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

• 宮岡 裕樹

  広島大学大学院先端物質科学研究科

• 礒部 繁人

  広島大学大学院先端物質科学研究科

• 市川 貴之

  広島大学先進機能物質研究センター(IAMR)

• 藤井 博信

  広島大学先進機能物質研究センター(IAMR)

書誌事項

タイトル別名

• Hydrogen storage properties of hydrogenated graphite destabilized by mixing with lithium hydride
• 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

抄録

Hydrogen storage properties of the ball-milled mixtures composed of hydrogenated nano-structural graphite (C^nanoH_x) and lithium hydride (LiH) were examined from thermodynamic and structural points of view, where the C^nanoH_x was synthesized by ball-milling graphite powder under hydrogen atmosphere. Since hydrogen atoms in the C^nanoH_x and LiH are strongly bonded with each host atom, heating up to >600°C is necessary to release hydrogen from each solid product. The C^nanoH_x and LiH composites desorbed hydrogen and hydrocarbon gases below 400°C with about 9.4 mass% weight loss. The 2: 1 composite of the C^nanoH_x 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 C^nanoH_x 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.

収録刊行物

• 炭素

  炭素 2007 (226), 2-7, 2007

  炭素材料学会

キーワード

• Hydrogen storage material
• Graphite
• Nano-structure
• Mechancal milling
• Gas desorption properties

詳細情報

• CRID: 1390282679202542464
• NII論文ID: 10018709084
• NII論文ID: 130004121533
• NII書誌ID: AN00140335
• DOI: 10.7209/tanso.2007.2
• ISSN: 18845495
• ISSN: 03715345
• HANDLE: 2115/76325
• NDL書誌ID: 8656665
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I8656665
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