Promotion of Hydrogen Release from Ammonia Borane with Mechanically Activated Hexagonal Boron Nitride
Promotion of Hydrogen Release from Ammonia Borane with Mechanically Activated Hexagonal Boron Nitride
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DOI：
10.1021/jp8087385
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发表时间：
2009-01
影响因子：
3.7
通讯作者：
D. Neiner;A. Karkamkar;J. Linehan;B. Arey;T. Autrey;S. Kauzlarich
中科院分区：
文献类型：
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作者：
D. Neiner;A. Karkamkar;J. Linehan;B. Arey;T. Autrey;S. Kauzlarich
纳米级六方BN添加剂氨硼烷，AB，示出降低氢释放的起始温度。采用球磨法制备了纳米BN和AB：纳米BN样品。通过X射线粉末衍射、11 B核磁共振、热重分析、差示扫描量热法和质谱对材料进行了表征，并通过体积气体滴定管系统测量了氢释放。与纯AB相比，AB：纳米BN的混合物的几种效果被示出是有益的。随着纳米BN含量的增加，脱氢温度降低，NH3生成量减少，放氢速率降低。
Nanoscale hexagonal BN additive for ammonia borane, AB, is shown to decrease the onset temperature for hydrogen release. Both the nano-BN and the AB:nano-BN samples are prepared by ball milling. The materials are characterized by X-ray powder diffraction, 11B muclear magnetic resonance, thermogravimetric analysis, differential scanning calorimetry, and mass spectrometry, and the hydrogen release is measured by a volumetric gas burette system. Several effects of the mixtures of AB:nano-BN are shown to be beneficial in comparison with neat AB. These are the decrease of the dehydrogenation temperature, the decrease in NH3 formation, as well as the decrease of the exothermicity of hydrogen release with increasing the nano-BN concentration.