Ni nanoparticles supported on carbon as efficient catalysts for the hydrolysis of ammonia borane
Ni nanoparticles supported on carbon as efficient catalysts for the hydrolysis of ammonia borane
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碳载镍纳米粒子作为氨硼烷水解的有效催化剂
DOI：
10.1007/s12274-014-0438-7
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发表时间：
2014-04
期刊：
影响因子：
--
通讯作者：
chen jun
中科院分区：
文献类型：
--
作者：
zhou limin;zhang tianran;tao zhanliang;chen jun
本文报道了三种碳载镍纳米粒子（Ni/C）的制备及其在氨硼烷（AB）水解反应中的应用。三种Ni/C催化剂由Ni金属-有机骨架（Ni-MOF）前体通过用KBH 4还原、在Ar下在700 °C下煅烧以及煅烧和还原的组合来制备，产物分别表示为Ni/C-1、Ni/C-2和Ni/C-3。采用X射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、氮吸附-脱附测试和X射线光电子能谱（XPS）等手段对样品的结构、形貌、比表面积和元素价态进行了表征。结果表明，Ni/C-1是由非晶态Ni颗粒团聚在碳上形成的，Ni/C-2是由晶态Ni颗粒（约10 nm）负载在碳上形成的，且Ni颗粒表面氧化，而Ni/C-3中Ni颗粒表面氧化程度较低。Ni-MOF、Ni/C-1、Ni/C-2和Ni/C-3的比表面积分别为1239、33、470和451 m2·g-1。Ni/C-3催化AB水解的产氢速率为834 mL·min-1·g-1，活化能为31.6 kJ/mol。Ni/C-3催化剂的催化活性高于其他材料，这与其具有较大的比表面积有关。该研究为在常温下用Ni纳米粒子代替贵金属进行AB水解提供了一种很有前途的方法。
We report on the preparation of three kinds of Ni nanoparticles supported on carbon (Ni/C) and their application in the catalytic hydrolysis of ammonia borane (AB). Three Ni/C catalysts were prepared from a Ni metal-organic framework (Ni-MOF) precursor by reduction with KBH4, calcination at 700 °C under Ar, and a combination of calcination and reduction, the products being denoted as Ni/C-1, Ni/C-2, and Ni/C-3, respectively. The structure, morphology, specific surface area, and element valence were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption-desorption measurements, and X-ray photoelectron spectra (XPS). The results demonstrate that Ni/C-1 is composed of amorphous Ni particles agglomerated on carbon, Ni/C-2 is characteristic of crystalline Ni nanoparticles (about 10 nm in size) supported on carbon with Ni oxidized on the surface, while the surface of the Ni particles in Ni/C-3 is less oxidized. The specific surface areas of Ni-MOF, Ni/C-1, Ni/C-2, and Ni/C-3 are 1239, 33, 470, and 451 m2·g−1, respectively. The catalytic hydrolysis of AB with Ni/C-3 shows a hydrogen generation rate of 834 mL·min−1·g−1at room temperature and an activation energy of 31.6 kJ/mol. Ni/C-3 shows higher catalytic activity than other materials, which can be attributed to its larger surface area of crystalline Ni. This study offers a promising way to replace noble metal by Ni nanoparticles for AB hydrolysis under ambient conditions.
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影响因子：
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DOI：
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