Formation mechanism of porous metals by liquid metal dealloying

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K05126
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 26040:Structural materials and functional materials-related
• Research Institution: Tohoku University
• Principal Investigator: Wada Takeshi 東北大学, 金属材料研究所, 准教授 (10431602)
• Co-Investigator(Kenkyū-buntansha): 奥川 将行 大阪大学, 大学院工学研究科, 助教 (70847160) ; 加藤 秀実 東北大学, 金属材料研究所, 教授 (80323096)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: ポーラス金属 / 金属液体 / 脱成分 / 触媒

Outline of Final Research Achievements

In order to improve the functional properties of porous metals, it is important to control the pore/ligament size and volume fraction of the porous metals. In this study, we investigated a relationship between the processing parameters of liquid metal dealloying and the structure of the resulting porous metals. Experiments and simulations revealed that the presence of a component in the metal bath that interacts significantly with the ligament component promotes the coarsening of the porous structure. It was also found that by designing the intermetallic ligaments, the coarsening of the porous structure can be significantly suppressed and porous metals with very high specific surface area can be fabricated.

Free Research Field

金属工学

Academic Significance and Societal Importance of the Research Achievements

本研究によって金属溶湯脱成分技術においてポーラス金属が生成・粗大化するメカニズムをより詳細に理解することができた。その結果に基づいて金属間化合物を利用した新しい粗大化抑制手法を開発した。本成果は比表面積が大きなポーラス金属を作製するための重要な知見であり、卓越した性能を示す蓄電池電極や触媒を開発に結びつくことが期待される。