Fundamental investigation of de/rehydrogenation of metal borhydrides-mechanistic clarification and performance improvement

金属硼氢化物脱/再氢化的基础研究-机理澄清和性能改进

• 批准号: 23760658
• 负责人: LI Haiwen
• 金额: $ 2.41万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23760658/
• 关键词: 水素; 水素化物; 錯体系水素化物; 水素貯蔵; 中間相; 錯体水素化物

Mechanistic clarification and performance improvement of de/rehydrogenation of metal borohydrides with a focus on intermediates have been systematically investigated. The formation of polyatomic anion [B12H12]2-from [BH4]-was found to occur via the gradual evolution of the B-H anion, such as [BH4]-→ [B2H6]2-→[B5H9]2-→ [B12H12]2-. Dehydrogenation of reactive composite hydrides 2LiBH4 + MgH2largely depends on the hydrogen pressure and the formation of intermediate Li2B12H12 was found to form only at pressures lower than 1.0 MPa. The different boron-related species between the dehydrogenated Mg(BH4)2 and Ca(BH4)2 would afford different rehydrogenation performance, i.e. Ca(BH4)2 showed better rehydrogenation than Mg(BH4)2.In conclusion, controlling of the formation of intermediates during the dehydrogenation of metal borohydrides would be of great importance for substantial improvement of hydrogen storage properties.

系统地研究了金属硼氢化物脱氢/再加氢的机理澄清和性能改进，重点研究了中间体。由[BH4]-形成的多原子阴离子[B12H12]2-是通过[BH4]-→[B2H6]2-→[B5H9]2-→[B12H12]2-等B-H阴离子的逐渐演化而形成的。反应性复合氢化物2LiBH4+MgH_2的脱氢反应很大程度上依赖于氢气压力，而中间产物Li2B_(12)H_(12)的形成只有在压力低于1.0 Mpa时才能形成。脱氢后的Mg(BH4)2和Ca(BH4)2中不同的含硼物种具有不同的再加氢性能，即Ca(BH4)2的再加氢性能优于Mg(BH4)2。因此，在金属硼氢化物脱氢过程中控制中间产物的生成对大幅度提高金属硼氢化物的储氢性能具有重要意义。

项目成果

Hydrogenation properties of nanostructured MgB2

纳米结构MgB2的加氢性能

• 发表时间: 2012
• 作者: H.-W. Li;T. Matsunaga;Y. Yan;H. Maekawa;E. Akiba;S. Orimo
• 通讯作者: S. Orimo

Hydrogen Pressure Dependence of Li2B12H12 Formation during Dehydrogenation of LiBH4-MgH2Composite

LiBH4-MgH2复合材料脱氢过程中Li2B12H12形成的氢压依赖性

• 发表时间: 2012
• 作者: H.-W. Li;Y. Yan;H. Maekawa;E. Akiba;S. Orimo
• 通讯作者: S. Orimo

Hydrogenation Properties of Layered Structured Metal Diboride MB2

层状结构金属二硼化物MB2的加氢性能

• 发表时间: 2012
• 作者: H.-W. Li;T. Matsunaga;Y. Yan;H. Maekawa;E. Akiba;S. Orimo
• 通讯作者: S. Orimo

Crystal Structure Analysis of Mg(BH4)(NH2)

Mg(BH4)(NH2)晶体结构分析

• 发表时间: 2012
• 作者: T. Noritake;K. Miwa;M. Aoki;M. Matsumoto;S. Towata;H.-W. Li;S. Orimo
• 通讯作者: S. Orimo

Dehydrogenation properties and crystal structure analysis of Mg(BH4)(NH2)

• DOI: 10.1016/j.jallcom.2013.03.081
• 发表时间: 2013-12
• 期刊: Journal of Alloys and Compounds
• 影响因子: 6.2
• 作者: T. Noritake;K. Miwa;M. Aoki;Mitsuru Matsumoto;S. Towata;Haiwen Li;S. Orimo