Kim, Ji Woo Kim, Kee-Bum Shim, Jae-Hyeok Cho, Young Whan Oh, Kyu Hwan 2024-01-20T08:30:16Z 2024-01-20T08:30:16Z 2021-09-02 2014-12 1431-9276 https://pubs.kist.re.kr/handle/201004/126054 The dehydrogenated microstructure of the lithium borohydride-yttrium hydride (LiBH4-YH3) composite obtained at 350 degrees C under 0.3 MPa of hydrogen and static vacuum was investigated by transmission electron microscopy combined with a focused ion beam technique. The dehydrogenation reaction between LiBH4 and YH3 into LiH and YB4 takes place under 0.3 MPa of hydrogen, which produces YB4 nano-crystallites that are uniformly distributed in the LiH matrix. This microstructural feature seems to be beneficial for rehydrogenation of the dehydrogenation products. On the other hand, the dehydrogenation process is incomplete under static vacuum, leading to the unreacted microstructure, where YH3 and YH2 crystallites are embedded in LiBH4 matrix. High resolution imaging confirmed the presence of crystalline B resulting from the self-decomposition of LiBH4. However, Li2B12H12, which is assumed to be present in the LiBH4 matrix, was not clearly observed. English CAMBRIDGE UNIV PRESS REVERSIBLE HYDROGEN STORAGE BEHAVIOR PRESSURE MGH2 Microstructural Characterization of Dehydrogenated Products of the LiBH4-YH3 Composite Article 10.1017/S1431927614013373 1 MICROSCOPY AND MICROANALYSIS, v.20, no.6, pp.1798 - 1804 MICROSCOPY AND MICROANALYSIS 20 6 1798 1804 scie scopus 000347233400018 2-s2.0-84919431482 Materials Science, Multidisciplinary Microscopy Materials Science Microscopy Article REVERSIBLE HYDROGEN STORAGE BEHAVIOR PRESSURE MGH2 hydrogen storage transmission electron microscopy electron energy loss spectroscopy focused ion beam reactive hydride composite