Investigation of microstructure evolution during hydrogenation/dehydrogenation

2014 Fiscal Year Final Research Report

• Project/Area Number: 24560853
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Structural/Functional materials
• Research Institution: Kyushu University
• Principal Investigator: MATSUDA Junko 九州大学, カーボンニュートラル・エネルギー国際研究所, 助教 (00415952)
• Co-Investigator(Kenkyū-buntansha): YOSHIDA Kenta 名古屋大学, 高等研究院, 助教 (10581118) ; SHAO Huaiyu 九州大学, カーボンニュートラル・エネルギー国際研究所, 助教 (20614697) ; LI Haiwen 九州大学, 水素エネルギー国際研究センター, 准教授 (40400410) ; SASAKI Yukichi ファインセラミックスセンター, ナノ構造解析研究所, グループ長、主席研究員 (40426507) ; AKIBA Etsuo 九州大学, 工学研究院, 教授 (90356345)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 水素吸蔵反応 / その場観察 / 環境制御型TEM

Outline of Final Research Achievements

In situ transmission electron microscopy (TEM) was performed to observe the hydrogenation of Mg-Ni films in a hydrogen atmosphere of 80-100 Pa. An aberration-corrected environmental TEM with a differential pumping system allows us to reveal the Angstrom-scale structure of the films in the initial stage of hydrogenation: first, nucleation and growth of Mg2NiH4 crystals with a lattice spacing of 0.22 nm in an Mg-rich amorphous matrix of the film occurs within 20 seconds after the start of the high-resolution observation, then crystallization of MgH2 with a smaller spacing of 0.15 nm happens after approximately 1 min. Our in situ TEM method is also applicable to the analysis of other hydrogen-related materials.

Free Research Field

材料学、固体化学、電子顕微鏡