the oxygen sites by this method, and dense bulk polycrystalline perovskite hydroxides such as BaTiO3-xHx were successfully synthesized. This BaTiO3-xHx showed about 10 to the 5th power lower electrical resistivity at room temperature than the samples obtained by the conventional method due to reduced grain-boundary resistance. In this way, it is expected that the research field of hydride synthesis will be significantly developed by making it possible to investigate the essential physical properties.

Free Research Field

無機材料合成

Academic Significance and Societal Importance of the Research Achievements

高密度に水素イオンを含有した化合物は、イオン伝導、水素吸蔵、そして超伝導に至るまで、様々な分野において従来の特性を凌駕する可能性を秘めており、高密度水素化物を創出する取り組みは、水素社会の実現やエネルギー問題の解決に関わる極めて重要な研究課題である。しかし、水素は常温常圧で透過性の高い気体であり、常圧で利用できる高密度水素化物を創出することは極めて難しい。高圧固体電気化学法は、温度、圧力、電圧を制御することで、水素を固体中に導入し、熱力学的に準安定な状態で取り出す合成手法であり、今後様々な新規機能性水素化物を創出するものと期待される。