Mechanically Milling with Off-the-Shelf Magnesium Powder to Promote Hydrogen Release from Ammonia Borane
Mechanically Milling with Off-the-Shelf Magnesium Powder to Promote Hydrogen Release from Ammonia Borane
复制标题
用现成的镁粉进行机械研磨以促进氨硼烷中的氢释放
DOI：
10.1021/jp911931t
复制
发表时间：
2010-05
影响因子：
3.7
通讯作者：
Kang, Xiang-Dong
中科院分区：
文献类型：
--
作者：
Wang, Ping;Luo, Jun-Hong;Kang, Xiang-Dong
Mechanically milling with the off-the-shelf magnesium (Mg) powder can dramatically improve the dehydrogenation properties of ammonia borane (AB) on all key aspects: enhancing the dehydrogenation kinetics, reducing the induction period, suppressing the formation of volatile byproduct, and alleviating the sample foaming. The postmilled AB/0.5Mg sample can release 8.2 wt % of hydrogen at 100 °C within 4 h and deliver >2.5 equiv of hydrogen in AB upon elevating the dehydrogenation temperature to 300 °C, giving a material-based hydrogen capacity of 12 wt %. Additionally, the dehydrogenation reaction of the AB/0.5Mg sample becomes significantly less exothermic than that of pristine AB, and remarkably, the third dehydrogenation step is tailored to be endothermic. Combination of phase/structure/chemical state analyses suggest that a considerable amount of Mg participates in the dehydrogenation process, resulting in the formation of Mg−N−B−H product(s).
