Characterization of hydrogen absorption/desorption states on lithium-carbon-hydrogen system by neutron diffraction

Journal of Applied Physics 104 巻 5 号 053511- 頁 2008-09 発行
アクセス数 : 1184
ダウンロード数 : 214

今月のアクセス数 : 2
今月のダウンロード数 : 1
ファイル情報(添付)
JApplPhys_104_053511.pdf 113 KB 種類 : 全文
タイトル ( eng )
Characterization of hydrogen absorption/desorption states on lithium-carbon-hydrogen system by neutron diffraction
作成者
Itoh Keiji
Fukunaga Toshiharu
Fuji Hironobu
収録物名
Journal of Applied Physics
104
5
開始ページ 053511
抄録
The nanostructural hydrogenated graphite (CnanoHx) was synthesized from graphite by ball milling under hydrogen (H2) atmosphere. In this product, characteristic hydrogenated states in the form of polarized hydrocarbon groups (―CH, ―CH2, and ―CH3) are realized in the nanoscale. By synthesizing the composite of CnanoHx and lithium hydride (LiH), known as the Li―C―H system, hydrogen was desorbed at 350 °C, which is a lower temperature compared to the decomposition temperature of each component. It is considered that this hydrogen desorption would be induced by destabilization of each hydrogen absorbed state due to an interaction between the polarized C―H groups in CnanoHx and LiH. Therefore, in order to understand the hydrogen absorption/desorption mechanism of the Li―C―H system, it is an important issue to investigate the change in the C―H groups during hydrogen absorption/desorption reactions in the composite. The correlations among atoms contained in this composite are examined by neutron diffraction measurements, where the protium/deuterium (H/D) isotopic substitution was used to clarify the location of hydrogen atoms in this composite. Some C―D and Li―D correlations are found from the radial distribution function [RDF(r)] obtained by the neutron diffraction for the CnanoDx and LiD composite. After dehydrogenation, C―C triple bond and Li―C bond, ascribed to lithium carbide (Li2C2), are observed. Furthermore, the RDF(r) corresponding to rehydrogenated composite indicates the presence of not only the Li―D correlation but also the C―D one.
NDC分類
化学 [ 430 ]
言語
英語
資源タイプ 学術雑誌論文
出版者
American Institute of Physics
発行日 2008-09
権利情報
Copyright 2008 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in J. Appl. Phys. 104, 053511 and may be found at http://dx.doi.org/10.1063/1.2956504.
出版タイプ Version of Record(出版社版。早期公開を含む)
アクセス権 オープンアクセス
収録物識別子
[ISSN] 0021-8979
[NCID] AA00693547
[DOI] 10.1063/1.2956504
[DOI] http://dx.doi.org/10.1063/1.2956504