Kim, Ji Woo Ahn, Jae-Pyoung Jin, Seon-Ah Lee, Sang Hoon Chung, Hee-Suk Shim, Jae-Hyeok Cho, Young Whan Oh, Kyu Hwan 2024-01-20T23:33:34Z 2024-01-20T23:33:34Z 2021-09-03 2008-03-15 0378-7753 https://pubs.kist.re.kr/handle/201004/133650 The microstructure of MgH(2) with 1 mol% NbF(5), Prepared by high-energy ball milling (HEBM), was studied using high resolution transmission electron microscopy (HR-TEM) with an X-ray energy dispersive spectrometer (EDS) before and after hydrogen sorption cycles. The TEM samples were prepared without any air exposure by a novel, focused ion beam (FIB) system specially designed for highly air sensitive materials. During HEBM, the doping agent, NbF5, was distributed as an extremely thin, film-like, amorphous phase along the grain boundaries of the nanocrystalline MgH2. After 10 sorption cycles, amorphous Nb-F phase was transformed into crystalline Nb hydrides. It is believed that the Nb hydride played a decisive role in improving the sorption kinetics of MgH(2). (C) 2007 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE BV H-SORPTION SODIUM ALANATE METAL-HYDRIDES TI NANOCOMPOSITES NANOPARTICLES IMPROVEMENT POWDERS NAALH4 FE Microstructural evolution of NbF(5)-doped MgH(2) exhibiting fast hydrogen sorption kinetics Article 10.1016/j.jpowsour.2007.12.005 1 JOURNAL OF POWER SOURCES, v.178, no.1, pp.373 - 378 JOURNAL OF POWER SOURCES 178 1 373 378 scie scopus 000254215000045 2-s2.0-39149095609 Chemistry, Physical Electrochemistry Energy & Fuels Materials Science, Multidisciplinary Chemistry Electrochemistry Energy & Fuels Materials Science Article H-SORPTION SODIUM ALANATE METAL-HYDRIDES TI NANOCOMPOSITES NANOPARTICLES IMPROVEMENT POWDERS NAALH4 FE hydrogen storage hydrides transmission electron microscopy focused ion beam catalysts