Hydrogen storage properties of hydrogenated graphite destabilized by mixing with lithium hydride
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- Miyaoka Hiroki
- Department of Quantum Matter, ADSM, Hiroshima University
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- Isobe Shigehito
- Department of Quantum Matter, ADSM, Hiroshima University
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- Ichikawa Takayuki
- Institute for Advanced Materials Research, Hiroshima University
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- Fujii Hironobu
- Institute for Advanced Materials Research, Hiroshima University
Bibliographic Information
- Other Title
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- リチウム水素化物を添加し不安定化処理した水素吸蔵黒鉛の水素貯蔵特性
- リチウム スイソカブツ オ テンカ シ フアンテイカ ショリ シタ スイソ キュウゾウ コクエン ノ スイソ チョゾウ トクセイ
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Abstract
Hydrogen storage properties of the ball-milled mixtures composed of hydrogenated nano-structural graphite (CnanoHx) and lithium hydride (LiH) were examined from thermodynamic and structural points of view, where the CnanoHx was synthesized by ball-milling graphite powder under hydrogen atmosphere. Since hydrogen atoms in the CnanoHx and LiH are strongly bonded with each host atom, heating up to >600°C is necessary to release hydrogen from each solid product. The CnanoHx and LiH composites desorbed hydrogen and hydrocarbon gases below 400°C with about 9.4 mass% weight loss. The 2: 1 composite of the CnanoHx and LiH reversibly stored hydrogen with an effective capacity of about 4.5 mass % at 350°C. No evident peaks were observed in XRD profiles after the dehydrogenation, indicating that the nano-structural feature remained after dehydrogenation due to formation of (CLi) nano clusters. However, only the LiH phase was crystallized after rehydrogenation at 350°C. From these results, it is concluded that hydrogen in the composites is destabilized by a novel interaction between the CnanoHx and LiH in a nanometer scale, and is desorbed at lower temperatures than each of the components. Therefore, this Li-C-H system can be recognized to be a new family of hydrogen storage materials.
Journal
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- TANSO
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TANSO 2007 (226), 2-7, 2007
THE CARBON SOCIETY OF JAPAN
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Keywords
Details 詳細情報について
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- CRID
- 1390282679202542464
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- NII Article ID
- 10018709084
- 130004121533
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- NII Book ID
- AN00140335
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- ISSN
- 18845495
- 03715345
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- HANDLE
- 2115/76325
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- NDL BIB ID
- 8656665
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- Data Source
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- JaLC
- IRDB
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed