Decrease of hydrogen desorption temperature of metal hydride through elastic constraints by surface oxide

通过表面氧化物的弹性约束降低金属氢化物的氢解吸温度

• 批准号: 24760588
• 负责人: MATSUMOTO Itoko
• 金额: $ 2.66万
• 依托单位: National Institute of Advanced Industrial Science and Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2012
• 资助国家: 日本
• 起止时间: 2012-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-24760588/
• 关键词: 水素貯蔵材料; マグネシウム; 薄膜; 水素吸蔵材料; 走査型プローブ顕微鏡; ナノ構造

Magnesium hydride (MgH2) has attracted great attention as a hydrogen storage material because of its high hydrogen density of 7.6 mass%. However, its hydrogen absorption and desorption is too slow and the absorption and desorption temperature is too high for practical applications. Recently, Mg thin film capped with a metallic layer was reported to absorbed hydrogen at relatively moderate temperature. The hydrogen absorption temperature of Mg film depends on the Mg layer thickness and the surface layer thickness. This phenomena was interpreted as effects of the elastic clamping of the surface layer, which inhibits volume expansion of the Mg layer during hydrogen absorption. The elastic constraints theory is expected to be applicable to MgH2 or Mg with a surface layer of oxide. Therefore, in this study, effect of surface oxidation on of Mg thin film and MgH2 fiber on their hydrogen storage properties were investigated.

氢化镁（MgH2）由于其7.6质量%的高氢密度而作为储氢材料受到极大关注。但是，其吸放氢速度太慢，吸放氢温度太高，不适合实际应用。最近，有报道称，在Mg薄膜上覆盖一层金属层，可以在相对温和的温度下吸收氢。Mg膜的吸氢温度取决于Mg层厚度和表面层厚度。这种现象被解释为表面层的弹性夹紧的效果，这抑制了吸氢过程中的Mg层的体积膨胀。弹性约束理论可望适用于MgH2或表面有氧化层的Mg。因此，本研究主要探讨表面氧化对镁薄膜及镁纤维储氢性能的影响。

项目成果

Hydrogen Absorption and Desorption Property of Magnesium Fiber Prepared by Vapor Deposition

气相沉积镁纤维的吸放氢性能

• 发表时间: 2012
• 作者: I. Matsumoto;K. Asano;K. Sakaki;Y. Nakamura
• 通讯作者: Y. Nakamura

Hydrogen Absorption and Desorption Property of MgH2 Fiber Prepared by Vapor Deposition

气相沉积法制备MgH2纤维的吸放氢性能

• 发表时间: 2013
• 作者: I. Matsumoto;K. Asano;K. Sakaki;Y. Nakamura
• 通讯作者: Y. Nakamura