Noncrystalline structure of Ni-P nanoparticles prepared by liquid pulse discharge.
Noncrystalline structure of Ni-P nanoparticles prepared by liquid pulse discharge.
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DOI：
10.1107/s1600577514025703
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发表时间：
2015-03
影响因子：
2.5
通讯作者：
Yuanyuan Tan;Hongying Yu;Zhonghua Wu;Bin Yang;Yu Gong;Shi Yan;R. Du;Zhongjun Chen;Dong-bai Sun
中科院分区：
文献类型：
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作者：
Yuanyuan Tan;Hongying Yu;Zhonghua Wu;Bin Yang;Yu Gong;Shi Yan;R. Du;Zhongjun Chen;Dong-bai Sun
非晶态磷化镍（Ni-P）纳米粒子因其作为催化剂的潜力而受到广泛关注。然而，非晶态Ni-P纳米颗粒的结构仍然是未知的，这可能有助于解释Ni-P纳米颗粒的催化机理。本文合成了非晶态Ni-P纳米粒子。研究了它们的形貌、粒径、元素含量、局部原子结构以及对高氯酸铵热分解的催化作用。结果表明，所制备的Ni-P纳米粒子为球形，平均粒径约为13.5nm。Ni和P的含量分别为78.15%和21.85%。所制备的Ni-P纳米颗粒的非结晶性质可以归因于P掺杂f.c.c.-如Ni中心和Ni 3 P类P中心。局部有序的Ni心和P心是形核位置，可以很好地解释高温退火后初始形核形成晶相的原因。发现非晶态Ni-P纳米颗粒的存在显著降低了高氯酸铵的高温分解起始温度。因此，所制备的非晶态Ni-P纳米粒子可作为高氯酸铵热分解的潜在催化剂。
Noncrystalline nickel phosphide (Ni-P) nanoparticles have drawn great attention due to their high potential as catalysts. However, the structure of noncrystalline Ni-P nanoparticles is still unknown, which may shed light on explaining the catalysis mechanism of the Ni-P nanoparticles. In this paper, noncrystalline Ni-P nanoparticles were synthesized. Their morphology, particle size, element contents, local atomic structures, as well as the catalysis in the thermal decomposition of ammonium perchlorate were studied. The results demonstrate that the as-prepared Ni-P nanoparticles are spherical with an average diameter of about 13.5 nm. The Ni and P contents are, respectively, 78.15% and 21.85%. The noncrystalline nature of the as-prepared Ni-P nanoparticles can be attributed to cross-linkage between P-doping f.c.c.-like Ni centers and Ni3P-like P centers. The locally ordered Ni centers and P centers are the nuclei sites, which can explain well the origin of initial nuclei to form the crystalline phases after high-temperature annealing. The starting temperature of high-temperature decomposition of ammonium perchlorate was found having a significant decrease in the presence of the noncrystalline Ni-P nanoparticles. Therefore, the as-prepared noncrystalline Ni-P nanoparticles can be used as a potential catalyst in the thermal decomposition of ammonium perchlorate.