Microstructural characterization of dehydrogenated products of the LiBH4-YH3 composite

Title
Microstructural characterization of dehydrogenated products of the LiBH4-YH3 composite
Authors
김지우김기범심재혁조영환오규환
Keywords
Hydrogen storage; Complex metal hydride; LiBH4-YH3; Microstructure; Dehydrogenation; Transmission electron microscopy; YB4; electron energy loss spectroscopy; focused ion beam; reactive hydride composite
Issue Date
2014-12
Publisher
Microscopy and Microanalysis
Citation
VOL 20, NO 6, 1798-1804
Abstract
The dehydrogenated microstructure of the lithium borohydride-yttrium hydride (LiBH4-YH3) composite obtained at 350°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.
URI
http://pubs.kist.re.kr/handle/201004/49192
ISSN
14319276
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KIST Publication > Article
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